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Orbital angular momentum (OAM) based on uniform circular array (UCA) has been proposed to achieve larger channel capacity in radio frequency. There have been many researches on theoretical analysis and practical antenna design of UCA. However, there have been few studies on the characteristics of OAM signal based on UCA considering spin angular momentum. In this paper, we have proposed two UCA architectures...
Up to now, conventional compact antennas have been designed to acquire as much gain as an ideal 6-port polarimetric antenna can obtain. It was recently shown that an achievable number of degrees of freedom (DOF) can be increased regardless of given antenna space. Here, we propose a compact directional 16-port antenna, with a size of about and a radiation frequency of 2 GHz, which...
In this paper, we present our recent achievements associated with the antenna and modulation technologies for the 5-th generation wireless communication systems including the design of pattern polarization antennas, the development of hybrid beamforming technology, beamspace multi-input multi-output (MIMO) technology, as well as more recent radio frequency orbital angular momentum (RF-OAM). These...
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