EMSICC Based CRLH Compact Leaky-wave Antenna with Enhanced Broadside Efficiency

In this paper, composite right/left handed (CRLH) compact high gain leaky-wave antenna (LWA) is designed based on eighth-mode substrate integrated circular cavity (EMSICC). Utilizing the longitudinal asymmetry, frequency as well as Q-balancing condition are achieved which result in the enhancement of overall radiation efficiency. The broadside efficiency of the proposed antenna is 93.79% with the off-broadside radiation efficiency variation of ± 1.4%. The proposed antenna covers a frequency beam scanning range of $\sim 98 ^{\circ\,}(- 45 ^{\circ\,}$ to $53 ^{\circ})$ and maximum gain of 14dBi is obtained. The proposed prototype could be suitable for land, airborne and naval radars. Full-wave simulations are carried out in Ansys HFSS.