Abstract
In this paper, we propose the design of multilayer frequency selective surfaces (FSS) waveguide band-pass fllters (WBPF). The WBPFs are designed to operate at two difierent frequency channels, respectively 71{76GHz (Rx) and 81{86GHz (Tx). The cross section surface of the FSS is imposed by the WR12 waveguide rectangular section's dimensions. The WBPFs are inserted symmetrically in a T-junction waveguide to design a compact diplexer. This is a basic component developed for an e-cient integration in the future E-band millimeter-wave transceiver. The multilayer FSS structure uses only non-resonant sub-wavelength unit cell elements; metallic patch and slot. To reach high channel isolation (… 70dB) a seven order fllter was required. Hence, each fllter is composed of 13 capacitive and inductive metallic FSS spaced by 12 ultra-thin dielectric substrate layers. The dielectric material is Rogers Ultralam 3850 (Liquid Crystalline Polymer; LCP circuit material). The fllter's overall thickness is < ‚=4. The numerical studies have been performed using flnite element method simulator (HFSS) and CST Studio Suites Tools. The experimental validation has been also done in the X band frequency by developing a flfth order FSS WBPF. Good agreements between simulated and measured results are obtained.
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