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http://dx.doi.org/10.5515/JKIEES.2012.12.4.260

Determination of Surface Currents on Circular Microstrip Antennas  

Godaymi, Wa'il A. (Dept. of Physics, College of Science, Univ. of Basrah)
Mohammed, Abdul-Kareem Abd Ali (Atmosphere and Space Science Center, Ministry of Science and Technology)
Ahmed, Zeki A. (Dept. of Physics, College of Science, Univ. of Basrah)
Publication Information
Abstract
This work aims to present a theoretical analysis of the electric and magnetic surface current densities of a circular microstrip antenna (CMSA) as a body of revolution. The rigorous analysis of these problems begins with the application of the equivalence principle, which introduces an unknown electric current density on the conducting surface and both unknown equivalent electric and magnetic surface current densities on the dielectric surface. These current densities satisfy the integral equations (IEs) obtained by canceling the tangential components of the electric field on the conducting surface and enforcing the continuity of the tangential components of the fields across the dielectric surface. The formulation of the radiation problems is based on the combined field integral equation. This formulation is coupled with the method of moments (MoMs) as a numerical solution for this equation. The numerical results of the electric and magnetic surface current densities on the outside boundary of a CMSA excited by $TM_{11^-}$ and $TM_{21^-}$ modes are presented. The radiation pattern is calculated numerically in the two principle planes for a CMSA and gives a good results compared with measured results published by other research workers.
Keywords
Microstrip Antennas; Body of Revolutions;
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  • Reference
1 I. J. Bahl, P. Bahartia, Microstrip Antennas, Artech House Inc., 1980.
2 D. D. Sandu, O. G. Avadanei, A. Ioachim, and D. Ionesi, "Contribution to the cavity model for analysis of microstrip patch antennas," Journal of Optoelectronics and Advanced Materials, vol. 8, no. 1, pp. 339-344, 2006.
3 K. Alexander, "Aperture-coupled microstrip patch antenna array," Diplomarbeit, Friedhofallee 4a/11, A-2232 Deutsch-Wagram, 1996.
4 R. F. Harrington, Field Computation by Moment Methods, Macmillan, New York, 1968.
5 R. Garg, P. Bhartia, I. Bahl, and A. Ittipiboon, Microstrip Antenna Design Handbook, Artech House Inc., 2001.
6 A. A. Kishk, L. Shafai, "Numerical solution of scattering from coated bodies of revolution using different integral equation formulations," IEE Proc., vol. 133, Pt. H. no. 3, pp. 227-232, 1986.
7 J. R. James, P. S. Hall, Handbook of Microstrip Antennas, Peter Peregrines, London, U. K., 1989.
8 L. N. Medgyesi-Mitschang, J. H. Mullen,, "Radiation and scattering from asymmetrically excited bodies of revolution," IEEE Trans. Anten. and Propag., pp. 90-93, 1976.
9 K. A. Iskander, L. Shafai, A. Frandsen and J. E. Hansen, "Application of impedance boundary conditions to numerical solution of corrugated circular horns," IEEE Trans. Anten. and Propag., vol. AP-30, no. 3, pp. 366-372, 1982.   DOI
10 P. L. Huddleston, L. N. Medgyesi-Mitschang, and J. M. Putnam, "Combined field integral equation formulation for scattering by dielectrically coated conducting bodies," IEEE Trans. Anten. and Propag., vol. Ap-34, no. 4, pp. 510-520, 1986.   DOI
11 Y. T. Lo, D. Solomon, and W. F. Richards, "Theory and experiment on microstrip antennas," IEEE Trans. Anten. and Propag., vol. AP-27, no. 2, pp. 137-146, 1979.   DOI