Computation of the Q limits for arbitrary-shaped antennas using characteristic modes

Author

Chalas, Jeffrey ; Sertel, Kubilay ; Volakis, John L.

Author_Institution

ElectroSci. Lab., Ohio State Univ., Columbus, OH, USA

fYear

2011

fDate

3-8 July 2011

Firstpage

772

Lastpage

774

Abstract

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.

Keywords

Q-factor; antennas; eigenvalues and eigenfunctions; impedance matrix; method of moments; Q limits; Q-factor; antenna geometry; arbitrary-shaped PEC antennas; arbitrary-shaped antennas; characteristic modes; eigenmode analysis; method of moments impedance matrix; Approximation methods; Dipole antennas; Geometry; Impedance; Moment methods; Q factor; Characteristic modes; Q; fundamental limits; miniaturization; quality factor;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation (APSURSI), 2011 IEEE International Symposium on

Conference_Location

Spokane, WA

ISSN

1522-3965

Print_ISBN

978-1-4244-9562-7

Type

conf

DOI

10.1109/APS.2011.5996827

Filename

5996827