PHASE CONTROL OF TRANSMISSION ANTENNAS

摘要

A phase array antenna is monitored by applying to each element of the array in turn a signal known characteristics, detecting the signal output from t he selected element as a result of the applied known signal, and comparing the detected signal with the applied signal whereby to monitor changes in the applie d signal due to the signal path. The detection is preferably carried out using a s ingle monitoring unit in the near-field of each antenna element. Alternatively the detection is carried out using a single source of applied signals a number of individual monitoring units one for each element of the array, and a switching device for selecting the element of the array to be monitored.