Analysis of the Feed Absorber Fences in Compact Antenna Test Ranges and their Impact on Quiet Zone Metrics

Authors: Vince Rodriguez
Publication: EuCAP 2023
Copyright Owner: IEEE

Compact Antenna Test Ranges (CATR) are one of the workhorses of antenna measurements. They have been recently chosen as the preferred method for testing 5G antenna systems. Ideally, a plane wave is generated at the quiet zone (QZ) by the parabolic reflector. The purity of the plane wave is affected by the pattern of the feed and the termination of the reflector edges. The feed pattern must be broad enough to minimize the amplitude taper across the QZ. However, a broad beam antenna will cause direct illumination of the QZ from the feed, creating an interference ripple on the QZ fields. Recently a paper was presented where a CATR was analyzed using a high order MoM approach. This method provides the field distribution across the QZ, not only from the reflector but also from the source spillover. In this paper the absorber fence that is used to minimize the direct illumination of the QZ from the feed is analyzed. Traditional fences are analyzed for different absorber loadings, from a heavily loaded to lighter loaded absorber. In addition to the analysis of the absorber loading, a differently shaped absorber fence is analyzed. The results show that absorber loading has little effect on the QZ metrics. Shaping the fence is far more important. The specially shaped fence shows that the diffraction is reduced resulting in an improved ripple level and phase variation in the QZ.

You have requested a Reprint of an IEEE Paper

Copyright 2023 IEEE. Reprinted from EuCAP 2023 Conference.

This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of NSI-MI Technologies' products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to

By choosing to view this document, you agree to all provisions of the copyright laws protecting it.


1125 Satellite Blvd. NW,
Ste. 100
Suwanee, GA 30024 USA

+1 678 475 8300
+1 678 542 2601

Los Angeles

19730 Magellan Dr.
Torrance, CA 90502 USA

+1 310 525 7000
+1 310 525 7100


Stubley Lane,
Dronfield, S18 1DJ UK

+44 1246 581500

SIAE International Airshow

Paris, France Finding your local time... 10 Days
This site is using cookies for analytical purposes and to provide a better user experience. Read our Privacy Policy for more information.