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A compact triple‐mode bandpass filter based on isosceles right‐angled triangular resonator
Author(s) -
Zhang Qiao,
Chen Chang,
Ji Qin,
Chen Weidong,
Zhang Hualiang
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32347
Subject(s) - isosceles triangle , band pass filter , insertion loss , passband , resonator , return loss , center frequency , filter (signal processing) , bandwidth (computing) , helical resonator , physics , optics , materials science , acoustics , telecommunications , engineering , electrical engineering , antenna (radio) , mathematics , geometry
In this letter, a triple‐mode bandpass filter based on isosceles right‐angled triangular (RAT) resonator with three magnetic walls is proposed. To realize the triple‐mode filter, the RAT resonator is perturbed by two metalized via‐holes around the center. These via‐holes form an LC resonant unit with the patch. Also, the via‐holes make mode shifting of the TM 010 Z mode while not affecting the TM 110 Z mode in order to form the passband. The proposed filter is fabricated and measured. The center frequency is 5.51 GHz and the fractional bandwidth is 20%. The minimum in‐band insertion loss and return loss are measured to be 1.26 dB and 20.5 dB. The measurement results show that the filter has featured both compact size and excellent in‐band responses.