6999

6999 Datasheet

Part	Datasheet
6999	6999 (pdf)

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Microwave Absorbing Materials SOLUTIONS Innovative Technology for a Connected World ABOUT LAIRD TECHNOLOGIES Laird Technologies designs and manufactures customized, performance-critical products for wireless and other advanced electronics applications. The company is a global market leader in the design and supply of electromagnetic interference EMI shielding, thermal management products, specialty metals, signal integrity components, and wireless antennae solutions, as well as radio frequency RF modules and systems. Laird Technologies is the world leader in the design and manufacture of customized, performance-critical products for wireless and other advanced electronics applications. Laird Technologies partners with its customers to customize product solutions for applications in many industries including: • Network Equipment • Handsets • Telecommunications • Data Transfer & Information Technology • Computers • Automotive Electronics • Aerospace • Defense • Medical Equipment • Consumer Electronics • Industrial Laird Technologies offers its customers unique product solutions, dedication to research and development, as well as a seamless network of manufacturing and customer support facilities across the globe. ANTENNAS & RECEPTION WIRELESS REMOTE CONTROL EMI SOLUTIONS THERMAL MANAGEMENT WIRELESS M2M & TELEMATICS TABLE OF CONTENTS DESIGN GUIDE FOR COMMERCIAL MICROWAVE ABSORBERS MICROWAVE ABSORBING ELASTOMERS HF High Frequency Surface Wave Absorbers HP High Permeability Absorbers CA-19 MICROWAVE ABSORBING FOAM RFRET - Reticulated Foam Absorbers RFLS - Single Layer "Lossy" Foam Absorbers ANALYSIS, TEST AND PROTOTYPE DEVELOPMENT MICROWAVE ABSORBING MATERIALS DESIGN GUIDE FOR COMMERCIAL MICROWAVE ABSORBERS Microwave absorbers have been used in military applications for several decades. They have been traditionally used for EMI reduction, antenna pattern shaping and radar cross reduction. More recently with the rise of wireless electronics and the movement to higher frequencies microwave absorbers or “noise suppression sheets” NSS are used to reduce electromagnetic interference EMI inside of the wireless electronics assemblies. Two types of NSS are used for these types of applications. They are described below: MAGNETIC ABSORBERS These are thin to 3 mm polymeric materials filled with magnetic particles. These materials have both high permeability magnetic loss properties and high permittivity dielectric loss properties . This combination of properties makes these materials very effective in eliminating high frequency EMI ABSORBER APPLICATIONS Electronic operating at high frequencies can have problems with emission of high frequency noise. Once put inside an enclosure, the energy will add in phase at certain frequencies to cause resonances which will hinder the performance of the device. A good example of this phenomenon is seen in Figure The amplifier was measured in the condition shown and subsequently remeasured inside of its enclosure. When put inside the enclosure the performance was severely degraded due to cavity resonances inside of the enclosure. The measured data is shown below in Figure Laird Technologies has two product types that are used for commercial applications: HP high permeability uses novel magnetic fillers to achieve extremely high permeabilities at low frequencies. This allows for relatively thin materials to provide EMI reduction at frequencies below 2 GHz. This material comes in thicknesses of mm and mm. HF high frequency is the optimum choice for cavity resonance problems from 2-18 GHz and higher. The material is available in thicknesses from .5mm to mm and is supplied in sheets or as die cut components. Both materials are UL-VO and ROHS compliant. They can be supplied with pressure sensitive adhesive PSA for ease of installation. FOAM ABSORBERS These absorbers are based upon open celled foam impregnated with a carbon coating. The carbon coating makes the resultant product lossy at microwave frequencies, indeed acting like a free space resistor to incoming electromagnetic energy. These foam products range from mm to mm for internal cavity applications and can be several centimeters thick for outdoor applications. Two main product types are offered by Laird Technologies Lossy sheets are uniformly loaded with the carbon coating and used at mm and mm thick. They are supplied as sheet materials and may have PSA applied and fire retardant coatings. Figure Variable Gain Broadband Amplifier 100 MHz to 12 GHz Amplifier Performance S21 magn [dB] Frequency GHz Figure erformance of Amplifier in Open Condition and Inside Enclosure

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Microwave Absorbing Materials

SOLUTIONS

Innovative Technology for a Connected World

ABOUT LAIRD TECHNOLOGIES

Laird Technologies designs and manufactures customized, performance-critical products for wireless and other advanced electronics applications.

The company is a global market leader in the design and supply of electromagnetic interference EMI shielding, thermal management products, specialty metals, signal integrity components, and wireless antennae solutions, as well as radio frequency RF modules and systems.

Laird Technologies is the world leader in the design and manufacture of customized, performance-critical products for wireless and other advanced electronics applications. Laird Technologies partners with its customers to customize product solutions for applications in many industries including:
• Network Equipment
• Handsets
• Telecommunications
• Data Transfer & Information Technology
• Computers
• Automotive Electronics
• Aerospace
• Defense
• Medical Equipment
• Consumer Electronics
• Industrial

Laird Technologies offers its customers unique product solutions, dedication to research and development, as well as a seamless network of manufacturing and customer support facilities across the globe.

ANTENNAS & RECEPTION WIRELESS REMOTE CONTROL

EMI SOLUTIONS THERMAL MANAGEMENT WIRELESS M2M & TELEMATICS

TABLE OF CONTENTS

DESIGN GUIDE FOR COMMERCIAL MICROWAVE ABSORBERS

MICROWAVE ABSORBING ELASTOMERS

HF High Frequency Surface Wave Absorbers

HP High Permeability Absorbers CA-19

MICROWAVE ABSORBING FOAM

RFRET - Reticulated Foam Absorbers

RFLS - Single Layer "Lossy" Foam Absorbers

ANALYSIS, TEST AND

PROTOTYPE DEVELOPMENT

MICROWAVE ABSORBING MATERIALS

DESIGN GUIDE FOR COMMERCIAL MICROWAVE ABSORBERS

Microwave absorbers have been used in military applications for several decades. They have been traditionally used for EMI reduction, antenna pattern shaping and radar cross reduction. More recently with the rise of wireless electronics and the movement to higher frequencies microwave absorbers or “noise suppression sheets” NSS are used to reduce electromagnetic interference EMI inside of the wireless electronics assemblies.

Two types of NSS are used for these types of applications. They are described below:

MAGNETIC ABSORBERS

These are thin to 3 mm polymeric materials filled with magnetic particles. These materials have both high permeability magnetic loss properties and high permittivity dielectric loss properties . This combination of properties makes these materials very effective in eliminating high frequency EMI

ABSORBER APPLICATIONS

Electronic operating at high frequencies can have problems with emission of high frequency noise. Once put inside an enclosure, the energy will add in phase at certain frequencies to cause resonances which will hinder the performance of the device. A good example of this phenomenon is seen in Figure The amplifier was measured in the condition shown and subsequently remeasured inside of its enclosure. When put inside the enclosure the performance was severely degraded due to cavity resonances inside of the enclosure. The measured data is shown below in Figure

Laird Technologies has two product types that are used for commercial applications:

HP high permeability uses novel magnetic fillers to achieve extremely high permeabilities at low frequencies. This allows for relatively thin materials to provide EMI reduction at frequencies below 2 GHz. This material comes in thicknesses of mm and mm.

HF high frequency is the optimum choice for cavity resonance problems from 2-18 GHz and higher. The material is available in thicknesses from .5mm to mm and is supplied in sheets or as die cut components. Both materials are UL-VO and ROHS compliant. They can be supplied with pressure sensitive adhesive PSA for ease of installation.

FOAM ABSORBERS

These absorbers are based upon open celled foam impregnated with a carbon coating. The carbon coating makes the resultant product lossy at microwave frequencies, indeed acting like a free space resistor to incoming electromagnetic energy. These foam products range from mm to mm for internal cavity applications and can be several centimeters thick for outdoor applications. Two main product types are offered by Laird Technologies

Lossy sheets are uniformly loaded with the carbon coating and used at mm and mm thick. They are supplied as sheet materials and may have PSA applied and fire retardant coatings.

Figure Variable Gain Broadband Amplifier 100 MHz to 12 GHz

Amplifier Performance

S21 magn [dB]

Frequency GHz

Figure erformance of Amplifier in Open Condition and Inside Enclosure

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6999

6999 Datasheet

Datasheet ID: 6999 645186