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Measurement of Microwave Dielectric Constants and Tensor Permeabilities of Ferrite Spheres

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3 Author(s)
Spencer, E.G. ; Diamond Ordnanice Fuze Labs., Washington 25, D.C. ; Lecraw, R.C. ; Reggia, F.

The Bethe-Schwinger cavity perturbation theory is applied to measurements of the microwave dielectric constants and tensor permeabilities of small spherical samples of ferrites. For the dielectric constant measurements, a cavity opened at a position of minimum transverse wall currents is used. A frequency-shift method is used for measuring the real part of the dielectric constant and a cavity-transmission method is used for measurement of the loss tangent. Circularly-polarized cavity methods yield effective scalar permeabilities of which the real and the imaginary parts are measured in a manner similar to the dielectric measurements. These scalar permeabilities yield sufficient information to describe completely the tensor components. Experimental data are given for a polycrystalline magnesium-manganese ferrite, to illustrate the techniques described.

Published in:

Proceedings of the IRE  (Volume:44 ,  Issue: 6 )