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- Title
Compact bandstop filters using coupled lines and open/short stubs with multiple transmission poles.
- Authors
Yijun Cai; Kai Da Xu; Zhewang Ma; Yanhui Liu
- Abstract
A compact bandstop filter (BSF) using parallel-coupled lines and open stubs with four transmission poles (TPs) is proposed. Through theoretical equation deduction, the positions of these four TPs can be obtained. Good roll-off skirts and stopband suppression characteristics of the BSF can be realised with the help of multiple TPs. To improve transition band roll-off rates, another BSF with five TPs is designed, where a short-circuited T-stub is loaded on the middle of the above BSF circuit structure. For demonstration, two filter examples with centre frequencies at 2 and 1.8 GHz are implemented with generation of four and five TPs, respectively, for theoretically calculated certification. Good agreement between simulated and measured results validates the design method.
- Subjects
FILTERS &; filtration; POLISH people; SKIRTS
- Publication
IET Microwaves, Antennas & Propagation (Wiley-Blackwell), 2019, Vol 13, Issue 9, p1368
- ISSN
1751-8725
- Publication type
Article
- DOI
10.1049/iet-map.2018.5745