Quad Port Multipolarized Reconfigurable MIMO Antenna for Sub 6 GHz Applications

Abstract

Recent reconfigurable technological advancements for wireless communication systems provide various global solutions. This research work presents a quad port multipolarized switchable multiple input multiple output (MIMO) antenna for sub 6 GHz applications. It covers the frequency range from 3.1 to 5.1 GHz, including the 5G NR band n78 (3.3 to 3.8 GHz) and 5G NR band n79 (4.4 to 5 GHz). The proposed antenna comprises four offset-fed monopole antenna elements with an overall dimension of 60 mm × 65 mm. To achieve circular polarization (CP), a parasitic meandering resonator is integrated with antenna elements using four PIN diodes. The polarization diversity is obtained by controlling the bias states of four PIN diodes. The radiating element −1/−3 offers left hand circular polarization (LHCP), while element −2/−4 procures right hand circular polarization (RHCP) when all diodes are ON. Consequently, the proposed antenna provides linear polarization (LP) under reverse bias conditions. Moreover, the designed antenna acquires a wide axial ratio bandwidth (ARBW) of 36.1%. In addition, the developed MIMO antenna exhibits isolation greater than 15 dB using the common ground plane, and the obtained ECC is less than 0.13. The prototype is fabricated, and the simulated responses are in good correlation with the measured results.

Four port MIMO antenna for IoT applications in public safety band and sub-6 GHz TDD 5G band

“…Operating bandwidth of the proposed antenna is also better than the antenna proposed in [6,16,17,[19][20][21]44], and [46]. Although, in [16,17,21,45,47] special isolation techniques have been used but the proposed antenna outperforms them in terms of isolation. However, the structure proposed in [19,20,46] , and [48] has high isolation but have complex geometry.…”

“…According to the table, the presented MIMO configuration is more compact than the MIMO antennas reported in [6, 16-21, 29, 30, 45-47]. Even with compact size the proposed antenna provides better isolation than [6,16,17,21,29,45,47]. Operating bandwidth of the proposed antenna is also better than the antenna proposed in [6,16,17,[19][20][21]44], and [46].…”