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- Title
A Triple-mode Passband Filter with Improved Upper-stopband Performance.
- Authors
Huan Yang; Shao-Bin Liu; Xiang-Kun Kong; Hui-Chao Zhao; Bo-Rui Bian
- Abstract
In this letter, a high selectivity microstrip bandpass filter (BPF) with loaded stubs is proposed. This filter consists of a half-wavelength transmission line with two different open-ended stubs at the line center. Compared with conventional uniform stub, the circular impedance-stepped stub can improve the performance of the upper-stopband. This filter can generate three operation modes, which can be easily adjusted individually. Owing to the symmetrical structure of it, we can use the odd-even-mode method to analysis it. When the coupling is weak, the even-modes frequency can be flexibly controlled by the open-ended stubs. Due to the two unsymmetrical stubs, two transmission zeros are brought out at low and high rejection bands, which is leads to high selectivity. Simulated results show that central frequency is 6.3 GHz with 3-dB fractional bandwidth of 49%. Its upper-stopband is extended 8.4-16.7 GHz with a rejection level of about -25 dB.
- Subjects
BANDPASS filters; ELECTRIC lines; ELECTRIC filters; BANDWIDTHS; WAVELENGTHS
- Publication
PIERS Proceedings, 2013, p217
- ISSN
1559-9450
- Publication type
Article