Advisor(s)

Nian-Xiang Sun

Contributor(s)

Vincent G. Harris, Carmine Vittoria, Ali Abur, Yaman Yener

Date of Award

2008

Date Accepted

7-2008

Degree Grantor

Northeastern University

Degree Level

M.S.

Degree Name

Master of Science

Department or Academic Unit

College of Engineering. Department of Electrical and Computer Engineering.

Keywords

Electrical and computer engineering, Ferrite coupled lines

Subject Categories

Coupled mode theory, Ferromagnetism--Mathematical models

Disciplines

Engineering

Abstract

The Y-type hexagonal ferrite based FCL (Ferrite Coupled Lines), which is the main component of the Y-type in-plane circulator, was analyzed using the coupled mode theory. The even-mode and odd-mode field distribution was calculated with full wave analysis in a quasi-static model. A computer program was created to perform the full wave analysis, which when combined with the coupled mode theory, gave the optimum length of the device. A novel in-plane circulator structure, MMFCL (metal magnetic film coupled line) circulator that uses metallic magnetic material instead of ferrite is presented. A long ""needle"" geometry of the metal magnetic strip was used to provide a strong effective uniaxial anisotropy field along the coupled lines length's direction, and at the same time it minimized the loss caused by the metallic characteristics of the metallic material. Simulations were performed with Ansoft Inc. HFSS and the optimum length of the device was obtained based on coupled mode theory. Simulation results show that the insertion loss S21 and S32 are better than -4dB, and the isolation S12, S23 and S31 are lower than -13.5 dB from 36.5GHz to 39.5GHz.

Document Type

Master's Thesis

Rights Holder

Jianwei Wang


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