Wideband half-elliptical ring slot array loaded leaky wave antenna on a half-mode corrugated substrate integrated waveguide

This paper presents a leaky-wave antenna with elliptical ring slot array loaded on a half-mode corrugated substrate integrated waveguide (HM-CSIW) operating at 25 to 36.5 GHz. The half-mode CSIW is designed to have a cut-off frequency of 20 GHz and is shown to operate in the TE10 mode. The corrugated SIW is used as a guiding structure to host an array of half-elliptical ring-shaped slots to behave as a leaky-wave antenna. The antenna presents a frequency-controlled beam-scanning of 3 deg/GHz. It has an approximately stable gain of 14 dBi with an efficiency >75% throughout the bandwidth. The antenna is 0.51 mm thick, and flexible, hence, making them suitable for wearable devices and telecommunications for future 5G/6G applications.