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Closed form expressions for the resonant frequencies of circular and annular ring microstrip antennas

Sriram, S and Vedavathy, TS (1998) Closed form expressions for the resonant frequencies of circular and annular ring microstrip antennas. In: National Symposium on Antennas and Propagation: APSYM '98, 15-16 Dec. 1998, Cochin, India, pp. 79-83.

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Abstract

The conformal mapping technique (CMT) is effectively utilized in obtaining exactly the effective dielectric constant of a multilayer dielectric structure of microstrip transmission lines. By proper transformation, the CMT is employed in deriving the closed form expressions for the resonant frequencies of such a multilayer dielectric structure of microstrip patches of circular geometry, i.e., disc and annular ring patch antennas. These correspond to the dominant mode of resonance, namely the $TM_{11}$ mode. This paper presents the application of this technique in determining the closed form expressions for the resonant frequencies of higher order modes as well. The formula for resonant frequency is modified to include a mode ratio, which works on the characteristic equation of the patches of circular geometry as processed by the cavity model. Thus, an effective, simple and straightforward approach in evaluating the resonant frequencies of various modes of complex structures with multilayer dielectric of circular geometry has been proposed. Comparing them with the experimental and published results validates the results thus obtained

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Cochin University of Science and Technology.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 28 Jun 2007
Last Modified: 27 Aug 2008 12:40
URI: http://eprints.iisc.ernet.in/id/eprint/10073

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