Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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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)
  • Received : 2012.09.24
  • Accepted : 2012.11.28
  • Published : 2012.12.31
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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.

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References

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