Abstract

Modern defense communication and radar systems require a compact, wideband, and high-efficiency antennas those are capable of operating across multiple frequency bands. The paper presents the design and realization of a compact semi-circular ultra-wideband (UWB) microstrip antenna with a modified defected ground structure (DGS), consisting of a rectangular notch to enhance impedance bandwidth and radiation characteristics. The proposed antenna simulated in CST studio and also fabricated on FR-4 substrate of size 30 × 15 × 0.8 mm³, providing a lightweight structure suitable for portable defense equipment and also in the radar system. The antenna operates within two broad frequency regions, 2.74-3.37 GHz and 5.62-20.07 GHz, covering portions of the S, C, X, and Ku bands widely used in radar, surveillance, and satellite communication systems. Structural modifications, including chamfered patch edges and a C-shaped slot, collectively improve the surface-current distribution, suppress surface-wave effects, and enhance the impedance bandwidth, resulting in two distinct operating bands of 2.74–3.37 GHz and 5.62–20.07 GHz, with fractional bandwidths of 20.62% and 112.5%, respectively, and a peak gain of 4.4 dB, and maximum simulated total efficiency of approximately 98%. The measured and simulated results show reasonable agreement, validating the antenna’s ultra-wideband behavior and stable radiation performance. Due to its compact size, coverage across portions of multiple microwave bands, and high efficiency, the proposed antenna is a strong candidate for next-generation multi-band defense communication and sensing applications.

Keywords

Compact Antenna, Defense Systems, Defected Ground Structure, Multiband Communication, Ultra- Wideband (UWB),

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References

  1. Z. Changlin, Z. Zhan, Q. Xuebing, Y. Hongtao, Z. Weidong, (2008) Research on the electromagnetic environment effect on wireless communication systems. In 2008 8th International Symposium on Antennas, Propagation and EM Theory, IEEE, Kunming. https://doi.org/10.1109/ISAPE.2008.4735510
  2. V. Prasad Kodali, (2010) Engineering electromagnetic compatibility, 2nd edition.
  3. IEC 61000-4-20 Electromagnetic Compatibility (EMC) - Part4: Testing and measurement techniques, Section20: Emission and immunity testing in transverse electromagnetic (TEM) waveguides, International Electrotechnical Commission, Tech. Rep., 2003.
  4. J.S. McLean, R. Sutton, A. Medina, H. Foltz, J.F. Li, The experimental characterization of UWB antennas via frequency-domain measurements. IEEE Antennas and Propagation Magazine, 49(6), (2007) 192-202. https://doi.org/10.1109/MAP.2007.4455900
  5. M.V. Yadav, L.P. Fernandes, S.V. Yadav, T. Ali, D. Yadav, V. Singh, K.P. bhati, Broadband Lumped Mirror Array mmWave Antenna for Wireless and Defense Systems. Journal of Electrical and Computer Engineering, 2025(1), (2025) 3441031. https://doi.org/10.1155/jece/3441031
  6. C.R. Paul, (2006). Introduction to Electromagnetic Compatibility. John Wiley & Sons: Hoboken, NJ, USA,
  7. M. Siddeq, M. Satyanarayana, A New Printed Monopole Antenna as EMI Sensor. International Journal of Engineering Research & Technology (IJERT), 2(10), (2013) 2694-2697.
  8. O.P. Kumar, T. Ali, P. Kumar, A Novel Corner Etched Rectangular Shaped Ultrawideband Antenna Loaded with Truncated Ground Plane for Microwave Imaging: OP Kumar et al. Wireless Personal Communications, 130(3), (2023) 2241-2259. https://doi.org/10.1007/s11277-023-10381-9
  9. S.V. Yadav, M.V. Yadav, V. Singh, K.P. Bhati, D. Yadav, T. Ali, B.S. Supreetha Miniaturized UWB antenna design for 5G and space-based microwave applications. Results in Engineering, 27, (2025) 105592. https://doi.org/10.1016/j.rineng.2025.105592
  10. A. Yadav, P. Singh, R.K. Verma, V.K. Singh, Design and comparative analysis of circuit theory model‐based slot‐loaded printed rectangular monopole antenna for UWB applications with notch band. International Journal of Communication Systems, 36(3), (2023) e5390. https://doi.org/10.1002/dac.5390
  11. Q. Zou, Z. Gu, R. Xie, Z. Zhang, H. Zhang, J. Ding, High‐gain UWB double slot vivaldi antenna loaded with metasurface and semi‐elliptical slots. Microwave and Optical Technology Letters, 65(8), (2023) 2412-2417. https://doi.org/10.1002/mop.33713
  12. M. Firoz Ahmed, M. Hasnat Kabir, Abu Zafor Md. Touhidul Islam, (2021) Design of Rectangular Patch Microstrip Antenna with Bandwidth and Gain Enhancement for UWB Applications. International Conference on Computer, Communication, Chemical, Materials and Electronic Engineering (IC4ME2), IEEE, Bangladesh. https://doi.org/10.1109/IC4ME253898.2021.9768576
  13. S.V. Yadav, M.V. Yadav, R. Gupta, D. Yadav, K.P. Bhati, T. Ali, V. Singh, Design and Analysis of a Slotted Planar Antenna with Parasitic Ring Patch for Efficient 5G Microwave Applications. Telecommunications and Radio Engineering, 84(1), (2025) 71-82. https://doi.org/10.1615/TelecomRadEng.2024050294
  14. R.K. Garg, S. Choudhury, R.S. Tomar, Hexagonal ring‐inspired antenna for UWB and V2X applications. Microwave and Optical Technology Letters, 66(3), (2024) e34087. https://doi.org/10.1002/mop.34087
  15. S.H. Kiani, X.C. Ren, M.R. Anjum, K. Mahmood, H. Ali, N. Jan, M.A. Bashir, M.A. Khan, A Novel Shape Compact Antenna for Ultrawideband Applications. International Journal of Antennas and Propagation, 2021(1), (2021) 7004799. https://doi.org/10.1155/2021/7004799
  16. S.V. Yadav, M.V. Yadav, D. Yadav, Development of a Compact Planar Antenna with Multi-Resonant Geometry for Broadband CubeSat Applications. Progress in Electromagnetics Research C, 157, (2025) 215.
  17. M. Hussain, M.A. Sufian, M.S. Alzaidi, S.I. Naqvi, N. Hussain, D.H. Elkamchouchi, M.F.A. Sree, S.Y.A. Fatah, Bandwidth and gain enhancement of a CPW antenna using frequency selective surface for UWB applications. Micromachines, 14(3), (2023) 591. https://doi.org/10.3390/mi14030591
  18. V.K. Singh, N. Bangari, Z. Ali, A. Vyas, R.K. Verma, A. Saxena, Parachute shape ultra-wideband wearable antenna for remote health care monitoring. International Journal of Communication Systems, 36(10), (2023) e5488. https://doi.org/10.1002/dac.5488
  19. P. Ghandade, P. Siddharth, A. Chauhan, H. Mhatre, A. Chaudhari, (2020) Compact UWB MIMO Antenna with Band-Notch Characteristics. 3rd IEEE International Conference on Communication System, Computing and IT Applications (CSCITA), IEEE, India. https://doi.org/10.1109/CSCITA47329.2020.9137800
  20. M. Hussain, S.M. Abbas, Y. Zhu, (2025). Multi–stub loaded tri-band flexible antenna based on PDMS for heterogeneous applications. In 2025 URSI Asia-Pacific Radio Science Meeting (AP-RASC), Australia.
  21. M. Hussain, W.A. Awan, S.M. Abbas, Y. Zhu, Compact Bendable Multiwalled Carbon Nanotube/PDMS Antenna for WLAN and Wi‐Fi 6E Wearables in 5G/6G Networks. Advanced Engineering Materials, 27(23), (2025) e202502127. https://doi.org/10.1002/adem.202502127
  22. M. Hussain, U. Rafique, H. Zahra, S.M. Abbas, Y. Zhu, (2024) A compact PDMS based ultra wideband antenna for wireless body area networks. In 2024 IEEE international symposium on antennas and propagation and INC/USNC‐URSI radio science meeting (AP-S/INC-USNC-URSI), IEEE, Italy. https://doi.org/10.1109/AP-S/INC-USNC-URSI52054.2024.10687092
  23. M. Hussain, W.A. Awan, A.Y. Jaffar, A. Awabli, A pin diode-enabled compact size antenna for transition between UWB and notched UWB modes. Arabian journal for science and engineering, 50, (2025) 17759-17768. https://doi.org/10.1007/s13369-025-10105-0
  24. M. Hussain, W.A. Abbas, W. Awan, S.L. Naqvi, Miniaturized arrow-shaped flexible filter-embedded antenna for industrial and medical applications. Applied Science, 14(23), (2024) 11004. https://doi.org/10.3390/app142311004
  25. M. Hussain, U. Rafique, H. Zahra, S.M. Abbas, S. Mukhopadhyay, (2023) A compact and geometrically simple CPW fed antenna for 2.4/5.4 GHz ISM and WLAN applications. IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI), IEEE, USA. https://doi.org/10.1109/USNC-URSI52151.2023.10237850
  26. K. Kaur, A. Kumar, N. Sharma, Sprocket gear wheel shaped printed monopole ultra‐wideband antenna with band notch characteristics: Design and measurement. International Journal of RF and Microwave Computer‐Aided Engineering, 32(3), (2022) e22989. https://doi.org/10.1002/mmce.22989
  27. S.V. Yadav, M.V. Yadav, D. Yadav, G.K. Soni, Multi-band high-frequency antenna for satellite, automotive radar, and 6G communication. Scientific Reports, 15(1), (2025) 30400. https://doi.org/10.1038/s41598-025-16217-9
  28. T. Gayatri, G. Srinivasu, D.M.K. Chaitanya, V.K. Sharma, A compact Luna shaped high gain UWB antenna in 3.1 GHz to 10.6 GHz using FR4 material substrate. Materials Today: Proceedings, Elsevier Ltd, (2021) 359–365. https://doi.org/10.1016/j.matpr.2021.02.163
  29. A.H. Mohammadian, A. Rajkotia, S.S. Soliman, Characterization of UWB Transmit-Receive Antenna System. IEEE Conference on Ultra Wideband Systems and Technologies, (2003)157-161. https://doi.org/10.1109/UWBST.2003.1267823
  30. D.M. Pozar, (2011) Microwave Engineering, 4th ed. Hoboken, Wiley. USA.
  31. C.A. Balanis, (2016) Antenna Theory: Analysis and Design, 4th ed. Hoboken, Wiley, USA.
  32. S.K.K. Dash, Q.S. Cheng, T. Khan, M.V. Yadav, L. Wang, 5G millimeter-wave MIMO DRAs with reduced mutual coupling. Microwave and Optical Technology Letters, v66(1), (2024) e33982. https://doi.org/10.1002/mop.33982
  33. S.V. Yadav, M.V. Yadav, T. Ali, S.K.K. Dash, N.T. Hegde, V.G. Nair, A circular compact ultra‐wideband antenna for 5G microwave applications. TELKOMNIKA (Telecommunication Computing Electronics and Control), 22(3), (2024) 556-566. http://doi.org/10.12928/telkomnika.v22i3.25852
  34. J.S. Hong, B.M. Karyamapudi, A general circuit model for defected ground structures in planar transmission lines. IEEE microwave and wireless components letters, 15(10), (2005) 706-708. https://doi.org/10.1109/LMWC.2005.856832
  35. T. Sarkar, A. Ghosh, L.L. Singh, S. Chattopadhyay, DGS Integrated Air Loaded Wideband Microstrip Antenna for X and Ku Band. IEEE Antennas and Wireless Propagation Letters, 19(1), (2019) 114 – 118. https://doi.org/10.1109/LAWP.2019.2955111
  36. H.M. Lee, W.S. Chol, Effect of Partial Ground Plane Removal on the Radiation Characteristics of a Microstrip Antenna. Wireless Engineering and Technology, 4(1), (2013) 5-12. http://dx.doi.org/10.4236/wet.2013.41002