Abstract
The study designed and implemented quadrifilar helix antenna (QHA) for weather satellite signal reception. The antenna design and optimization were done by varying the element diameter, the radial lengths, the axial lengths, and element materials on adopted model. The simulated QHA has far-field radiation pattern in the upper hemisphere with maximum gain of 4.14dBi at 0o and omnidirectional coverage, half-power beamwidth of 140o, bandwidth of 6.5MHz, and VSWR of 1.13. The implemented QHA has major lobe in conformity with the simulated QHA with maximum gain of 10.75dB at 0o, and half-power beamwidth of 104o.
Highlights
Polarization of an antenna is related to the orientations of electric fields radiated by the antenna
The Quadrifilar Helix Antenna (QHA) performance on element diameter was simulated with different American Wire Gauge (AWG)
The results showed that copper wire element has the best radiation efficiency, radiated power, minimal loss and best radiation pattern compared to Aluminum, Brass, Silver, and Phosphor-Bronze materials
Summary
Polarization of an antenna is related to the orientations of electric fields radiated by the antenna. The circularly polarized (CP) antenna provides a solution to this problem and suitable for space communications [1]. The CP antenna is very effective in combating multi-path interference or fading [3, 4]. Quadrifilar Helix Antenna (QHA) provides circular polarization and exhibits radiation pattern in the entire hemisphere. The radiation pattern is omnidirectional in the plane perpendicular to its main axis and provides fade-free reception. Showed that the resonant (element length = λ/2), 1/2-turn, two bifilar helices, antiphased-fed, radiate a cardiodshaped, circularly polarized pattern when the diameter is 0.18λ and the axial length is 0.27λ. If the current on the radials is approximated by a uniform distribution, the following simplified solutions result: EφR1,2
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