The mutual coupling effect of array antenna can usually be characterized by the dominance of active reflection coefficient. A test method of active reflection coefficient is proposed in this paper. the theory of antenna active reflection coefficient is analyzed, and the array antenna modeling and active reflection coefficient simulation results are introduced by HFSS. the hardware composition and function of antenna active reflection coefficient test system are introduced. the comparison between test results and simulation results is analyzed. The results are in good agreement. Compared with the traditional test methods, the designed test system has the characteristics of intuitive test results, fast measurement speed, high sensitivity, large dynamic range, small measurement error and strong expansibility.
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