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As a frequency-selective surface for dual-band antennas the gridded square provides a transmission region which lies below the reflection band and separated from it in frequency by a factor in the range 1·3 to about 2. A modal formulation of the element currents is presented. Features of the predicted plane-wave transmission response for TE and TM incidence at 45° and for normal incidence are compared with experimental results for a sample of 10 arrays. [ABSTRACT FROM AUTHOR]

Analyzes the frequency-selective surfaces on a biased ferrite substrate. Utilization of the full-wave moment method to solve the problem of frequency-selective surfaces (FSS) of biased ferrite slabs; Advantages of biased ferrite substrates over dielectric substrates; Effect of biasing the substrate on the resonant frequency of the FSS.