Accession Number : AD0645064

Title :   AXIALLY DEPENDENT PERTURBATION ANALYSIS USING NONLINEAR PHASE PROGRESSION: MODIFICATIONS AND EXTENSIONS FOR GROSS PERTURBATIONS,

Corporate Author : COLUMBIA UNIV NEW YORK DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Richter,S. L. ; Diament,P. ; Schlesinger,S. P.

Report Date : MAY 1966

Pagination or Media Count : 83

Abstract : The iterative perturbation analysis using nonlinear phase progression, previously developed for dealing with axially dependent perturbations on an otherwise axially uniform wave propagating structure, is here modified and extended. One modification of the basic technique readily permits some significant higher order effects of the perturbation to be determined directly from first order calculations. Further modifications drastically reduce the limitations on the size of the perturbation, permitting the corrections to the wave functions to be of even the same order of magnitude as the unperturbed waves. Since the method specifically seeks phase progression factors, it is particularly well suited to electromagnetic propagation problems, especially those which may involve effects strongly dependent upon the phase progression of the perturbed wave. The analysis for gross perturbations given here is therefore applied to situations involving gross dielectric inhomogeneities perturbing an otherwise uniform waveguide and to parasitic traveling wave antennas. The question of the application of the method to problems involving scatterers from conducting obstacles in waveguides is also discussed. (Author)

Descriptors :   (*WAVE PROPAGATION, *PERTURBATION THEORY), PROPAGATION, ANTENNA ARRAYS, PHASE SHIFT CIRCUITS, WAVEGUIDES, DIELECTRICS, SCATTERING

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE