Numerical Investigation of Cross Polar Reduction CATR Feed in Dual Linear Polarisation

The polarization purity of an antenna system is an important performance parameter, particularly in dual-polarized systems, where depolarization can prevent operating objectives from being achieved

Accurate polarisation testing requires a significantly higher polarisation purity of the test system than of the test object. The Compact Antenna Test Range (CATR) is widely used for antenna system testing purposes. In this paper, we show by numerical simulation, that the cross-polar discrimination of the QZ can be improved by as much as 10dB with respect to standard feeds on a 1.6:1 bandwidth for dual liner polarization in standard side and edge-feed single reflector CATR.