Low profile cavity backed antennas based on substrate integrated waveguide technology

A series of low profile cavity backed antennas (CBAs) based on substrate integrated waveguide (SIW) technology developed in the Key Laboratory of RF Circuits & System of Ministry of Education, Hangzhou Dianzi University has been reviewed in this paper. These linearly and circularly polarized antennas and their performance improved methods such as bandwidth enhancement and size reduction have been presented. These novel antennas retain the advantage of conventional metallic cavity backed antenna, including high gain, high front-to-back ratio, and low cross polarization level, and also keep the advantage of microstrip antenna including low profile, light weight, low fabrication cost, and easy integration with planar circuit.