Optimisation of a Stepped Permittivity Impedance Loaded (SPIL) Absorber

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 3Language: englishTyp: PDF

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Holtby, Daniel G.; Ford, Kenneth L.; Chambers, Barry (Department of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom)

A novel type of pyramidal absorber is presented. This absorber utilises a combination of impedance loading and an exponential stepped permittivity profile. The new design offers a significant improvement in the absorber’s low frequency performance when compared with existing pyramidal absorbers. Optimisation of the design’s parameters, using a PSO algorithm, has been carried out to maximise the absorber’s bandwidth at -40dB reflectivity.