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A compact microstrip λ/4-SIR interdigital bandpass filter with extended stopband
Hoi-Kai Pang1; Ka-Meng Ho1; Kam-Weng Tam1; R.P. Martins1,2
2004-10-08
Conference Name2004 IEEE MTT-S International Microwave Symposium Digest
Source PublicationIEEE MTT-S International Microwave Symposium Digest
Volume3
Pages1621-1624
Conference Date6-11 June 2004
Conference PlaceFort Worth, TX, USA
Abstract

This paper presents a new microstrip interdigital bandpass filter using /spl lambda//4 stepped impedance resonator (SIR) to achieve both size reduction and stopband extension. It is shown that as the low-impedance to high-impedance ratio is maintained smaller than unity, fundamental f/sub 0/ and the first spurious f/sub s/ shift to the lower and higher frequency value respectively, thus extending the rejection band, as in the case of /spl lambda//2-SIR. Unequal lengths spurlines are embedded into the resonators where additional transmission zeros can be realized in the spurious passband such that the upper rejection band can be further extended. A 3/sup rd/ order Butterworth bandpass filter centered at 700MHz with spurious response up to 4f/sub 0/ is simulated and measured to demonstrate the proposed design usefulness.

KeywordMicrostrip Microwave Filter Spurious Response Spurline Stepped Impedance Resonator
DOI10.1109/MWSYM.2004.1338893
URLView the original
Scopus ID2-s2.0-4544312044
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Faculty of Science and Technology
Affiliation1.Wireless Communication Laboratory, Faculty of Science and Technology, University of Macau, Macau SAR, China
2.on leave from Instituto Superior Tbcnico, Lisbon, Portugal
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Hoi-Kai Pang,Ka-Meng Ho,Kam-Weng Tam,et al. A compact microstrip λ/4-SIR interdigital bandpass filter with extended stopband[C],2004:1621-1624.
APA Hoi-Kai Pang,Ka-Meng Ho,Kam-Weng Tam,&R.P. Martins.(2004).A compact microstrip λ/4-SIR interdigital bandpass filter with extended stopband.IEEE MTT-S International Microwave Symposium Digest,3,1621-1624.
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