Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1998-02-18
1999-09-28
Reichard, Dean A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
361303, 3613061, 361309, 333182, H01G 435
Patent
active
059598298
ABSTRACT:
An electromagnetic interference (EMI) filter capacitor assembly is provided for shielding and decoupling a conductive terminal pin or lead of the type used, for example, in an implantable medical device against passage of external interference signals. The EMI filter is constructed of relatively inexpensive ceramic chip capacitors which replace relatively expensive feedthrough capacitors as found in the prior art. The chip capacitors are mounted directly onto a hermetic feedthrough terminal in groups of two or more which vary in physical size, dielectric material and capacitance value so that they self-resonate at different frequencies. This "staggering" of resonant frequencies and direct installation at the hermetic terminal provides the EMI filter with sufficient broadband frequency attenuation. In one preferred form, multiple chip capacitor groupings are mounted onto a common base structure, with each capacitor grouping associated with a respective terminal pin. In another preferred form, a non-conductive substrate is provided with metalized circuit traces to better accommodate the mounting of the chip capacitors. Additionally, novel chip capacitor geometry/termination-metallization is provided which significantly reduces the internal inductance of the capacitor to improve its high frequency performance as an EMI filter.
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Article entitled "Carts '97"; published Mar. 24, 1997; sponsored by The Components Technology Institute, Inc.; 11 pages.
Brendel Richard L.
Haskell Donald K.
Louder Mike
Stevenson Robert A.
Woods Jason
Dinkins Anthony
Maxwell Energy Products, Inc.
Reichard Dean A.
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