Abstract
In order to meet broad-beamwidth demand of antenna in some occasions, a new multipolarization antenna is designed. The antenna contains two independent ports working with linear and circular polarization, so it can receive three orthogonal components of electric field in space. Linear and circular polarization are realized by a circular patch and a monopole antenna loaded with a disc, respectively. Three copper poles are added between the circular patch and disc to adjust the matching of the monopole antenna. The measured results show that impedance bandwidth in which return loss is less than -10 dB is 1.21-1.85 and 1.54-1.61 GHz for circular- polarization and linear-polarization ports, respectively. The bandwidth for axial ratio AR <; 3 dB is 1.45-1.8 GHz. The isolation between two ports is larger than 15 dB. The antenna can be used in occasions where the antennas need to have broad-beamwidth for its advantages of compact structure and low profile.
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