Nonreciprocity and the optimum operation of ferrite coupled lines

Author

Xie, Kang ; Davis, Lionel E.

Author_Institution

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

Volume

48

Issue

4

fYear

2000

fDate

4/1/2000 12:00:00 AM

Firstpage

562

Lastpage

573

Abstract

The first full-wave normal-mode analysis of ferrite coupled lines (FCLs) magnetized in the longitudinal direction is presented in this paper. It is found that the tangential and axial components of the guided electric and magnetic fields undergo a different change in the process of reversing the direction of magnetization. These changes cause the same input wave to decompose into the eigenmodes of the FCL differently for different direction of magnetization and, consequently, cause the nonreciprocal behavior of the magnetized FCL. A new optimum nonreciprocal operation condition is obtained, and applications to FCL circulators built on microstrips and striplines are discussed

Keywords

coupled transmission lines; eigenvalues and eigenfunctions; ferrite circulators; ferrite waveguides; FCL circulators; eigenmodes; ferrite coupled lines; full-wave normal-mode analysis; longitudinal magnetisation direction; nonreciprocal behavior; nonreciprocity; Circulators; Couplings; Ferrite devices; Magnetic analysis; Magnetic fields; Magnetization; Microstrip; Microwave frequencies; Stripline; Transmission line theory;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.842028

Filename

842028