Abstract
Formulas based on the two-slot, the cavity, and the surface current models to compute the far-field radiation patterns in both the E and H planes for rectangular microstrip antenna elements are studied and their validity assessed. Three closed-form formulas are presented for the calculation of the radiation patterns in the E plane for antenna elements with substrates thicker than those reported elsewhere. These are derived by modifying the two-slot model by the use of empirically derived correction factors, taking into account the power radiated in space and surface waves, the surface-wave model coefficients, and the line extension. The capability of the developed formulas is illustrated by comparison between the computed results and experimental measurements. The computed results are in good agreement with measurements. The H-plane patterns are computed from the two-slot model and/or the cavity models. The half-power beamwidth in the E and H planes have also been determined for each of the antenna elements investigated in this work. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 14: 360–367, 1997.
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