An Absorbing Structure Covering the Whole UHF Band
An ultra-wideband absorbing structure coving the whole ultra-high frequency(UHF)band is provided in this paper.The permeabilities of magnetic materials increase with the decrease of frequency.Therefore,the absorber is less susceptible to frequency.The performance of the absorber at low frequencies is further improved by introducing resistive loss.The permittivity and permeability of carbonyl iron powder are measured by vector network analyzer,the equivalent circuit parameters are optimized by genetic algorithm,and the structure parameters are optimized by full-wave EM simula-tor,all in whole UHF band.The absorber is measured at low frequencies.The measured,simulated,and equivalent circuit results show a good agreement.The absorber presents an absorption rate over 90%within a fractional absorption band-width over 164%,and it has a thickness of 0.029λ at the lowest frequency.
absorbing structureUHF bandultra-widebandcarbonyl iron powdergenetic algorithm
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