UTD-Based Analysis of Antenna Radiation Patterns on PEC Surfaces with Thin Material Coating

This study explores the application of the Uniform Geometrical Theory of Diffraction (UTD) to examine how material coatings influence the radiation pattern of a slot array antenna placed on a curved surface. The analysis considers a range of dielectric constants for the coating materials. The UTD framework for coated cylindrical geometries is employed to simulate the electromagnetic (EM) wave behavior of the antenna. A uniformly aligned slotted array antenna is evaluated using the UTD-based radiation model. Numerical results are provided to demonstrate the effects of the coating material on radiation pattern characteristics, including side-lobes and back-lobes. The findings are validated through comparison with results from commercial EM simulation software, showing strong agreement.