A SIW multi-polarized leaky-wave antenna based on multi-slot structure

With the development of MIMO(multiple-input multiple-output) technology, multi-polarized antennas are more and more widely used in communication systems, and various types of SIW(substrate integrated waveguide) multi-polarized leaky-wave antennas emerge in endlessly. In order to reduce cell spacing and the size of leaky-wave antenna, a multi-slot cell structure with high dispersion characteristics is designed based on rectangular slot. The multi-slot structure can suppress the open stopband to a certain extent and realize the continuous beam scanning from backward to forward. A multi-polarized leaky-wave antenna is composed of two 45° multi-slot linear arrays and a 3dB coupler, which can realize four polarization modes: left-handed circular polarization, right-handed circular polarization, -45° polarization and +45° polarization. The measured results show that the beam scanning range is about 60° and antenna gain is more than 9dBi regardless of circular polarization or linear polarization.