1059

1059 Datasheet

Shenzhen, China No. 2 Building, 2nd Industry Park Tangxiayong Songgang Town Baoan District, Shenzhen City Guangdong Province China 518105 Phone Fax

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global solutions local support Microwave Absorbing Materials NORTH AMERICA EUROPE Our USA toll-free telephone number Chicago, USA 1751 Wilkening Court Schaumburg, IL 60173 Phone Fax Delaware Water Gap, USA Shielding Way P.O. Box 650 Delaware Water Gap, PA 18327 Phone Fax Reynosa, Mexico Industrial Center #5 Parque Industrial Reynosa Calle Brecha E-99 NORTE Lote 23, Reynosa Tamaulipas 88780 Phone +52-899-921-9000 Fax +52-899-921-9038 San Diego, USA 1825 Diamond Street San Marcos, CA 92069 Phone Fax Czech Republic Prumyslova 497 462 11 Liberec Czech Republic Phone Fax Germany AuBere OberaustraBe 22 83026 Rosenheim, Germany Phone Fax France 13-15 rue des Entrepreneurs 91560 Crosne, France Phone Fax United Kingdom Birches Industrial Estate East Grinstead West Sussex RH19 1XH UK Phone Fax San Jose, USA 2030 Fortune Drive Suite 100 San Jose, CA 95131 Phone Fax St. Louis, USA 3481 Rider Trail South St. Louis, MO 63045 Phone Fax ASIA Kunshan, China 28 Huanghe South Road Kunshan Economical & Technical Development Zone Kunshan City, China Phone Fax Seoul, Korea A-4th Floor, Woorim Lion's Valley 371-28,Gasan-Dong, Gumcheon-Gu, Seoul 153-786 Korea Phone Fax: Tianjin, China Building C3/C4, Hongtai Industrial Park No. 87 TaiFeng Road, TEDA Tianjin, PRC 300457 Phone Fax Tokyo, Japan Shin Yokohama Business Center Building 7F 2-6, Shin Yokohama 3-chome, Kohoku-ku Yokohama-shi, Kanagawa 222-0033, Japan Phone Fax Shanghai, China Building 1, Number 58 Hua Ning Road, Lane 4018 Shanghai, P.R. China 201108 Phone Fax Yokohama, Japan 2-12-8 Sachiura, Kanazawa-ku Yokohama-shi, 236-0003, Japan Phone Fax Shenzhen, China No. 2 Building, 2nd Industry Park Tangxiayong Songgang Town Baoan District, Shenzhen City Guangdong Province China 518105 Phone Fax Singapore 750E Chai Chee Road #03-07/08 Chee Singapore 469005 Phone Fax Suzhou, China No. 228 Tongyuan Road Suzhou Industry Park Suzhou, P.R.China 215006 Phone Fax Taiwan 4F, No. 6 Hou-Sheng Road Luchu, Taoyuan, Taiwan 338 Phone Fax NOTICE Although the information and recommendations set forth herein hereinafter "information" are presented in good faith and believed to be correct as of the date hereof, Laird Technologies makes no representation or warranties as to the completeness or accuracy thereof. Information is supplied upon the condition that the persons receiving same will make their own determination as to its suitability for their purposes prior to use. In no event will Laird Technologies be responsible for damages of any nature whatsoever resulting from the use or reliance upon information or the product to which information refers. Nothing contained herein is to be construed as a recommendation to use any product, process, equipment or formulation in conflict with any patent, and Laird Technologies makes no representation or warranty, expressed or implied, that the use thereof will not infringe any patent. The data set forth in all tables, charts, graphs and figures herein are based on samples tested and are not guaranteed for all samples or applications. Such data are intended as guides and do not reflect product specifications for any particular product. NO REPRESENTATION OR WARRANTIES, EITHER EXPRESSED OR IMPLIED, OR MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OF ANY OTHER NATURE ARE MADE HEREUNDER WITH RESPECT TO INFORMATION OR THE PRODUCT TO WHICH INFORMATION REFERS. ABSORB-CAT-2006 global solutions : local support Visit for more information on Laird Technologies engineered EMI, antenna and thermal interface product lines. Laird Technologies is committed to providing the world's leading OEMs with comprehensive solutions for their antenna, EMI shielding, telematics and thermal management requirements. A world-leader, Laird Technologies has unrivaled product lines, dedication to ongoing R&D and a seamless network of manufacturing and customer support facilities located across the globe - most importantly, near its customers. The company's philosophy of 'global solutions and local support' coupled with decades of experience and considerable capabilities means it has become a key partner for OEMs manufacturing in the following industries: Aerospace Automotive electronics Computer Data communications General electronics Medical equipment Military Network equipment Telecommunications global solutions local support table of contents # Part Number Cross rfeference. 2 Introduction to Microwave Absorbers Principles of Operation. 3 Resonant Absorbers. 3 Graded-Dielectric Absorbers. 4 Material Selection. 5 Electrical Performance Guidelines. 5 Physical Performance Guidelines. 5 Absorber Types. 5 Applications Military, Commercial . 6 Microwave Absorbing Elastomers Q-Zorb RFSB - Single Band Absorbers. 7 Q-Zorb RFSW - Surface Wave Absorbers 9 Specialty Microwave Absorbers RFHC - Treated Honeycomb Core Absorbers 16 RFSS - Salisbury Screens. 17 Microwave Absorbing Textile Covers. 18 Custom Magnetic Absorbers Thermoplastic Extruding. 19 Liquid Resin Systems 19 Extruded Elastomers. 19 When ordering, please call our sales department to availability and lead times. Part No. 1000-2999 1000-1999 2000-2999 4000-4999 4000-4299 4300-4399 4500-4599 4700-4799 5000-5999 5000-5299 5300-5599 6000-6999 6000-6799 6800-6999 Product MICROWAVE ABSORBING ELASTOMERS Q-ZORB SINGLE BAND ABSORBERS Q-ZORB SURFACE WAVE ABSORBERS RETICULATED FOAM MICROWAVE ABSORBERS GRADED RETICULATED FOAM ABSORBERS UNIFORM RETICULATED FOAM ABSORBERS CONVOLUTED RETICULATED FOAM ABSORBERS RIGID RETICULATED FOAM ABSORBERS OPEN-CELL FOAM ABSORBERS SINGLE LAYER "LOSSY" ABSORBERS MULTILAYER "LOSSY" ABSORBERS LIGHTWEIGHT ABSORBERS HONEYCOMB ABSORBERS SALISBURY SCREEN ABSORBERS Page No. 12 15 13 14 16 17 Introduction to Microwave Absorbers Interest in microwave-absorbing material technology has been growing. As the name implies, microwave-absorbing materials are coatings whose electrical and/or magnetic properties have been altered to allow absorption of microwave energy at discrete or broadband frequencies. There are several techniques to achieve these properties. The goal of the absorber manufacturer is to balance electrical performance, thickness, weight, mechanical properties and cost. Principles of Operation Altering the dielectric and magnetic properties of existing materials will produce microwave absorbers. For purposes of analysis, the dielectric properties of a material are categorized as its permittivity and the magnetic properties as its permeability. Both are complex numbers with real and imaginary parts. Common dielectric materials used for absorbers, such as foams, plastics and elastomers, have no magnetic properties, giving them permeability of Magnetic materials, such as ferrites, iron and cobalt-nickel alloys, are used to alter the permeability of the base materials. High dielectric materials, such as carbon, graphite and metal flakes, are used to modify the dielectric properties. When an electromagnetic wave, propagating through a free-space impedance of Z0, is incident upon a semi-infinite dielectric or magnetic dielectric boundary of impedance Z1, a partial reflection occurs. The magnitude of the reflection coefficient is governed by the following equation: Figure Mutual Cancellation of Reflected and Emergent Waves Incident Wave Total Emergent Wave = - e1 + e2 + e3 etc. d Quarter Wave Layer Metal Reflector Resonant absorber showing out-of-phase condition existing between reflected and emergent waves. R = 1 Z1/Z0 1 + Z1/Z0 Where u0 e0 u1 e1 To achieve a reflection coefficient of zero Z0 = Z1. This condition is achieved when: u1 e1 u0 e0 The perfect absorber would therefore have u1 to e1 and be as large as possible to achieve absorption in the thinnest layer possible. Unfortunately, at microwave frequencies, u1 generally does not approach the magnitude of e1. However, other techniques can be used for microwave absorption. In general, practical microwave absorbers are one of two basic types resonant or graded dielectric. Resonant Absorbers The simplest type of resonant absorber is the Salisbury Screen. It consists of a resistive sheet spaced one-quarter wavelength from a conductive ground plane. The resistive sheet is as thin as possible with a resistance of 377 ohms per square matching that of free space. Figure 1 illustrates its operation. A wave incident upon the surface of the screen is partially reflected and partially transmitted. The transmitted portion undergoes multiple internal reflections to give rise to a series of emergent waves. At the design frequency, the sum of the emergent waves is equal in amplitude to, by 180o out of phase with, the initial reflected portion. In theory, zero reflection takes place at the frequency in practice, absorption of greater than 30dB may be achieved see Figure Figure Loss dB RFSS-10 P/N 6852 8 10 12 14 16 18 Frequency GHz Salisbury Screen resonant absorber at 10GHz. Introduction to Microwave Absorbers The inherent problems of the Salisbury Screen are poor flexibility, poor environmental resistance and increased thickness, especially at lower frequencies. Distributing dielectric and/or magnetic fillers into a flexible matrix, such as an elastomer, can produce a more practical absorber. Increasing the permeability and permittivity of the layer increases the refractive index ue, thus decreasing thickness by the relations 1/ ue. The dramatic difference in thickness achievable can be illustrated by comparing two microwave absorbers. RFSS-10 is a Salisbury Screen-type absorber tuned to 10GHz and is nominally 6,4 mm thick. RFSB-10 is an elastomer loaded with carbonyl iron filler and is 1,7 mm thick. The same electrical performance can be achieved in a material that is 25% as thick although a weight penalty must be paid . The RFSB absorber is also very flexible and adaptable to outdoor environments. Resonant materials can also be produced to absorb at multiple frequencies. By controlling the critical magnetic/dielectric loading and thickness of each layer, two discrete frequencies can be tuned. These flexible dual-band absorbers are standard production products and have the added advantage of broadband absorption. For example, a dual-band absorber with appropriate resonant points will have greater than 15dB absorption over an octave bandwidth see Figure Figure Graded-Dielectric Absorbers The other absorber category is the graded-dielectric absorber. Its principle of operation is quite different from that of the resonant type. Absorption is achieved by a gradual tapering of impedance from that of free space to a highly "lossy" state. If this transition is done smoothly, little reflection from the front face will result. Anechoic chamber materials accomplish this via the pyramidal shape of the absorber see Figure The absorbing medium is a conductive carbon in polyurethane foam. Absorption levels of greater than 50dB can be obtained with pyramids many wavelengths thick. These are impractical for electromagnetic interference EMI or radar cross-section RCS reduction. Good levels of reflectivity reduction greater than 20dB can be achieved in materials less than 1/3 wavelength thick. In this case, a very open-celled 10 pores per inch foam is used. A gradual transition is achieved via a conductive carbon coating. Figure 5 depicts typical performance where reflectivity levels of -20dB are achieved from 4 to 18GHz and above at a thickness of 31,8 mm . Ordering Information Select the desired frequency of operation listed in ascending order from Table This selection will govern dB loss and thickness. Then choose the material type and other options including flame retardant FR , pressure-sensitive adhesive PSA , ground plane GP , or iron silicide FeSi and select a part number. Material Types Available FS - Fluorosilicone H - N - Nitrile R- Natural Rubber S- Silicone U - Urethane V - Viton W - Neoprene 1122 1019 1065 1048 1039 1049 1031 1007 1236 1027 1125 1124 1060 1059 1267 1084 1083 1044 1043 1042 1040 1167 1101 1086 1085 1071 1070 1268 1104 1126 1073 1016 1164 1062 1061 1088 1087 1008 1105 1021 1056 1269 1106 1033 1032 1080 1079 1107 1270 1057 MATERIAL TYPE R N R N R N S N R S N S N R S N R S N R S R N S N S N FREQ GHZ DB LOSS THICKNESS IN MM 6,4,2 3,8 3,8 3,6 3,4 3,4 3,4 2,7 2,9 2,9 2,5 2,5 2,7 2,9 2,9 2,7 2,7 2,4 2,4 2,0 2,4 2,8 2,8 2,4 2,4 2,4 2,4 2,4 2,4 1,9 2,1 2,1 2,1 2,2,2,0 1,9 1,9 2,2 1,8 1,9 1,9 1,9 1,7 1,7 1,8 1,8 1,8 OTHER PSA GP PSA GP PSA GP PSA 1090 1089 1137 1130 1034 1005 1271 1017 1118 1013 1068 1078 1077 1025 1092 1091 1259 1018 1024 1063 1109 1009 1029 1023 1115 1161 1006 1110 1094 1093 1067 1168 1022 1010 1096 1097 1160 1045 1111 1272 1014 1038 1112 1116 1015 1117 1273 1132 1274 MATERIAL TYPE N S N S N S N S N S N S R S R S N S N R N S N S R S R S N S TYPE FREQ GHZ DB LOSS All dimensions shown are in inches millimeters unless otherwise specified. THICKNESS IN MM 1,8 1,8 2,3 1,8 1,7 1,7 1,7 1,6 1,6 1,6 1,5 1,6 1,6 1,5 1,5 1,5 1,5 1,5 1,7 1,7 1,4 1,4 1,4 1,4 1,3 1,3 1,5 1,3 1,3 1,3 1,1,1,3 1,4 1,1,1,0,9 1,0 1,1,0 1,0,9 0,9 0,9 1,1 0,9 0,9 0,8 OTHER GP PSA GP-PSA GP PSA GP-PSA GP PSA PSA GP PSA GP PSA Microwave Absorbing Elastomers RFSW - Surface Wave Absorbers Q-Zorb RFSW surface wave absorbers are thin, magnetically loaded elastomeric sheets designed to provide attenuation at high angles of incidence for surface wave attenuation. They are nominally manufactured in the thickness range of to 0,4 mm to 3,2 mm . They are elastomer-based with a variety of choices available. For example, silicone is chosen for high-temperature applications, nitrile for fuel and oil resistance and natural rubber for commercial applications. Several magnetic fillers are available carbonyl iron powder is standard, but other materials such as iron silicide FeSi are used for corrosionresistant applications. The materials are available in UL fire retardant versions for use in commercial devices. Laird Technologies can provide the material die-cut and with a pressure-sensitive adhesive for ease of installations. Sheets are offered in nominal sizes of 24" x 24" 609,6 mm x 609,6 mm , although custom sizes and molded components are available. Applications The material can be used inside of microwave housings to reduce internal resonance and to lower the "Q" of the microwave cavity. They are also effective in isolating antennas from ground plane reflections. Q-Zorb can be used with board level shielding and other types of EMI shielding to enhance the shielding effectiveness at frequencies from 2-40GHz. Figure Loss dB Q-Zorb Surface Wave mm Thick P/N 2016 10 12 14 16 18 -35 Frequency GHz Figure Loss dB Q-Zorb Surface Wave mm Thick P/N 2240 10 12 14 16 18 -35 Frequency GHz Figure Loss dB Q-Zorb Surface Wave mm Thick P/N 2238 8 10 12 14 16 18 -35 Frequency GHz Ordering Information Select desired frequency of operation listed in ascending order from Table 1 on the next page. This selection will govern dB loss and thickness. Then choose material type and other options including flame retardant FR , pressuresensitive adhesive PSA , ground plane GP , or iron silicide FeSi and select a part number. Material Types Available FS - Fluorosilicone H - N - Nitrile R - Natural Rubber S - Silicone U - Urethane V - W - Neoprene Table 1 RFSW - Surface Wave Absorber Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance. 2000 - 2999 RFSW - SURFACE WAVE ABSORBERS 2138 2130 2062 2178 2049 2247 2032 2222 2129 2171 2170 2016 2196 2142 2242 2264 2162 2161 2041 2044 2258 2021 2220 2094 2272 2230 2167 2034 2190 2068 2087 2042 2002 2123 2122 2023 2095 2257 2256 2141 2231 2248 2047 2225 2266 2265 2080 2082 2081 2097 2005 2039 2147 MATERIAL TYPE S N R S N R S N R N R S N R S R N R S N R N R N THICKNESS IN MM 4,7 4,6 4,6 4,6 4,4,4,3,5 3,2 3,2 3,2 3,2 3,2 3,2 3,2 3,2,9 2,9 2,8 2,8 2,8 2,5 2,5 2,5 2,5 2,5 2,4 2,4 2,4 2,3 2,3 2,2,2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 1,9 1,9 1,8 1,8 1,8 1,7 1,7 1,7 1,7 1,6 1,5 1,5 OPT. FREQ. RANGE GHZ * <2 <2 <2 <2 <2 <2 <2 <2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8-12 8-12 8-12 8-12 8-12 8-12 8-12 OTHER PSA GP PSA FR-PSA PSA FR-PSA PSA FR-PSA FR PSA PSA GP-PSA GP PSA 2038 2263 2261 2240 2239 2221 2134 2133 2113 2169 2056 2296 2057 2093 2105 2153 2168 2143 2099 2031 2146 2218 2238 2237 2270 2028 2252 2251 2204 2260 2045 2191 2181 2151 2152 2236 2235 2046 2144 2119 2140 2078 2136 2053 2201 2112 2120 2234 2233 2075 2966 2963 2960 MATERIAL TYPE R S R N s N R S N R S N S N R S R S N S N R S THICKNESS IN MM 1,5 1,5 1,5 1,5 1,5 1,5 1,4 1,4 1,3 1,3 1,3 1,3 1,3 1,1,1,1,1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0,9 0,9 0,9 0,9 0,8 0,8 0,8 0,8 0,8 0,8 0,8 0,8 0,7 0,7 0,6 0,6 0,6 0,6 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,4 0,3 0,3 OPT. FREQ RANGE GHZ " 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 OTHER PSA PSA FR-PSA PSA FR-PSA GP-PSA PSA FR-PSA GP FR-PSA FR PSA PSA GP PSA FR-PSA PSA FR-PSA * Adequate surface wave performance may be achieved by using thinner materials. Consult Laird Technologies applications engineers for assistance. All dimensions shown are in inches millimeters unless otherwise specified. Microwave Absorbing Foam RFRET - Reticulated Foam Absorbers RFRET is a reticulated foam absorber. Reticulated foam is an urethane-based foam with a well-defined open-cell structure. The cell size can be chosen to optimize penetration of the conductive coating to which it is adhered. Laird Technologies uses two separate processes to produce its reticulated foam absorber. This unique spray process applies a coating that is graded through the thickness of the foam. The grading of the coating also produces an electrical grading that results in a material with excellent broadband reflectivity reduction. Laird Technologies also uses a dip process to produce foam with uniform electrical properties. This type of foam is described in more detail in the Lossy foam section on page is produced to a specific insertion loss dB/in. at a specific insertion loss dB/in. at a specific frequency generally 3 or 10GHz . Laird Technologies also dips RFRET-CV, a convoluted egg-crate shaped foam. This shaping allows for graded impedance, which provides broadband reflectivity reduction. RFRET-CV is produced in thicknesses from to 4" 38,1 mm to 101,6 mm and is used when broadband performance from 2 to 18GHz is required. The product can be supplied with a bonded-on ground plane and pressure-sensitive adhesive. Applications RFRET broadband foam is commonly used around antennas to provide isolation or side lobe reduction. It can be die-cut into components for EMI reduction inside microwave cavities and is used to manufacture antenna hats and test boxes. It can be encapsulated into a textile cover for use outdoors and fabricated into blankets, covers and other components. Recently, it has been used for a combination air/EMI filter in networking equipment. The product can be made UL94 HF1 for such applications. Loss dB Figure Ordering Information Tables 1-3, on page 12, provide ordering information and existing part numbers for three types of reticulated foam absorbers RFRET-Graded Coating, RFRETUniform Coating and RFRET/CV Convoluted Reticulated Foam. RFRET - Graded Coating Select desired frequency range, noting thickness in ascending order from Table The base part number determines the length, width and frequency range. The other options column indicates flame retardant FR , pressuresensitive adhesive PSA or ground plane GP . Microwave Absorbing Foam RFRET - Reticulated Foam Absorbers con't Table 1 RFRET - Graded Coating Part Numbers Note Other combinations of attributes or materials are available please contact sales for assistance. 4000 - 4299 RFRET - GRADED COATING THICKNESS IN MM LENGTH IN MM WIDTH IN MM FREQ. RANGE GHZ 20DB OTHER 4044 609,6 609,6 12-18 4032 609,6 609,6 12-18 4054 609,6 609,6 10-18 4050 609,6 609,6 10-18 4000 609,6 609,6 10-18 4078 9,5 1219,2 609,6 10-18 4058 609,6 609,6 10-18 GP-PSA 4060 609,6 609,6 10-18 4074 12,7 609,6 609,6 8-18 4001 12,7 609,6 609,6 Ordering Information Table 1 lists existing part numbers for uniform Lossy foam materials. Select the thickness in ascending order and the part number. Within a given thickness, the insertion loss can be tailored by the addition of more of the conductive carbon coating. The other columns indicate flame retardant FR , pressure-sensitive adhesive PSA or ground plane GP . Performance is measured in dB insertion loss compared to air at 3GHz. Standard sheet size is 24" x 24" 609,6 mm x 609,6 mm other sizes are also available. Table 1 RFLS - Single Layer "Lossy" Sheets Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance. 5000 - 5299 RFLS - SINGLE LAYER "LOSSY" SHEETS THICKNESS IN MM LENGTH IN MM WIDTH IN MM INSERTION LOSS PER IN AT 3GHZ DB/IN 5020 609,6 609,6 5047 609,6 609,6 5072 609,6 609,6 5093 609,6 609,6 5049 609,6 609,6 5073 609,6 609,6 5040 609,6 609,6 5099 609,6 609,6 5002 609,6 609,6 5007 609,6 609,6 5006 609,6 609,6 5005 Ordering Information Table 1 lists the existing part numbers for broadband multilayer absorbers. Select the desired frequency range, noting thickness in ascending order . The base part number determines the length, width and frequency range. The other column indicates pressure-sensitive adhesive PSA and ground plane GP . Performance is nominally >-15dB reflectivity reduction over the frequency range listed. Standard sheet size is 24" x 24" 609,6 mm x 609,6 mm . Table 1 RFML - Multilayer Absorber Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance. 5300 - 5599 RFML - MULTILAYER ABSORBERS 5305 5311 5309 5314 5306 5312 5310 5313 5301 5307 5303 5300 5308 THICKNESS IN MM 6,4 9,5 9,5 9,5 9,5 19,1 19,1 19,1 19,1 28,6 28,6 57,2 114,3 LENGTH IN MM 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 WIDTH IN MM 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 FREQ RANGE GHZ 12-18 8-18 8-18 8-18 8-18 6-18 6-18 6-18 6-18 4-18 4-18 2-18 < 2-18 All dimensions shown are in inches millimeters unless otherwise specified. DB LOSS OTHER GP-PSA GP-PSA Microwave Absorbing Foam RFRIGID - Structural Microwave Absorbing Foam Laird Technologies manufactures a structural foam family with microwave absorbing properties. It is based on the RFRET reticulated foam absorber. RFRET is an excellent free-space absorber, but lacks toughness and environmental resistance. Because RFRET is open-celled, it can be filled with closed-celled structural foam to form RFRIGID. Three standard fillers are used rigid urethane, flexible urethane and epoxy. The resulting products range from 10 to 20 pounds per cubic foot density and offer a structural, environmentally tough panel. The materials can be molded to shape, machined or bonded into complex covers and shapes. If skins are applied, rigid lightweight structural panels are formed. Laird Technologies has developed new types of foam, including syntactic foam and phenolic foams. Contact an applications engineer for more details. Applications The ability to customize the mechanical and electrical properties of the foam allow for a wide range of applications including: • Absorptive pucks for spiral antenna cavities • Fairings for vehicles and radars • Antenna housings • Lightweight microwave absorbing barriers Loss dB Figure 2 0 -5 -10 -15 -20 -25 -30 -35 RFRIGID mm Thick P/N 4720 10 12 14 16 18 Frequency GHz Table 1 RFRIGID - Structural Microwave Absorbing Foam Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance. 4700 - 4799 RFRIGID - STRUCTURAL MICROWAVE ABSORBING FOAM 4738 4739 4701 4710 4703 4746 4711 4712 4720 4730 THICKNESS IN MM 12,7 12,7 19,1 19,1 25,4 25,4 31,8 31,8 31,8 31,8 LENGTH IN MM 609,6 609,6 609,6 609,6 304,8 1219,2 609,6 609,6 1219,2 609,6 WIDTH IN MM 609,6 609,6 609,6 609,6 304,8 914,4 609,6 609,6 914,4 914,4 FREQ. RANGE GHZ - 17DB 7-18 7-18 5-18 5-18 3-18 3-18 3-18 3-18 3-18 3-18 MATERIAL Ordering Information Table 1 shows existing standard part numbers for RFRIGID products. From the table, select desired thickness in ascending order . The part number determines the material type, length, width and frequency range of operation. The other column lists the closed-cell foam that is used to fill the reticulated foam. The thicker the foam material, the broader the frequency ranges of coverage. Performance is nominally -17 to -20dB reflectivity reduction over the frequency range listed. Available Fill Foam Materials are: E - Epoxy FU - Flexible Urethane RU - Rigid Urethane S - Syntactic Urethane Specialty Microwave Absorbers RFHC - Treated Honeycomb Core Absorbers RFHC is a broadband microwave absorbing honeycomb core material. Laird Technologies uses either or fiberglass honeycomb core and applies a "lossy" coating to it. The RF core can have a uniform coating to optimize insertion loss or a graded coating to optimize reflection loss. The cell sizes generally used are to 3,2 mm to 4,8 mm thick with densities of 3 to 4 lb./ft3. The performance curve in Figure 1 shows the typical performance of a 12,7 mm thick core, providing good attenuation over a broad frequency range. We can optimize the performance to account for laminated skins or core and can assist in selecting the right materials to minimize performance degradation. Figure RFHC P/N 6009 8 10 12 14 16 18 Loss dB Frequency GHz Applications RFHC materials are used as "lossy" loads in spiral antennas and high-power antenna couplers. They are used with laminated skins to manufacture radar absorbing structural RAS panels and components. Our engineering staff can design a material that meets your special requirements. Ordering Information Table 1 lists the existing part numbers for broadband microwave absorbing honeycomb core material. Select the desired thickness in ascending order , noting the desired frequency range. Select a cell size and density and the base part number. The base part number determines the length, width, density in terms of pounds per cubic foot PCF , cell size and frequency range. The thicker the core material, the broader the frequency ranges of coverage. Performance is nominally -17dB reflectivity reduction over the frequency range listed. The cell size of the honeycomb core is generally to 3,2 mm to 4,8 mm with a core type of either Nomex or fiberglass. Table 1 RFHC - Treated Honeycomb Core Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance. 6000 - 6799 RFHC - TREATED HONEYCOMB CORE THICKNESS IN MM LENGTH IN MM WIDTH IN MM DENSITY PSF CELL SIZE IN MM FREQ 6017 12,7 609,6 609,6 8-18 6003 12,7 304,8 304,8 8-18 6009 12,7 304,8 304,8 8-18 6000 12,7 304,8 304,8 8-18 6007 12,7 406,4 457,2 8-18 6008 12,7 304,8 304,8 8-18 6011 12,7 304,8 304,8 8-18 6050 15,9 609,6 609,6 8-18 6005 17,0 304,8 304,8 6-18 6049 19,1 609,6 609,6 6-18 6002 Ordering Information Table 1 shows existing standard part number configurations. Select the desired frequency and part number. The part number designates the thickness, length, width and frequency range. The other column indicates the use of pressuresensitive adhesive. Table 1 RFSS - Salisbury Screen Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance. 6800 - 6999 RFSS - SALISBURY SCREENS 6827 6802 THICKNESS IN MM 13,7 LENGTH IN MM 609,6 2438,4 WIDTH IN MM 609,6 1219,2 6803 609,6 609,6 6847 609,6 609,6 6848 609,6 609,6 6852 609,6 609,6 6814 609,6 609,6 All dimensions shown are in inches millimeters unless otherwise specified. FREQ. RANGE GHz -20dB OTHER PSA Specialty Microwave Absorbers Microwave Absorbing Textile Covers Absorbing textile antenna covers. Complete capability for manufacturing microwave absorbing textiles. Laird Technologies integrates microwave absorbing or reflecting properties into custom covers, screens and other textile products to fit different application needs. Applications for these products include • Test blankets for shipboard EMI • Diagnostics for PCS antenna installations • Covers for radomes, hangar doors or other ship articles • Covers for guns, turrets or other vehicle articles • Tents and equipment housings • Personnel clothing and covers • Cushions and boat articles Many of these products are based upon Laird Technologies RFRET foam material. RFRET is open-celled lightweight foam, which is flexible and provides excellent broadband microwave absorption. The absorber can be sewn or RF welded into different textile materials. The textile cover is chosen based upon the environmental properties desired. Vinyl, neoprene, silicone and are commonly used materials. Reinforcements include nylon, fiberglass, polyester and Kevlar A variety of attachment schemes can be used including Velcro zippers, buckles, tie downs and other standard attachments. Camouflage materials can also be used to provide both RF and visual protection. The foam works equally well at millimeter wave frequencies. Laird Technologies is working with other companies to provide infrared protection and integrate conductive materials into fabric coatings. A variety of conductive materials are available including Flectron nickel/copper coated fabric, aluminized glass mat, lightweight scrims and wire screens. Fabric covered foam for weatherproof applications. 18 Custom fabric coated RFML absorber. Custom Magnetic Absorbers

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Microwave Absorbing Materials

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NOTICE Although the information and recommendations set forth herein hereinafter "information" are presented in good faith and believed to be correct as of the date hereof, Laird Technologies makes no representation or warranties as to the completeness or accuracy thereof. Information is supplied upon the condition that the persons receiving same will make their own determination as to its suitability for their purposes prior to use. In no event will Laird Technologies be responsible for damages of any nature whatsoever resulting from the use or reliance upon information or the product to which information refers. Nothing contained herein is to be construed as a recommendation to use any product, process, equipment or formulation in conflict with any patent, and Laird Technologies makes no representation or warranty, expressed or implied, that the use thereof will not infringe any patent. The data set forth in all tables, charts, graphs and figures herein are based on samples tested and are not guaranteed for all samples or applications. Such data are intended as guides and do not reflect product specifications for any particular product. NO REPRESENTATION OR WARRANTIES, EITHER EXPRESSED OR IMPLIED, OR MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OF ANY OTHER NATURE ARE MADE HEREUNDER WITH RESPECT TO INFORMATION OR THE PRODUCT TO WHICH INFORMATION REFERS.

ABSORB-CAT-2006
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Laird Technologies is committed to providing the world's leading OEMs with comprehensive solutions for their antenna, EMI shielding, telematics and thermal management requirements.

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table of contents
# Part Number Cross rfeference. 2

Introduction to Microwave Absorbers Principles of Operation. 3 Resonant Absorbers. 3 Graded-Dielectric Absorbers. 4 Material Selection. 5 Electrical Performance Guidelines. 5 Physical Performance Guidelines. 5 Absorber Types. 5 Applications Military, Commercial . 6

Microwave Absorbing Elastomers Q-Zorb RFSB - Single Band Absorbers. 7 Q-Zorb RFSW - Surface Wave Absorbers 9

Specialty Microwave Absorbers RFHC - Treated Honeycomb Core Absorbers 16 RFSS - Salisbury Screens. 17 Microwave Absorbing Textile Covers. 18

Custom Magnetic Absorbers Thermoplastic Extruding. 19 Liquid Resin Systems 19 Extruded Elastomers. 19
When ordering, please call our sales department to availability and lead times.

Part No. 1000-2999
1000-1999 2000-2999 4000-4999 4000-4299 4300-4399 4500-4599 4700-4799 5000-5999 5000-5299 5300-5599 6000-6999 6000-6799 6800-6999

Product MICROWAVE ABSORBING ELASTOMERS Q-ZORB SINGLE BAND ABSORBERS Q-ZORB SURFACE WAVE ABSORBERS RETICULATED FOAM MICROWAVE ABSORBERS GRADED RETICULATED FOAM ABSORBERS UNIFORM RETICULATED FOAM ABSORBERS CONVOLUTED RETICULATED FOAM ABSORBERS RIGID RETICULATED FOAM ABSORBERS OPEN-CELL FOAM ABSORBERS SINGLE LAYER "LOSSY" ABSORBERS MULTILAYER "LOSSY" ABSORBERS LIGHTWEIGHT ABSORBERS HONEYCOMB ABSORBERS SALISBURY SCREEN ABSORBERS

Page No.
12 15
13 14
16 17

Introduction to Microwave Absorbers

Interest in microwave-absorbing material technology has been growing. As the name implies, microwave-absorbing materials are coatings whose electrical and/or magnetic properties have been altered to allow absorption of microwave energy at discrete or broadband frequencies. There are several techniques to achieve these properties. The goal of the absorber manufacturer is to balance electrical performance, thickness, weight, mechanical properties and cost.

Principles of Operation Altering the dielectric and magnetic properties of existing materials will produce microwave absorbers. For purposes of analysis, the dielectric properties of a material are categorized as its permittivity and the magnetic properties as its permeability. Both are complex numbers with real and imaginary parts. Common dielectric materials used for absorbers, such as foams, plastics and elastomers, have no magnetic properties, giving them permeability of Magnetic materials, such as ferrites, iron and cobalt-nickel alloys, are used to alter the permeability of the base materials. High dielectric materials, such as carbon, graphite and metal flakes, are used to modify the dielectric properties.

When an electromagnetic wave, propagating through a free-space impedance of Z0, is incident upon a semi-infinite dielectric or magnetic dielectric boundary of impedance Z1, a partial reflection occurs. The magnitude of the reflection coefficient is governed by the following equation:

Figure

Mutual Cancellation of Reflected and Emergent Waves Incident Wave

Total Emergent Wave = - e1 + e2 + e3 etc.
d Quarter Wave Layer

Metal Reflector

Resonant absorber showing out-of-phase condition existing between reflected and emergent waves.

R = 1 Z1/Z0
1 + Z1/Z0

Where
u0 e0
u1 e1

To achieve a reflection coefficient of zero Z0 = Z1. This condition is achieved when:
u1 e1
u0 e0

The perfect absorber would therefore have u1 to e1 and be as large as possible to achieve absorption in the thinnest layer possible. Unfortunately,
at microwave frequencies, u1 generally does not approach the magnitude of e1. However, other techniques can be used for microwave absorption. In general, practical microwave absorbers are one of two basic types resonant
or graded dielectric.

Resonant Absorbers The simplest type of resonant absorber is the Salisbury Screen. It consists of a resistive sheet spaced one-quarter wavelength from a conductive ground plane. The resistive sheet is as thin as possible with a resistance of 377 ohms per square matching that of free space. Figure 1 illustrates its operation. A wave incident upon the surface of the screen is partially reflected and partially transmitted. The transmitted portion undergoes multiple internal reflections to give rise to a series of emergent waves. At the design frequency, the sum of the emergent waves is equal in amplitude to, by 180o out of phase with, the initial reflected portion. In theory, zero reflection takes place at the frequency in practice, absorption of greater than 30dB may be achieved see Figure

Figure

Loss dB

RFSS-10 P/N 6852
8 10 12 14 16 18

Frequency GHz

Salisbury Screen resonant absorber at 10GHz.

Introduction to Microwave Absorbers

The inherent problems of the Salisbury Screen are poor flexibility, poor environmental resistance and increased thickness, especially at lower frequencies. Distributing dielectric and/or magnetic fillers into a flexible matrix, such as an elastomer, can produce a more practical absorber. Increasing the permeability and permittivity of the layer increases the refractive index ue, thus decreasing thickness by the relations 1/ ue. The dramatic difference in thickness achievable can be illustrated by comparing two microwave absorbers. RFSS-10 is a Salisbury Screen-type absorber tuned to 10GHz and is nominally 6,4 mm thick. RFSB-10 is an elastomer loaded with carbonyl iron filler and is 1,7 mm thick. The same electrical performance can be achieved in a material that is 25% as thick although a weight penalty must be paid . The RFSB absorber is also very flexible and adaptable to outdoor environments.

Resonant materials can also be produced to absorb at multiple frequencies. By controlling the critical magnetic/dielectric loading and thickness of each layer, two discrete frequencies can be tuned. These flexible dual-band absorbers are standard production products and have the added advantage of broadband absorption. For example, a dual-band absorber with appropriate resonant points will have greater than 15dB absorption over an octave bandwidth see Figure

Figure

Graded-Dielectric Absorbers The other absorber category is the graded-dielectric absorber. Its principle of operation is quite different from that of the resonant type. Absorption is achieved by a gradual tapering of impedance from that of free space to a highly "lossy" state. If this transition is done smoothly, little reflection from the front face will result. Anechoic chamber materials accomplish this via the pyramidal shape of the absorber see Figure The absorbing medium is a conductive carbon in polyurethane foam. Absorption levels of greater than 50dB can be obtained with pyramids many wavelengths thick. These are impractical for electromagnetic interference EMI or radar cross-section RCS reduction. Good levels of reflectivity reduction greater than 20dB can be achieved in materials less than 1/3 wavelength thick. In this case, a very open-celled 10 pores per inch foam is used. A gradual transition is achieved via a conductive carbon coating. Figure 5 depicts typical performance where reflectivity levels of -20dB are achieved from 4 to 18GHz and above at a thickness of 31,8 mm .
Ordering Information Select the desired frequency of operation listed in ascending order from Table This selection will govern dB loss and thickness. Then choose the material type and other options including flame retardant FR , pressure-sensitive adhesive PSA , ground plane GP , or iron silicide FeSi and select a part number.

Material Types Available FS - Fluorosilicone H - N - Nitrile R- Natural Rubber

S- Silicone U - Urethane V - Viton W - Neoprene
1122 1019 1065 1048 1039 1049 1031 1007 1236 1027 1125 1124 1060 1059 1267 1084 1083 1044 1043 1042 1040 1167 1101 1086 1085 1071 1070 1268 1104 1126 1073 1016 1164 1062 1061 1088 1087 1008 1105 1021 1056 1269 1106 1033 1032 1080 1079 1107 1270 1057

MATERIAL TYPE R N R N R N S N R S N S N R S N R S N R S R N S N S N

FREQ GHZ

DB LOSS

THICKNESS IN MM
6,4,2 3,8 3,8 3,6 3,4 3,4 3,4 2,7 2,9 2,9 2,5 2,5 2,7 2,9 2,9 2,7 2,7 2,4 2,4 2,0 2,4 2,8 2,8 2,4 2,4 2,4 2,4 2,4 2,4 1,9 2,1 2,1 2,1 2,2,2,0 1,9 1,9 2,2 1,8 1,9 1,9 1,9 1,7 1,7 1,8 1,8 1,8

OTHER

PSA GP PSA GP PSA GP PSA
1090 1089 1137 1130 1034 1005 1271 1017 1118 1013 1068 1078 1077 1025 1092 1091 1259 1018 1024 1063 1109 1009 1029 1023 1115 1161 1006 1110 1094 1093 1067 1168 1022 1010 1096 1097 1160 1045 1111 1272 1014 1038 1112 1116 1015 1117 1273 1132 1274

MATERIAL TYPE N S N S N S N S N S N S R S R S N S N R N S N S R S R S N S

TYPE FREQ GHZ

DB LOSS

All dimensions shown are in inches millimeters unless otherwise specified.

THICKNESS IN MM
1,8 1,8 2,3 1,8 1,7 1,7 1,7 1,6 1,6 1,6 1,5 1,6 1,6 1,5 1,5 1,5 1,5 1,5 1,7 1,7 1,4 1,4 1,4 1,4 1,3 1,3 1,5 1,3 1,3 1,3 1,1,1,3 1,4 1,1,1,0,9 1,0 1,1,0 1,0,9 0,9 0,9 1,1 0,9 0,9 0,8

OTHER GP

PSA GP-PSA

GP PSA GP-PSA GP PSA

PSA GP PSA GP PSA

Microwave Absorbing Elastomers

RFSW - Surface Wave Absorbers

Q-Zorb RFSW surface wave absorbers are thin, magnetically loaded elastomeric sheets designed to provide attenuation at high angles of incidence for surface wave attenuation. They are nominally manufactured in the thickness range of to 0,4 mm to 3,2 mm . They are elastomer-based with a variety of choices available. For example, silicone is chosen for high-temperature applications, nitrile for fuel and oil resistance and natural rubber for commercial applications. Several magnetic fillers are available carbonyl iron powder is standard, but other materials such as iron silicide FeSi are used for corrosionresistant applications. The materials are available in UL fire retardant versions for use in commercial devices. Laird Technologies can provide the material die-cut and with a pressure-sensitive adhesive for ease of installations. Sheets are offered in nominal sizes of 24" x 24" 609,6 mm x 609,6 mm , although custom sizes and molded components are available.

Applications The material can be used inside of microwave housings to reduce internal resonance and to lower the "Q" of the microwave cavity. They are also effective in isolating antennas from ground plane reflections. Q-Zorb can be used with board level shielding and other types of EMI shielding to enhance the shielding effectiveness at frequencies from 2-40GHz.

Figure

Loss dB

Q-Zorb Surface Wave mm Thick P/N 2016
10 12 14 16 18
-35 Frequency GHz

Figure

Loss dB

Q-Zorb Surface Wave mm Thick P/N 2240
10 12 14 16 18
-35 Frequency GHz

Figure

Loss dB

Q-Zorb Surface Wave mm Thick P/N 2238
8 10 12 14 16 18
-35 Frequency GHz
Ordering Information Select desired frequency of operation listed in ascending order from Table 1 on the next page. This selection will govern dB loss and thickness. Then choose material type and other options including flame retardant FR , pressuresensitive adhesive PSA , ground plane GP , or iron silicide FeSi and select a part number.

Material Types Available FS - Fluorosilicone H - N - Nitrile R - Natural Rubber

S - Silicone U - Urethane V - W - Neoprene

Table 1 RFSW - Surface Wave Absorber Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance.
2000 - 2999 RFSW - SURFACE WAVE ABSORBERS
2138 2130 2062 2178 2049 2247 2032 2222 2129 2171 2170 2016 2196 2142 2242 2264 2162 2161 2041 2044 2258 2021 2220 2094 2272 2230 2167 2034 2190 2068 2087 2042 2002 2123 2122 2023 2095 2257 2256 2141 2231 2248 2047 2225 2266 2265 2080 2082 2081 2097 2005 2039 2147

MATERIAL TYPE S N R S N R S N R N R S N R S R N R S N R N R N

THICKNESS IN MM
4,7 4,6 4,6 4,6 4,4,4,3,5 3,2 3,2 3,2 3,2 3,2 3,2 3,2 3,2,9 2,9 2,8 2,8 2,8 2,5 2,5 2,5 2,5 2,5 2,4 2,4 2,4 2,3 2,3 2,2,2,0 2,0 2,0 2,0 2,0 2,0 2,0 2,0 1,9 1,9 1,8 1,8 1,8 1,7 1,7 1,7 1,7 1,6 1,5 1,5

OPT. FREQ. RANGE GHZ *
<2 <2 <2 <2 <2 <2 <2 <2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4 2-4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8 4-8-12 8-12 8-12 8-12 8-12 8-12 8-12

OTHER

PSA GP PSA FR-PSA

PSA FR-PSA

PSA FR-PSA FR PSA

PSA GP-PSA GP PSA
2038 2263 2261 2240 2239 2221 2134 2133 2113 2169 2056 2296 2057 2093 2105 2153 2168 2143 2099 2031 2146 2218 2238 2237 2270 2028 2252 2251 2204 2260 2045 2191 2181 2151 2152 2236 2235 2046 2144 2119 2140 2078 2136 2053 2201 2112 2120 2234 2233 2075 2966 2963 2960

MATERIAL TYPE R S R N s N R S N R S N S N R S R S N S N R S

THICKNESS IN MM
1,5 1,5 1,5 1,5 1,5 1,5 1,4 1,4 1,3 1,3 1,3 1,3 1,3 1,1,1,1,1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0,9 0,9 0,9 0,9 0,8 0,8 0,8 0,8 0,8 0,8 0,8 0,8 0,7 0,7 0,6 0,6 0,6 0,6 0,5 0,5 0,5 0,5 0,5 0,5 0,5 0,4 0,3 0,3

OPT. FREQ RANGE GHZ "
8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12 8-12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18 12-18

OTHER PSA

PSA FR-PSA

PSA FR-PSA GP-PSA

PSA FR-PSA

GP FR-PSA

FR PSA

PSA GP

PSA FR-PSA

PSA FR-PSA
* Adequate surface wave performance may be achieved by using thinner materials. Consult Laird Technologies applications engineers for assistance.

All dimensions shown are in inches millimeters unless otherwise specified.

Microwave Absorbing Foam

RFRET - Reticulated Foam Absorbers

RFRET is a reticulated foam absorber. Reticulated foam is an urethane-based foam with a well-defined open-cell structure. The cell size can be chosen to optimize penetration of the conductive coating to which it is adhered. Laird Technologies uses two separate processes to produce its reticulated foam absorber. This unique spray process applies a coating that is graded through the thickness of the foam. The grading of the coating also produces an electrical grading that results in a material with excellent broadband reflectivity reduction.

Laird Technologies also uses a dip process to produce foam with uniform electrical properties. This type of foam is described in more detail in the Lossy foam section on page is produced to a specific insertion loss dB/in. at a specific insertion loss dB/in. at a specific frequency generally 3 or 10GHz .

Laird Technologies also dips RFRET-CV, a convoluted egg-crate shaped foam. This shaping allows for graded impedance, which provides broadband reflectivity reduction. RFRET-CV is produced in thicknesses from to 4" 38,1 mm to 101,6 mm and is used when broadband performance from 2 to 18GHz is required. The product can be supplied with a bonded-on ground plane and pressure-sensitive adhesive.

Applications RFRET broadband foam is commonly used around antennas to provide isolation or side lobe reduction. It can be die-cut into components for EMI reduction inside microwave cavities and is used to manufacture antenna hats and test boxes. It can be encapsulated into a textile cover for use outdoors and fabricated into blankets, covers and other components. Recently, it has been used for a combination air/EMI filter in networking equipment. The product can be made UL94 HF1 for such applications.

Loss dB

Figure
Ordering Information Tables 1-3, on page 12, provide ordering information and existing part numbers for three types of reticulated foam absorbers RFRET-Graded Coating, RFRETUniform Coating and RFRET/CV Convoluted Reticulated Foam.

RFRET - Graded Coating Select desired frequency range, noting thickness in ascending order from Table The base part number determines the length, width and frequency range. The other options column indicates flame retardant FR , pressuresensitive adhesive PSA or ground plane GP .

Microwave Absorbing Foam

RFRET - Reticulated Foam Absorbers con't

Table 1 RFRET - Graded Coating Part Numbers Note Other combinations of attributes or materials are available please contact sales for assistance.
4000 - 4299 RFRET - GRADED COATING

THICKNESS IN MM

LENGTH IN MM

WIDTH IN MM

FREQ. RANGE GHZ 20DB

OTHER
4044
609,6 609,6
12-18
4032
609,6 609,6
12-18
4054
609,6 609,6
10-18
4050
609,6 609,6
10-18
4000
609,6 609,6
10-18
4078
9,5 1219,2 609,6
10-18
4058
609,6 609,6
10-18

GP-PSA
4060
609,6 609,6
10-18
4074
12,7 609,6 609,6
8-18
4001
12,7 609,6 609,6
Ordering Information Table 1 lists existing part numbers for uniform Lossy foam materials. Select the thickness in ascending order and the part number. Within a given thickness, the insertion loss can be tailored by the addition of more of the conductive carbon coating. The other columns indicate flame retardant FR , pressure-sensitive adhesive PSA or ground plane GP . Performance is measured in dB insertion loss compared to air at 3GHz. Standard sheet size is 24" x 24" 609,6 mm x 609,6 mm other sizes are also available.

Table 1 RFLS - Single Layer "Lossy" Sheets Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance.
5000 - 5299 RFLS - SINGLE LAYER "LOSSY" SHEETS

THICKNESS IN MM

LENGTH IN MM

WIDTH IN MM

INSERTION LOSS PER IN AT 3GHZ DB/IN
5020
609,6
609,6
5047
609,6
609,6
5072
609,6
609,6
5093
609,6
609,6
5049
609,6
609,6
5073
609,6
609,6
5040
609,6
609,6
5099
609,6
609,6
5002
609,6
609,6
5007
609,6
609,6
5006
609,6
609,6
5005
Ordering Information Table 1 lists the existing part numbers for broadband multilayer absorbers. Select the desired frequency range, noting thickness in ascending order . The base part number determines the length, width and frequency range. The other column indicates pressure-sensitive adhesive PSA and ground plane GP .

Performance is nominally >-15dB reflectivity reduction over the frequency range listed. Standard sheet size is 24" x 24" 609,6 mm x 609,6 mm .

Table 1 RFML - Multilayer Absorber Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance.
5300 - 5599 RFML - MULTILAYER ABSORBERS
5305 5311 5309 5314 5306 5312 5310 5313 5301 5307 5303 5300 5308

THICKNESS IN MM
6,4 9,5 9,5 9,5 9,5 19,1 19,1 19,1 19,1 28,6 28,6 57,2 114,3

LENGTH IN MM
609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6

WIDTH IN MM
609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6 609,6

FREQ RANGE GHZ 12-18 8-18 8-18 8-18 8-18 6-18 6-18 6-18 6-18 4-18 4-18 2-18 < 2-18

All dimensions shown are in inches millimeters unless otherwise specified.

DB LOSS OTHER

GP-PSA

GP-PSA

Microwave Absorbing Foam

RFRIGID - Structural Microwave Absorbing Foam

Laird Technologies manufactures a structural foam family with microwave absorbing properties. It is based on the RFRET reticulated foam absorber. RFRET is an excellent free-space absorber, but lacks toughness and environmental resistance. Because RFRET is open-celled, it can be filled with closed-celled structural foam to form RFRIGID. Three standard fillers are used rigid urethane, flexible urethane and epoxy. The resulting products range from 10 to 20 pounds per cubic foot density and offer a structural, environmentally tough panel. The materials can be molded to shape, machined or bonded into complex covers and shapes. If skins are applied, rigid lightweight structural panels are formed.

Laird Technologies has developed new types of foam, including syntactic foam and phenolic foams. Contact an applications engineer for more details.

Applications The ability to customize the mechanical and electrical properties of the foam allow for a wide range of applications including:
• Absorptive pucks for spiral antenna cavities
• Fairings for vehicles and radars
• Antenna housings
• Lightweight microwave absorbing barriers

Loss dB

Figure
2 0 -5 -10 -15 -20 -25 -30 -35

RFRIGID mm Thick P/N 4720
10 12 14 16 18

Frequency GHz

Table 1 RFRIGID - Structural Microwave Absorbing Foam Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance.
4700 - 4799 RFRIGID - STRUCTURAL MICROWAVE ABSORBING FOAM
4738 4739 4701 4710 4703 4746 4711 4712 4720 4730

THICKNESS IN MM
12,7 12,7 19,1 19,1 25,4 25,4 31,8 31,8 31,8 31,8

LENGTH IN MM 609,6 609,6 609,6 609,6 304,8 1219,2 609,6 609,6 1219,2 609,6

WIDTH IN MM 609,6 609,6 609,6 609,6 304,8 914,4 609,6 609,6 914,4 914,4

FREQ. RANGE GHZ - 17DB
7-18 7-18 5-18 5-18 3-18 3-18 3-18 3-18 3-18 3-18

MATERIAL
Ordering Information Table 1 shows existing standard part numbers for RFRIGID products. From the table, select desired thickness in ascending order . The part number determines the material type, length, width and frequency range of operation. The other column lists the closed-cell foam that is used to fill the reticulated foam. The thicker the foam material, the broader the frequency ranges of coverage. Performance is nominally -17 to -20dB reflectivity reduction over the frequency range listed.

Available Fill Foam Materials are:

E - Epoxy

FU - Flexible Urethane

RU - Rigid Urethane

S - Syntactic Urethane

Specialty Microwave Absorbers

RFHC - Treated Honeycomb Core Absorbers

RFHC is a broadband microwave absorbing honeycomb core material. Laird Technologies uses either or fiberglass honeycomb core and applies a "lossy" coating to it. The RF core can have a uniform coating to optimize insertion loss or a graded coating to optimize reflection loss. The cell sizes generally used are to 3,2 mm to 4,8 mm thick with densities of 3 to 4 lb./ft3. The performance curve in Figure 1 shows the typical performance of a 12,7 mm thick core, providing good attenuation over a broad frequency range. We can optimize the performance to account for laminated skins or core and can assist in selecting the right materials to minimize performance degradation.

Figure

RFHC P/N 6009
8 10 12 14 16 18

Loss dB

Frequency GHz

Applications RFHC materials are used as "lossy" loads in spiral antennas and high-power antenna couplers. They are used with laminated skins to manufacture radar absorbing structural RAS panels and components. Our engineering staff can design a material that meets your special requirements.
Ordering Information Table 1 lists the existing part numbers for broadband microwave absorbing honeycomb core material. Select the desired thickness in ascending order , noting the desired frequency range. Select a cell size and density and the base part number. The base part number determines the length, width, density in terms of pounds per cubic foot PCF , cell size and frequency range.

The thicker the core material, the broader the frequency ranges of coverage. Performance is nominally -17dB reflectivity reduction over the frequency range listed. The cell size of the honeycomb core is generally to 3,2 mm to 4,8 mm with a core type of either Nomex or fiberglass.

Table 1 RFHC - Treated Honeycomb Core Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance.
6000 - 6799 RFHC - TREATED HONEYCOMB CORE

THICKNESS IN MM

LENGTH IN MM

WIDTH IN MM

DENSITY PSF

CELL SIZE IN MM

FREQ
6017
12,7 609,6 609,6
8-18
6003
12,7 304,8 304,8
8-18
6009
12,7 304,8 304,8
8-18
6000
12,7 304,8 304,8
8-18
6007
12,7 406,4 457,2
8-18
6008
12,7 304,8 304,8
8-18
6011
12,7 304,8 304,8
8-18
6050
15,9 609,6 609,6
8-18
6005
17,0 304,8 304,8
6-18
6049
19,1 609,6 609,6
6-18
6002
Ordering Information Table 1 shows existing standard part number configurations. Select the desired frequency and part number. The part number designates the thickness, length, width and frequency range. The other column indicates the use of pressuresensitive adhesive.

Table 1 RFSS - Salisbury Screen Part Numbers Note Other materials or combinations of attributes are available please contact sales for assistance.
6800 - 6999 RFSS - SALISBURY SCREENS
6827
6802

THICKNESS IN MM
13,7

LENGTH IN MM
609,6
2438,4

WIDTH IN MM
609,6
1219,2
6803
609,6
609,6
6847
609,6
609,6
6848
609,6
609,6
6852
609,6
609,6
6814
609,6
609,6

All dimensions shown are in inches millimeters unless otherwise specified.

FREQ. RANGE GHz -20dB

OTHER PSA

Specialty Microwave Absorbers

Microwave Absorbing Textile Covers

Absorbing textile antenna covers.

Complete capability for manufacturing microwave absorbing textiles.

Laird Technologies integrates microwave absorbing or reflecting properties into custom covers, screens and other textile products to fit different application needs. Applications for these products include
• Test blankets for shipboard EMI
• Diagnostics for PCS antenna installations
• Covers for radomes, hangar doors or other ship articles
• Covers for guns, turrets or other vehicle articles
• Tents and equipment housings
• Personnel clothing and covers
• Cushions and boat articles

Many of these products are based upon Laird Technologies RFRET foam material. RFRET is open-celled lightweight foam, which is flexible and provides excellent broadband microwave absorption. The absorber can be sewn or RF welded into different textile materials. The textile cover is chosen based upon the environmental properties desired. Vinyl, neoprene, silicone and are commonly used materials. Reinforcements include nylon, fiberglass, polyester and Kevlar A variety of attachment schemes can be used including Velcro zippers, buckles, tie downs and other standard attachments.

Camouflage materials can also be used to provide both RF and visual protection. The foam works equally well at millimeter wave frequencies. Laird Technologies is working with other companies to provide infrared protection and integrate conductive materials into fabric coatings. A variety of conductive materials are available including Flectron nickel/copper coated fabric, aluminized glass mat, lightweight scrims and wire screens.

Fabric covered foam for weatherproof applications. 18

Custom fabric coated RFML absorber.

Custom Magnetic Absorbers

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived 1059 Datasheet file may be downloaded here without warranties.

1059

1059 Datasheet

Datasheet ID: 1059 645249