Quaternion MIMO Millimeter Wave Antenna for 5G Applications

In order to reduce the multipath fading caused by the reflection of various obstacles in short-distance communication, this paper designs a quaternion MIMO millimeter wave antenna working at 28 GHz. The antenna design adopts an inverted trapezoidal radiation patch and a slotted trapezoidal ground plate structure, so that the |S11 | of the antenna is lower than −10 dB in the frequency band of 24 ∼ 32 GHz. By using a 1 × 2 array structure as the unit of MIMO antenna, the gain of the antenna at 28 GHz is 7.5 dBi. The isolation degree of each port is lower than −25 dB by orthogonal placement of each unit. The performance of the antenna is tested by the physical production test. The actual test results show that the operating bandwidth of the antenna is consistent with the simulation results. The gain at 28 GHz is slightly lower than the simulation results by 0.1 dBi, and the isolation of each port is lower than −18 dB, which is 7 dB away from the simulation results but still meets the requirement of −15 dB for MIMO communication. The measured results show that the antenna can be used in MIMO short-distance communication system. © 2023, Electromagnetics Academy. All rights reserved.