Enhanced scanning rate for SIW-LWA with continuous beam steering using delay lines

A backward-to-forward continuous beam scanning leaky wave antenna (LWA) in substrate integrated waveguide (SIW) technology using delay lines is demonstrated in this study. A periodical H-shaped grooves on the top surface of SIW are etched to provide the slow-wave effect. Delay lines is introduced to change the group delay profile, increasing the SR. According to simulations, the presented LWA scans a broad angle in a limited bandwidth. Within the frequency range of 11.6 GHz to 12.3 GHz, scanning angle ranging from -41° to +31° (overall scanning angle of 72°) with scanning rate of 90°/GHz. This antenna has maximum gain of 14.53 dBi at 11.9 GHz and 92.5% efficiency, which is acceptable considering the antenna’s compact size.