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Abstract
Circularly polarized antennas are used in communications between ground stations and satellites to achieve reliable communication links. The right-hand circular polarization and left-hand circular polarization are two types of circular polarization in satellite communications, they are used to support uplink and downlink communications. Circularly polarized antennas are used also in radar system for target detection, tracking and identification. The “three-element circularly polarized microstrip array antenna” is designed to produce left-handed circular polarization, make its size compact, make its bandwidth wider than 3.7–4.2GHz and achieve high gain. Circular polarization element antenna and three-element circularly polarized microstrip array antenna are designed and simulated in software HFSS, and the circular polarization element antenna is manufactured and tested in anechoic chamber. For circular polarization element antenna and three-element circularly polarized microstrip array antenna, the study analyzed these parameters: AR, S(1,1), VSWR, bandwidth, normalized impedance, gain and realized gain, radiation efficiency. After optimized, the study get the required results of them.
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