A new compact broadband circular fractal antenna is presented to simultaneously cover the operations in S-, C-, X-, and Ku-bands. Fractal geometry of the radiator including an iterative circular patch with a square slot, a modified feed-line with step technique, and slot-loaded semi-circular ground plane is used to achieve a broad impedance bandwidth more than 151% from 3 to 21.5 GHz (|S11|< -10 dB). The simulation results are verified by experimental measurements. Measured data are in good agreement with the simulated results. The frequency- and time-domain characteristics of the antenna including impedance matching, far-field patterns, gain, group delay, and fidelity factor are presented and discussed. The proposed broadband antenna features small size of 38×36×1.4 mm3 and nearly omnidirectional radiation patterns that make it excellent candidate for integration in broadband wireless communication systems.
"A New Compact Circular Shape Fractal Antenna for Broadband Wireless Communication Applications," Progress In Electromagnetics Research C,
Vol. 93, 19-28, 2019. doi:10.2528/PIERC19031001
1. Li, D. and J.-F. Mao, "Sierpinskized Koch-like sided multifractal dipole antenna," Progress In Electromagnetics Research, Vol. 130, 207-224, 2012. doi:10.2528/PIER12060108
2. Mandelbrot, The Fractal Geometry of Nature, W. H. Freeman, New York, 1983.
3. Kharat, K., S. Dhoot, and J. Vajpai, "Design of compact multiband fractal antenna for WLAN and WiMAX applications," IEEE International Conference on Pervasive Computing (ICPC), 2015.
4. Werner, D. H. and S. Ganguly, "An overview of Fractal antenna engineering research," IEEE Antennas and Propagation Magazine, Vol. 45, 38-57, 2003. doi:10.1109/MAP.2003.1189650
5. Gianvittorio, J. and Y. Rahmat-Samii, "Fractal element antennas: A compilation of configurations with novel characteristics," IEEE Antennas and Propagation Society International Symposium, Salt Lake City, UT, USA, July 16–21, 2000.
6. Moghadasi, M. N., R. A. Sadeghzadeh, T. Aribi, T. Sedghi, and B. S. Virdee, "UWB monopole microstrip antenna using fractal tree unit-cells," Microwave and Optical Technology Letters, Vol. 54, No. 10, 2366-2370, 2012. doi:10.1002/mop.27081
7. Singhal, S., P. Singh, and A. K. Singh, "Asymmetrically CPW-FED octagonal Sierpinski UWB fractal antenna," Microwave and Optical Technology Letter, Vol. 58, No. 7, July 2016.
8. Li, D. and J.-F. Mao, "A Koch-like sided fractal bow-tie dipole antenna," IEEE Trans. Antennas Propag., Vol. 60, No. 5, 2242-2251, 2012. doi:10.1109/TAP.2012.2189719
9. Zhong, Y.-W., G.-M. Yang, and L.-R. Zhong, "Gain enhancement of bow-tie antenna using fractal wideband artificial magnetic conductor ground," Electron. Lett., Vol. 51, No. 4, 315-317, 2015. doi:10.1049/el.2014.4017
10. Kumar Terlapu, S., Ch. Jaya, and G. S. Raju, "On the notch band characteristics of Koch fractal antenna for UWB applications," International Journal of Control Theory and Applications, Vol. 10, No. 6, 0974-5572, 2017.
11. Dorostkar, M. A., M. T. Islam, and R. Azim, "Design of a novel super wide band circular-hexagonal fractal antenna," Progress In Electromagnetics Research, Vol. 139, 229-245, 2013. doi:10.2528/PIER13030505
12. Shahu, B. L., S. Pal, and N. Chattoraj, "Design of super wideband hexagonal-shaped fractal antenna with triangular slot," Microwave and Optical Technology Letters, Vol. 57, No. 7, 1659-1662, July 2015. doi:10.1002/mop.29184
13. Waladi, V., N. Mohammadi, Y. Zehforoosh, A. Habashi, and J. Nourinia, "A novel Modified Star-Triangular Fractal (MSTF) monopole antenna for super-wideband applications," IEEE Antennas and Wireless Propagation Letters, Vol. 12, 651-654, 2013. doi:10.1109/LAWP.2013.2262571
14. Tanweer, A., B. K. Subhash, and C. B. Rajashekhar, "A miniaturized decagonal Sierpinski UWB fractal antenna," Progress In Electromagnetics Research C, Vol. 84, 161-174, 2018.
15. Tizyi, H., F. Riouch, A. Tribak, A. Najid, and A. Mediavilla, "CPW and microstrip line-fed compact fractal antenna for UWB-RFID applications," Progress In Electromagnetics Research C, Vol. 65, 201-209, 2016. doi:10.2528/PIERC16041110
16. Khan, O. M., Z. U. Islam, I. Rashid, F. A. Bhatti, and Q. U. Islam, "Novel miniaturized Koch pentagonal fractal antenna for multiband wireless applications," Progress In Electromagnetics Research, Vol. 141, 693-710, 2013. doi:10.2528/PIER13060904
17. Aggarwal, A. and M. V. Kartikeyan, "Pythagoras tree: A fractal patch antenna for multi-frequency and ultra-wide bandwidth operations," Progress Electromagnetics Research C, Vol. 16, 25-35, 2010. doi:10.2528/PIERC10062206
18. Mahmoud, A. M. M. K. R. and H. A. Elmikati, "Design of hexa-band planar inverted-F antenna using hybrid BSO-NM algorithm for mobile phone communications," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 23, No. 1, 2013. doi:10.1002/mmce.20656
19. Lizzi, L., R. Azaro, G. Oliveri, and A. Massa, "Multiband fractal antenna for wireless communication systems for emergency management," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 1, 1-11, 2012. doi:10.1163/156939312798954865
20. Balanis, C. A., Antenna Theory: Analysis and Design, 3rd Ed., Wiley, 2005.
21. Wu, Q., R. Jin, J. Geng, and M. Ding, "Pulse preserving capabilities of printed circular disk monopole antennas with different grounds for the specified input signal forms," IEEE Trans. Antennas Propag., Vol. 55, No. 10, 2866-2873, Oct. 2007. doi:10.1109/TAP.2007.905854