Frequency Characteristics of the Radiation Boundary Condition in Finite-Difference Time-Domain Method and Its Improvement

Masao KODAMA  Mitsuru KUNINAKA  

IEICE TRANSACTIONS on Communications   Vol.E77-B   No.1   pp.81-85
Publication Date: 1994/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
finite-difference time-domain method,  one-way wave equation,  radiation boundary condition,  

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When we use the finite-difference time-domain (FD-TD) method to study time-domain electromagnetic fields in the unbounded surroundings, we frequently use a radiation boundary condition (RBC) by means of one-way wave equations. The reflection coefficient by the RBC is independent of frequency, but the reflection coefficient of the finite difference approximation for the RBC depends on a frequency also; this study examines how the reflection characteristics are affected by the frequency, and the study presents the coefficients used in the RBC which gives expected reflection characteristics for a frequency, and presents the application to simulation of the matched termination of a rectangular waveguide.