Open AccessA generalized method for scattering from wide cavities with specified wave functions
Author(s) -
Bozorgi Mehdi
Publication year - 2020
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/mia2.12015
Subject(s) - eigenfunction , scattering , mathematical analysis , modal , moment (physics) , method of moments (probability theory) , waveguide , physics , optics , plane wave , plane (geometry) , function (biology) , space (punctuation) , mathematics , eigenvalues and eigenvectors , geometry , classical mechanics , quantum mechanics , computer science , materials science , estimator , evolutionary biology , polymer chemistry , biology , operating system , statistics
This study developed a generalized solution based on modal expansion for scattering by large cavities with known wave functions placed in an infinite perfect electric plane. Under the assumption of a large cavity, to reduce simulation time and simplify expressions, the half‐space above cavity with a strong singular Green's function is substituted by an arbitrary semi‐waveguide. The fields inside the cavity are expanded by the semi‐waveguide eigenfunctions. The corresponding modes are matched to create a system of linear equations for unknown expansion coefficients. To demonstrate the validity and ability of this method, it is applied to several grooves with different shapes (triangular, circular, and elliptical grooves) and then their scattering signatures are compared with each other. The results are also verified by the results obtained by the method of moment. The measured simulation time for both methods shows that this scheme can be an appropriate candidate for analysing the scattered fields by large cavities.