A surface impedance approach for modeling transmission line losses in FDTD

Author

Thiel, Werner

Author_Institution

Dept. of Microwave Tech., Ulm Univ., Germany

Volume

10

Issue

3

fYear

2000

fDate

3/1/2000 12:00:00 AM

Firstpage

89

Lastpage

91

Abstract

The author presents a concept for an ultrawide-band modeling of transmission line losses in the three-dimensional (3-D) finite-difference time-domain (FDTD) scheme. The approach makes use of the surface impedance boundary condition (SIBC) employing a two-port model for a lossy conducting layer with some modifications at the edges of the metal lines. Using this model, the frequency-dependent inner inductance as well as the resistive losses are included up to very high frequencies. Furthermore, the thickness of the metallization can also be extended over several cells, and the real current distribution on the surface can be considered. For validation, the attenuation coefficient and the effective permittivity of a coplanar line are compared to results achieved from the mode-matching technique

Keywords

coplanar transmission lines; current distribution; finite difference time-domain analysis; inductance; losses; permittivity; skin effect; transmission line theory; 3D FDTD scheme; attenuation coefficient; coplanar line; effective permittivity; finite-difference time-domain scheme; frequency-dependent inner inductance; line loss modeling; lossy conducting layer; metal line edges; metallization thickness; resistive losses; surface current distribution; surface impedance approach; surface impedance boundary condition; transmission line losses; two-port model; ultrawide-band modeling; very high frequencies; Boundary conditions; Current distribution; Finite difference methods; Frequency; Inductance; Metallization; Propagation losses; Surface impedance; Time domain analysis; Transmission lines;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.845706

Filename

845706