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Using an equivalent circuit, a new wideband array was examined using physically realizable tightly coupled dipoles. A miniaturized element using inductive and capacitive loading was used to suppress ground plane effects for a broadband conformal array. Serial inductance was demonstrated to effectively miniaturize the radiating element and lead to even greater bandwidth as compared to the CSA array...
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...
This letter discusses a miniature low profile ultrawideband (UWB) spiral. The antenna is miniaturized using a combination of dielectric and inductive loading. In addition, a ferrite coated ground plane is adopted in place of the traditional metallic ground plane for profile reduction. Using full-wave simulations and measurements, it is shown that the miniaturized spiral can achieve similar performance...
To successfully reduce the size of UWB antennas requires a good understanding of radiation mechanisms, impedance behaviour, acceptable trade-off between gain and bandwidth and effective methods to reduce phase near-field velocity. The fact that theoretical limitation of a small antenna is determined by the antenna's size in terms of free-space wavelength regardless of the geometry or composition the...
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