Open AccessMiniaturized full‐metal bandpass filter and multiplexer using circular spiral resonator
Author(s) -
Chen RuiSen,
Zhu Lei,
Wong SaiWai,
Lin JingYu,
Yang Yang,
Li Yin,
He Yejun
Publication year - 2021
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/mia2.12085
Subject(s) - multiplexer , resonator , band pass filter , diplexer , spiral (railway) , coupling (piping) , filter (signal processing) , materials science , electronic engineering , coupling coefficient of resonators , insertion loss , passband , miniaturization , optoelectronics , topology (electrical circuits) , engineering , multiplexing , electrical engineering , mechanical engineering , nanotechnology , metallurgy
This article proposes a new class of miniaturized full‐metal bandpass filters (BPFs) and multiplexers using circular spiral resonators (CSRs). The proposed metal CSR is supported on the metal cavity's wall, which serves as a short‐end resonator. This CSR has obvious size reduction compared to traditional cavity resonators and owns low insertion loss, high power capacity and high selectivity. Then, three BPFs using two, three and four CSRs are designed and analysed. All the proposed filters have transmission zeroes (TZs) produced by the source‐load coupling without introducing additional coupling structure. The proposed CSR is further used to design diplexer and quadruplexer. All the proposed filters have ultra‐compact size, especially, the size of quadruplexer is only 0.23 λ 0 × 0.081 λ 0 × 0.067 λ 0 . Finally, the fourth‐order filter and quadruplexer are fabricated and measured, the good agreement between the measured results and the simulated results validates the proposed design concepts.