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15339
An Automated Test Setup for the Characterization of Antenna in CATR
Abstract:
This paper describes the development of a fully automated measurement software for antenna radiation pattern measurements in a Compact Antenna Test Range (CATR). The CATR has a frequency range from 2-40 GHz and the measurement hardware includes a Network Analyzer for transmitting and Receiving the microwave signal and a Positioner controller to control the motion of the Styrofoam column. The measurement process includes Calibration of CATR with a Standard Gain Horn (SGH) antenna followed by Gain versus angle measurement of the Antenna under test (AUT). The software is designed to control a variety of microwave transmitter / receiver and two axis Positioner controllers through the standard General Purpose interface bus (GPIB) interface. Addition of new Network Analyzers is supported through a slight modification of hardware control module. Time-domain gating is implemented to remove the unwanted signals and get the isolated response of AUT. The gated response of the AUT is compared with the calibration data in the frequency domain to obtain the desired results. The data acquisition and processing is implemented in Agilent VEE and Matlab. A variety of experimental measurements with SGH antennas were performed to validate the accuracy of software. A comparison of results with existing commercial softwares is presented and the measured results are found to be within .2 dBm.

References:

[1] A D olver, Compact Antenna test Ranges, Antennas and Propagation, 1991.
[2] An introduction to Antenna test ranges, Measurements and instrumentation by Jeffrey A. Fordham microwave instrumentation technologies, LLC.
[3] ARCS interface module, design and specification, March Microwave systems B.V., Nuenen, the Netherlands
[4] Millitech Inc. 29 Industrial Drive East Northampton, MA U.S.A 01060
[5] Agilent Antenna and RCS measurement configuration using PNA Microwave Network Analyzers
[6] Agilent VEE Pro, version: 7.0.6310.0, http://www.home.agilent.com
[7] A.M. Prodoehl and W. L. Stutzman, implementation and results of a time-domain gating system for far-field ranges, AMTA1997.
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