Magnet design for ferromagnetic resonators

Details Magnet design for ferromagnetic resonators Magnet design for ferromagnetic resonators

1988-09-12

1989-05-02

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333207, 333223, 333235, H01P 1202, H01P 706

Patent

active

048272302

ABSTRACT:
A ferrimagnetic resonator has improved high frequency response because a shorter, tapered pole shaft is substituted for the longer pole shafts of uniform dimensions in the prior art. This shorter, tapered shaft alleviates constrictions in the field of the magnetic flux, thus allowing for an improved flux density at the tip of the magnet and correspondingly improved high frequency operation of the ferrimagnetic resonator. In a preferred embodiment, the tip of the pole is replaced with a layer of a higher permeability, but also higher hysteresis, alloy to improve the flux density in the air gap where the ferrimagnetic crystal resonator elements reside. In alternative embodiments, the case end of the pole shaft can attain its greater dimensions because of sides that curve outward or that get larger in a series of steps.

REFERENCES:
Rhymes, Two-Sphere YIG Multiplier/Filter Ensures Purity, Apr. 1988, Microwaves & RF, pp. 109-116.
Ishikawa & Chikazumi, Design of High Power Electromagnets, Sep. 1962, Japanese Journal of Applied Physics, pp. 155-173.

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