Dual and wideband mmWave 28/38 GHz quad port MIMO antenna for 5G and beyond applications.

The current study demonstrates a dual and wideband mmWave 4 × 4 port MIMO antenna for 5G and beyond applications. The proposed antenna is derived from a traditional inset-fed rectangular geometry, modified with multiple curved edges on the top plane to produce a large effective aperture and enable significant surface current distribution. Partial ground planes are connected using 45° tilted conducting strips to form a common ground, which enhances surface current distribution and balances power through each port. The antenna exhibits wide bandwidths of 2.3-6.5 GHz at resonant frequencies of 28-38 GHz, respectively. Moreover, the suggested antenna yields more than 21 dB isolation, 8.3 dB peak gain, 92% radiation efficiency, 89% multiplexing efficiency, an ECC of 0.00007, and a channel capacity of 21 bit/s/Hz. To validate the antenna design, the prototype was fabricated on a Rogers RT/Duroid 5880™ substrate, tested, and compared with simulated results, showing good agreement.