Omni-directional Leaky-wave Coaxial Antenna

In this paper, we present modal analysis of a coaxial leaky wave antenna composed of an inner perfect electric conductor and an outer artificial partially reflecting impedance surface separated by a dielectric layer. The artificial impedance surface can be implemented by periodic slits with periodicity much less than the operating wavelength. The equivalent surface impedance of this surface is obtained by analytical form. Simple design steps based on this modal analysis are presented. These design steps are used to design a coaxial leaky wave antenna. This design is verified by comparing results with full wave analysis based on finite element simulator.