MEASUREMENT OF LINEWIDTH OF SINGLE CRYSTAL FERRITES USING A SHORTED TRANSMISSION LINE

A technique is described for measuring the linewidth of single crystals of ferrites which is accurate, rapid, easy to use, and can be readily adapted to give a visual display of the resonance curve. At C-band, the normalized equivalent resistance due to the ferrite sphere at resonance (expressed as...

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Bibliographic Details
Main Author: Bady,I
Format: Report
Language:English
Subjects:
Electricity and Magnetism
FERRITES
FERROMAGNETIC MATERIALS
HYSTERESIS
LINEWIDTH
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MEASUREMENT
MICROWAVES
Miscellaneous Materials
RESONANT FREQUENCY
SINGLE CRYSTALS
SPHERES
TRANSMISSION LINES
WAVE PROPAGATION
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Description
Summary:A technique is described for measuring the linewidth of single crystals of ferrites which is accurate, rapid, easy to use, and can be readily adapted to give a visual display of the resonance curve. At C-band, the normalized equivalent resistance due to the ferrite sphere at resonance (expressed as a parallel component) agrees well with theory whether the sphere is undercoupled, critically coupled, or overcoupled to the transmission line. However, a substantial reactive component is present when the sphere is near critical coupling or overcoupled, and this is contrary to theory. It is concluded that measurement of linewidth should be taken under conditions where the sphere is substantially undercoupled.