High gain Self-diplexing SIW leaky wave Antenna

In this communication, a novel self diplexing substrate integrated waveguide (SIW) leaky wave antenna for dual band communication system are presented. A different type of polarization at different frequencies band are obtained by changing the feed. Antenna provides circular polarization at one frequency band and linear-polarization on other band. An array of transverse, longitudinal slots of different length on top layer of rectangular SIW are used as radiator and array of circular slot on bottom layer is used to achieve circular polarization on single band. Antenna is operating on the principle of leaky wave antenna hence high directivity and gain has been achieved.