Surface mountable multi-layer ceramic filter

Patent metadata

Field	Value
Publication number	US-9287844-B2
Application number	US-201213542007-A
Country	US
Kind code	B2
Filing date	Jul 5, 2012
Priority date	Jul 7, 2011
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

An improved electronic filter is provided with capacitance and integral inductance properties. The filter has a capacitor with first planer internal electrodes in electrical contact with a first termination and second planer internal electrodes in electrical contact with a second termination. A dielectric is between the first planer internal electrodes and the second planer internal electrodes. A third termination is provided and a conductive trace on a surface of the capacitor is between the third termination and the first termination. A ferromagnetic or ferrimagnetic material is coupled to the conductive trace.

First claim

The invention claimed is:

1. An electronic filter comprising:
a capacitor comprising:
a plurality of first planar internal electrodes in electrical contact with a first termination;
a plurality of second planar internal electrodes in electrical contact with a second termination; and
a dielectric between said plurality of first planar internal electrodes and said plurality of second planar internal electrodes;

a third termination;
a conductive trace over a surface of said capacitor; wherein said conductive trace is between said third termination and said first termination; and
a ferromagnetic or ferrimagnetic material in a heat cured polymer on said surface of said capacitor and coupled to said conductive trace, wherein a portion of said conductive trace is between said surface of said capacitor and said ferromagnetic or ferrimagnetic material.

2. The electronic filter of claim 1 wherein a first planar internal electrode of said plurality of first planar internal electrodes and a second planar internal electrode of said plurality of second planar internal electrodes are in a common plane.

3. The electronic filter of claim 2 further comprising a floating electrode between a first plane comprising the plurality of first planar internal electrodes and an adjacent second plane comprising the plurality of second planar internal electrodes.

4. The electronic filter of claim 1 wherein said plurality of first planar internal electrodes and said plurality of second planar internal electrodes are interleaved.

5. The electronic filter of claim 1 further comprising:
a plurality of third planar internal electrodes in electrical contact with said third termination; and
a plurality of fourth planar internal electrodes in electrical contact with a fourth termination.

6. The electronic filter of claim 5 wherein a third planar internal electrode of said plurality of third planar internal electrodes and a fourth planar internal electrode of said plurality of fourth planar internal electrodes are in a common plane.

7. The electronic filter of claim 6 further comprising a floating electrode between a first plane comprising the plurality of first planar internal electrodes and an adjacent second plane comprising the plurality of second planar internal electrodes.

8. The electronic filter of claim 5 wherein said plurality of third planar internal electrodes and said plurality of fourth planar internal electrodes are interleaved.

9. The electronic filter of claim 1 further comprising:
a second conductive trace over said surface of said capacitor; wherein said second conductive trace is between said first termination and a fourth termination; and
a second ferromagnetic or ferrimagnetic material coupled to said second conductive trace.

10. The electronic filter of claim 1 further comprising:
a plurality of third planar internal electrodes in electrical contact with said first termination; and
a plurality of fourth planar internal electrodes interleaved with said plurality of third planar internal electrodes; wherein said plurality of fourth planar internal electrodes are in electrical contact with a fourth termination.

11. The electronic filter of claim 10 wherein said plurality of third planar internal electrodes are in electrical contact with said first termination by a conductive connector.

12. The electronic filter of claim 11 wherein said conductive connector is a second conductive trace over said surface of said capacitor.

13. The electronic filter of claim 1 further comprising a conductive shell on said electronic filter.

14. The electronic filter of claim 1 further comprising a non-conductive shell over at least said ferromagnetic or ferrimagnetic material.

15. An electronic filter comprising: a capacitor comprising:
a plurality of first planar internal electrodes in electrical contact with a first termination;
a plurality of second planar internal electrodes in electrical contact with a second termination;
a plurality of common planes, wherein for each common plane of said plurality of common planes a first planar internal electrode of said plurality of first planar internal electrodes and a second planar internal electrode of said plurality of second planar internal electrodes are coplanar;
a plurality of third planar internal electrodes interleaved with said plurality of common planes;
a dielectric between each said common plane and said plurality of third planar internal electrodes;
a third termination;
a conductive trace over a surface of said capacitor; wherein said conductive trace is between said third termination and said first termination; and
a ferromagnetic or ferrimagnetic material coupled to said conductive trace;
a second conductive trace over said surface of said capacitor; wherein said second conductive trace is between said first termination and a fourth termination; and
a second ferromagnetic or ferrimagnetic material coupled to said second conductive trace.

16. An electronic filter comprising: a capacitor comprising:
a plurality of first planar internal electrodes in electrical contact with a first termination;
a plurality of second planar internal electrodes in electrical contact with a second termination;
a plurality of common planes, wherein for each common plane of said plurality of common planes a first planar internal electrode of said plurality of first planar internal electrodes and a second planar internal electrode of said plurality of second planar internal electrodes are coplanar;
a plurality of third planar internal electrodes interleaved with said plurality of common planes;
a dielectric between each said common plane and said plurality of third planar internal electrodes;
a third termination;
a conductive trace over a surface of said capacitor; wherein said conductive trace is between said third termination and said first termination; and
a ferromagnetic or ferrimagnetic material coupled to said conductive trace, wherein a portion of said conductive trace is between said surface and said ferromagnetic or ferrimagnetic material.

17. The electronic filter of claim 16 further comprising a non-conductive shell over at least said ferromagnetic or ferrimagnetic material.

18. The electronic filter of claim 16 further comprising a conductive shell on said electronic filter.

19. The electronic filter of claim 16 further comprising:
said plurality of third planar internal electrodes in electrical contact with said third termination; and
a plurality of fourth planar internal electrodes in electrical contact with a fourth termination.

20. The electronic filter of claim 19 wherein said electrical contact with said third termination comprises a conductive connector.

21. The electronic filter of claim 20 wherein said conductive connector is a second conductive trace on said surface of said capacitor.

22. A method of providing an electronic circuit comprising:
providing an electronic filter comprising: a capacitor comprising:
a plurality of first planar internal electrodes in electrical contact with a first termination;
a plurality of second planar internal electrodes in electrical contact with a second termination; and
a dielectric between said plurality of first planar internal electrodes and said plurality of second planar internal electrodes;
a plurality of third planar internal electrodes in electrical contact with said first termination;
a plurality of fourth planar internal electrodes in electrica

Assignees

• Bultitude John
• Laps Mark R
• Magee James R
• Jones Lonnie G
• Kemet Electronics Corp

Inventors

• Bultitude John
• Laps Mark R
• Magee James R
• Jones Lonnie G

Classifications

• H01P1/20345

  Multilayer filters · CPC title

• Y10T29/4913

  Assembling to base an electrical component, e.g., capacitor, etc. · CPC title

• H03H1/0007

  of radio frequency interference filters · CPC title

• H01F2017/0026

  Multilayer LC-filter · CPC title

• H03H9/00

  Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators (electro-acoustic transducers such as loudspeakers, microphones or gramophone pick-ups H04R; piezoelectric, electrostrictive or magnetostrictive devices with mechanical input or output, e.g. actuators or sensors, H10N30/00, H10N35/00) · CPC title