Abstract
A convenient procedure to obtain the radiation pattern of slot antennas consists of assuming that the conducting ground plane containing the slot is infinitely long. While this may be adequate for obtaining the radiation pattern in the half space of the aperture, for obtaining the complete radiation pattern of the antenna the proper dimensions of the ground plane have to be considered. The effect of the ground plane thickness on the radiation pattern for aperture antennas with the slots assumed as sources of cylindrical or spherical waves is examined using the geometrical theory of diffraction (GTD). The diffraction from the upper and lower edges of the ground plane was calculated considering the multiple diffractions between the edges. Numerical results are presented and discussed. >
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