On the Effect of Fractal Electromagnetic Band Gap on Antenna Performance

Abstract

This paper presents the design of electromagnetic band gap (EBG) structure using fractals geometry and its effect on antenna performance. The EBG structure has been designed on substrate ε_r=4.3 and thickness h=1.53 mm. The 1st iterative EBG structure offers the surface wave suppression around 20 dB down from 2.94 to 4.58 GHz corresponds to 43.62% bandwidth. The experimental results of 2nd iterative EBG structure revealed the surface wave suppression in two bands from 2.45 to 3.36 GHz and from 8.52 to 11.02 GHz. The surface wave suppression bandwidth for both the bands is 31.325 and 25.59%, respectively. The antenna designed with the proposed EBG in same plane exhibits improvement in the bandwidth by 20.5%, gain by 2.44 dB and reduction in back lobe in comparison to antenna without EBG.

Keywords:

• Electromagnetic band gap
• Fractal geometry
• Microstrip antenna
• Resonant frequency
• Surface wave suppression

Additional information

Notes on contributors

Raj Kumar

Raj Kumar was born on 14th May 1963 in Muzaffarnagar U.P., India. He has completed his M.Sc. Degree specialized in Electronics in 1987 from University of Meerut, Meerut. He has been awarded M. Tech. and Ph. D degree in Microwave in 1992 and 1997 respectively from University of Delhi South Campus, New Delhi. He worked at CEERI Pilani from 1993 to 1994 as a research associate. From May 1997 to June 1998, he worked as Assistant Professor in Department of Electronics and Communications Engg, Vellore College of Engg. (Now VIT), Vellore. He worked in DLRL (DRDO), Hyderabad as Scientist from June 1998 to August 2002 and later on came in DIAT in Sept 2002. At present, he is Scientist ‘E’ in Department of Electronics Engg., DIAT (Deemed University), Pune. He established a Microwave and Millimeter Wave Antenna Laboratory in DIAT(DU), Pune and formulated the M. Tech. Programme in the Department of Electronics Engg. in 2010. He has written several technical paper in reputed International Journal and conferences. His field of interest is Electromagnetic Analysis, Design of filters, Multiplexers, Power dividers, Couplers, Miniaturization of Antenna, Multiband Antenna and Ultra wideband Antennas, and Electromagnetic band-Gap. E-mail: [email protected]

Jayashree P. Shinde

Jayashree P. Shinde was born on 22nd October 1976 Sangali, Maharashtra, India. She received B. E. degree in Electronics Engineering from P.V.P.I.T, Shivaji University in April 1997. She was rewarded a Master of Engineering degree in Electronics and Telecommunication with specialization in Microwaves from Government College of Engineering, University of Pune, Pune in November 1999. Presently, she is working as Assistant Professor in the Department of Electronics and Telecommunication, Sinhgad Academy of Engineering, Pune, since 2001. She has published 08 papers in International Journal and conferences. Currently, she is pursuing her Ph.D. degree in the Department of Electronics, Shivaji University, India. Her research field of interest includes Microwave Antenna, Wireless Communication, Study of Electromagnetic band gap and Environmental effects on LOS communication. E-mail: [email protected]