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- Title
Compact low-pass filters with deep and ultrawide stopband using tri- and quad-mode resonators.
- Authors
Qun Li; Yonghong Zhang; Daotong Li; Kaida Xu
- Abstract
On the basis open stub-loaded tri- and quad-mode resonators, two compact microstrip low-pass filters (LPFs) with deep and ultra-wide stopband are presented. Modal characteristics of the tri- and quad-mode resonators are analysed by even-odd-mode method. Multimode resonator can be modelled as multiple LC resonant circuits and the lumped-element equivalent circuit models of the proposed LPFs are presented. The tri- and quad-mode resonators have strong slow-wave and bandstop effects, which can achieve ultra-wide and deep stopband and size reduction in the design of LPFs. For the proposed low-pass filter using tri-mode resonators, the 3 dB cutoff frequency is 2.5 GHz and the stopband with 40 dB suppression is from 4.5 to 17.7 GHz. The low-pass filter based on quad-mode resonators has a 3 dB cutoff frequency of 2.2 GHz and the stopband with 30 dB suppression is from 4.1 to 18 GHz.
- Subjects
LOWPASS electric filters; ELECTRIC resonators; BANDWIDTHS; THEORY of wave motion; ELECTRIC circuit design &; construction
- Publication
IET Microwaves, Antennas & Propagation (Wiley-Blackwell), 2017, Vol 11, Issue 5, p743
- ISSN
1751-8725
- Publication type
Article
- DOI
10.1049/iet-map.2016.0466