High Gain and Wideband Leaky Wave Holograms using Gap Waveguide Surface Wave Launchers

In this paper a low loss, high gain and frequency scannable leaky wave holographic antenna is designed for operation in the frequency band 58 to 70 GHz. The antenna is realized based on the one-dimensional holography theory in the microwave frequency range. The antenna is composed of two basic sections: 1 - A surface wave launcher for the generation of TM₀ mode surface wave, and 2 - A one-dimensional hologram for the transformation of surface wave to radiation mode at a desire direction. For the avoidance of losses and dielectric dispersion, unit cells made of metallic bed of pins are used for the realization of holographic surface. The hologram is designed to generate a beam at the angle of 30 degrees relative to the normal at the frequency of 62 GHz. The gap waveguide technology is used for the realization of surface wave launcher. The designed antenna is scannable from 26 to 45 degrees in elevation. In the pass-band the gain of antenna is better than 26:5 dB and its total efficiency is more than 90%.