Electromagnetic field analysis of the wire antenna in the presence of a dielectric with three-dimensional shape

Author

Tsuboi, H. ; Tanaka, H. ; Fujita, M.

Author_Institution

Dept. of Electr. & Electron. Eng., Okayama Univ., Japan

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3602

Lastpage

3604

Abstract

A numerical method which can take account of lossy dielectrics near the antenna has to be developed for the design of the radio-frequency antenna in magnetic resonance imaging, since the human body is a lossy dielectric. A combination of the moment method and the boundary element method is proposed. In the proposed method, the scattering field of dielectrics in the moment method is calculated by using the equations of the boundary element method, and the impressed field of current distribution in the boundary element method is calculated by using the approximation of the current distribution in the moment method. A helical antenna loaded with a cylinder was chosen as a calculation model, and the calculated results were compared with experimental results, verifying the method´s applicability

Keywords

antenna radiation patterns; biomedical NMR; boundary-elements methods; loop antennas; boundary element method; current distribution; helical antenna; human body; impressed field; lossy dielectrics; magnetic resonance imaging; moment method; numerical method; radio-frequency antenna; scattering field; three-dimensional shape; wire antenna; Boundary element methods; Current distribution; Dielectric losses; Electromagnetic analysis; Electromagnetic fields; Magnetic analysis; Magnetic resonance imaging; Moment methods; Radio frequency; Wire;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42376

Filename

42376