A wideband CPS bandpass filter with ultra-wide upper stopband using stepped-impedance rat-race hybrid couplers

Chun Hsiang Chi*, Chi-Yang Chang

*Corresponding author for this work

研究成果: Conference contribution同行評審

4 引文 斯高帕斯(Scopus)

摘要

A wideband coplanar strip (CPS) bandpass filter using two 3-dB stepped-impedance rat-race hybrid couplers is proposed in this paper. The stepped-impedance structure results in both ultra-wide upper stopband and size reduction. The low impedance and high impedance CPS lines are realized using the interdigital structure for low impedance and conventional structure for high impedance, respectively. The ideal phase inverter has been implemented with hybrid CPS/interdigital CPS structure. Experimental results show that this 2-GHz fifth order filter depicts a 10-dB return loss bandwidth of 100% and upper stopband rejection levels of better than -40dB up to 17.5 GHz. This proposed filter achieves wide passband and ultra-wide stopband performance simultaneously. This filter is fabricated using CPS on 15-mil Al 2O3 substrate with a dielectric constant of 9.8. The measured results agree well with the simulated results.

原文English
主出版物標題2007 IEEE MTT-S International Microwave Symposium Digest
頁面735-738
頁數4
DOIs
出版狀態Published - 2 十月 2007
事件2007 IEEE MTT-S International Microwave Symposium, IMS 2007 - Honolulu, HI, United States
持續時間: 3 六月 20078 六月 2007

出版系列

名字IEEE MTT-S International Microwave Symposium Digest
ISSN(列印)0149-645X

Conference

Conference2007 IEEE MTT-S International Microwave Symposium, IMS 2007
國家United States
城市Honolulu, HI
期間3/06/078/06/07

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