NDLI: Bandpass–Bandstop Filter Cascade Performance Over Wide Frequency Tuning Ranges

Content Provider	IEEE Xplore Digital Library
Author	Naglich, E.J. Juseop Lee Peroulis, D. Chappell, W.J.
Copyright Year	1963
Abstract	A tunable, substrate integrated, high Q bandpass-bandstop filter cascade is demonstrated that is capable of providing up to 100 dB of isolation between two dynamically selectable frequencies of interest. Evanescent-mode cavity filters are used in the cascade to allow high quality factors and wide tuning ranges. It is shown that it is theoretically possible to tune the cascade circuit's passband and transmission nulls independently over more than an octave in frequency while displaying good performance. General coupling matrix theory, ABCD matrix theory, and measurements are shown that describe the behavior of the filter cascade over the entire frequency tuning range. The high, dynamic isolation provided by cascade circuits has potential to be useful in concurrent transmit-receive systems, shared aperture systems, and spectral environments with strong co-site interference.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	3945
Ending Page	3953
Page Count	9
File Size	1452696
File Format	PDF
ISSN	00189480
Volume Number	58
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Couplings Power transmission lines Transmission line matrix methods Tuning Resonant frequency Filtering theory Passband tunable resonators Filters microwave filters passive filters tunable filters
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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