Title :
Calculation of the fundamental cutoff frequency in a case of waveguides of doubly connected cross section
Author :
Laura, P.A.A. ; Diez, L. ; Gianetti, C. ; Luisoni, L.E. ; Grossi, R.
Author_Institution :
Institute of Applied Mechanics, Naval Base de Puerto Belgrano, Argentina
Abstract :
The lowest cutoff frequency of a circular waveguide with a concentric inner polygonal domain is determined using a conformal mapping variational approach. The results are verified by means of a modified Randall´s empirical rule. It is shown that this technique leads also to good relative accuracy in the case of polygonal domains with a concentric circular domain.
Keywords :
Boundary conditions; Conformal mapping; Cutoff frequency; Eigenvalues and eigenfunctions; Electromagnetic analysis; Electromagnetic propagation; Electromagnetic waveguides; Maxwell equations; Partial differential equations; Tellurium;
Journal_Title :
Proceedings of the IEEE
DOI :
10.1109/PROC.1977.10717
