In this paper, the calculation of Sommerfeld Integral with Chebyshev decomposition is first discussed. After evalaution of the current distribution on the electromagnetic coupling (EMC) microstrip antennas and the mutual coupling between dipoles among the microstrip array, the radiation characteristics of a five-elements array is determined. The efficiency of the present calculation has been greatly improved because of the use of Chebyshev decomposition technology. Finally, the effect of the tail fin of an airplane on the radiation Caracteristics of an airborne five-elements microstip Array are calculated with the Uniform Theory of Geometrical Diffraction.
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