Microwave Absorbing Elastomers
Q-Zorb™ 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 0.015” to 0.125” (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 corrosion-resistant 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 to ease installation. 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
- Use inside of microwave housings to reduce internal resonance and lower the "Q" of the microwave cavity
- Effective in isolating antennas from ground plane reflections
- Can be used with board level shielding and other EMI shields to enhance shielding effectiveness at frequencies from 2 - 40 GHz
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