Theoretical Modeling and Analysis of Circularly Polarized Annular Leaky-Wave Antenna Based on Travelling-Wave Structure

In this paper, a theoretical model based on the electric field integration method is proposed to analyse radiation properties of slotted annular Leaky-Wave Antenna (LWA), which can generate Circularly Polarized (CP) conical beam or broadside beam. The LWA contains radiating elements arranged along circular travelling-wave structure with equal intervals. By combining and theory, design procedure for SIW presented. To verify model, three examples LWAs different angles have been designed fabricated. Calculation results from are consistent simulation measurement results. significantly reduce period an instructive tool antenna design.