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- Title
Novel Tri-Band Bandpass Filter with High Selectivity.
- Authors
Liangzu Cao; Lixia Yin
- Abstract
This paper presents a tri-band bandpass filter (BPF) consisting of a wide BPF and two narrow bandstop filters (BSFs). BPF is a ninth-order interdigital structure, and BSFs are designed fifthorder series resonators with quarter wavelength transmission line connected. The selectivity of BPF and the bandwidth of BSF are analyzed using simulation software. A tri-band BPF, made of metal cavities, is designed and measured. Three passbands are located in 1.332~1.401 GHz, 1.443~1.458 GHz, 1.506~1.660 GHz, and insertion losses in passbands are less than 2.1 dB. Ratios of Δf40dB/Δf3dB are 1.9, 2.67 and 1.33, respectively, and isolation between passbands is more than 75 dB. The good agreement between the simulated and measured results validated the proposed structure.
- Subjects
BANDPASS filters; WAVELENGTH measurement; RESONATORS; BANDWIDTH research; WIRELESS communications equipment
- Publication
Progress in Electromagnetics Research Letters, 2015, Vol 51, p127
- ISSN
1937-6480
- Publication type
Article
- DOI
10.2528/pierl14121302