8-elements antenna array calibration
An antenna rotation rig with control and data logging software has been developed to allow antenna radiation patterns to be investigated. The equipment is sufficiently compact that it can be configured to make measurments either in the field or within the radio frequency anechoic chamber.
I & Q 4 element antenna calibration unit
The antenna amplitude and phase characteristics are extracted using a four channel quadrature down converter. This operates at 10 MHz and includes a reference channel to provide cancellation of residual phase and frequency errors in the measurement system. The equipment can be used to make measurements at arbituary frequencies using external down converters. Measurements have been performed using this technique from 50 MHz to 6 GHz.