In a millimeter waveband transceiver using an antenna and a waveguide for a connection line, it is necessary to perform transmission mode line conversion between TEM waves of a microstrip line and VTE01 mode waves of the waveguide. There is a limit to reducing the conversion loss using only a matching...http://www.google.co.uk/patents/US7804443?utm_source=gb-gplus-sharePatent US7804443 - Millimeter waveband transceiver, radar and vehicle using the same
