Feedthrough capacitor having reduced self resonance...

Details Feedthrough capacitor having reduced self resonance... Feedthrough capacitor having reduced self resonance...

2007-05-31

2009-11-24

Ha, Nguyen T (Department: 2831)

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

C361S303000, C361S305000, C361S306100, C361S306300, C361S321200, C607S005000, C607S007000, C607S009000

Reexamination Certificate

active

07623336

ABSTRACT:
The self-resonance insertion loss dip of a feedthrough capacitor is reduced or eliminated by raising the equivalent series resistance of the capacitor, thus minimizing the capacitor Q. The equivalent series resistance of the capacitor can be raised by forming voids in the active and/or ground electrode plates of the capacitor. The electrode plates may be formed so as to have a relatively reduced thickness, or a relatively increased thickness. A conductive material having a relatively high resistivity may be used to form the active and/or ground electrode plates of the capacitor. Alternatively, the conductive material forming the electrode plates may have a dielectric material added thereto.

REFERENCES:
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patent: 5999398 (1999-12-01), Makl et al.
patent: 6008980 (1999-12-01), Stevenson et al.
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Robert A. Stevenson, P.E., Mike Lowder, Improved EMI Filter Insertion Loss Test Methods, Equipment and Fixtures, CARTS 96: 16th Capacitor and Resistor Technology Symposium, Mar. 11-15, 1996.
Bob Stevenson, PE, Dissipation Factor Testing is Inadequate for Medical Implant EMI Filters and Other High Frequency MLC Capacitor Applications, CARTS 2003: 23rd Capacitor and Resistor Technology Symposium, Mar. 31-Apr. 3, 2003.
Bob Stevenson, EMI Filters for Medical Devices, slide presentation given at 2000 Medical Device and Manufacturing Symposium, Anaheim, CA.

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