Importance

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Abstract

A ferrite resonating device operative for example as an oscillator or filter includes a mechanism for mechanically varying the position of a permanent magnet while maintaining a fixed main gap in which a ferrite resonating element is placed so that wide tuning can be achieved while maintaining electrical parameters substantially constant. In a specific embodiment, the ferrite resonating device includes a high-permeability shell, a permanent magnet disposed within the shell adjacent the main gap in which is mounted a ferrite resonating element, such as a YIG sphere, a field straightener formed of high-permeability material and disposed between the permanent magnet and the main gap for straightening magnetic field lines through the main gap, a secondary gap in the magnetic circuit, and an adjustment plug mounted to mechanically displace the permanent magnet relative to the field straightener for adjusting size of the secondary gap and optionally to shunt magnetic flux and thereby to control the frequency of resonance of the ferrite element over a broad range of frequencies.

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First Claim