Low noise magnetically tuned resonant circuit

Details Low noise magnetically tuned resonant circuit Low noise magnetically tuned resonant circuit

1987-04-02

1988-07-19

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 77, 333219, H03L 706

Patent

active

047588004

ABSTRACT:
A magnetically tuned resonant circuit having improved noise performance includes a ferrimagnetic or gyromagnetic body such as a YIG sphere which is disposed within r.f. structure, The r.f. structure is disposed between a pair of pole pieces of a biasing magnet and flux return path. Several techniques are described for reducing fluctuations in magnetic fields through the gyromagnetic body. The gyromagnetic body is isolated from conductive surfaces, or the bulk of conductive surfaces in the region adjacent to the magnetic body are reduced. Further, a technique is also described which provides a break in the electrical continuity around the r.f. structure. Each of these technique reduce the magnitude of thermally induced eddy current flow in conductive regions adjacent to the resonant body. It is believed that such eddy current flow produce random magnetic field variations which produce random variations in the frequency characteristics of conventional magnetically tuned resonant circuits.

REFERENCES:
patent: 3895312 (1975-07-01), Tipon
patent: 4415854 (1983-11-01), Remy
patent: 4543543 (1985-09-01), Blight et al.
patent: 4555678 (1985-11-01), Galani et al.
patent: 4651116 (1987-03-01), Schloemann
Taylor Lyman et al., "Magnetically Soft Materials", Metals Handbook, 8th Edition, vol. 1, Properties and Selection of Metals, (1961), p. 790.

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