Low-Profile UHF Antenna Design Based on an Anisotropic Transverse Resonance Condition

Report No. ARL-TR-7035
Authors: Gregory Mitchell and Wasyl Wasylkiwskyj
Date/Pages: August 2014; 32 pages
Abstract: A resonance condition is derived for a tapered rectangular cavity partially loaded with anisotropic magnetic material. This resonance condition leads to the design of an extremely low-profile (λo/18) antenna with over an octave of bandwidth and positive realized gain from 200515 MHz. The equation derived for the shape of the partially loaded antenna cavity maintains a constant cutoff frequency even as more anisotropic material is introduced to the cavity. Also a method is determined to tailor the shape of the cavity as needed using the normal component of the permeability tensor with little to no effect on the performance of the antenna.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2014