volume | PIER Journals

Abstract

This paper proposes a novel four-port MIMO antenna specifically designed for millimeter-wave (mm-wave) 5G applications. The antenna features a compact symmetric layout measuring 22 mm × 22 mm, corresponding to approximately 2.7λ × 2.7λ at 37 GHz. The prototype is fabricated on a Rogers RT Duroid 5880 substrate (ε_r = 2.2, tanδ = 0.0009, h = 0.8 mm) to ensure low loss and stable performance at high frequencies. The antenna operates effectively over two targeted frequency bands, 37-41 GHz and 42-43.5 GHz, making it suitable for high-data-rate, short-range communication systems in emerging 5G networks. The structure is evolved through multiple design stages using strategically placed curved parasitic elements to achieve dual-band operation, high isolation, and enhanced gain. Experimental validation using a vector network analyzer and anechoic chamber confirms good agreement between simulated and measured S-parameters, with isolation better than -20 dB. The antenna demonstrates a measured gain between 9.3 and 9.7 dBi, with simulated peaks up to 11 dBi. Far-field pattern measurements exhibit stable bidirectional radiation with low cross-polarization and well-defined main lobes at both 38 GHz and 42 GHz. MIMO performance metrics such as ECC < 0.01, DG ≈ 10 dB, MEG ≈ -3 dB, and CCL < 0.4 bps/Hz confirm efficient multi-port operation. The proposed antenna thus offers a compact, high-isolation, high-gain solution for next-generation mm-wave 5G MIMO systems.

1. Ali, Wael, Sudipta Das, Hicham Medkour, and Soufian Lakrit, "Planar dual-band 27/39 GHz millimeter-wave MIMO antenna for 5G applications," Microsystem Technologies, Vol. 27, No. 1, 283-292, 2021.
doi:10.1007/s00542-020-04951-1

2. Khalid, Mahnoor, Syeda Iffat Naqvi, Niamat Hussain, MuhibUr Rahman, Fawad, Seyed Sajad Mirjavadi, Muhammad Jamil Khan, and Yasar Amin, "4-Port MIMO antenna with defected ground structure for 5G millimeter wave applications," Electronics, Vol. 9, No. 1, 71, 2020.
doi:10.3390/electronics9010071

3. Aggarwal, Reena, Ajay Roy, and Rajeev Kumar, "Millimeter wave antennas: A state-of-the-art survey of recent developments, principles, and applications," Progress In Electromagnetics Research B, Vol. 104, 147-169, 2024.
doi:10.2528/pierb23102401

4. Patel, Amit, Arpan Desai, Issa Elfergani, Alpesh Vala, Hiren Mewada, Keyur Mahant, Sagar Patel, Chemseddine Zebiri, Jonathan Rodriguez, and Esraa Ali, "UWB CPW fed 4-port connected ground MIMO antenna for sub-millimeter-wave 5G applications," Alexandria Engineering Journal, Vol. 61, No. 9, 6645-6658, 2022.
doi:10.1016/j.aej.2021.12.015

5. Rahman, Saifur, Xin-Cheng Ren, Ahsan Altaf, Muhammad Irfan, Mujeeb Abdullah, Fazal Muhammad, Muhammad Rizwan Anjum, Salim Nasar Faraj Mursal, and Fahad Salem AlKahtani, "Nature inspired MIMO antenna system for future mmWave technologies," Micromachines, Vol. 11, No. 12, 1083, 2020.
doi:10.3390/mi11121083

6. Megahed, Amany A., Ehab H. Abdelhay, Mohamed Abdelazim, and Heba Y. M. Soliman, "5G millimeter wave wideband MIMO antenna arrays with high isolation," EURASIP Journal on Wireless Communications and Networking, Vol. 2023, No. 1, 61, 2023.
doi:10.1186/s13638-023-02267-y

7. Singh, S. Vikram, Janendra Pratap, Akanksha Singh, Smita Sharma, and Shubhi Gupta, "Isolation enhancement of MIMO antenna for millimeter wave applications," 2021 2nd International Conference on Intelligent Engineering and Management (ICIEM), 466-470, London, United Kingdom, 2021.
doi:10.1109/iciem51511.2021.9445333

8. Shariff, Parveez, Pallavi R. Mane, Pradeep Kumar, Tanweer Ali, and M. Gulam Nabi Alsath, "Planar MIMO antenna for mmWave applications: Evolution, present status & future scope," Heliyon, Vol. 9, No. 2, e13362, 2023.
doi:10.1016/j.heliyon.2023.e13362

9. Jayanthi, K. and A. M. Kalpana, "Design of six element MIMO antenna with enhanced gain for 28/38 GHz mm-Wave 5G wireless application," Computer Systems Science and Engineering, Vol. 46, No. 2, 1689-1705, 2023.
doi:10.32604/csse.2023.034613

10. Sabek, Ayman R., Wael A. E. Ali, and Ahmed A. Ibrahim, "Minimally coupled two-element MIMO antenna with dual band (28/38 GHz) for 5G wireless communications," Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 43, No. 3, 335-348, 2022.
doi:10.1007/s10762-022-00857-3

11. Patel, Amit, Alpesh Vala, Arpan Desai, Issa Elfergani, Hiren Mewada, Keyur Mahant, Chemseddine Zebiri, Dharmendra Chauhan, and Jonathan Rodriguez, "Inverted-L shaped wideband MIMO antenna for millimeter-wave 5G applications," Electronics, Vol. 11, No. 9, 1387, 2022.
doi:10.3390/electronics11091387

12. Iqbal, Amjad, Abdul Basir, Amor Smida, Nazih Khaddaj Mallat, Issa Elfergani, Jonathan Rodriguez, and Sunghwan Kim, "Electromagnetic bandgap backed millimeter-wave MIMO antenna for wearable applications," IEEE Access, Vol. 7, 111135-111144, 2019.
doi:10.1109/access.2019.2933913

13. Munir, Mehr E., Saad Hassan Kiani, Huseyin Serif Savci, Mohamed Marey, Jehanzeb Khan, Hala Mostafa, and Naser Ojaroudi Parchin, "A four element mm-Wave MIMO antenna system with wide-band and high isolation characteristics for 5G applications," Micromachines, Vol. 14, No. 4, 776, 2023.
doi:10.3390/mi14040776

14. Esmail, Bashar A. F. and Slawomir Koziel, "Design and optimization of metamaterial-based highly-isolated MIMO antenna with high gain and beam tilting ability for 5G millimeter wave applications," Scientific Reports, Vol. 14, No. 1, 3203, 2024.
doi:10.1038/s41598-024-53723-8

15. Elalaouy, Ouafae, Mohammed El Ghzaoui, and Jaouad Foshi, "Mutual coupling reduction of a two-port MIMO antenna using defected ground structure," e-Prime --- Advances in Electrical Engineering, Electronics and Energy, Vol. 8, 100557, 2024.
doi:10.1016/j.prime.2024.100557

16. Abbas, Mohamed Atef, Abdelmegid Allam, Abdelhamid Gaafar, Hadia M. Elhennawy, and Mohamed Fathy Abo Sree, "Compact UWB MIMO antenna for 5G millimeter-wave applications," Sensors, Vol. 23, No. 5, 2702, 2023.
doi:10.3390/s23052702

17. Alfakhri, Abdullah, "Dual polarization and mutual coupling improvement of UWB MIMO antenna with cross shape decoupling structure," e-Prime --- Advances in Electrical Engineering, Electronics and Energy, Vol. 4, 100130, 2023.
doi:10.1016/j.prime.2023.100130

18. Murthy, Nimmagadda, "Improved isolation metamaterial inspired mm-Wave MIMO dielectric resonator antenna for 5G application," Progress In Electromagnetics Research C, Vol. 100, 247-261, 2020.
doi:10.2528/pierc19112603

19. Kumar, Ashok, Ashok Kumar, Ping Jack Soh, and Arjun Kumar, "Design consideration, challenges and measurement aspects of 5G mm-Wave antennas: A review," Progress In Electromagnetics Research B, Vol. 96, 39-66, 2022.
doi:10.2528/pierb22052002

20. Tariq, Saba, Syeda I. Naqvi, Niamat Hussain, and Yasar Amin, "A metasurface-based MIMO antenna for 5G millimeter-wave applications," IEEE Access, Vol. 9, 51805-51817, 2021.
doi:10.1109/access.2021.3069185

21. Hussain, Niamat and Nam Kim, "Integrated microwave and mm-Wave MIMO antenna module with 360° pattern diversity for 5G internet of things," IEEE Internet of Things Journal, Vol. 9, No. 24, 24777-24789, 2022.
doi:10.1109/jiot.2022.3194676

22. Abo-Elhassan, May Abd, Asmaa Elsayed Farahat, and Khalid Fawzy Ahmed Hussein, "Millimetric-wave quad-band MIMO antennas for future generations of mobile communications," Progress In Electromagnetics Research B, Vol. 95, 41-60, 2022.
doi:10.2528/pierb22010101

23. Ali, Wael A. E., Ahmed A. Ibrahim, and Ashraf E. Ahmed, "Dual-band millimeter wave 2 × 2 MIMO slot antenna with low mutual coupling for 5G networks," Wireless Personal Communications, Vol. 129, No. 4, 2959-2976, 2023.
doi:10.1007/s11277-023-10267-w

24. Sokunbi, Oludayo, Hussein Attia, Abubakar Hamza, Atif Shamim, Yiyang Yu, and Ahmed A. Kishk, "New self-isolated wideband MIMO antenna system for 5G mm-Wave applications using slot characteristics," IEEE Open Journal of Antennas and Propagation, Vol. 4, 81-90, 2023.
doi:10.1109/ojap.2023.3234341

25. Alnemr, Fadwa, Mai Foua’ad Ahmed, and Abdulhamed Abdulmonem Shaalan, "A compact 28/38 GHz MIMO circularly polarized antenna for 5G applications," Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 42, No. 3, 338-355, 2021.
doi:10.1007/s10762-021-00770-1

26. El Halaoui, Mustapha, Laurent Canale, Adel Asselman, and Georges Zissis, "Dual-band 28/38 GHz inverted-F array antenna for fifth generation mobile applications," Proceedings, Vol. 63, No. 1, 53, 2020.
doi:10.3390/proceedings2020063053

27. Tadesse, A. D., O. P. Acharya, and S. Sahu, "A compact planar four-port MIMO antenna for 28/38 GHz millimeter-wave 5G applications," Advanced Electromagnetics, Vol. 11, No. 3, 16-25, 2022.
doi:10.7716/aem.v11i3.1947

28. Elsharkawy, Rania R., Khalid F. A. Hussein, and Asmaa E. Farahat, "Dual-band (28/38 GHz) compact MIMO antenna system for millimeter-wave applications," Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 44, No. 11, 1016-1037, 2023.
doi:10.1007/s10762-023-00943-0

29. Hasan, Md. Nazmul, Shahid Bashir, and Son Chu, "Dual band omnidirectional millimeter wave antenna for 5G communications," Journal of Electromagnetic Waves and Applications, Vol. 33, No. 12, 1581-1590, 2019.
doi:10.1080/09205071.2019.1617790

30. Tiwari, Rakesh N., K. Geetha Malya, Girigari Nandini, P. Baby Nikhitha, Deepti Sharma, Prabhakar Singh, and Pradeep Kumar, "Quad-band 1 × 4 linear MIMO antenna for millimeter-wave, wearable and biomedical telemetry applications," Sensors, Vol. 24, No. 14, 4427, 2024.
doi:10.3390/s24144427

31. Sharma, Manish, Bhaskara Rao Perli, Lovish Matta, Tathababu Addepalli, Kanhaiya Sharma, and Fadi N. Sibai, "Flexible four-port MIMO antenna for 5G NR-FR2 tri-band mmWave application with SAR analysis," Scientific Reports, Vol. 14, No. 1, 29100, 2024.
doi:10.1038/s41598-024-79859-1

32. Munir, Mehr E., Moustafa M. Nasralla, and Maged Abdullah Esmail, "Four port tri-circular ring MIMO antenna with wide-band characteristics for future 5G and mmWave applications," Heliyon, Vol. 10, No. 8, e28714, 2024.
doi:10.1016/j.heliyon.2024.e28714

Mr. Manish Kumar Dabhade

Dr. Krishna Keshavrao Warhade