NDLI: Suspended resonators for filters-reduced /spl lambda//sub g/ excitation of evanescent cavities using high dielectric constant feedlines

Content Provider	IEEE Xplore Digital Library
Author	Snyder, R.V. Niver, E. Keehong Um Sanghoon Shin
Copyright Year	2002
Description	Author affiliation: RS Microwave, Butler, NJ, USA (Snyder, R.V.)
Abstract	A structure consisting of dielectric-loaded feed lines (such as surface wave lines similar to Goubau lines) and below-cutoff air-filled cavities can be used to form essentially L-C sections. The capacitance is due to electric field coupling from the feed line dielectric medium into the below-cutoff section. The inductance results from combining the inductors in the inductive tee-equivalent circuit for such below-cutoff sections. Dielectric loading is used to shorten the guide wavelength at the input to the evanescent section, increasing the effective input inductance. The dielectrically-loaded feed lines can comprise microstrip, CPW, CPS, Goubau lines (surface wave structures), waveguide, etc. The resulting resonant elements are usable at frequencies below 1 GHz, with small dimensions. If connected to the common ground plane, these L-C sections act as a transmission zero. If "floated", i.e. connected in the "hot" line rather than to the ground plane, the sections form bandpass circuits (transmission poles). The air-filled below-cutoff sections (evanescent mode) are placed in a supporting low-dielectric constant medium (air, Teflon or similar), with the open end in proximity to the dielectric portion of the feed line, and are thus termed "suspended".
Starting Page	1597
Ending Page	1600
File Size	388049
Page Count	4
File Format	PDF
ISBN	0780372395
ISSN	0149645X
DOI	10.1109/MWSYM.2002.1012162
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-06-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resonator filters Dielectrics Feeds Surface waves Inductance Capacitance Coupling circuits Inductors Microstrip Coplanar waveguides
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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