Modeling and measurement of a multi-fin metamaterial-loaded monopole with metal cap

Specially arranged metamaterial structures may lead to a higher degree of constitutive parameter tailoring. This paper investigates a multi-fin metamaterial-loaded monopole with a metal cap. Capacitively-loaded-loop (CLL) metamaterial elements are placed on fins, radially arranged around the monopole antenna. The metamaterial fins change the radiation pattern of the monopole to a sectoral beam in the azimuth plane with a significant front-to-back ratio, and the elevation peak relocates normal to the monopole due to a metal cap. An experimental model is built with six manufactured fin inserts inside an additively manufactured (3D-printed) holder that surrounds the monopole. Simulation and measurement results are compared and show agreement.