A quasi-static modification of TLM at knife edge and 90° wedge singularities

Author

Cascio, Lucia ; Tardioli, Giampaolo ; Rozzi, Tullio ; Hoefer, Wolfgang J R

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada

Volume

44

Issue

12

fYear

1996

fDate

12/1/1996 12:00:00 AM

Firstpage

2519

Lastpage

2524

Abstract

A common drawback of numerical techniques such as transmission line method (TLM) and finite-difference time-domain method (FDTD) resides in the difficulty to accurately describe the electromagnetic field in structures with singularities. In this paper a local modification of the two-dimensional (2-D) TLM algorithm for the nodes surrounding a knife edge and a 90° wedge is proposed. A quasi-static approximation of the field is used to derive an equivalent circuit of the edge. The proposed theory is then extended to the characterization of infinitely thin septa, the vertex of which is located anywhere between the nodes of the TLM mesh. The proposed corner correction is compared with the uncorrected TLM results and with data available in the literature, revealing a marked enhancement in the accuracy and convergence of the results

Keywords

electromagnetic fields; equivalent circuits; finite difference time-domain analysis; transmission line matrix methods; waveguide discontinuities; TLM; corner correction; electromagnetic field; equivalent circuit; finite-difference time-domain method; infinitely thin septa; knife edge; local modification; quasi-static approximation; quasi-static modification; uncorrected TLM results; wedge singularities; Convergence; Electromagnetic analysis; Electromagnetic fields; Equivalent circuits; Finite difference methods; Frequency domain analysis; Helium; Time domain analysis; Transmission line theory; Two dimensional displays;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.554591

Filename

554591