Techsloading839

• Self-phase Quadrifilar Helix Antenna
• Quadrifilar Helix Antenna

Sep 01, 2016 A novel dual-mode triple-band communication terminal antenna is proposed in terms of the quadrifilar helix antenna and the BeiDou satellite navigation system. First, the folded arms are introduced, and at the top of the quadrifilar helix antenna, the folded arms are connected to the helix arms by the series capacitors. 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. Notched monopole Printed trapezoidal self-phased. Quadrifilar helix. Engineering utilities. L i b r a r i e s. Array synthesis. Friis transmission. Jun 29, 2019 Here is another quadrifilar helix antenna design, this time for ADSB (aircraft mode-S transponder) reception at 1090 MHz. Unlike other antenna types this antenna has a spherical coverage with 120° 3dB beamwidth and estimated peak gain of 4.6dBi at 1090MHz. The basic design was done using Antenna Magus 5.2 and I just used the calculated dimensions.

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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Self-phase Quadrifilar Helix Antenna

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Quadrifilar Helix Antenna

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