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Latest Developments and New Design Approaches in Designing Leaky-wave Antennas based on Substrate Integrated Waveguide Technology

In this paper, the new findings in designing high gain, compact, larger beam scanning range and highly efficient leaky-wave antennas based on substrate integrated waveguide (SIW) since last few years are proposed. The utilization of SIW in various ways not only eliminates the drawbacks of metallic waveguide but also found suitable for integrating with microwave or mm-wave circuitry with reduced fabrication cost and complexity. Initially, the structural advantages of SIW in designing high gain and polarization diversity LWAs are presented. Further, exploitation of 1D-asymmetric half-mode SIW, quarter-mode SIW and 2D-asymmetric eighth-mode SIW in the design results into significant improvement of gain and radiation efficiency keeping the geometry much compact. Several analysis and antenna parameters are optimized by validating the response of HFSS full-wave simulation with ADS circuit simulator.