A dual-band flexible antenna incorporated with the fractal structure using coplanar waveguide (CPW) is proposed for 2.42 GHz WLAN and 3.78 GHz WiMAX applications. The antenna is printed on a low-cost FR4 substrate having a thickness of 0.5 mm with overall antenna dimension of 97.48x80 mm2. Incorporation of fractal geometry leads to improvement in terms of impedance bandwidth and radiation efficiency. The simulated and measured results of the proposed antenna in terms of return loss (S11), gain, radiation pattern, and VSWR are presented here which show great correlation. The measured impedance bandwidth and gain of the flexible antenna are 17.08% (2.20 GHz-2.61 GHz), 16.30% (3.38 GHz-3.98 GHz), 4.56 dBi and 1.09 dBi, respectively. The proposed dual-band antenna shows omnidirectional and bidirectional radiation patterns in H and E-planes which makes it suitable for its use in low-cost Bluetooth/WLAN/WPAN/WiMAX applications.
2. Chakraborty, U., S. Chatterjee, S. K. Chowdhury, and P. P. Sarkar, "A compact microstrip patch antenna for wireless communication," Progress In Electromagnetics Research C, Vol. 18, 211-220, 2011.
doi:10.2528/PIERC10101205
3. Ahmed, S., F. A. Tahir, and H. M. Cheema, "A flexible low cost fractal-slot multiband antenna for wireless applications," 9th European Conference on Antennas and Propagation (EuCAP), 1-4, Lisbon, 2015.
4. Cheong, W. H., J. H. Song, and J. J. Kim, "Wearable, wireless gas sensors using highly stretchable and transparent structures of nanowires and graphene," Nanoscale, Vol. 8, No. 20, 10591-10597, 2016.
doi:10.1039/C6NR01468B
5. Liu, X., et al., "A highly sensitive graphene woven fabric strain sensor for wearable wireless musical instruments," Materials Horizons, Vol. 4, No. 3, 477-486, 2017.
doi:10.1039/C7MH00104E
6. Bhatt, S., P. Mankodi, A. Desai, and R. Patel, "Analysis of ultra-wideband fractal antenna designs and their applications for wireless communication: A survey," 2017 International Conference on Inventive Systems and Control (ICISC), 2017.
7. Desai, A., T. K. Upadhyaya, R. H. Patel, S. Bhatt, and P. Mankodi, "Wideband high gain fractal antenna for wireless applications," Progress In Electromagnetics Research Letters, Vol. 74, 125-130, 2018.
doi:10.2528/PIERL18011504
8. Bayatmaku, N., P. Lotfi, M. Azarmanesh, and S. Soltani, "Design of simple multiband patch antenna for mobile communication applications using new E-shape fractal," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 873-875, 2011.
doi:10.1109/LAWP.2011.2165195
9. Lizzi, L. and A. Massa, "Dual-band printed fractal monopole antenna for LTE applications," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 760-763, 2011.
doi:10.1109/LAWP.2011.2163051
10. Krishna, D. D., M. Gopikrishna, C. K. Anandan, P. Mohanan, and K. Vasudevan, "CPW-fed Koch fractal slot antenna for WLAN/WiMAX applications," IEEE Antennas and Wireless Propagation Letters, Vol. 7, 389-392, 2008.
doi:10.1109/LAWP.2008.2000814
11. Desai, A., T. Upadhyaya, M. Palandoken, R. Patel, and U. Patel, "Dual band optically transparent antenna for wireless applications," IEEE Asia Pacific Microwave Conference, Kuala Lumpur, Malaysia, Nov. 13-16, 2017.
12. Desai, A., T. Upadhyaya, and M. Palandoken, "Dual band slotted transparent resonator for wireless local area network applications," Microw. Opt. Technol. Lett., 1-6, 2018.
13. Desai, A. and T. Upadhyaya, "Transparent dual band antenna with μ-negative material loading for smart devices," Microw. Opt. Technol. Lett., 1-7, 2018.
14. Patel, R. H., A. Desai, and T. K. Upadhyaya, "Discussion on electrically small antenna property," Microw. Opt. Technol. Lett., Vol. 57, 2386-2388, 2015, doi: 10.1002/mop.29335.
doi:10.1002/mop.29335
15. Khaleel, H. R., H. M. Al-Rizzo, and A. I. Abbosh, "Design, fabrication, and testing of flexible antennas," Advancement in Microstrip Antennas with Recent Applications, A. Kishk (ed.), InTech, Vienna, Austria, 2013.
16. Jose Miguel Mesquit, A., Y. Nuno Pires, and A. A. Moreira, "Influence of deformations on the matching of a flexible dual-band antenna," 7th Europeans Conference on Antennas and Propagation, IEEE, 2013.
17. Amal, A., B. Larbi, A. Anouar, R. Fatima, and E. Abdelhamid, "Miniaturized wideband flexible CPW antenna with hexagonal ring slots for early breast cancer detection," Advances in Ubiquitous Networking. Lecture Notes in Electrical Engineering, E. Sabir, H. Medromi, and M. Sadik (eds.), Vol. 366, Springer, Singapore, 2016.
18. Sallam, M. O., S. M. Kandil, V. Volski, G. A. E. Vandenbosch, and E. A. Soliman, "Wideband CPW-fed flexible bow-tie slot antenna for WLAN/WiMAX systems," IEEE Transactions on Antennas and Propagation, Vol. 65, No. 8, 4274-4277, Aug. 2017.
doi:10.1109/TAP.2017.2710227
19. Tsai, L.-C., "A triple-band bow-tie-shaped CPW-fed slot antenna for WLAN applications," Progress In Electromagnetics Research C, Vol. 47, 167-171, 2014.
20. Yoon, H. K., W. S. Kang, Y. J. Yoon, and C.-H. Lee, "A CPW-fed flexible monopole antenna for UWB systems," 2007 IEEE Antennas and Propagation Society International Symposium, 701-704, Honolulu, HI, 2007.
21. Liu, H., S. Zhu, P.Wen, X. Xiao, W. Che, and X. Guan, "Flexible CPW-fed fishtail-shaped antenna for dual-band applications," for dual-band applications, Vol. 13, 2014.
22. Yang, X., Q. Feng, and Z. Zheng, "First-order minkowski fractal circularly polarized slot loop antenna with simple feeding network for UHF RFID reader," Progress In Electromagnetics Research Letters, Vol. 77, 89-96, 2018.
doi:10.2528/PIERL18052501
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