Design of Chebyshev Bandpass Waveguide Filter for E-Band Based on CSRR Metamaterial

Abstract

AbstractA waveguide bandpass filter (WBPF) based on the Chebyshev response that operates in the E-band system for downlink channel [71 GHz–76 GHz] at 73.5 GHz resonant frequency has been designed and simulated. The new design of the WBPF used complementary split-ring resonators (CSRRs) that both rings are located transversely on the metallic sheet. Lumped circuit of the filter has been implemented and discussed as well. The circuit of the prospective bandpass filter has been designed and demonstrated via electromagnetic full-wave simulator CST. By selecting proper physical dimensions of CSRRs, a shortened physical length, a flat and lossless passband, and better return loss rather than the traditional waveguide filter. Subsequently, the proposed waveguide BPF and the traditional WBPF which coupled with inductive H-plane resonators have been compared at the same resonant frequency 73.5 GHz. The new waveguide bandpass filter shortened the physical length of WBPF by \(37.5\%\) and boosted the return loss up to \(6.7\%\).KeywordsMicrowave filterMetamaterialsWaveguideResonatorsE-band