Q/V Band Dual-Beam Dual-Polarization Cassegrain Antenna

This paper presents the design and development of Symmetrical Cassegrain Unshaped reflector antenna in Q/V band for high speed communication. It is the first Q/V band antenna on-board ISRO’s Spacecraft. Highlights of the design includes arriving at a compact geometry utilizing existing moulds for realizing metallized CFRP reflectors, dual-feed system with Orthomode Transducer (OMT) that generates dual transmit-receive beams in orthogonal polarizations, high Crosspolar Isolation (XPI) and low plumbing losses. The measured Edge-of-Coverage gain of 43dBi and XPI of -27dB over the Q/V band closely matches with the predicted results.