Statistical properties of linear antenna impedance in an electrically large cavity

Author

Warne, Larry K. ; Lee, Kelvin S H ; Hudson, H. Gerald ; Johnson, William A. ; Jorgenson, Roy E. ; Stronach, Stephen L.

Author_Institution

Sandia Nat. Labs., Albuquerque, NM, USA

Volume

51

Issue

5

fYear

2003

fDate

5/1/2003 12:00:00 AM

Firstpage

978

Lastpage

992

Abstract

The paper presents models and measurements of linear antenna input impedance in resonant cavities at high frequencies. Results are presented for both the case where the cavity is undermoded (modes with separate and discrete spectra) as well as the overmoded case (modes with overlapping spectra). A modal series is constructed and analyzed to determine the impedance statistical distribution. Both electrically small as well as electrically longer resonant and wall mounted antennas are analyzed. Measurements in a large mode stirred chamber cavity are compared with calculations. Finally, a method based on power arguments is given, yielding simple formulas for the impedance distribution.

Keywords

antenna testing; antenna theory; cavity resonators; dipole antennas; electric impedance; monopole antennas; statistical analysis; test facilities; antenna measurements; antenna theory; center driven dipole; discrete spectra; electrically large cavity; linear antenna impedance; mode stirred chamber cavity; monopole antenna; overlapping spectra; overmoded cavity; resonant antennas; resonant cavities; statistical distribution; statistical properties; undermoded cavity; wall mounted antennas; Antenna measurements; Current distribution; Dipole antennas; Frequency; Impedance measurement; Inductance; Kelvin; Laboratories; Resonance; Statistical distributions;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2003.811483

Filename

1208503