A ferrite-filled cylindrical cavity

Author

Chu, T.S. ; Kouyoumjian, R.G.

Author_Institution

Ohio State University, Columbus, OH, USA

Volume

7

Issue

5

fYear

1959

fDate

12/1/1959 12:00:00 AM

Firstpage

273

Lastpage

278

Abstract

The modes in a ferrite-filled cylindrical waveguide have been analyzed, and a characteristic equation given for their propagation constants in terms of the frequency and applied magnetic field. However, there have been no reported experimental confirmations of these solutions. It is convenient to carry out the experiment by measuring the related resonances in a ferrite-filled cylindrical cavity. This has been done for the $F_{0n0}$ and $F_{0n1}$ , modes in a symmetrically excited cavity. The measured resonant frequencies are in general agreement with numerical results based on the solution of the characteristic equation and the theories of Polder and Rado. Assuming that $\\mu_{z}\\approx \\mu$ , the components of the tensor permeability below the magnetic saturation of the ferrite may be determined over a range of frequencies from the measured curves of resonance. This type of measurement avoids certain difficulties inherent with the perturbation method. The curves of resonance may also be used to calculate the gyromagnetic ratio of the ferrite.

Keywords

Ferrite-loaded resonators; Gyromagnetic materials/devices; Equations; Ferrites; Frequency measurement; Magnetic analysis; Magnetic field measurement; Magnetic resonance; Permeability; Propagation constant; Resonant frequency; Tensile stress;

fLanguage

English

Journal_Title

Antennas and Propagation, IRE Transactions on

Publisher

ieee

ISSN

0096-1973

Type

jour

DOI

10.1109/TAP.1959.1144768

Filename

1144768