Miniaturized dual‐mode sector patch bandpass filter using a single via‐hole

Abstract

A miniaturized dual-mode sector patch bandpass filter using a single via-hole is presented in this article. Only a single 11.25 sector patch resonator, which is one-thirtysecond of the complete circular patch resonator, is utilized to miniaturize the filter for the first time. Without changing the size and construction of the initial patch, a simple via-hole is used to perturb the patch resonator, thus the novel dominant mode, which provides further compactness is generated. In addition, the change of viahole position is utilized to expand the bandwidth and significantly enhance the flexibility of the filter. Moreover, the proposed filter possesses two transmission zeros and it has obvious advantages of low insertion loss, compact size, and wide passband.

Highly‐selective microstrip bandpass filters based on new dual‐mode fan‐shape patch resonators

“…A miniaturised dual‐mode sector patch BPF using a single via‐hole as perturbation structure is presented in ref. [16].…”

“…A miniaturised dual-mode sector patch BPF using a single via-hole as perturbation structure is presented in ref. [16].According to the aforementioned literatures, apart from designing dual-mode resonators through cascaded single-mode resonators [15], most of microstrip dual-mode patch filters can be designed and achieved by square, triangular, loop, circular, tapered and fan-shape resonators, which support a pair of degenerate modes [1,17]. In order to split and couple two degenerate modes, an extra perturbation element must be introduced along the orthogonal plane of a resonator in aThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.…”