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• Self-phase Quadrifilar Helix Antenna
• Quadrifilar Helix Antenna

Radiation patterns of a dual-band self-phased quadrifilar helix antenna designed for GPS, at the L1 and L2 bands. Cavity-backed Sinuous and Log-spiral antennas Cavity backed spiral antennas can provide unidirectional, broadband, polarisation agile radiation patterns when the cavity backings are loaded with absorber layers. 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. A self phased antenna element with two pairs of arms (110, 120, 130, 140) in a crossed relationship transceives a signal at a resonant frequency. A dielectric (150, 160) is disposed adjacent an arm (130, 140) to obtain a self phased relationship in the arms (110, 120, 130, 140) at the resonant frequency. The arms can form crossed loops or twisted crossed loops such as a quadrifilar helix. Jan 13, 2020 - Mictronics - Personal blog about electronic projects, antennas, RF and other stuff. Notched monopole Printed trapezoidal self-phased. Quadrifilar helix. Engineering utilities. L i b r a r i e s. Array synthesis. Friis transmission.

Abstract

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.

References

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