Design of a Microstrip Ultra Wideband MIMO Antenna for B5G Network Provisionally Accepted

Jinhua Zhang¹ Shi Dong¹ Deema M. Alsekait^2* Imran Khan³ Yung-Cheol Byun^4* Dag Øivind Madsen^5*

• ¹Zhoukou Normal University, China
• ²Princess Nourah bint Abdulrahman University, Saudi Arabia
• ³University of Engineering and Technology, Peshawar, Pakistan
• ⁴Jeju National University, Republic of Korea
• ⁵University of South-Eastern Norway (USN), Norway

With frequencies spanning from 3.1 to 10.6 GHz, ultra-wideband (UWB) technology is the most promising way to address the shortage of spectrum resources. Large system capacities, fast communication rates, and minimal system complexity are features of UWB technology. Nowadays, a lot of academics have researched UWB. MIMO and UWB together can reduce cochannel interference and multi-path fading while increasing the RF bandwidth availability. This paper proposes a novel ultra wideband MIMO antenna for beyond 5G (B5G) network. The proposed structure has small size and is capable to operate in various GHz frequencies. Simulation results show that the proposed antenna structure achieves high isolation of less than -22.6 dB, relative bandwidth of 118.31% and high radiation efficiency as compared with existing designs. In the operating frequency spectrum, mutual coupling reduces antenna isolation to less than -22.6 dB and ECC to less than 0.01. Over the whole working frequency range, the antenna gain remains constant at 4-6 dBi. However, at the three notch frequency bands, the gain decreases to 3.9 dBi, 3.7 dBi, and 3.3 dBi. The radiation efficiency is about 88% throughout the complete operating bandwidth and shows a concave trend in the notch frequency band. The performance of the proposed structure is also compared with measured results that validated its effectiveness. The antenna has S 11 <-10 dB within 2.9~11.3 GHz, and its S 21 < -22.6 dB within the working UWB bandwidth, and has 3.18~3.61 GHz, 5.05~5.86 GHz and 7.11~8.15 three notches in the GHz band.