Wideband planar Yagi antennas for millimetre wave frequency applications.

Abstract: In this paper, a very wide-band Yagi antenna suitable for high-data rate communication in the millimetre-wave frequency range is presented. The coplanar waveguide (CPW) fed antenna is realised on InP substrate using the CPW ground planes as the reflector elements. The measured <i>S</i><sub>11</sub> return loss under -10 dB shows a 100% bandwidth for the 140-220 GHz frequency band antenna and 50% for the 220-325 GHz frequency band antenna. The maximum measured gain of the antenna is 7.35 dB at 202 GHz and 4.75 dB at 260 GHz