volume | PIER Journals

2010-05-05

Compact Quintuple-Mode UWB Bandpass Filter with Good Out-of-Band Rejection

Hong-Wei Deng,

Dr. Hong-Wei Deng

College of Information Science and Technology

Nanjing University of Aeronautics and Astronautics

China

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Yong-Jiu Zhao,

Dr. Yong-Jiu Zhao

College of Information Science and Technology

Nanjing University of Aeronautics and Astronautics

China

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Xue-Shun Zhang,

Dr. Xue-Shun Zhang

College of Information Science and Technology

Nanjing University of Aeronautics and Astronautics

China

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Lu Zhang,

Dr. Lu Zhang

College of Information Science and Technology

Nanjing University of Aeronautics and Astronautics

China

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Si-Ping Gao

Mr. Si-Ping Gao

College of Information Science and Technology

Nanjing University of Aeronautics and Astronautics

China

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Progress In Electromagnetics Research Letters, Vol. 14, 111-117, 2010

doi:10.2528/PIERL10030912

Abstract

In this paper, a novel compact quintuple-mode UWB bandpass filter (BPF) with sharp rejection skirt and wide upper-stopband performances is realized using stub-loaded multiple-mode resonator (MMR). The proposed resonator is formed by attaching two pairs of circular impedance-stepped open stubs in shunt and a pair of short-circuited stubs to high impedance microstrip line. By simply adjusting the radius of circular impedance-stepped open stubs and the lengths of short-circuited stubs, the first five resonant modes of the resonator can be roughly allocated within the 3.1--10.6 GHz UWB band meanwhile the high resonant modes in the upper-stopband can be suppressed. The short stubs in pairs can generate two transmission zeros near the lower and upper cut-off frequencies, leading to sharper rejection skirt outside the desired passband. Finally, a quintuple-mode UWB BPF is designed and fabricated, and the measured results demonstrate the feasibility of the design process.

Citation

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Hong-Wei Deng, Yong-Jiu Zhao, Xue-Shun Zhang, Lu Zhang, and Si-Ping Gao, "Compact Quintuple-Mode UWB Bandpass Filter with Good Out-of-Band Rejection," Progress In Electromagnetics Research Letters, Vol. 14, 111-117, 2010.
doi:10.2528/PIERL10030912

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