Y. Miura, J. Hirokawa, M. Ando, Y. Shibuya, G. Yoshida
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Bandwidth of a four-aperture element for a double-layer corporate-feed hollow-waveguide slot array
The four-aperture element for the double-layer corporate-feed hollow waveguide slot array has reflection below −15dB over 9.5% bandwidth assuming the mutual couplings by the periodic boundary walls.