Abstract
The main objective of this paper is to investigate how the ground plane size affects the fields radiated by slot antennas. What is considered in the formulation of the problem is a rectangular slot cut in a flat metal plate. The total field radiated by a slot antenna in finite size ground plane is the superposition of the primary field which is the field radiated by the slot in infinite ground and the secondary field which is the field diffracted from the edges of the finite ground plane. An integration carried out using the magnetic current as the excitation produces the primary field radiated while Uniform geometrical Theory of Diffraction employed as an analytical tool enables the determination of the secondary field. It is found out that the E-plane field radiated by a slot antenna on a finite size ground plane is about 1–3dB higher than that of a similar slot on an infinite size ground plane. In the H-plane, the strength of the edge diffraction is insignificant and as such has no contribution to the total field radiated by the slot in a finite ground plane.
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