Design of Circularly Polarized Low-profile Antenna with Omnidirectional Radiation Pattern

概要

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This paper presents an electrically small and circularly polarized antenna with omnidirectional radiation pattern. This antenna consists of a horizontal loop element with double U-shaped parasitic structures and a vertical element from a feeding point to generate circular polarization. An omnidirectional radiation pattern of circular polarization is obtained in 360-degree azimuth directions with the maximum gain of -1.9 dBic in the parallel direction to the ground plane at 900 MHz band. The overall size of the proposed antenna including the ground plane is 48 mm × 20 mm × 12.8 mm (0.14λ × 0.06λ × 0.04λ) with ka = 0.46 < 0.5 (k: wavenumber at the resonant frequency, a: radius of a sphere surrounding the antenna), corresponding to a definition of electrically small antenna. The measured results show that the fabricated circularly polarized antenna has the omnidirectional radiation pattern. The simulated and measured results are also demonstrated and discussed.
2014-01-22