TE 20 mode substrate integrated waveguide based high gain eight‐beam leaky‐wave antenna for multi‐directional radiation coverage

Abstract

In this article, a TE20 mode substrate integrated waveguide (SIW) is utilized to design a leaky-wave antenna (LWA) which is capable to scan all the four directions (eight quadrants) simultaneously. With the eight radiated main beams, frequency beam scanning range of the proposed antenna is 56° in all the eight quadrants. By exploiting co-axial probe feeding and step impedance transformer, four ways microstrip power divider is designed which is further exploited to feed all the four TE20 mode SIW sections containing microstrip-coupled slotline-SIW transitions. For radiation, ±45° rectangular slots are systematically placed on the top as well as bottom plane of the structure. The proposed antenna is working within the frequency range of 10-11.7 GHz having the maximum peak gain of 14 dBi. The proposed design is verified by experimental results which are in good agreement with the simulation. Along with the utilization of higher order mode of SIW to achieve compactness and design simplicity, the four directional frequency beam scanning capability makes it a promising candidate in various microwave circuits and several beam-scanning applications including navigational and surveillance purpose.