High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband | Zendy

Weiqiang Pan | Zendy; Xiao-Lan Zhao | Zendy; Yao Zhang | Zendy; JinXu Xu | Zendy

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High Selectivity Dual-Band Bandpass Filter with Tunable Lower Passband

Author(s) -

Weiqiang Pan,

Xiao-Lan Zhao,

Yao Zhang,

JinXu Xu

Publication year - 2015

Publication title -

international journal of antennas and propagation

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.282

H-Index - 37

eISSN - 1687-5877

pISSN - 1687-5869

DOI - 10.1155/2015/762504

Subject(s) - passband , band pass filter , resonator , bandwidth (computing) , electronic engineering , interference (communication) , materials science , computer science , optoelectronics , engineering , telecommunications , channel (broadcasting)

This paper presents a novel method to design dual-band bandpass filters with tunable lower passband and fixed upper passband. It utilizes a trimode resonator with three controllable resonant modes. Discriminating coupling is used to suppress the unwanted mode to avoid the interference. Varactors are utilized to realize tunable responses. The bandwidth of the two bands can be controlled individually. Transmission zeros are generated near the passband edges, resulting in high selectivity. For demonstration, a tunable bandpass filter is implemented. Good agreement between the prediction and measurement validates the proposed method

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