Penetration of an EM Wave into a Cylindrical Cavity and the Current Induced on a Wire Inside.
Abstract
This paper addresses the problem of computing the current induced in a thin wire located inside a cylindrical cavity with a circumferential slot when the cavity is illuminated by an incident plane wave. The calculation is carried out in two steps. First, the problem of penetration of the incident field into the cavity is solved by the method of moments under the assumption that the presence of the wire inside the cavity creates little or no perturbation of the interior field. Next, the induced current on the wire is calculated by the following two methods: use of a simple analytical formula derived from the application of the Wiener-Hopf techniques to the finite wire problem; and numerical solution of an integral equation. Extensive numerical results for the induced current are presented. It is found that the current is sensitive to the cylinder radius, the cavity height, the frequency of excitation, and the wire location, but is relatively less sensitive to the variation in the slot length. In addition, the induced current on a wire inside the cavity can be much larger than its counterpart in free space illuminated by the same incident plane wave at frequencies where the cavity is near resonance. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1978
- Accession Number
- ADA058769
Entities
People
- E. K. Yung
- Raj Mittra
- Seh Wook Lee
Organizations
- University of Illinois Urbana–Champaign