RF & Microwave Absorption

Microwave absorbers are used to solve a wide variety of problems such as internal cavity resonances, antenna pattern shaping, and high-frequency interference.

Laird offers solutions that include microwave absorbing elastomers, phase cancellation materials, microwave absorbing foam, specialty microwave absorbers, custom magnetic absorbers and advanced frequency selective products.

All of our absorbers can be used at higher frequencies than traditional shielding and with other EMI shields to extend frequency range. 

Contact Laird today for your complete application solutions.

Find Products
Hybrid Absorber Product
Low Loss Dielectrics
Microwave Absorbing Elastomers & Films
Microwave Absorbing Foams
Molded, Machined, Cast Liquids and Microwave Absorbing Coatings
Sample Kits / Accessories

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.


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Introduction to Electrically Conductive Elastomers

The electrically conductive elastomers are based on dispersed particles in elastomers, oriented wire in solid or sponge elastomers, impregnated wire mesh screens or expanded metals. They provide highly conductive, yet resilient gasketing materials for EMI sealing as well as pressure and environmental sealing.

Corrosion of EMI Gaskets

Corrosion can manifest itself in many forms. Some common forms are galvanic, pitting, and crevice corrosion. However, galvanic corrosion is the major concern in shielding applications. Galvanic corrosion is driven by the interaction of the gasket and the electronic enclosure, since in a shielded joint there are often two dissimilar materials in intimate contact.

There are three conditions that must exist for galvanic corrosion to occur:

Laird Tech Notes: Theory and Application of RF/Microwave Absorbers

Absorbers in the RF/microwave realm are materials that attenuate the energy in an electromagnetic wave. Absorbers are used in a wide range of applications to eliminate stray or unwanted radiation that could interfere with a system’s operation. Absorbers can be used externally to reduce the reflection from or transmission to particular objects and can also be used internally to reduce oscillations caused by cavity resonance. They can also be used to recreate a free space environment by eliminating reflections in an anechoic chamber.

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