Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Pseudo-Isotropic Source for Anechoic Chamber Qualification



Perry F. Wilson, John M. Ladbury, Galen H. Koepke


A pseudo-isotropic source is presented. The source consists of an electrically-large cavity with internal excitation (horn antenna), a variable internal boundary condition (a rotating paddle as in a reverberation chamber), and randomly placed apertures for external radiation. On average, the radiation pattern approaches that of an isotropic source. Data are presented for a non-optimized box realization showing +/- 3 dB isotropy over typical planar cuts. Simulation suggest that better than +/- 2 dB should be possible.
Conference Dates
August 19-23, 2002
Conference Location
Minneapolis, MN, USA
Conference Title
2002 Intl. EMC Symp.


isotropic radiator, reverberation chamber, anechoic chamber


Wilson, P. , Ladbury, J. and Koepke, G. (2002), Pseudo-Isotropic Source for Anechoic Chamber Qualification, 2002 Intl. EMC Symp., Minneapolis, MN, USA (Accessed June 21, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created August 18, 2002, Updated October 12, 2021