Abstract
A compact MIMO antenna with enhanced isolation and the ability to switch the frequency bands is an attractive candidate for the current multifunctional high-speed portable wireless devices. To achieve this objective, a simple and novel compact dual-mode 4-port MIMO configuration for WiMAX and WLAN standards has been introduced in this work. The compactness of the MIMO geometry (34 mm × 34 mm) is due to compact switchable curve-shaped monopoles arranged closely over a loop-shaped continuous ground plane. The ground plane is defected by etching open-ended slots to suppress the surface current flow between the elements. As antenna elements switch between mode-1 (WiMAX band) and mode-2 (WLAN band), the DGS slots are also switchable to enhance isolation across both bands. The switchable DGS slots function as bandstop filters and thus isolate the elements by 40 and 41 dB in the accomplished frequency bands. The intented MIMO antenna reports a − 10 dB return loss bandwidths of 400 MHz (3.3–3.7 GHz) and 1100 MHz (4.75–5.85 GHz) in mode-1 and mode-2, respectively. The diversity metrics of envelope correlation coefficient < 0.002, diversity gain ≈ 10 dB, total active reflection coefficient < − 10 dB, and channel capacity loss < 0.4 b/s/Hz, ensure excellent diversity/MIMO performance. The optimized 4-port MIMO configuration is fabricated, and measured results are compared with the simulated ones to validate the introduced technique. The MIMO antenna's compact form factor and excellent antenna/diversity characteristics confirm its potentiality for use in portable multifunctional wireless devices.
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References
Jensen, M. A., & Wallace, J. W. (2004). A review of antennas and propagation for MIMO wireless communications. IEEE Transactions on Antennas and Propagation, 52(11), 2810–2824. https://doi.org/10.1109/TAP.2004.835272
Bejarano, O., & Knightly, E. W. (2013). IEEE 802.11ac: From channelization to multi-user MIMO. IEEE Communications Magazine, 51(10), 84–90. https://doi.org/10.1109/MCOM.2013.6619570
Chung, K. L., Chen, L., Lai, G., Zheng, K., & Wang, Z. (2023). Three-element circularly polarized MIMO antenna with self-decoupled probing method for B5G-V2X communications. Alexandria Engineering Journal, 70, 553–567. https://doi.org/10.1016/j.aej.2023.02.044
Upadhyaya, T., Sorathiya, V., Al Shathri, S., El Shafai, W., Patel, U., Pandya, K. V., & Armghan, A. (2023). Quad—Port MIMO antenna with high isolation characteristics for sub 6-GHz 5G NR communication. Scientific Reports. https://doi.org/10.1038/s41598-023-46413-4
Sujanth Narayan, K. G., Baskaradas, J. A., & Rajesh Kumar, D. (2021). Design of a CPW-fed compact MIMO antenna for next generation vehicle to everything (V2X) communication. Wireless Personal Communications, 120(3), 2179–2200.
Wu, T., Wang, M. J., & Chen, J. (2022). Decoupling of MIMO antenna array based on half-mode substrate integrated waveguide with neutralization lines. AEU—International Journal of Electronics and Communications, 157, 154416. https://doi.org/10.1016/j.aeue.2022.154416
Cao, X., Xia, Y., Wu, L., & Wu, X. (2022). Tri-band MIMO antenna design based on characteristic modes manipulation. AEU—International Journal of Electronics and Communications, 155(July), 154318. https://doi.org/10.1016/j.aeue.2022.154318
Saha, P. B., Ghoshal, D., Dash, R. K., & Roy, S. (2022). Neutralizing line based triple-band MIMO antenna with polarization diversity for WLAN/C/X band usage. International Journal of Electronics. https://doi.org/10.1080/00207217.2021.2025453
Kumar, A., De, A., & Jain, R. K. (2023). Novel H-shaped EBG in E-plane for isolation enhancement of compact CPW-fed two-port UWB MIMO antenna. IETE Journal of Research, 69(9), 5986–5992. https://doi.org/10.1080/03772063.2021.1986147
Tan, X., Wang, W., Wu, Y., Liu, Y., & Kishk, A. A. (2019). Enhancing isolation in dual-band meander-line multiple antenna by employing split EBG structure. IEEE Transactions on Antennas and Propagation, 67(2), 2769–2774. https://doi.org/10.1109/TAP.2019.2897489
Karthigaiveni, S., Reddy, M. A., & Pandeeswari, R. (2023). Aperture coupled four element MIMO antenna loaded with NBSRR superstrates for 5G wireless communications. Wireless Personal Communications. https://doi.org/10.1007/s11277-023-10359-7
Khan, D., Ahmad, A., & Choi, D. Y. (2024). Dual-band 5G MIMO antenna with enhanced coupling reduction using metamaterials. Scientific Reports, 14(1), 1–16. https://doi.org/10.1038/s41598-023-50446-0
Kethavathu, S. N., Singam, A., & Muthusamy, P. (2021). Compact symmetrical slot coupled linearly polarized two/four/eight element MIMO bowtie DRA for WLAN applications. AEU—International Journal of Electronics and Communications, 135(October 2020), 153729. https://doi.org/10.1016/j.aeue.2021.153729
Xi, S., Cai, J., Shen, L., Li, Q., & Liu, G. (2023). Dual-band MIMO antenna with enhanced isolation for 5G NR application. Micromachines. https://doi.org/10.3390/mi14010095
Tran, H. H., & Nguyen-Trong, N. (2021). Performance enhancement of MIMO patch antenna using parasitic elements. IEEE Access, 9, 30011–30016. https://doi.org/10.1109/ACCESS.2021.3058340
Ayinala, K. D., & Sahu, P. K. (2021). Isolation enhanced compact dual-band quad-element MIMO antenna with simple parasitic decoupling elements. AEUE—International Journal of Electronics and Communications, 142, 154013. https://doi.org/10.1016/j.aeue.2021.154013
Tan, X., Wang, W., Wu, Y., Liu, Y., Kishk, A. A., & Wang, H. (2020). Enhancing isolation and bandwidth in planar monopole multiple antennas using thin inductive line resonator. AEU—International Journal of Electronics and Communications. https://doi.org/10.1016/j.aeue.2020.153094
Ameen, M., Chaudhary, R. K., & Member, S. (2023). Isolation enhancement of metamaterial-inspired two-port MIMO antenna using hybrid techniques. IEEE Transactions on Circuits and Systems II: Express Briefs, 70(6), 1966–1970. https://doi.org/10.1109/TCSII.2023.3237831
Jha, P., Kumar, A., & De, A. (2023). Two-port miniaturized textile antenna for 5G and WLAN applications. International Journal of Microwave and Wireless Technologies, 15(8), 1443–1452.
Kumar, A., De, A., & Jain, R. K. (2023). Two-port antenna based on shorting pins and open-ended slots with T-shaped stub for isolation enhancement. IETE Journal of Research. https://doi.org/10.1080/03772063.2023.2208554
Wang, W., Wu, Y., Member, S., Wang, W., & Yang, Y. (2021). Isolation enhancement in dual-band monopole antenna for 5G applications. IEEE Transactions on Circuits and Systems II: Express Briefs, 68(6), 1867–1871. https://doi.org/10.1109/TCSII.2020.3040164
Sharawi, M. S. (2017). Current misuses and future prospects for printed multiple-input, multiple-output antenna systems [Wireless corner]. IEEE Antennas and Propagation Magazine, 59(2), 162–170. https://doi.org/10.1109/MAP.2017.2658346
Gupta, P., Bharti, M., & Kumar, A. (2022). Compact CPW fed four port MIMO antenna for UWB applications with Wi-Fi/ISM/WLAN Band Notch characteristics. Journal of Engineering Research, ICMET Special Issue. https://doi.org/10.36909/jer.ICMET.1719
Yang, C., Lu, K., & Leung, K. W. (2022). Dielectric decoupler for compact MIMO antenna systems. IEEE Transactions on Antennas and Propagation, 70(8), 6444–6454. https://doi.org/10.1109/TAP.2022.3177555
Kambali, V., Abegaonkar, M., Basu, A., & Design, A. A. (2017). Frequency reconfigurable compact MIMO antenna for WLAN application. In 2017 international symposium on antennas and propagation (ISAP) (pp. 1–2). IEEE.
Pant, A., Singh, M., & Parihar, M. S. (2021). A frequency reconfigurable/switchable MIMO antenna for LTE and early 5G applications. AEU—International Journal of Electronics and Communications, 131(January), 153638. https://doi.org/10.1016/j.aeue.2021.153638
Islam, H., Das, S., Ali, T., Bose, T., Prakash, O., & Kumar, P. (2022). A frequency reconfigurable MIMO antenna with bandstop filter decoupling network for cognitive communication. Sensors, 22(18), 6937.
Thummaluru, S. R., Kumar, R., & Chaudhary, R. K. (2019). Isolation and frequency reconfigurable compact MIMO antenna for wireless local area network applications. IET Microwaves, Antennas & Propagation, 13(4), 519–525. https://doi.org/10.1049/iet-map.2018.5895
Ali, W. A. E., Ashraf, M. I., & Salamin, M. A. (2021). A dual-mode double-sided 4 × 4 MIMO slot antenna with distinct isolation for WLAN/WiMAX applications. Microsystem Technologies, 27(3), 967–983. https://doi.org/10.1007/s00542-020-04984-6
Ray, K. P. (2008). Design aspects of printed monopole antennas for ultra-wide band applications. International Journal of Antennas and Propagation, 2008, 1–8. https://doi.org/10.1155/2008/713858
Acknowledgements
I acknowledge the Electrical Engineering and Electronics and Communication Engineering departments of NIT, Rourkela, to provide HFSS Software, Vector Network Analyzer (VNA), and an anechoic chamber to model and test the proposed MIMO antenna structure.
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The first author, Kabir Das Ayinala, is a Doctoral research scholar at the National Institute of Technology, Rourkela, India, and the second author, Prasanna Kumar Sahu, is the supervisor of the first author. All the authors have jointly contributed to this research. As the authors are students and guides, respectively, the contributions of all towards the preparation of the manuscript are significant.
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Ayinala, K.D., Sahu, P.K. Isolation Enhanced Compact Dual-Mode 4-Port MIMO Design Using Slot-Based Switchable DGS Decoupling Filters. Wireless Pers Commun 135, 805–833 (2024). https://doi.org/10.1007/s11277-024-11075-6
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DOI: https://doi.org/10.1007/s11277-024-11075-6