Direct synthesis of a bandpass filter with a controllable transmission zero

Yu Chen Chen, Lung Kai Yeh, Huey-Ru Chuang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A novel bandpass filter with a controllable transmission zero located at the upper stopband is proposed. The circuit model and design equations are established. The location of the transmission zero can be adjusted by varying the shunt short-circuited stub of the resonators. Based on the coupled mechanism, the other transmission zero is created at the lower stopband by properly controlling the coupling strength of the coupled line. In this way, the proposed bandpass filter provides a better cutoff rate in the stopband and gives much improved selectivity. The illustrated filter with a center frequency of 2.4 GHz has an insertion loss of less than 2 dB and a return loss of more than 15 dB. The transmission zeros are located at 2.1 GHz and 3 GHz. A good agreement between the simulated and measured results is obtained.

Original languageEnglish
Title of host publication2010 Asia-Pacific Microwave Conference Proceedings, APMC 2010
Pages1962-1965
Number of pages4
Publication statusPublished - 2010 Dec 1
Event2010 Asia-Pacific Microwave Conference, APMC 2010 - Yokohama, Japan
Duration: 2010 Dec 72010 Dec 10

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC

Other

Other2010 Asia-Pacific Microwave Conference, APMC 2010
CountryJapan
CityYokohama
Period10-12-0710-12-10

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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  • Cite this

    Chen, Y. C., Yeh, L. K., & Chuang, H-R. (2010). Direct synthesis of a bandpass filter with a controllable transmission zero. In 2010 Asia-Pacific Microwave Conference Proceedings, APMC 2010 (pp. 1962-1965). [5728354] (Asia-Pacific Microwave Conference Proceedings, APMC).