volume | PIER Journals

Abstract

A broadband monopole antenna is presented, with a radiating body consisting of a fractal tree with three-dimensional conical branches. The effect on polarization and return loss of varying the number of branches, as well as the number of fractal iterations, is explored and presented. The best-case antenna, having five branches and three fractal iterations, was fabricated using a 3D-printed form covered in conductive spray paint. The return loss of this antenna was shown in both simulation and measurement to be better than -10 dB from 1.22 GHz to 24.1 GHz, a bandwidth of more than 180%.

1. Bandelbrot, B. B., The Fractal Geometry of Nature, Macmillan, 1983.

2. Puente-Baliarda, C., J. Romeu, R. Pous, and A. Cardama, "On the behavior of the Sierpinski multiband fractal antenna," IEEE Trans. Antennas Propag., Vol. 46, No. 4, 517-524, 1998.
doi:10.1109/8.664115

3. Naser-Moghadasi, M., R. A. Sadeghzadeh, T. Aribi, T. Sedghi, and B. S. Virdee, "UWB monopole microstrip antenna using fractal tree unit-cells," Microw. Opt. Technol. Lett., Vol. 54, No. 10, 2366-2370, 2012.
doi:10.1002/mop.27081

4. Pourahmadazar, J., C. Ghobadi, and J. Nourinia, "Novel modified pythagorean tree fractal monopole antennas for UWB applications," IEEE Antennas Wirel. Propag. Lett., Vol. 10, 484-487, 2011.
doi:10.1109/LAWP.2011.2154354

5. Mahatthanajatuphat, C., P. Akkaraekthalin, S. Saleekaw, and M. Krairiksh, "Bidirectional multiband antenna with modified fractal slot fed by CPW," Progress In Electromagnetics Research, Vol. 95, 59-72, 2009.
doi:10.2528/PIER09061603

6. Mahatthanajatuphat, C., S. Saleekaw, P. Akkaraekthalin, and M. Krairiksh, "A Rhombic patch monopole antenna with modified Minkowski fractal geometry for UMTS, WLAN, and mobile WiMAX application," Progress In Electromagnetics Research, Vol. 89, 57-74, 2009.
doi:10.2528/PIER08111907

7. Hamdy, S., A. El-Khouly, A. Zaki, and S. E. El-Khamy, "A new fractal-like tree structure of circular patch antennas for 5G multi-band and wide-band applications," 2016 Progress In Electromagnetics Research Symposium (PIERS), 2467-2467, Shanghai, China, August 8-11, 2016.

8. Petko, J. S. and D. H. Werner, "Miniature reconfigurable three-dimensional fractal tree antennas," IEEE Trans. Antennas Propag., Vol. 52, No. 8, 1945-1956, 2004.
doi:10.1109/TAP.2004.832491

9. Rmili, H., O. El Mrabet, J. Floc’h, and J. Miane, "Study of an electrochemically-deposited 3-D random fractal tree-monopole antenna," IEEE Trans. Antennas Propag., Vol. 55, No. 4, 1045-1050, 2007.
doi:10.1109/TAP.2007.893392

10. Smith, K. L. and R. S. Adams, "A novel ultra-wideband fractal monopole antenna," IEEE Int. Symp. on Ant. and Prop. (APSURSI), 2315-2316, 2015.

Dr. Kathryn Smith

Dr. Ryan S. Adams