NDLI: Microstrip wiggly-line bandpass filters with multispurious rejection

Content Provider	IEEE Xplore Digital Library
Author	Lopetegi, T. Laso, M.A.G. Falcone, F. Martin, F. Bonache, J. Garcia, J. Perez-Cuevas, L. Sorolla, M. Guglielmi, M.
Copyright Year	2001
Abstract	A method to achieve the rejection of multiple spurious passbands in parallel-coupled-line microstrip bandpass filters is proposed. As it was previously demonstrated by the authors, using a continuous perturbation of the width of the coupled-lines following a sinusoidal law, the wave impedance can be modulated so that the first undesired harmonic passband of the filter is rejected, while the desired passband is maintained virtually unaltered. In this letter, the scope of the method is extended to reject multiple spurious passbands by employing different periods in each coupled-line section tuned to the different bands to be rejected. Simulated and measured data show that for an order-seven bandpass filter prototype, a rejection level exceeding 30 dB is obtained in the first four spurious passbands, while the desired pass-band is kept almost unaltered.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	531
Ending Page	533
Page Count	3
File Size	236432
File Format	PDF
ISSN	15311309
Volume Number	14
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microstrip filters Band pass filters Passband Power harmonic filters Periodic structures Impedance Transmission line measurements Virtual prototyping Couplings Stripline spurious suppression Bandpass filter coupled-line filter microstrip
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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