Spherical Antenna Measurements Performed in a Robot-Based mm-Wave Test Range

The robot-based antenna measurement system at the Institute of High Frequency Technology at RWTH Aachen University is put into operation and its measuring capability is proven by preliminary spherical measurement data. For this purpose, near- and far-field measurement data of a standard gain horn antenna are shown and compared with measurement data of the institute’s compact antenna test range. The influence of the scalar feed horn used as the probe is compensated by a full high-order probe correction. It is shown that the deviation in the E-plane of the antenna is mainly ≲ −40 dB in wide parts of the angular range of the radiation pattern. In view of the fact that the construction of the measurement range is not yet completed and no absorbers are mounted, the deviations are, thus, within the range of the expected tolerance.