Design of 4-element Circular Polarized MIMO Antenna for C-Band Wireless Application

A 4-element Circular polarized MIMO (Multiple Input Multiple Output) antenna is designed where both the transmitter and receiver use multiple antennas to increase the system efficiency. Arlon AD350 is used as substrate material with the dielectric constant of 3.5 and the dimension of the design of proposed antenna is
$68\ \text{mm}\times 68\ \text{mm}\times 1.6\ \text{mm}$
. This paper defines a MIMO system with isolation greater than −15dB and has a gain of 7. 12dBi. To acquire high isolation, orthogonal arrangement of component is used and minimum isolation between the antenna is obtained 28dB at 5.41GHz with 1.08dB axial ratio. In this proposed system, isolation and gain are increased by almost 8dB and 2.5dBi, respectively. Moreover, low ECC (envelope correlation coefficient) value, rising diversity gain (DG), promising axial ratio value is obtained by simulation. The proposed antenna is simulated through CST microwave studio. This antenna standard can be used in C band wireless application for 5G communication.