Contribuição teórica ao estudo de estruturas periódicas de micro-ondas.

Abstract

This work deals with periodic structures in the microwave range. Classical analysis techniques and solutions are presented for several of these structures. Formulate theoretically the problem of applying the Complex Power Conservation Technique to the analysis of periodic structures, which, in conjunction with the Generalized Spreading Matrix Technique, includes, in addition to the propagating modes, evanescent modes. The parallel plane transmission line and the rectangular waveguide, both loaded with thick diaphragms, are considered. It has developed and a computational program was implemented for calculating the input admittance and scattering matrices of the junction between two parallel plane waveguides of uneven heights, as well as the waveform matrix of the unit cell of the parallel plane waveguide loaded periodically . The results are in agreement with those previously obtained by Safavi-Nainie Macphie, (*) SAFAVI-NAINI, Reza and MACPHIE, Robert H., "On Solving Waveguide Junction Scattering Problems by the Conservation of Complex Power Technique, "IEEE Trans. Microwave Theory Tech., Vol. MTT-29, pp.337-343 1981. for the characterization of the step in the guide of parallel planes. Flowcharts are presented that facilitate the development of a program for the numerical analysis of a periodically charged rectangular waveguide. For the determination of the eigenvalues ​​and eigenvectors of the periodic structures we suggest the use of the algorithm QZ.