Antenna pattern corrections using a space diversity of the antenna under test (AUT) on top of the turntable

摘要

Two correction methods are given for antenna measurements disturbed by reflections or multipath propagation in the measurement zone. The described techniques are based on space diversity moving the antenna under test to different positions on the turntable. In the first approach, the antenna positions need not to be Known; the relative positions of the phase center with respect to the turntable axis are estimated from the measured complex amplitude at different angles; the measured values then are phase normalized and summed up coherently. In the second approach, the antenna under test is shifted linearly to different lateral positions. For each rotation angle, a synthetic array is formed pointing at the desired direction of illumination and suppressing radiation from unwanted directions. Both methods have been tested and verified successfully.