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Compact and wideband filters based on slotline‐perturbed quarter mode circular cavity substrate integrated waveguide
Author(s) -
Wang Xiang,
Zhu XiaoWei
Publication year - 2018
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21542
Subject(s) - passband , band pass filter , wideband , resonator , insertion loss , materials science , bandwidth (computing) , optoelectronics , center frequency , optics , physics , telecommunications , engineering
In this article, a series of compact and wideband quarter mode circular cavity (QMCC) substrate integrated waveguide (SIW) bandpass filters (BPFs) based on slotlines perturbation have been proposed. The proposed filters utilize quarter mode SIW cavities to reduce the profile of 75% comparing with the conventional SIW cavities. The C‐shaped and E‐shaped slotlines etched on the SIW cavities are used to broaden the bandwidth of the filters and improve the passband selectivity. Both the slotlines and SIW cavities can be regarded as resonators. In addition, extra metallic via‐hole loaded on the SIW cavities is applied to form a four‐order wideband bandpass filter with enhanced out‐of‐band rejection. To verify the principles mentioned above, the proposed bandpass filters are designed, fabricated, and measured in a standard printed circuit board (PCB) process. The QMCC SIW filters with E‐shaped slot and metallic via‐hole perturbation is measured at a central frequency (CF) of 5.76 GHz with a 3 dB fractional bandwidth (FBW) of 26.4%. Within the passband, the minimum insertion loss (IL) is <1.32 dB. The measured results show good agreements with the simulated ones.