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Near Fields of Microstrip Antennas

By S. A. Bokhari, Jean-frangois Ziircher, Juan R. Mosig, Senior Member and Freddy E. Gardiol


Abstract-The paper presents an iterative method for the computation of the near fields of single layer microstrip patch antennas. A judicious combination of the advantages of the MPIE (mixed potential integral equation) method, the FFT algorithm and the biconjugate gradient leads to an efficient numerical solution. The scheme can deal with patches of arbitrary shapes and is capable of dealing with a very large number of unknowns. Near field computation is done in a straightforward manner by computing the weighted near fields. For illustration, three patches belonging to the family of generalized annular sector have been chosen. Computed results of input impedances with a coaxial probe excitation have been compared with measurements. Computed near field amplitudes have also been compared with measured results where possible. Computed far field characteristics have been correlated with the near field information. I

Year: 2011
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