Accession Number : AD0623133

Title :   RADIATION FROM SOME PERIODIC STRUCTURES EXCITED BY A WAVEGUIDE.

Descriptive Note : Technical rept.,

Corporate Author : ILLINOIS UNIV URBANA ANTENNA LAB

Personal Author(s) : Karjala,D. S. ; Mittra,R.

Report Date : OCT 1965

Pagination or Media Count : 78

Abstract : The problem of radiation from a set of semi-infinite parallel plates, as well as those of radiation from uniform and modulated corrugated surfaces excited by a parallel plane waveguide, are solved exactly. The method used is an extension of the conventional mode matching technique so that it is applicable to open structures. A Fourier transform taken perpendicular to the plates and matching across the plane which separates the structure and the semiinfinite region into which it is radiating, taken together with certain periodicity properties of the unknown functions in the transform domain, allows generation of an infinite set of algebraic equations which may be solved exactly. From the solution of these equations nearly all results of interest may be obtained: the reflection coefficient, the mode coefficients, which represent the field in the structure, the radiation pattern, the k-beta diagram, and the amplitudes of the surface waves launched. Fairly extensive numerical results for these quantities were obtained. (Author)

Descriptors :   (*ANTENNA RADIATION PATTERNS, WAVEGUIDES), (*WAVEGUIDES, EXCITATION), FOURIER ANALYSIS, BOUNDARY VALUE PROBLEMS, ELECTROMAGNETIC WAVE REFLECTIONS, DIELECTRICS, METAL PLATES

Distribution Statement : APPROVED FOR PUBLIC RELEASE