volume | PIER Journals

Abstract

This paper introduces a 4-port antenna tailored for 5G, operating in the 4.4 to 7.25 GHz (Fractional Bandwidth is 48.9%) range with a 10 dB impedance bandwidth. The operating bandwidth includes the n79 band (4.4-5 GHz), 5G WLAN band (5.125-5.825 GHz), and Wi-Fi 6E band (5.925 to 7.125 GHz). Constructed on a compact FR4 substrate (0.057λ × 0.057λ × 0.0018 λ (where λ is the wavelength at 4.4 GHz), it exhibits robust performance in fabrication and measurements. The single antenna covers a total area as small as 20 × 17.6 mm², which enables the compactness of the MIMO antenna with a gain of up to 6 dBi and 85% radiation efficiency; it supports MIMO with a low correlation coefficient (< 0.02), high diversity gain (up to 9.98 dB), and minimal channel capacity loss (0.25 bps/Hz). The Total Active Reflective Coefficient (TARC) is computed to validate MIMO performance over the operating bandwidth. Featuring bidirectional radiation patterns in both E-plane and H-plane, the antenna is well suited for 5G applications, demonstrating potential for future wireless systems.

1. Chettri, Lalit and Rabindranath Bera, "A comprehensive survey on Internet of Things (IoT) toward 5G wireless systems," IEEE Internet of Things Journal, Vol. 7, No. 1, 16-32, 2019.

2. Khan, Ijaz, Qun Wu, Inam Ullah, Saeed Ur Rahman, Habib Ullah, and Kuang Zhang, "Designed circularly polarized two-port microstrip MIMO antenna for WLAN applications," Applied Sciences, Vol. 12, No. 3, 1068, 2022.

3. Malviya, Leeladhar, Rajib Kumar Panigrahi, and M. V. Kartikeyan, MIMO Antennas for Wireless Communication: Theory and Design, CRC Press, Boca Raton, FL, USA, 2020.
doi:10.1201/9781003080275

4. Qu, Longyue, Haiyan Piao, and Hyeongdong Kim, "Compact wideband MIMO mobile‐antenna system design using mode‐based decoupling techniques," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 29, No. 8, e21765, 2019.

5. Deng, Changjiang, Di Liu, and Xin Lv, "Tightly arranged four-element MIMO antennas for 5G mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 10, 6353-6361, 2019.

6. Kabiri, Yasin, Alejandro L. Borja, James R. Kelly, and Pei Xiao, "A technique for MIMO antenna design with flexible element number and pattern diversity," IEEE Access, Vol. 7, 86157-86167, 2019.

7. Kumar, Sumit, Amruta S. Dixit, Rajeshwari R. Malekar, Hema D. Raut, and Laxmikant K. Shevada, "Fifth generation antennas: A comprehensive review of design and performance enhancement techniques," IEEE Access, Vol. 8, 163568-163593, 2020.

8. Soltani, Saber and Ross D. Murch, "A compact planar printed MIMO antenna design," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 3, 1140-1149, 2015.

9. Chattha, Hassan Tariq, "4-port 2-element MIMO antenna for 5G portable applications," IEEE Access, Vol. 7, 96516-96520, 2019.

10. Al-Fayyadh, Hussein Qasim, Abdulghafor Abdulghafar Abdulhameed, Abdulkareem Swadi Abdullah, and Haider Mohammed Alsabbagh, "Flexible (2 x 1) MIMO antenna with electromagnetic band gap unit cell for WiMAX applications," Turkish Journal of Electrical Engineering and Computer Sciences, Vol. 25, No. 4, 3061-3072, 2017.
doi:10.3906/elk-1603-94

11. Kumar, Amit, Abdul Quaiyum Ansari, Binod Kumar Kanaujia, Jugul Kishor, and Sachin Kumar, "An ultra-compact two-port UWB-MIMO antenna with dual band-notched characteristics," AEU - International Journal of Electronics and Communications, Vol. 114, 152997, 2020.

12. Jha, Kumud Ranjan, Z. A. Pandit Jibran, Chitra Singh, and Satish Kumar Sharma, "4-port MIMO antenna using common radiator on a flexible substrate for sub-1 GHz, sub-6 GHz 5G NR, and Wi-Fi 6 applications," IEEE Open Journal of Antennas and Propagation, Vol. 2, 689-701, 2021.

13. Thummaluru, Sreenath Reddy, Mohammad Ameen, and Raghvendra Kumar Chaudhary, "Four-port MIMO cognitive radio system for midband 5G applications," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 8, 5634-5645, 2019.

14. Biswas, Arumita and Vibha Rani Gupta, "Design and development of low profile MIMO antenna for 5G new radio smartphone applications," Wireless Personal Communications, Vol. 111, No. 3, 1695-1706, 2020.

15. Kulkarni, Jayshri, Abdullah G. Alharbi, Arpan Desai, Chow-Yen-Desmond Sim, and Ajay Poddar, "Design and analysis of wideband flexible self-isolating MIMO antennas for sub-6 GHz 5G and WLAN smartphone terminals," Electronics, Vol. 10, No. 23, 3031, 2021.

16. Sun, Libin, Haigang Feng, Yue Li, and Zhijun Zhang, "Compact 5G MIMO mobile phone antennas with tightly arranged orthogonal-mode pairs," IEEE Transactions on Antennas and Propagation, Vol. 66, No. 11, 6364-6369, 2018.

17. Ramanujam, Rajkumar and Marichamy Perumalsamy, "An ultra‐thin flexible four port MIMO antenna for WBAN communications," Microwave and Optical Technology Letters, Vol. 64, No. 7, 1245-1251, 2022.

18. Paracha, Kashif Nisar, Sharul Kamal Abdul Rahim, Hassan Tariq Chattha, Saqer Saleh Aljaafreh, Sabih Ur Rehman, and Yew Chiong Lo, "Low-cost printed flexible antenna by using an office printer for conformal applications," International Journal of Antennas and Propagation, Vol. 2018, 3241581, 2018.

Dr. Purushothaman Janaki Ramal

Dr. Syed Nawab Syed Althaf

Dr. Kannan Vishnulakshmi

Dr. Palaniselvan Sundaravadivel

Dr. Rajesh Kumar Dhandap