Reduction in Depth for a Radiating Flange Backed by a Rectangular Resonant Cavity Using High Index Materials: Preliminary Report

Report No. ARL-MR-0851
Authors: Gregory A. Mitchell
Date/Pages: September 2013; 30 pages
Abstract: Resonant cavities are widely used to enhance the properties of antennas far-field radiation characteristics. However, at low frequencies, the depth of these cavities can become excessively large making them unusable in many applications. The arrival of metamaterials exhibiting high permittivity and permeability with relatively low loss at these frequencies allows designers to potentially load a resonant cavity to greatly reduce the depth of such structures. This report uses numerical simulations to investigate how loading a resonant rectangular cavity with high index metamaterials affects the broadband performance of an antenna in terms of realized gain. Both isotropic and anisotropic materials are investigated and the benefits and detractors of all cases are outlined.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2013