volume | PIER Journals

Abstract

To meet the requirements of antenna miniaturization and wide impedance bandwidth in UWB systems, a novel compact UWB Vivaldi antenna is presented in this work. Based on the conventional planar Vivaldi configuration, the radiating arms are etched with elliptical slots, and the front end of the tapered slot is loaded with concentric arc parasitic patches to regulate the surface current distribution and enhance broadband impedance matching. Simulated and measured results demonstrate that the presented antenna achieves a reflection coefficient below -10 dB over the frequency range of 6.61-21.06 GHz, corresponding to a relative bandwidth of 104.45%, with a compact size of 14.5 × 19.8 × 0.51 mm³, while maintaining a single-layer planar structure without increasing structural complexity. It is also indicated that stable end-fire radiation characteristics and low cross-polarization levels are maintained at several representative frequencies. The presented design simultaneously realizes significant size reduction and ultra-wide impedance bandwidth, providing a simple and practical solution for compact UWB Vivaldi antenna applications.

1. Gibson, P. J., "The Vivaldi aerial," 1979 9th European Microwave Conference, 101-105, Brighton, UK, 1979.
doi:10.1109/EUMA.1979.332681

2. Hossain, Ababil and Anh-Vu Pham, "A novel gain-enhanced miniaturized and lightweight Vivaldi antenna," IEEE Transactions on Antennas and Propagation, Vol. 71, No. 12, 9431-9439, 2023.
doi:10.1109/tap.2023.3310611 Google Scholar

3. Zhang, Hao and Fang Zhang, "A novel ultrawideband miniature Vivaldi antenna with sawtooth outer edges and inclined elliptical slots," IEEE Antennas and Wireless Propagation Letters, Vol. 23, No. 9, 2708-2712, 2024.
doi:10.1109/lawp.2024.3405007 Google Scholar

4. Liu, Xiaoyu, Yongzhong Zhu, and Wenxuan Xie, "Miniaturized ultrawideband circularly polarized antenna with folded arms inspired by the conventional Vivaldi antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 22, No. 12, 2768-2772, 2023.
doi:10.1109/lawp.2023.3275322 Google Scholar

5. Yin, Zhangfei, Guoqiang He, Xue-Xia Yang, and Steven Gao, "Miniaturized ultrawideband half-mode Vivaldi antenna based on mirror image theory," IEEE Antennas and Wireless Propagation Letters, Vol. 19, No. 4, 695-699, 2020.
doi:10.1109/lawp.2020.2977503 Google Scholar

6. Honari, Mohammad Mahdi, Mohammad Saeid Ghaffarian, and Rashid Mirzavand, "Miniaturized antipodal Vivaldi antenna with improved bandwidth using exponential strip arms," Electronics, Vol. 10, No. 1, 83, 2021.
doi:10.3390/electronics10010083 Google Scholar

7. Zhao, Guoqiang, Yu Xiao, Weijun Huang, Shiyou Xu, and Zengping Chen, "Compact and gain-enhanced Vivaldi antenna design using nonuniform slot profile optimization and aperture dielectric loading," IEEE Antennas and Wireless Propagation Letters, Vol. 24, No. 7, 1570-1574, 2025.
doi:10.1109/lawp.2025.3534205 Google Scholar

8. Wu, Bian, Xiao-Yuan Sun, Hao-Ran Zu, Hong-Hao Zhang, and Tao Su, "Transparent ultrawideband halved coplanar Vivaldi antenna with metal mesh film," IEEE Antennas and Wireless Propagation Letters, Vol. 21, No. 12, 2532-2536, 2022.
doi:10.1109/lawp.2022.3200455 Google Scholar

9. Lalitha, K. and J. Manjula, "Design of UWB antipodal Vivaldi antenna with parasitic patch for microwave head imaging system," 2022 International Conference on Computing, Communication, Security and Intelligent Systems (IC3SIS), 1-6, Kochi, India, 2022.
doi:10.1109/IC3SIS54991.2022.9885397

10. Hossain, Ababil, Samuel Wagner, Stephen Pancrazio, and Anh-Vu Pham, "An electrically highly compact ultra-wideband Vivaldi antenna with substantial gain performance," IEEE Open Journal of Antennas and Propagation, Vol. 6, No. 6, 1936-1947, 2025.
doi:10.1109/ojap.2025.3608782 Google Scholar

11. Gupta, Kunal, V. Anjitha, Athul O. Asok, and Sukomal Dey, "Design of an ultra-wideband antipodal Vivaldi antenna for deep ground penetration and high-resolution through-wall imaging," 2025 IEEE Space, Aerospace and Defence Conference (SPACE), 1-5, Bangalore, India, 2025.
doi:10.1109/SPACE65882.2025.11171106

12. Qin, Zhiyao, Shunfeng Cao, Weiheng Li, and Qiulin Huang, "A miniaturized ultra-wideband ground penetrating radar antenna based on the Vivaldi structure," Progress In Electromagnetics Research C, Vol. 156, 141-146, 2025.
doi:10.2528/pierc25041602 Google Scholar

13. Pisa, Stefano, Federico Pastori, Renato Cicchetti, Emanuele Piuzzi, Orlandino Testa, Erika Pittella, Andrea Cicchetti, Paolo D'Atanasio, and Alessandro Zambotti, "An antipodal Vivaldi antenna for a drone-mounted ground probing radar," Progress In Electromagnetics Research M, Vol. 123, 53-61, 2024.
doi:10.2528/pierm23110603 Google Scholar

14. Bhavani, Maddirala Vijaya Lakshmi, Divya Chaturvedi, Tiruganesh Lanka, Tella Anil Raju, Goutam Rana, and Arvind Kumar, "A non-invasive microwave imaging system for breast tumor detection using a high gain Vivaldi antenna array sensor," IEEE Sensors Journal, Vol. 25, No. 17, 32631-32640, 2025.
doi:10.1109/jsen.2025.3588605 Google Scholar

15. Zhao, L. L., A. D. Li, C. W. Li, Y. M. Wang, M. X. Zheng, Dengyang Song, C. L. Liu, Yongtao Liang, Huiling Zhao, C. F. Hu, and Tao Ma, "A miniaturized antipodal Vivaldi antenna for high-power design in X-band," Progress In Electromagnetics Research M, Vol. 129, 105-110, 2024.
doi:10.2528/pierm24090801 Google Scholar

16. Birwal, Amit, Kamlesh Patel, and Sanjeev Singh, "A directional wide-band antipodal Vivaldi antenna for imaging applications," Progress In Electromagnetics Research C, Vol. 127, 227-237, 2022.
doi:10.2528/pierc22102201 Google Scholar

17. Parveen, Farhana and Parveen Wahid, "Design of miniaturized antipodal Vivaldi antennas for wideband microwave imaging of the head," Electronics, Vol. 11, No. 14, 2258, 2022.
doi:10.3390/electronics11142258 Google Scholar

18. Wang, Binwen, Hui Ning, Hao Cai, Qilong Liu, Yan Wang, and Youjie Yan, "Pulse radiation characteristics prediction method of Vivaldi antenna based on dipole array," Applied Computational Electromagnetics Society Journal (ACES), Vol. 39, No. 5, 422-432, 2024.
doi:10.13052/2024.aces.j.390506 Google Scholar

Mr. Yi Si

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Dr. Rui Wu

Dr. Linzi Wang