INDEPENDENTLY-TUNED DUAL-BAND FILTER USING VARACTOR-LOADED RESONATORS | Zendy

Xiu Yin Zhang | Zendy; Li Gao | Zendy; Yunfei Cao | Zendy; Xiao-Lan Zhao | Zendy; Yong Ding | Zendy

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INDEPENDENTLY-TUNED DUAL-BAND FILTER USING VARACTOR-LOADED RESONATORS

Author(s) -

Xiu Yin Zhang,

Li Gao,

Yunfei Cao,

Xiao-Lan Zhao,

Yong Ding

Publication year - 2013

Publication title -

progress in electromagnetics research c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.341

H-Index - 34

ISSN - 1937-8718

DOI - 10.2528/pierc13052908

Subject(s) - varicap , resonator , multi band device , dual (grammatical number) , filter (signal processing) , materials science , electronic engineering , optoelectronics , acoustics , electrical engineering , physics , engineering , capacitance , art , electrode , quantum mechanics , literature , antenna (radio)

This paper presents a high-selectivity dual-band bandpass fllter with independently-tunable passband frequencies. A tap-coupled structure is utilized to feed the two resonators at lower passband and a coupling structure is used to feed the two resonators at the upper passband. Two pairs of varactor-loaded resonators operating within two difierent frequency ranges, allow the independent passband frequency tuning. Using this conflguration, it is convenient to tune the center frequency of each passband, while the responses of the other passband remain unaltered. Source-load coupling is realized to generate transmission zeros, resulting in high skirt-selectivity. The transmission zeros move synchronously with the passbands, ensuring sharp roll-ofi rate for all tuning states. To verify the proposed idea, a demonstration microstrip tunable bandpass fllter is implemented. The simulated and measured results are presented.

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