On the Design of SIW Dual Circularly-Polarized Leaky Wave Antenna for mm-Wave Applications

Circularly-polarized antennas are considered among the most effective antenna types due to their high penetration capability. Further, dual circularly-polarized can double the physical channel capacity over the same frequency through sending different messages over two orthogonal polarization. In this article, a low profile, compact design is proposed for dual-circularly polarized antenna. The proposed structure consists of a hybrid coupler feeding two guided channels, where each channel is loaded with a leaky-wave slot antenna. The entire configuration is designed using Substrate Integrated Waveguide (SIW) technology to provide a low profile and reduce the implementation cost. The proposed design covers a wide band of operation from 27 to 32 GHz, with a matching level below -15 dB. The final structure is simulated with two different numerical packages to provide a sufficient validation for the proposed design.