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- Title
Single- and Dual-Band Bandpass Filters Based on a Novel Microstrip Loop-Type Resonator Loaded with Shorted Stubs.
- Authors
Jun-Mei Yan; Bao-Jie Kang; Yong Yang; Liangzu Cao
- Abstract
A novel microstrip loop-type resonator with four resonant modes is proposed in this letter. The resonator is formed by a loop-type microstrip line loaded with four shorted stubs. It has a symmetrical structure, thus the odd-even-mode method is adopted to implement the resonant analysis. The novelty of the proposed resonator lies in two aspects. One is that its resonant frequencies can be adjusted in a more flexible way. The other is that its resonant modes have a uniform electromagnetic field distribution, which is beneficial for the excitation of resonant modes. For the purpose of demonstration, based on the novel resonator, a single-band bandpass filter with four transmission poles and a dual-band bandpass filter with two transmission poles in each passband are constructed. Additionally, sourceload cross coupling is introduced, and several transmission zeros are generated in the stopband, which improves the out-of-band performance greatly. The designed single-band filter has the central frequency of 2.4 GHz and fractional bandwidth (FBW) of 4.5%, and the dual-band filter has the central frequency of 1.8/2.4 GHz and fractional bandwidth of 2.0%/2.5%. The two bandpass filters are designed, fabricated, and measured. Agreement between the simulated and measured results verifies the effectiveness of the proposed resonator and filters.
- Subjects
BANDPASS filters; MICROSTRIP resonators; RESONATOR filters; MICROSTRIP transmission lines; TRANSMISSION zeros; ELECTROMAGNETIC fields
- Publication
Progress in Electromagnetics Research Letters, 2023, Vol 113, p61
- ISSN
1937-6480
- Publication type
Article
- DOI
10.2528/pierl23083105