Jacobs, Ockert BothaOdendaal, J.W. (Johann Wilhelm)Joubert, Johan2014-04-042014-04-042013Jacobs, OB, Odendaal, JW & Joubert, J 2013, 'Quad-ridge horn antenna with elliptically shaped sidewalls', IEEE Transactions on Antennas and Propagation, vol. 61, no. 6, pp. 2948-2955.0018-926X (print)1558-2221 (online)10.1109/TAP.2013.2254436http://hdl.handle.net/2263/39608We present a quad-ridge horn antenna as a feed for a reflector antenna for use in radio astronomy applications. The antenna uses elliptically shaped sidewalls to limit the variation of beamwidth over a wide frequency range and to obtain greater radiation pattern rotational symmetry. The antenna is dual-polarized and matched over more than a 4:1 bandwidth. A design procedure is presented and a prototype designed according to this procedure is shown. Measured and simulated results of the prototype agree with each other well. The antenna is analyzed with a prime focus reflector to determine the range of efficiencies that can be expected.en© 2013 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.Antenna feedsBroadbandHorn antennasReflector antennasAntennas, HornAntennas, ReflectorRadio astronomyPostprint Article