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Gallery: Cool circuits in evidence at the 2015 International Microwave Symposium

May 27, 2015 By Lee Teschler

When you need to absorb microwaves

microwave absorbersThese are samples of material from Wavexorb which, depending on the electromagnetic properties, can either serve as an absorber or a reflector of electromagnetic radiation. The dielectric and magnetic losses and their dependence on frequency results in the absorption and/or scattering of electromagnetic waves. For example, a good absorber material might have numerically equal values of complex permeability and permittivity (for an impedance match with air) and high loss tangents (for rapid attenuation) over a wide frequency range. There are a variety of materials, but most use either a carbon-loaded silicone (left) or foam (center) material. Narrowband absorbers, also known as tuned frequency or resonant frequency absorbers, are generally a layer of silicone that resonates at a specified frequency. They absorb microwave energy that is ± 10% of the resonant frequency which is generally between 2 and 18 GHz. The other sample is a polyether reticulated foam loaded with carbon. It is used for absorbing a broad band of frequencies.
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