Study of the total Q of antennas in terms of modal Qn provided by Characteristic Modes Theory

Author

Elghannai, Ezdeen A. ; Rojas, Roberto G.

Author_Institution

Dept. of Electr. & Comput. Eng., Ohio state Univ., Columbus, OH, USA

fYear

2014

fDate

6-11 July 2014

Firstpage

49

Lastpage

50

Abstract

An expression of the total radiation Q in terms of the Q_n of characteristic modes for an arbitrary antenna is presented. The theory of Characteristic Modes (CM) was used to expand the total Q in terms of Q_n (quality factor of each mode) including the effect of each mode and the interaction between them. This expression is very useful because it provides physical insight; therefore, it is very helpful in antenna design and analysis. The expression was obtained using the expansion of the total input admittance of the antenna in terms of the individual admittances of the CM in conjunction with the well-known expression for Q by Yaghjian and Best [1]. Numerical examples will be provided to illustrate the expression and compare it with the original expression by Yajian and Best.

Keywords

antenna radiation patterns; antenna theory; modal analysis; CM; arbitrary antenna; modal Q_n term; theory of characteristic mode; total admittance expansion; total radiation Q; Admittance; Antenna radiation patterns; Antenna theory; Dipole antennas; Impedance; Characteristic modes; Q of Antennas; Quality factor; fundamental limits;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE

Conference_Location

Memphis, TN

ISSN

1522-3965

Print_ISBN

978-1-4799-3538-3

Type

conf

DOI

10.1109/APS.2014.6904356

Filename

6904356