Open AccessHigh‐selective triple‐mode SIW bandpass filter using higher‐order resonant modes
Author(s) -
Liu Qing,
Zhou Dongfang,
Shi Jian,
Hu Tao
Publication year - 2020
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.3234
Subject(s) - band pass filter , resonator , bandwidth (computing) , filter (signal processing) , q factor , insertion loss , materials science , optics , optoelectronics , physics , engineering , telecommunications , electrical engineering
A novel high‐selective triple‐mode substrate integrated waveguide (SIW) bandpass filter using higher‐order resonant modes is proposed in this Letter. The new triple‐mode SIW resonator is realised by the second degenerate dual modes TM 210 and one perturbed higher‐order mode TM 020 in a circular SIW cavity. The resonance of TM 020 mode can be independently moved to that of dual modes TM 210 by changing the size of a floating circular patch. The proposed triple‐mode SIW filter can produce three finite‐transmission zeros (FTZs), which can also be controlled well by the angle between two feeding lines. For the demonstration, a triple‐mode SIW filter with the centre frequency of 13.5 GHz was designed, fabricated and measured. The proposed triple‐mode circular SIW filter has the merits of the high‐quality factor, high selectivity and controllable bandwidth as well as FTZs.