Antenna Gain and Radiation Pattern Measurements in Reverberation Chamber Using Doppler Effect

Abstract

In a recent paper, a novel technique that allows for the first time to perform actual antenna radiation pattern measurements in reverberation chamber (RC) has been presented. Even though its results were in good agreement with the ones obtained in anechoic chamber (AC), it was necessary to repeat stationary measurements locating the antenna under test (AUT) at N different fixed positions along its line-of-sight to a fixed probe antenna per angle under study, thus multiplying by N the measurement time when compared to measuring in AC. On the contrary, in this contribution, an improvement of this technique is presented, obtaining an antenna radiation pattern by performing only one measurement per angle under study, taking advantage of real-time Doppler effect. Moreover, the antenna gain is obtained from only one of these measurements, without the need to know the antenna efficiency, by using the Friis transmission equation. In order to demonstrate the validity of this improved technique, the radiation pattern for both E- and H- planes and the gain of a horn antenna have been measured in an RC, being the results in good agreement with the ones obtained in AC and the values provided by the antenna manufacturer, respectively.