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Frequency Characteristics of the Radiation Boundary Condition in Finite-Difference Time-Domain Method and Its Improvement
Masao KODAMA Mitsuru KUNINAKA
IEICE TRANSACTIONS on Communications
Publication Date: 1994/01/25
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
finite-difference time-domain method, one-way wave equation, radiation boundary condition,
Full Text: PDF(317.3KB)>>
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.