volume | PIER Journals

Abstract

This paper proposes a compact UWB MIMO antenna with band-notched characteristics and high isolation. With a miniaturized footprint of 60 × 32 mm, the antenna covers the full UWB spectrum of 3.1-13 GHz. A core structural innovation lies in the design of a novel SRR metamaterial unit, which exhibits superior high-frequency decoupling capability by regulating electromagnetic wave propagation; combined with the synergistic decoupling mechanism of a meandered-line radiating patch and an I-shaped DGS for low-frequency isolation enhancement, the antenna achieves an excellent measured isolation (S₂₁) of better than -21 dB across the entire operating band. Additionally, four precise notched bands (3.3-3.4 GHz WiMAX, 4.4-5.0 GHz n79, 5.15-5.825 GHz WLAN, 7.9-8.4 GHz) are realized via strategically etched slots on radiating elements to suppress interference. Verified by measurements, the measured ECC is as low as below 0.018, and the diversity gain maintains stability near the ideal 10 dBi. The antenna exhibits stable radiation patterns throughout the impedance bandwidth, accompanied by outstanding diversity performance.

1. Zheng, Xuemei, Ziwei Zhao, Yunan Zhang, Tongchao Zhang, Ao Gui, and Han Wu, "A low-coupling broadband MIMO array antenna design for Ku-band based on metamaterials," Journal of Electromagnetic Engineering and Science, Vol. 24, No. 6, 666-673, 2024.
doi:10.26866/jees.2024.6.r.256 Google Scholar

2. Zheng, Xuemei, Linfei Yue, and Yunan Zhang, "A compact four-port axially symmetric UWB-MIMO antenna array: Metamaterial-integrated coplanar waveguide for broadband operation with high isolation," Progress In Electromagnetics Research C, Vol. 162, 58-69, 2025.
doi:10.2528/pierc25100105 Google Scholar

3. Jusoh, Muzammil, Mohd Faizal Bin Jamlos, Muhammad Ramlee Kamarudin, and Mohd Fareq Bin Abd Malek, "A MIMO antenna design challenges for UWB application," Progress In Electromagnetics Research B, Vol. 36, 357-371, 2012.
doi:10.2528/pierb11092701 Google Scholar

4. Su, Jinrong, Yanling Li, Xinwei Chen, Guorui Han, and Wenmei Zhang, "A compact triple band-notched quasi-self-complementary UWB MIMO antenna decoupled by SRRs," International Journal of Microwave and Wireless Technologies, Vol. 15, No. 7, 1251-1261, Sep. 2023.
doi:10.1017/s1759078722001325 Google Scholar

5. Gao, Mingming, Jiyu Wang, Jingchang Nan, and Xinxin Han, "Design of a compact triple-notch UWB-MIMO antenna," Journal of Electronic Measurement and Instrumentation, Vol. 36, No. 6, 144-151, 2022.
doi:10.13382/j.jemi.B2105000 Google Scholar

6. Mishra, N. K., J. Acharjee, V. Sharma, C. Tamrakar, and L. Dewangan, "Mutual coupling reduction between the cylindrical dielectric resonator antenna using split ring resonator based structure," AEU --- International Journal of Electronics and Communications, Vol. 154, 154305, Sep. 2022.
doi:10.1016/j.aeue.2022.154305 Google Scholar

7. Zheng, Xuemei and Xiuming Xu, "Design of planar ultra-wideband notch antenna," 2021 19th International Conference on Optical Communications and Networks (ICOCN), 1-3, Qufu, China, 2021.
doi:10.1109/icocn53177.2021.9563798

8. Li, J.-F., Q.-X. Chu, Z.-H. Li, and X.-X. Xia, "Compact dual band-notched UWB MIMO antenna with high isolation," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 9, 4759-4766, Sept. 2023.
doi:10.1109/tap.2013.2267653 Google Scholar

9. Wu, Aiting, Mingyang Zhao, Pengquan Zhang, and Zhonghai Zhang, "A compact four-port MIMO antenna for UWB applications," Sensors, Vol. 22, No. 15, 5788, 2022.
doi:10.3390/s22155788 Google Scholar

10. Saad, Ayman Ayd R. and Hesham A. Mohamed, "Conceptual design of a compact four-element UWB MIMO slot antenna array," IET Microwaves, Antennas & Propagation, Vol. 13, No. 2, 208-215, 2019.
doi:10.1049/iet-map.2018.5163 Google Scholar

11. Yang, L., Ming Xu, and Chun Li, "Four-element MIMO antenna system for UWB applications," Radioengineering, Vol. 28, No. 1, 60-67, 2019.
doi:10.13164/re.2019.0060 Google Scholar

12. Kumar, Sachin, Gwan Hui Lee, Dong Hwi Kim, Wahab Mohyuddin, Hyun Chul Choi, and Kang Wook Kim, "A compact four-port UWB MIMO antenna with connected ground and wide axial ratio bandwidth," International Journal of Microwave and Wireless Technologies, Vol. 12, No. 1, 75-85, 2020.
doi:10.1017/s1759078719000874 Google Scholar

13. Jairath, Kapil, Navdeep Singh, Vishal Jagota, and Mohammad Shabaz, "Compact ultrawide band metamaterial-inspired split ring resonator structure loaded band notched antenna," Mathematical Problems in Engineering, Vol. 2021, No. 1, 5174455, 2021.
doi:10.1155/2021/5174455 Google Scholar

14. Tang, Zhijun, Xiaofeng Wu, Jie Zhan, Shigang Hu, Zaifang Xi, and Yunxin Liu, "Compact UWB-MIMO antenna with high isolation and triple band-notched characteristics," IEEE Access, Vol. 7, 19856-19865, 2019.
doi:10.1109/access.2019.2897170 Google Scholar

15. Saraswat, Ritesh K. and Mithilesh Kumar, "A metamaterial hepta-band antenna for wireless applications with specific absorption rate reduction," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 29, No. 10, e21824, 2019.
doi:10.1002/mmce.21824 Google Scholar

16. Saraswat, Ritesh K. and Mithilesh Kumar, "A vertex-fed hexa-band frequency reconfigurable antenna for wireless applications," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 29, No. 10, e21893, 2019.
doi:10.1002/mmce.21893 Google Scholar

17. Saraswat, Ritesh Kumar and Mithilesh Kumar, "Implementation of metamaterial loading to miniaturized UWB dipole antenna for WLAN and WiMAX applications with tunability characteristics," IETE Journal of Research, Vol. 68, No. 3, 2022-2035, 2022.
doi:10.1080/03772063.2019.1684845 Google Scholar

Dr. Xuemei Zheng

Dr. Yunan Zhang

Mr. Linfei Yue