THEORY AND MEASUREMENT OF A SURFACE WAVEGUIDE,
Abstract
A surface waveguide, which consists of a dielectric slab backed by a perfect conductor lying between and perpendicular to two parallel conducting planes, is excited by a slot source at a frequency of 9,339 Mc. The resulting electromagnetic fields are obtained both experimentally and analytically. The fields are measured by the reflection from a thin metal cylinder and this technique is shown to be accurate within one db for test cases with no dielectric present. Two components of the electric field are measured over distances from 0.5 gamma to 25 gamma from the source for eight thicknesses of Plexiglas ranging from 0.10 inch to 0.30 inch. In the analysis of the problem, the dielectric is considered to include loss and the Fourier integral transform for the field is evaluated by the method of steepest descents. An asymptotic expansion results which consists of the saddle point and pole contributions. It is shown that the 'improper' and 'leaky' poles as well as surface wave poles contribute to the fields. In this treatment correction terms are added to the usual residues to assure continuity of the fields everwhere and a decay away from the source in all directions for all pole contributions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 25, 1963
- Accession Number
- AD0430079
Entities
People
- David E. Norton
Organizations
- University of California, Berkeley