Accession Number : ADA112785

Title :   Near Field Solutions for Antennas on Elliptic Cylinder.

Descriptive Note : Quarterly rept. 15 Mar-14 Jun 77,


Personal Author(s) : Wang,Nan

PDF Url : ADA112785

Report Date : Jul 1977

Pagination or Media Count : 53

Abstract : Near-zone radiation characteristics for antennas on elliptic cylinders are investigated. Integral representations in terms of Fock functions for the radiated fields are employed throughout the entire space surrounding the cylinder. In the illuminated region, uniform representations employing Fock functions are used. This integral representation recovers the geometric-optics solution when the field point is far away from the lit-dark boundaries. In the shadow region, an asymptotic solution in terms of Fock functions is obtained from the canonical problem of antennas radiating from a circular cylinder. This integral representation reduces to the creeping-wave (residue) series representation in the deep shadow region. Smooth, continuous patterns are observed for fields across the lit-dark boundaries. The solutions obtained for a circular cylinder are then generalized to elliptic cylinders on the basis of the local nature of high-frequency propagation. This report presents the theory and numerical results for the near-zone fields due to antennas mounted on circular and elliptic cylinders. Excellent agreement is obtained between the high-frequency asymptotic solutions and other solutions to the same problem.

Descriptors :   *Antennas, *High frequency, *Ellipses, *Cylindrical bodies, Numerical analysis, Near field, Mounts, Illumination, Optics, Patterns, Integrals, Asymptotic series, Slot antennas

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE