Abstract

Self-phase Quadrifilar Helix Antenna

The objective of this study is the design and implementation of a Quadrifilar Helix Antenna (QHA) for telemetry, tracking and control of a Low Earth Orbit (LEO) satellite. Because of its cardioid-shaped circularly polarized beam, QHA can satisfy requirements of satellite communications completely. In this paper, a variation of QHA referred to as “self-phased QHA” with a single feeding circuit, has been proposed to reduce implementation complexity. The designed antenna has been analyzed and the experimental results show that the radiation pattern provides good wide-beam in the desired frequency while the antenna’s bandwidth is around 200MHz when VSWR is less than 2.

Self-phased quadrifilar helix (S-P QHA) Axial-mode wire helix. Open-ended quadrifilar helix (O-C QHA) Discone. Wire Grid Array. Dipole-fed corner reflector. Waveguide-fed pyramidal horn. Inverted-F (IFA) Pin-fed conical horn. Pin-fed pyramidal horn. Dual microstrip. A self-phased quadrifilar helix antenna is designed, simulated, fabricated and measured for use in Army air-to-ground and airborne-assisted ground-to-ground communication systems. The effect of the metallic ground plane provided by the aircraft fuselage is explored through simulation, and the ideal standoff distance from this ground plane to maximize realized gain is determined.

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3. A side-fed bifilar helix antenna can be integrated with a quadrifilar helix antenna in a piggy back configuration in order to achieve a dual-mode radiating structure. The overall length of the structure is 0.44λ at the resonant frequency (1.54 GHz) of the space mode antenna and 0.39λ at the resonant frequency (1.34 GHz) of the terrestrial mode antenna.

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Quadrifilar Helix Antenna

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