Modified Rectangular-Patch Quad-Port Flexible-MIMO Antenna Generating Four-Narrow Bands for Future IoT and 5G-FR2 Wireless Band Applications

This research focuses on the development of single-port and multiple-input-multiple-output<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Quad-port</inf> (MIMO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">QP</inf>) antenna on Rogers-substrate with dimensions corresponding to 25mm×30mm (single-port) and 55mm×55mm (MIMO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">QP</inf>). The modified square-patch and defected-ground-structure (DGS) achieves four-narrow bandwidths corresponding to 4.31GHz-7.90GHz (WLAN, n79, n102, n104), 20.84GHz-26.53GHz (24.0GHz UWB), 37.05GHZ-43.12GHz (n260, n261) and 54.71GHz-59.65GHz (n263). The orthogonal-arrangement ensures isolation of more than 20.0dB with ECC<0.001, DG>9.995dB, TARC<-8.0dB, and CCL<0.10 b/s/Hz. The far-field analysis offers peak gain of 2.98dBi at 5.50GHz, 5.85dBi at 24.0GHz, 7.00dBi at 40.0GHz, and 8.72dBi at 56.45GHz with acceptable radiation patterns in principle-planes.