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Wideband Circularly Polarized Quadrifilar Helix Antenna With Hemispherical Coverage
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DOI：10.1109/LAWP.2026.3654580.png)
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Abstract
En 中文
This letter presents a wideband circularly polarized quadrifilar helix antenna (QHA) featuring simultaneously wide 3 dB axial ratio beamwidth (ARBW) and half-power beamwidth (HPBW), addressing the conventional tradeoff between bandwidth and beamwidth. The antenna comprises four pairs of three-stage stepped-impedance folded helical arms, collectively loaded with an arc-shaped metal ring on top. The three-stage stepped-impedance folded helical arm effectively enhance the bandwidth while maintaining a wide HPBW, and the arc-shaped metal ring further broadens the 3 dB ARBW across the wideband. To validate, a prototype was fabricated and measured. Measurements show that the bandwidths corresponding to 10 dB return loss and 3 dB AR reach 44.2% and 35.2%, respectively. Moreover, within a 17.4% bandwidth, the measured HPBW and 3 dB ARBW vary from 132° to 152° and 179° to 265°, respectively, demonstrating its suitability for wideband circularly polarized applications with broad beam coverage and robust AR performance.
Keywords:
Circular polarization
quadrifilar helix
wide- band
wide beam
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