Zeroth-order Resonator Antenna using Meandered Arm on Jerusalem Geometry in Mushroom-like Structure

This paper presents a compact zeroth-order resonator antenna by using meandered arm on Jerusalem geometry in mushroom-like structure. The ZOR antenna compose of two main elements including the modified Jerusalem shape in mushroom-like structure and microstrip-fed transmission line. Both of them can cooperate together to perform the zeroth-order of phase constant at the operating frequency of the proposed antenna. The antenna has very compact area of radiating patch with 20 × 45 mm
²
. Then, the omnidirectional radiation pattern can be provided in the plane of antenna patch.