4.6 Article

W-Band Bandpass Filter Using Spoof Surface Plasmon Polaritons and Double-Grating Rectangular Waveguide

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWT.2023.3301466

Keywords

Bandpass filter (BPF); periodic structure; rect-angular waveguide (RWG); spoof surface plasmon polariton (SSPP)

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A hybrid circuit combining spoof surface plasmon polaritons (SSPPs) and double-grating rectangular waveguide (DG-RWG) is proposed for designing a tunable bandwidth bandpass filter (BPF) operating at W-band. The dispersion curves of the SSPP-RWG and DG-RWG are analyzed, and the cut-off frequencies can be independently controlled by changing the geometric parameters. A W-band RWG BPF is designed and fabricated, with a measured bandwidth from 80.1 to 93.8 GHz and low insertion loss of about 0.57 dB at the center frequency.
A hybrid circuit with spoof surface plasmon polaritons (SSPPs) and double-grating rectangular waveguide (DG-RWG) is proposed to design a bandpass filter (BPF) operating at W-band. The proposed SSPPs consisting of corrugated metallic blocks are embedded into the RWG, which forms a hybrid SSPP-RWG. Both the dispersion curves of the SSPP-RWG and DG-RWG are analyzed. The lower cut-off frequency of DG-RWG and the upper cut-off frequency of SSPP-RWG can be controlled independently by changing their geometric parameters, thus the hybrid circuit composed of DG-RWG and SSPP-RWG is attractive to design a BPF with tunable bandwidth. For demonstration, a W-band RWG BPF is designed and fabricated with measured bandwidth from 80.1 to 93.8 GHz, which agrees well with that in the dispersion curves. The BPF has a low insertion loss of about 0.57 dB at the center frequency.

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