All polariser devices show a return loss better 21 dB. For the linear devices, the isolation between horizontal and vertical polarisation is better 45 dB, for the circular one a port to port isolation better 19dB could be achieved.
Beside the good performance w.r.t. the S-parameter, all polariser devices were optimised for power handling, which means a high multipaction threshold and low losses.
The worst case losses for the FSS Tx/Rx polariser device is 0.06 dB, for the FSS/BSS Tx/Rx 0.1 dB and for the circular one 0.09 dB for Tx and 0.25 dB for Rx. The average losses, which are important for the thermal layout in practice, are even noticeable below.
The devices passed successfully the multipaction test with 6000 W at the input ports (maximum available input power of the test bed). Likewise, all three feed chains where thermally PIM tested, 3rd order for the linear ones and 6th/7th order for the circular. They all showed a performance below the noise floor and therewith easily fulfilling the requirement of -130 dBm.
From mechanical point of view, the three feed chains were qualified to be applicable in all kind of antennas used on a spacecraft, i.e.
• Dual reflector antenna
• Single offset reflector antenna
• Global horn antenna.