Abstract
It is well known that the parallel branch wire loading technique to an antenna is an effective method to reduce the antenna size. In this paper, in order to reduce the size of a square loop antenna, we introduce a parallel branch wire loaded square loop antenna. And it is shown that size of the parallel branch wire loaded square loop antenna is reduce to almost 60%. We also investigated two elements Yagi-Uda array antenna using the parallel branch wire loaded square loop antennas as element antennas. It is proved that the parallel branch wire loaded square loop antenna without feed point works as the reflector element and the obtained gain of the Yagi-Uda array antenna is about 6.8dB.
