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A technique for measuring antenna drive port impedance using backscatter data

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3 Author(s)
Mayhan, Joseph T. ; Lincoln Lab., MIT, Lexington, MA, USA ; Dion, A. ; Simmons, A.

This paper describes a technique for measuring the drive port impedance, denoted ZD, of an antenna using radar backscatter data. It requires only that one has access to the antenna terminal ports, and the ability to attach a known load to the terminals. In the technique described here, three sets of backscatter data (amplitude and phase) are required: one with the terminals short-circuited, denoted E s, one with the terminals open-circuited, denoted Eo , and the third with the terminals loaded with a known resistance Ro, denoted E1. These data are readily processed to obtain ZD, according to the simple relationship defined in equation (8). An analysis of the effects of the various error sources affecting the value of ZD determined using this technique is also presented. The utility of the technique is illustrated by measuring ZD for a “canonical” body using measured results at L band and UHF taken on three differing RCS ranges, selected so that they differ in the quality of the backscatter measurement over the frequency range under consideration

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Antennas and Propagation, IEEE Transactions on  (Volume:42 ,  Issue: 4 )