Abstract
A low-profile S-band phased antenna array with characteristics of wide-scan and good circular polarization has been proposed. The finite array consists of 4 by 4 identical right-handed circularly polarized elements. To achieve the required impedance and axial ratio bandwidth, the single element is formed of three layers with the driven and parasitic patches on the bottom and top layers, respectively. The Rohacell HF51 is inserted in the middle layer for achieving good impedance matching and high radiation efficiency. The circular polarization is obtained by cutting a pair of triangular patches from the opposite corners of the radiating patches. To further improve the circularly polarized performance, the feeding port of the antenna element is located with an offset distance to the center of the structure. The results can confirm that the active VSWR is less than 2 and axial ratio is less than 3.5 dB when scanning up to 45° in both principal planes.
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