An improved unimodal absorbing boundary condition for waveguide problems

Author

Jung, Kyung-Young ; Kim, Hyeongdong ; Ko, Kwang-Cheol

Author_Institution

Dept. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea

Volume

7

Issue

11

fYear

1997

fDate

11/1/1997 12:00:00 AM

Firstpage

368

Lastpage

370

Abstract

An improved unimodal absorbing boundary condition (ABC) is proposed by using one-dimensional (1-D) mode finite-difference time-domain (FDTD). In the unimodal ABC, an uniform auxiliary waveguide of input-output port should be introduced so that evanescent waves attenuate sufficiently. In this letter, the uniform auxiliary waveguide is simulated by 1-D mode FDTD rather than three-dimensional (3-D) FDTD which is used in the conventional unimodal ABC. Memory storage and CPU time are significantly reduced by applying the proposed ABC. A WG-90 rectangular waveguide with a thick asymmetric iris is analyzed by FDTD with the conventional modal ABC and the proposed ABC, and scattering parameters and computational efficiency are compared

Keywords

S-parameters; electromagnetic wave absorption; finite difference time-domain analysis; rectangular waveguides; waveguide theory; 1D mode FDTD; WG-90 rectangular waveguide; computational efficiency; evanescent waves attenuat; finite-difference time-domain method; input-output port; scattering parameters; thick asymmetric iris; uniform auxiliary waveguide; unimodal ABC; unimodal absorbing boundary condition; waveguide problems; Boundary conditions; Computational efficiency; Computational modeling; Costs; Finite difference methods; Iris; Rectangular waveguides; Scattering parameters; Time domain analysis; Wideband;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.641423

Filename

641423