Design and Anlysis of 4-Port MIMO Antenna for mmWave Application
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Abstract
5G, the future generation of wireless communication, is mainly focusing on advance various antenna related technologies such as antenna operating mmWave, phased array antenna and massive MIMO, to achieve high data rate of 10Gbps. In this paper a 4-port MIMO antenna is designed, with each element being 2X2 corporate fed, patch antenna array, resonating at 28GHz. The designed antenna is basically suitable for small cell base station antenna operating at mm-Wave frequency. The antenna system can perform beam steering in the horizontal direction, depending on the weights fed to it. The designed antenna array is capable of beam steering in the horizontal direction. Each single element in an 2x2 array, is basically fed using quarter wave transformer, for proper impedance match across the radiating elements and for maximum power transfer to the antenna element. The designed array operates from 27.838 GHz - 28.757 GHz with 900MHz impedance bandwidth. The gain 2x2 array is 14dB and that of the entire array is 20.9dBi when all ports are fed with equal amplitude and in-phase signal with side lobe level of -12dB. The HPBW the array is 11.1 degree. When performed beam steering, the array shows a stable radiation pattern and SLL. The ECC is below 0.05, indicating minimum mutual coupling. It is observed that designed array is stable throughout the impedance bandwidth without much beam-titling. Beam steering in the required direction is done by changing the phase of the excitation signal at available ports.
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