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This paper presents a small, low profile, 2" thick and 14" in aperture, spiral antenna backed by a thin ferrite ground plane. The antenna is intended to cover satellite (UHF TacSat (earth to LEO, 243-318 MHz)) and radio (PRC-148, PRC- 117F, PSC-5D (243-512 MHz)) communications. Miniaturization, ground plane treatment, and resistive loading techniques are considered, and a design optimization...
An alternative miniaturization technique is introduced, based on low-loss ferrite composites. The wave slow down for size reduction is provided by the permeability and permittivity of the ferrite composite, respectively. Ideally, the ferrite should possess equal permeability and permittivity (i.e. epsivpsilar = mupsilar) and must have low loss characteristics for large bandwidths. In this paper a...
A body-worn, meandered flare dipole was presented for operation at UHF frequencies. Measurements and simulations provided reference for its performance and applicability. Some mounting options were discussed and additional configurations will be discussed at the conference. As is evident from the given patterns, the body-worn antenna is highly sensitive to its location and mounting. Moreover, considering...
The purpose of the paper is to discuss broadband antenna miniaturization in general. The goal is to illustrate some simple guidelines that can used for miniaturizing a broadband antenna. To demonstrate these guidelines, we use a wire log-spiral antenna which is miniaturized via inductive loading. In this case, the inductive loading is achieved without modifying the antenna structure by increasing...
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