High Frequency Radiation Pattern Analysis for Antennas Mounted on Material-Coated Conducting Platforms of General Shape
Abstract
Despite the ever-increasing availability of computational resources, high-frequency asymptotic techniques continue to play an important role in computational electromagnetics (CEM) analyses involving electrically large platforms. For purposes of antenna-pattern analysis, the Uniform Geometrical Theory of Diffraction (UTD) may be considered to be a highly advantageous technique because it includes creeping-wave field components that are essential to accurate pattern computation in the shadow region. While the implementation of the UTD ha historically been limited to platform models derived from simple canonical shapes such as cylinders, plates and ellipsoids, implementation of the UTD for a very general class of platform models represented in terms of triangular facets has recently been demonstrated. Another significant limitation of the UTD has been the restriction to the case of perfect conductivity, which has been required due to the lack of available solutions for other cases. In particular, available creeping-ray solutions for fields in the shadow region of a convex body have been limited to the case of perfect conductivity. Recently, an asymptotic approximate Maxwell solution for boundary layer fields excited by an arbitrarily-oriented tangential magnetic source residing on a convex impedance surface of general shape was obtained in creeping-ray modal format. In this paper, a companion solution for fields radiated into the far zone of a convex singly-coated surface of general shape is developed. An outline for a UTD treatment of pattern analysis for antennas mounted on singly coated platforms of general shape is indicated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 23, 2004
- Accession Number
- ADA438809
Entities
People
- Paul Hussar
Organizations
- Alion Science and Technology