Magnetostrictive rod filters

Details Magnetostrictive rod filters Magnetostrictive rod filters

1979-01-09

1981-03-17

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310 26, 333148, H03H 962, H03H 9135

Patent

active

042570220

ABSTRACT:
Magnetostrictive rod filter whose attenuation versus frequency curve has a resonance as the conventional magnetostrictive rod filters but also a pole at a frequency near the resonance frequency. The filter comprises a freely vibrating magnetostrictive rod, two windings symmetrically located with respect to the rod center and surrounding the rod, ferrimagnetic material sheaths surrounding the windings except on the parts thereof facing the rod and means for applying a d.c. magnetic field to the rod. The pole of the attenuation curve is due to a demagnetizing field created by portions of the rod externally projecting beyond the windings and by apertures in those parts of the sheaths facing these rod projecting portions.

REFERENCES:
patent: 1882394 (1932-10-01), Pierce
patent: 1882396 (1932-10-01), Pierce

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