A D-band extracted pole waveguide bandpass filter based on TE202 and TE301 resonator

Abstract

This paper presents a D-band waveguide bandpass filter (BPF) with high selectivity based on extracted pole technology. Unlike a single transmission zero (TZ) in the traditional design, the basic structure of the proposed extracted pole resonator is the novel TE202 and TE301 resonator, which provides two TZs. In which, each TZ position can be independently controlled by adjusting the dimensions of the resonant cavity. As an illustrative example, a pseudo-elliptic waveguide filter with two pairs of TZs generated on both sides of the passband using the extracted pole resonator and two dual-mode cavities. The filter is fabricated using high-precision computer numerical control (CNC) milling technology. The strong agreement between measured and simulated results validates the enhanced selectivity of the filter achieved by this novel extracted pole resonator.