Noise filter

Details Noise filter Noise filter

1993-11-01

1995-07-11

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428615, 428620, 428210, 428901, B32B 900

Patent

active

054319870

ABSTRACT:
A noise filter used in a signal transmission or power supply circuit and the like for suppressing noise passing therethrough comprises a first spiral electrode formed on an insulating substrate and a second spiral electrode formed over the first spiral electrode by way of a dielectric layer. The noise filter could also include a dielectric layer formed over the first spiral electrode and the insulating substrate with the second spiral electrode formed in such a manner to partly overlap with the first spiral electrode. Preferably, a high purity semiconductor substrate having a large bulk resistance is used as the insulating substrate.

REFERENCES:
patent: 5004640 (1991-04-01), Nakatani et al.
patent: 5079065 (1992-01-01), Masakazu et al.
patent: 5118556 (1992-06-01), Makino et al.

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