Some considerations on the accuracy of the nonuniform FDTD method and its application to waveguide analysis when combined with the perfectly matched layer technique

Author

Navarro, Enrique A. ; Sangary, Nagula T. ; Litva, John

Author_Institution

Dept. de Fisica Aplicada, Valencia Univ., Spain

Volume

44

Issue

7

fYear

1996

fDate

7/1/1996 12:00:00 AM

Firstpage

1115

Lastpage

1124

Abstract

The accuracy of the finite-difference time-domain (FDTD) technique is measured with respect to the mesh´s cell dimensions. The accuracy of the FDTD technique is investigated for those applications that demand the use of nonuniform meshes. The results of simulations suggest that second-order accuracy can be achieved. These simulations are carried out using different boundary conditions. It is observed that the choice of boundary conditions plays a large role in the accuracy that is achieved with the FDTD method. The perfectly matched layer (PML) technique is found to be well suited to waveguide analysis because of its wide bandwidth, and the ease with which it can be implemented with a nonuniform mesh. We apply the nonuniform FDTD method, in combination with the PML technique, to analyze a narrow iris in waveguide

Keywords

error analysis; finite difference time-domain analysis; waveguide discontinuities; waveguide theory; boundary conditions; finite-difference time-domain technique; narrow iris; nonuniform FDTD method; nonuniform meshes; perfectly matched layer technique; waveguide analysis; Bandwidth; Boundary conditions; Boundary value problems; Dielectrics; Finite difference methods; Iris; Partial differential equations; Perfectly matched layers; Physics; Time domain analysis;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.508646

Filename

508646