Abstract
A double-layer radial line helical array antenna with rectangular aperture is proposed. With rectangular aperture, the antenna can be assembled to form high gain antennas. The use of double-layer feed system ensures an equal-amplitude in-phase feed for all elements in an expected frequency band, which can improve antenna gain and aperture e-ciency. This paper presents its design concept, derives pertinent design and performance, and a 16-element array antenna is simulated and measured. The experimental results show that in the range of 3.8GHz to 4.2GHz, the antenna gain is over 17.7dB, aperture e-ciency over 82%, antenna sidelobe level below i12:0dB, antenna axial ratio below 3.2dB, and antenna VSWR below 1.52.
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