Pattern reconfigurable micro-strip patch array antenna using switchable feed-network

In this paper, a single-feed switchable feed network that combines two port of a micro-strip antenna with a quarter wavelength feed-line, is presented. The principle operation of a switchable feed network is based on the assumption that a quarter wavelength feed-line is terminated with a micro-strip antenna. The proposed switchable feed network can be designed with a multiple odd numbers of a quarter wavelength transmission line. Therefore it can be applied to a beam pattern reconfigurable antenna system. To verify the effectiveness of a pattern reconfigurable antenna, two by two micros-trip patch array antenna with a switchable feed-network was built and tested.