volume | PIER Journals

2015-10-22

A Novel Method from Bandpass to Dual-Band for Microwave Filter and Diplexer Design

Feng Qiu,

Mr. Feng Qiu

Gospell Joint Lab of Microwave Communication Technology

Xiangnan University

China

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Zhenhua Tang,

Dr. Zhenhua Tang

Gospell Joint Lab of Microwave Communication Technology

Xiangnan University

China

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Jian-Quan Huang,

Dr. Jian-Quan Huang

School of Electronic and Information Engineering

South China University of Technology

China

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Dajun Lei,

Dr. Dajun Lei

Gospell Joint Lab of Microwave Communication Technology

Xiangnan University

China

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Ming Yao

Dr. Ming Yao

Gospell Joint Lab of Microwave Communication Technology

Xiangnan University

China

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Progress In Electromagnetics Research Letters, Vol. 57, 65-71, 2015

doi:10.2528/PIERL15080601

Abstract

A novel method for a dual-band filter and quad-channel diplexer design is presented in this paper. This method, by altering the gap between resonators, realizes a transformation from bandpass to dual-band for the filter and diplexer. At first, a high selectivity bandpass filter (BPF) with four controllable transmission zeros (TZs) is designed. Then altering the gap between resonators, a band gap is generated and utilized to split the passband of the proposed BPF into two bands, which transforms the BPF to a dual-band filter with narrow passband separation. The center frequency and bandwidth of the new dual-band filter are controllable by adjusting the frequency and width of band gap. Based on the dual-band filter, a quad-channel diplexer with stepped impedance T-junction is designed, and it can be transformed to a wideband diplexer. For demonstration, the dual-band filter and quad-channel diplexer are fabricated and measured.

Citation

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Feng Qiu, Zhenhua Tang, Jian-Quan Huang, Dajun Lei, and Ming Yao, "A Novel Method from Bandpass to Dual-Band for Microwave Filter and Diplexer Design," Progress In Electromagnetics Research Letters, Vol. 57, 65-71, 2015.
doi:10.2528/PIERL15080601

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