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Antennas are a very important component of communication systems. By definition, an antenna is a device used to transform an RF signal, traveling on a conductor, in to an electromagnetic wave in free space the broadband circularly polarized MSA, play a vital role in wireless communication due to its low-profile, small-size and light weight. As well known, a circularly polarized wave can be obtained when spatially orthogonal modes are excited with equal amplitude. Conventional designs of MSA for circular polarization are usually achieved by truncating patch corners, cutting rectangular ring slots in the rectangular patch.
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