A novel 4-port MIMO antenna with chamfered edge for 5G NR n77/n78/n79 bands and WLAN applications

A novel, compact, and low-cost four-element multiple-input multiple-output (MIMO) antenna with a high gain is proposed in this work, operating in the frequency range of 3.3-6 GHz. The suggested antenna structure uses easily accessible substrate material and has been designed and simulated using Ansys HFSS 3D electromagnetic simulation software. The radiating elements are placed orthogonally, each consisting of two circular rings. To improve the impedance matching and reduce mutual coupling, the corners of the radiating patch are chamfered, and partial ground structure is applied. The defected ground structure (DGS) method is used for further enhancement in isolation, making the isolation as high as -55 dB. The measured gain of the antenna is more than 12 dB over the considered frequency range. The diversity gain (DG) is more than 9.99 dB, while the envelope correlation coefficient (ECC) is less than 0.006. Also, the mean effective gain (MEG), channel capacity loss (CCL), and total active reflection coefficient (TARC) results are within the optimal range. These make the designed antenna suitable for the sub-6 GHz 5G new radio (NR) n77 (3.3-4.2 GHz), n78 (3.3-3.8 GHz), and n79 (4.4-5 GHz) bands along with WLAN (5.1-5.8 GHz) applications.