Computation of the Q Limits for Arbitrary-Shaped Antennas Using Characteristic Modes
Jeffrey Chalas, Kubilay Sertel and John L. Volakis
ElectroScience Laboratory, The Ohio State University
Fundamental limits on the Q-factor for arbitrary-shaped PEC antennas are presented using the theory of characteristic modes. A formula for computing the Q of an arbitrary-shaped PEC antenna with an impressed current mode is derived, and is used to find minimum-Q bounds. It is shown that minimum bounds on small antenna Q can be determined simply through an eigenmode analysis of the Method of Moments impedance matrix representing the antenna geometry. The presented Q limits are then compared with those in the literature for several common geometries.
IEEE Antennas and Propagation Society International Symposium (APSURSI)
2011
July
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