volume | PIER Journals

Abstract

This work presents a compact coplanar waveguide (CPW) fed super wideband (SWB) antenna realized on a low-cost FR4 substrate (ε_r = 4.4, thickness = 1.6 mm). The 20 × 20 mm² radiator integrates a multi-slotted patch within a hexagonal ground plane aperture and a carefully optimized tuning stub that excites and merges multiple resonances into a continuous broadband response. The antenna achieves a measured |S₁₁| ≤ -10 dB impedance bandwidth from 2 to 34 GHz (177.7%), encompassing sub-6 GHz 5G, WLAN/WiMAX, and millimeter wave (Ku/Ka) allocations. Radiation measurements reveal quasi-omnidirectional patterns with a peak gain of 6.60 dB and maximum radiation efficiency of 82.68%. Time-domain analysis demonstrates an almost constant group delay (approximately 0.1 to 0.5 ns, mean 0.19 ns) with a single localized deviation near 24.4 GHz, confirming low dispersion and excellent phase linearity, which are desirable for IR-UWB and high data rate communication systems. Parametric optimization and equivalent RLC circuit modeling validate the broadband mechanism, while simulation studies performed using CST Microwave Studio exhibit excellent agreement with experimental results. The proposed design therefore offers a cost-effective, compact, and high-performance antenna solution suitable for 5G/6G front ends, radar imaging, and broadband sensing applications.

1. Awan, Dawar, Shahid Bashir, Shahid Khan, Samir Salem Al-Bawri, and Mariana Dalarsson, "UWB antenna with enhanced directivity for applications in microwave medical imaging," Sensors, Vol. 24, No. 4, 1315, 2024.
doi:10.3390/s24041315 Google Scholar

2. Jalilvand, Malyhe, Xuyang Li, Lukasz Zwirello, and Thomas Zwick, "Ultra wideband compact near‐field imaging system for breast cancer detection," IET Microwaves, Antennas & Propagation, Vol. 9, No. 10, 1009-1014, 2015.
doi:10.1049/iet-map.2014.0735 Google Scholar

3. Sekhar, Manepalli and Nelaturi Suman, "CPW fed super-wideband antenna for microwave imaging application," Progress In Electromagnetics Research C, Vol. 130, 201-212, 2023.
doi:10.2528/PIERC22122707 Google Scholar

4. AlSawaftah, Nour, Salma El-Abed, Salam Dhou, and Amer Zakaria, "Microwave imaging for early breast cancer detection: Current state, challenges, and future directions," Journal of Imaging, Vol. 8, No. 5, 123, 2022.
doi:10.3390/jimaging8050123 Google Scholar

5. Gharaati, Alireza, Mohammad Saeid Ghaffarian, Hossein Saghlatoon, Mahdi Behdani, and Rashid Mirzavand, "A low-profile wideband circularly polarized CPW slot antenna," AEU --- International Journal of Electronics and Communications, Vol. 129, 153534, 2021.
doi:10.1016/j.aeue.2020.153534 Google Scholar

6. Dey, Shuvashis, Md. Shamsul Arefin, and Nemai Chandra Karmakar, "Design and experimental analysis of a novel compact and flexible super wide band antenna for 5G," IEEE Access, Vol. 9, 46698-46708, 2021.
doi:10.1109/access.2021.3068082 Google Scholar

7. Dhara, R., "Quad-band circularly polarized CPW-fed G-shaped printed antenna with square slot," Radioelectronics and Communications Systems, Vol. 63, No. 7, 376-385, 2020.
doi:10.3103/s0735272720070055 Google Scholar

8. Ahmad, Sarosh, Umer Ijaz, Salman Naseer, Adnan Ghaffar, Muhammad Awais Qasim, Faisal Abrar, Naser Ojaroudi Parchin, Chan Hwang See, and Raed Abd-Alhameed, "A jug-shaped CPW-fed ultra-wideband printed monopole antenna for wireless communications networks," Applied Sciences, Vol. 12, No. 2, 821, 2022.
doi:10.3390/app12020821 Google Scholar

9. Jameel, Maryam S., Yaqeen S. Mezaal, and Dogu Cagdas Atilla, "Miniaturized coplanar waveguide-fed UWB antenna for wireless applications," Symmetry, Vol. 15, No. 3, 633, 2023.
doi:10.3390/sym15030633 Google Scholar

10. Hossain, Amran, Mohammad Tariqul Islam, Md. Tarikul Islam, Muhammad E. H. Chowdhury, Hatem Rmili, and Md. Samsuzzaman, "A planar ultrawideband patch antenna array for microwave breast tumor detection," Materials, Vol. 13, No. 21, 4918, 2020.
doi:10.3390/ma13214918 Google Scholar

11. Islam, Md. Tarikul, Mohammad Tariqul Islam, Md. Samsuzzaman, Haslina Arshad, and Hatem Rmili, "Metamaterial loaded nine high gain vivaldi antennas array for microwave breast imaging application," IEEE Access, Vol. 8, 227678-227689, 2020.
doi:10.1109/access.2020.3045458 Google Scholar

12. Dhara, Reshmi, "Design of a miniaturized CPW fed Z-shaped monopole antenna using theory of characteristics modes for bandwidth enhancement," Sādhanā, Vol. 46, No. 2, 87, 2021.
doi:10.1007/s12046-021-01610-7 Google Scholar

13. Wheeler, H. A., "Transmission-line properties of parallel strips separated by a dielectric sheet," IEEE Transactions on Microwave Theory and Techniques, Vol. 13, No. 2, 172-185, 1965.
doi:10.1109/tmtt.1965.1125962 Google Scholar

14. Fu, Qiang, Quanyuan Feng, and Hua Chen, "Design and optimization of CPW-fed broadband circularly polarized antenna for multiple communication systems," Progress In Electromagnetics Research Letters, Vol. 99, 65-74, 2021.
doi:10.2528/pierl21062205 Google Scholar

15. Elhabchi, Mourad, Mohamed Nabil Srifi, and Raja Touahni, "A novel modified U-shaped microstrip antenna for super wide band (SWB) applications," Analog Integrated Circuits and Signal Processing, Vol. 102, No. 3, 571-578, 2020.
doi:10.1007/s10470-020-01589-x Google Scholar

16. Kaur, Kavneet, Ashwani Kumar, and Narinder Sharma, "A novel design of ultra-wideband CPW-fed printed monopole antenna for Wi-MAX, WLAN and X-band rejection characteristics," Analog Integrated Circuits and Signal Processing, Vol. 114, No. 1, 143-157, 2023.
doi:10.1007/s10470-022-02132-w Google Scholar

17. Mali, Ravi, Deepshikha Lodhi, and Sarthak Singhal, "Quad broadband circularly polarized CPW FED cleaver shaped extended UWB MIMO antenna for 5G, C, K and millimeter wave applications," Analog Integrated Circuits and Signal Processing, Vol. 118, No. 2, 271-290, 2024.
doi:10.1007/s10470-023-02202-7 Google Scholar

18. Islam, Mohammad Shahidul, Mohammad Tariqul Islam, and Ali F. Almutairi, "A portable non-invasive microwave based head imaging system using compact metamaterial loaded 3D unidirectional antenna for stroke detection," Scientific Reports, Vol. 12, No. 1, 8895, 2022.
doi:10.1038/s41598-022-12860-8 Google Scholar

19. Hossain, Amran, Mohammad Tariqul Islam, Ali F. Almutairi, Mandeep Singh Jit Singh, Kamarulzaman Mat, and Md. Samsuzzaman, "An octagonal ring-shaped parasitic resonator based compact ultrawideband antenna for microwave imaging applications," Sensors, Vol. 20, No. 5, 1354, 2020.
doi:10.3390/s20051354 Google Scholar

20. Srivastava, Gunjan, Akhilesh Mohan, and Ajay Chakrabarty, "Compact reconfigurable UWB slot antenna for cognitive radio applications," IEEE Antennas and Wireless Propagation Letters, Vol. 16, 1139-1142, 2016.
doi:10.1109/lawp.2016.2624736 Google Scholar

21. Yadav, Sachin Kumar, Amanpreet Kaur, and Rajesh Khanna, "Cylindrical air spaced high gain dielectric resonator antenna for ultra-wideband applications," Sādhanā, Vol. 45, No. 1, 163, 2020.
doi:10.1007/s12046-020-01409-y Google Scholar

22. Deshmukh, Amit A. and K. P. Ray, "Analysis and design of broadband U-slot cut rectangular microstrip antennas," Sādhanā, Vol. 42, No. 10, 1671-1684, 2017.
doi:10.1007/s12046-017-0699-4 Google Scholar

23. Deshmukh, Amit A., Divya Singh, and K. P. Ray, "Modified designs of broadband E-shape microstrip antennas," Sādhanā, Vol. 44, No. 3, 64, 2019.
doi:10.1007/s12046-018-1030-8 Google Scholar

24. Kwe, Ngum Breayon, Vishal Yadav, Manish Kumar, Serguei V. Savilov, M. Z. A. Yahya, and Sandeep Kumar Singh, "A comparative study of dielectric substrate materials effects on the performance of microstrip patch antenna for 5G/6G application," Journal of Materials Science: Materials in Electronics, Vol. 35, No. 24, 1617, 2024.
doi:10.1007/s10854-024-13380-z Google Scholar

25. Zhang, Sheng, Ye Zhong, Yuyu Zhou, Ya Guo, and Chao Ji, "Design of a symmetric open slot antenna for UWB applications," IEICE Electronics Express, Vol. 16, No. 20, 20190533, 2019.
doi:10.1587/elex.16.20190533 Google Scholar

26. Negi, Deepa and Rajesh Khanna, "A high gain CPW fed metamaterial antenna for UWB applications," Progress In Electromagnetics Research C, Vol. 132, 51-63, 2023.
doi:10.2528/pierc22122301 Google Scholar

27. Chaudhary, Abhishek Kumar and Murli Manohar, "A modified SWB hexagonal fractal spatial diversity antenna with high isolation using meander line approach," IEEE Access, Vol. 10, 10238-10250, 2022.
doi:10.1109/access.2022.3144850 Google Scholar

28. Balanis, Constantine A., Antenna Theory: Analysis and Design, John Wiley & Sons, 2016.

29. Kumar, Sachin, Kang Wook Kim, Hyun Chul Choi, Shobhit Saxena, Rahul Tiwari, Mukesh K. Khandelwal, Sandeep Kumar Palaniswamy, and B. K. Kanaujia, "A low profile circularly polarized UWB antenna with integrated GSM band for wireless communication," AEU --- International Journal of Electronics and Communications, Vol. 93, 224-232, 2018.
doi:10.1016/j.aeue.2018.06.027 Google Scholar

30. Tiwari, Rakesh N., Prabhakar Singh, and Binod Kumar Kanaujia, "A modified microstrip line fed compact UWB antenna for WiMAX/ISM/WLAN and wireless communications," AEU --- International Journal of Electronics and Communications, Vol. 104, 58-65, 2019.
doi:10.1016/j.aeue.2019.03.008 Google Scholar

31. Sharma, Vijay, Gunaram, J. K. Deegwal, and Dhirendra Mathur, "Super-wideband compact offset elliptical ring patch antenna for 5G applications," Wireless Personal Communications, Vol. 122, No. 2, 1655-1670, 2022.
doi:10.1007/s11277-021-08965-4 Google Scholar

Dr. Manish Kumar

Dr. Sandeep Kumar Singh

Dr. Madhukar Deshmukh

Dr. Siti Nor Farhana Yusuf