volume | PIER Journals

2014-09-07

Dual-Band Bandpass Filter with Independently Tunable Passbands and Wide Stopband

Ying Fang Guo,

Dr. Ying Fang Guo

National Laboratory of Science and Technology on Antennas and Microwaves

Xidian University

P.R. China

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Feng Wei,

Prof. Feng Wei

Xidian University

China

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Ming Zhong Lin,

Dr. Ming Zhong Lin

National Key Laboratory of Science and Technology on Antennas and Microwaves

Xidian University

China

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Xiao-Wei Shi

Professor Xiao-Wei Shi

School of Electronics Engineering

Xidian University

China

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Progress In Electromagnetics Research Letters, Vol. 49, 1-8, 2014

doi:10.2528/PIERL14062603 | Google Scholar

Abstract

This paper presents a dual-mode stub loaded ring resonator (SLRR) to design a tunable dual-band bandpass filter (BPF) with two independently controllable passbands. The proposed resonator principally comprises a stepped-impedance ring resonator (SIRR) loaded with three stubs and two varactor diodes. Two independently tunable passbands are implemented by employing two varactors to control the dominant even-mode resonant frequency and odd-mode resonant frequency, respectively. Moreover, a new stub loaded double-ring resonator (SLDRR) is proposed to design the second tunable dual-band filter by shorting two stubs of the SLRR. With the same tuning method, the second filter can achieve two independently controllable passbands. In order to suppress the harmonics, defected ground structures (DGSs) are introduced at input and output feeding lines without degrading the passbands characteristics. The simulated and measured results are found in good agreement with each other.

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Ying Fang Guo, Feng Wei, Ming Zhong Lin, and Xiao-Wei Shi, "Dual-Band Bandpass Filter with Independently Tunable Passbands and Wide Stopband," Progress In Electromagnetics Research Letters, Vol. 49, 1-8, 2014.
doi:10.2528/PIERL14062603

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