This paper introduces new compact microstrip line fed dual-band printed MIMO antennas resonating at 28 GHz and 38 GHz which are appropriate for 5G mobile communications. The first design in this work is a two-element conventional rectangular microstrip patch antenna with inset feed intended for 28 GHz and 38 GHz bands. The second design is symmetric dual-band two-element MIMO slotted-rectangular patches via microstrip inset fed lines. The dual-band response is attained from inverted I-shaped slots inserted in main patches. The third design is symmetric dual-band four-element MIMO antenna with inverted I-shaped slotted rectangular patches. A slot formed DGS is inserted in the partial rectangular ground plane. The substrate size is 55 x 110 mm2, while the introduced antennas have very modest planar configurations and inhabit an insignificant area which make them fit easier within handset devices for the forthcoming 5G mobile communications. Better return losses and larger bandwidths are realized. The MIMO antennas have low mutual coupling without using any added constructions. The antenna systems offer appropriate values of directivity, gain, and radiation efficiency with anticipated reflection and correlation coefficient characteristics which are seemly for 5G mobile applications. The antenna systems are fabricated by a photolithography process that uses optic-radiation to copy the mask on a silicon slab by the aid of photoresist layers and measured using Vector Network Analyzer ZVA 67 (measures up to 67 GHz frequency) with a port impedance of 50 Ω.
1. Babu, K. V. and B. Anuradha, "Design of multi-band minkowski MIMO antenna to reduce the mutual coupling," Journal of King Saud University-Engineering Sciences, 2018.
2. Ashraf, N., O. M. Haraz, M. M. M. Ali, M. A. Ashraf, and S. A. S. Alshebili, "Optimized broadband and dual-band printed slot antennas for future millimeter wave mobile communication," AEU --- International Journal of Electronics and Communications, Vol. 70, 257-264, 2016. doi:10.1016/j.aeue.2015.12.005
3. Sulyman, A. I., A. T. Nassar, M. K. Samimi, G. R. MacCartney, T. S. Rappaport, and A. Alsanie, "Radio propagation path loss models for 5G cellular networks in the 28 GHz and 38 GHz millimeter-wave bands," IEEE Communications Magazine, Vol. 52, 78-86, 2014. doi:10.1109/MCOM.2014.6894456
4. Islam, M. T., M. N. Shakib, and N. Misran, "Broadband EH shaped microstrip patch antenna for wireless systems," Progress In Electromagnetics Research, Vol. 98, 163-173, 2009. doi:10.2528/PIER09082302
5. Hong, W., et al., "Multibeam antenna technologies for 5G wireless communications," IEEE Transactions on Antennas and Propagation, Vol. 65, 6231-6249, 2017. doi:10.1109/TAP.2017.2712819
6. Khattak, M. I., A. Sohail, U. Khan, Z. Barki, and G. Witjaksono, "Elliptical slot circular patch antenna array with dual band behaviour for future 5G mobile communication networks," Progress In Electromagnetics Research, Vol. 89, 133-147, 2019. doi:10.2528/PIERC18101401
7. Kumar, A., A. Q. Ansari, B. K. Kanaujia, J. Kishor, and N. Tewari, "Design of triple-band MIMO antenna with one band-notched characteristic," Progress In Electromagnetics Research, Vol. 86, 41-53, 2018. doi:10.2528/PIERC18051902
8. Alreshaid, A. T., O. Hammi, M. S. Sharawi, and K. Sarabandi, "A compact millimeter-wave slot antenna array for 5G standards," 2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP), 84-85, 2015. doi:10.1109/APCAP.2015.7374281
9. Ali, M. M. M. and A.-R. Sebak, "Directive antennas for future 5G mobile wireless communications," General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS), 1-4, 2017.
10. Hegazy, M. B. E. M. E. A., "Design and analysis of 28 GHz rectangular microstrip patch array antenna," WSEAS Transactions on Communications, Vol. 17, 1-9, 2018.
11. Rafique Umair, K. H., "Dual-band microstrip patch antenna array for 5G mobile communications," 2017 Progress In Electromagnetics Research Symposium --- Fall (PIERS | FALL), 55-59, Singapore, Nov. 19-22, 2017.
12. Amin, M. M., M. Mansor, N. Misran, and M. Islam, "28/38 GHz dual band slotted patch antenna with proximity-coupled feed for 5G communication," 2017 International Symposium on Antennas and Propagation (ISAP), 1-2, 2017.
13. Sunthari, P. M. and R. Veeramani, "Multiband microstrip patch antenna for 5G wireless applications using MIMO techniques," 2017 First International Conference on Recent Advances in Aerospace Engineering (ICRAAE), 1-5, 2017.
14. Ali, M. M. M. and A.-R. Sebak, "Design of compact millimeter wave massive MIMO dual-band (28/38 GHz) antenna array for future 5G communication systems," 2016 17th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 1-2, 2016. doi:10.1109/APUSNCURSINRSM.2018.8608394
15. Yan, K., P. Yang, F. Yang, L. Zeng, and S. Huang, "Eight-antenna array in the 5G smartphone for the dual-band MIMO system," 2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 41-42, 2018.
16. Hasan, M. N. and M. Seo, "Compact omnidirectional 28 GHz 2 x 2 MIMO antenna array for 5G communications," 2018 International Symposium on Antennas and Propagation (ISAP), 1-2, 2018. doi:10.1109/TAP.2017.2740963
17. Hong, W., K.-H. Baek, and S. Ko, "Millimeter-wave 5G antennas for smartphones: Overview and experimental demonstration," IEEE Transactions on Antennas and Propagation, Vol. 65, 6250-6261, 2017. doi:10.2528/PIERC18061803
18. Chaudhari, A. A. and R. K. Gupta, "A simple tri-band MIMO antenna using a single ground stub," Progress In Electromagnetics Research, Vol. 86, 191-201, 2018.
19. Balanis, C. A., Antenna Theory --- Analysis and Design, A John Wiley & Son, Inc., Publication, 2005.
20. Jetti, C. R. and V. R. Nandanavanam, "Compact MIMO antenna with WLAN band-notch characteristics for portable UWB systems," Progress In Electromagnetics Research, Vol. 88, 1-12, 2018. doi:10.1016/j.aeue.2018.09.045
21. Salamin, M. A., S. Das, and A. Zugari, "Design and realization of low profile dual-wideband monopole antenna incorporating a novel ohm (Ω) shaped DMS and semi-circular DGS for wireless applications," AEU --- International Journal of Electronics and Communications, Vol. 97, 45-53, 2018.
22. Sharawi, M. S., Printed MIMO Antenna Engineering, Artech House, 2014.