Present wireless communication demands compact and intelligent devices with multitasking capabilities at affordable cost. The focus in the presented paper is on a dual band antenna for wireless communication with the capability of operating at two frequency bands with same structure. Two resonance frequencies are observed with the second operation band at 4.2GHz approximately three times the first resonance frequency at 1.5GHz. Structure is simple loop of microstrip line with characteristic impedance 50 ohms. The proposed antenna is designed using defective ground structure (DGS) and shows the nearly one third reductions in size as compared to without DGS. This antenna was simulated on electromagnetic (EM) simulation software and fabricated using microwave integrated circuit technique on RT-Duroid dielectric substrate (εr= 2.22) of thickness (H=15 mils). The designed antenna was tested on automatic network analyzer and shows the good agreement with simulated results. The proposed structure is modeled into an equivalent electrical circuit and simulated on circuit simulator. Subsequently, theoretical analysis was carried out and simulated. The simulated, measured, equivalent circuit response, and theoretical results shows good resemblance. The bands of operation draw many potential applications in today’s wireless communication.
 R. Kronberger, H. Lindenmcier, L. Reiter, and J. Hapf, “Multi band planar Invencd-F car antenna for mobile phone and GPS,” IEEE Antennas and Propagation Society International Symposium, 1999. vol.4, pp.2714 – 2717.
 Z. D. Liu, P. S. Hall and D. Wake “Dual frequency planar circularly polarized antenna at S and L-bands,” 10th International Conference on Antennas and Propagation, 14-17 April 1997, pp. 378 - 380.
 Bjom Lindmark “A dual polarized dual band microstrip antenna for wireless communications,” IEEE Aerospace Conference Proceedings, 1998.
 Hua-Ming Chen, Yi-Fang Lin, Chin-Chun Kuo, and Kuang Chih Huang, “A compact dual-band microstrip-fed monopole antenna,” IEEE Antennas and Propagation Society International Symposium, 2001 Vol. 2, pp.124-127.
 Ho-yong Kim, Yong-nn Lee, Chung-ho Won, and Hong-min Lcc, “Design of compact dual-band microstrip patch antenna for GPSK-PCS operation,” IEEE Antennas and Propagation Society International Symposium, 2004, Vol. 4, pp. 3529 – 3532.
 K. Oh and K. Hirasawa, “A Dual-Band inverted-L-folded-antenna with a parasitic wire,” IEEE Antennas and Propagation Society International Symposium, 2004, Vol.- 3, pp.3131-3134.
 Ka-Leung Lau and Kwai-Man Luk, “A wide-band circularly polarized l-probe coupled patch antenna for dual-band operation,” IEEE Transactions on Antennas and Propagation, vol. 53, August 2005.
 G. S. Smith, "Loop Antennas," in Antenna Engineering Handbook, 3rd Edition, R. C. Johnson and H. Jasik, editors, McGraw-Hill, New York, 1993.
 C. A. Balanis, “Antenna Theory, Analysis and Design,” John Wiley & Sons, New York, 1997.
 FL Dacus, J Van Niekerk, S Bible, “Introducing loop antennas for short-range radios”, Microwaves & RF, July, 2002. pp. 80-88.
 Lei Zhou, Satish K. Sharma, and Samuel K. Kassegne, “Reconfigurable microstrip rectangular loop antennas using RF mems switches” Microwave and Optical Technology Letters, January 2008,Vol.50, Issue 1, pp. 252–256.
 Rajkumar Bansal, Amrita Jain, Mithilesh Kumar and R.S.Meena, “Design and simulation of dual band microstrip antenna for wireless communication,” International conference on VLSI, Communication and Network, VCAN -2011, Dec. 2011.vol.1. pp.- 263-267.
 Rajkumar Bansal, Amrita Jain, Mithilesh Kumar and R.S.Meena, “Compact Dual Band Microstrip Loop Antenna Using Defective Ground Plane,” International Conference on Communication Systems and Network Technologies, CSNT -2012, 11-13 May 2012.vol.1. pp.- 20-22.
 Halappa R. Gajera, Anoop C.N, M M Naik. G, Archana S. P, Nandini R Pushpitha B.K and Ravi Kumar M.D,“The microstrip fed rectangular microstrip patch antenna (RMPA) with defected ground plane for hiperlan/1,” International Journal of Electronics & Communication Technology, IJECT, Vol. 2, Issue 3, Sept. 2011.pp-172 – 175.
 Gary Breed “An introduction to defected ground structures inmicrostrip circuits” Tutorials on High Frequency Electronics, November 2008, Summit Technical Media, LLC.pp.50-52.
 J. P. Geng, J. J. Li, R. H. Jin, S. Ye, X. L. Liang, and M. Z. Li, “The development of curved mmicrostripantenna with defected ground structure,” Progress In Electromagnetics Research, PIER 98, 2009.pp.-53-73.W.-K. Chen, Linear Networks and Systems (Book style). Belmont, CA: Wadsworth, 1993, pp. 123–135.
 David M. Pozar, Microwave Engineering, Third Edition, John Wiley and Sons, New York, 1998.