A compact two-element multiple-input-multiple-output (MIMO) antenna with high isolation is proposed in this paper. It is based on a half-mode substrate-integrated-waveguide (SIW) cavity where three edges are shorted by metallic vias, and one edge is opened to radiate cavity energy into free space. Fed by coaxial ports, two antenna elements are constructed in the SIW cavity, and a narrow T-shaped slot is introduced to enhance the isolation between them. High port isolation can be achieved by adjusting the slot length although these antenna elements are connected with each other. A prototype has been fabricated and measured. With the compact cavity size of 0.22λ0 × 0.44λ0, the fabricated antenna achieves the operating frequency of 3.51 GHz, enhanced isolation of 18.0 dB, low envelope correlation coefficient of 0.006, peak gain of 5.2 dBi, and high efficiency of 82.6%. Therefore, the proposed MIMO antenna has potential applications for wireless communication.
2. Yang, S. and L. Hanzo, "Fifty years of MIMO detection: The road to large-scale MIMOs," IEEE Communication Surveys & Tutorials, Vol. 17, No. 4, 1941-1988, 4th Quart., 2015.
doi:10.1109/COMST.2015.2475242
3. Zhao, Y., F.-S. Zhang, L.-X. Cao, and D.-H. Li, "A compact dual band-notched MIMO diversity antenna for UWB wireless applications," Progress In Electromagnetics Research C, Vol. 89, 161-169, 2019.
doi:10.2528/PIERC18111902
4. Liu, F., Z. Xu, D. C. Ranasinghe, and C. Fumeaux, "Textile folded half-mode substrate-integrated cavity antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 15, 1693-1697, 2016.
doi:10.1109/LAWP.2016.2524458
5. Zhu, Y.-Z., "A novel circularly polarized half mode circular substrate integrated waveguide antenna using meandered strip feeding technique," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 26, No. 8, 668-673, 2016.
doi:10.1002/mmce.21016
6. Lou, Q., R. Wu, F.-G. Meng, and P. Yin, "Realizing frequency reconfigurable antenna by ferrite-loaded half-mode SIW," Microwave and Optical Technology Letters, Vol. 59, No. 6, 1365-1371, 2017.
doi:10.1002/mop.30549
7. Nguyen-Trong, N. and C. Fumeaux, "Half-mode substrate-integrated waveguides and their applications for antenna technology: A review of the possibilities for antenna design," IEEE Antennas Propagation Magazine, Vol. 60, No. 6, 20-31, Dec. 2018.
doi:10.1109/MAP.2018.2870587
8. Yan, S., P. J. Soh, and G. A. E. Vandenbosch, "Dual-band textile MIMO antenna based on substrate-integrated waveguide (SIW) technology," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 11, 4640-4647, Nov. 2015.
doi:10.1109/TAP.2015.2477094
9. Zhang, Y. and B. Niu, "Compact ultrawideband (UWB) slot antenna with wideband and high isolation for MIMO applications," Progress In Electromagnetics Research C, Vol. 54, 9-16, 2014.
doi:10.2528/PIERC14072304
10. Zhai, G., Z. N. Chen, and X. Qing, "Enhanced isolation of a closely spaced four-element MIMO antenna system using metamaterial mushroom," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 8, 3362-3370, Aug. 2015.
doi:10.1109/TAP.2015.2434403
11. Wang, Z., L. Zhao, A. Chen, and Y.-Z. Yin, "A second order decoupling design using a resonator and an interdigital capacitor for a MIMO antenna pair," Progress In Electromagnetics Research Letters, Vol. 67, 19-24, 2017.
doi:10.2528/PIERL17012301
12. Nadeem, I. and D. Choi, "Study on mutual coupling reduction technique for MIMO antennas," IEEE Access, Vol. 7, 563-586, 2019.
doi:10.1109/ACCESS.2018.2885558
13. Niu, B. and J.-H. Tan, "Bandwidth enhancement of low-profile SIW cavity antenna with bilateral slots," Progress In Electromagnetics Research Letters, Vol. 82, 25-32, 2019.
doi:10.2528/PIERL18102505
14. Niu, B.-J., J.-H. Tan, and S.-W. Wong, "Compact SIW cavity slot antenna with enhanced bandwidth and quasi-elliptic filtering response," Electronics Letters, Vol. 55, No. 2, 69-70, 2019.
doi:10.1049/el.2018.7619
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