Wide bandwidth Microstrip Patch Antenna Coupled with Step-Loaded Structure

  • Halgurd N. Awl Department of Communication, Engineering College, Sulaimani Polytechnic University, Kurdistan Region–Iraq
  • Rashad H. Mahmud Department of Physics, College of Education ,Salahaddin University-Erbil, Kurdistan Region–Iraq.
Keywords: Microstrip antenna, antenna bandwidth, microwave, Radar.


            With the development of modern communication systems, the demand for small size, low cost, light weight, high performance antenna has increased. For this purpose, various types of the microstrip antenna proposed by researchers. In this paper, new design of the microstrip patch antenna is presented. The conventional rectangular microstrip patch structure is modified to a unique Step-Loaded structure in order to enhance the antenna bandwidth.  The antenna is simulated and operated within the frequency range 8-15 GHz using the Computer Simulation Technology (CST) Microwave Studio. The antenna provides a very good return loss which is below -10 dB over the entire operating frequency range. The bandwidth is 60 % at the center frequency 11.5 GHz.  The realized gain varies from 3 dBi at the frequency 8 GHz to 4.5 dBi at the frequency 4.5 GHz. Due to the symmetry of the Step-Loaded structure, the antenna provides omnidirectional radiation patterns in both E- and H-planes. This feature could be of interest in the field of microwave radar applications.         


Currie, A., & Brown, M. A. 1992. Wide-swath SAR. In IEE Proceedings F (Radar and Signal Processing) (Vol. 139, No. 2, pp. 122-135). IET Digital Library.
Gibson, P. J. (1979). The vivaldi aerial. In Microwave Conference, 1979. 9th European (pp. 101-105). IEEE.
Granholm, J., & Skou, N. 2000. Dual-polarization, wideband microstrip antenna array for airborne C-band SAR. In Phased Array Systems and Technology, 2000. Proceedings. 2000 IEEE International Conference on (pp. 243-246). IEEE.
Han, T. Y., & Huang, C. T. 2010. Reconfigurable monopolar patch antenna. Electronics Letters, 46(3), 199-200.
Rafique, U., Ali, S.A. and Shabbir, G., 2014, December. Ultra-wideband patch antenna for microwave communications. In Multi-Topic Conference (INMIC), 2014 IEEE 17th International(pp. 10-13). IEEE.
Rashad H. M. 2016. Synthesis of waveguide antenna arrays using the coupling matrix approach. PhD dessitation, The University of Birmingham.
Stockburger, E. F., & Held, D. N. 1995. Interferometric moving ground target imaging. In Radar Conference, 1995., Record of the IEEE 1995 International (pp. 438-443). IEEE.
Tripathi, A.K. and Singh, B.K., 2013, December. A cpw fed x-band antenna for satellite & radar applications. In Microwave and Photonics (ICMAP), 2013 International Conference on(pp. 1-3). IEEE.
How to Cite
N. Awl, H. and H. Mahmud, R. (2019) “Wide bandwidth Microstrip Patch Antenna Coupled with Step-Loaded Structure”, Zanco Journal of Pure and Applied Sciences, 31(s4), pp. 34-37. doi: 10.21271/zjpas.31.s4.5.