Normal-mode analysis of ferrite-coupled lines using microstrips or slotlines

Author

Soon Teoh, Chin ; Davis, Lionel E.

Author_Institution

Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK

Volume

43

Issue

12

fYear

1995

fDate

12/1/1995 12:00:00 AM

Firstpage

2991

Lastpage

2998

Abstract

A normal-mode analysis of a pair of axially-magnetized ferrite-coupled lines (FCL) is presented for the first time. This normal-mode method, as opposed to the coupled-mode method, will permit optimization of propagation characteristics and impedance-matching. Also, the finite element solution of the normal modes can be used to obtain the field distribution to assist suitable placement of ferrite for device applications. Potential applications include a novel 4-port distributed microstrip circulator which may have advantages over junction devices at millimetric wavelengths. Optimum normal-mode conditions for the use of the FCL as a component in the distributed circulator are derived, and the design procedure for microstrip FCL is presented for the first time

Keywords

ferrite circulators; finite element analysis; impedance matching; magnetic millimetre wave devices; microstrip components; microstrip lines; millimetre wave circulators; slot lines; transmission line theory; 4-port distributed microstrip circulator; ferrite-coupled lines; field distribution; finite element solution; impedance-matching; microstrips; normal-mode analysis; propagation characteristics optimisation; slotlines; Demagnetization; Ferrites; Finite element methods; Impedance; Magnetic analysis; Magnetic devices; Microstrip components; Optimization methods; Saturation magnetization; Slotline;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.475665

Filename

475665