Electromagnetic filter with a conductive clip retention system and method of assembly
An electromagnetic filter, which may include a feed-through conductor. The feed-through conductor may have an integral extension for contacting an electrically conductive clip. The clip may have an extension-engaging portion to contact the extension and a dielectric component-contacting end to contact a dielectric component. The dielectric component may be, for example, a varistor, a chip capacitor, or the like, capable of affecting a signal carried by the feed-through conductor. The dielectric component may be proximate to the feed-through conductor and may be oriented such that a primary dimension of the dielectric component is substantially parallel to the feed-through conductor. Another embodiment may include a bus. The invention may also be embodied as methods for assembling electromagnetic filters.
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This application claims the benefit of priority to U.S. provisional patent application Ser. No. 60/968,791, filed on Aug. 29, 2007. Further, this patent application is a continuation-in-part of U.S. patent application Ser. No. 12/116,776, filed May 7, 2008, now abandoned. U.S. patent application Ser. No. 12/116,776 claims priority to U.S. provisional patent application Ser. No. 60/928,036, filed on May 7, 2007.
FIELD OF THE INVENTIONThe present invention relates to the use of dielectrics to provide signal conditioning.
BACKGROUND OF THE INVENTIONIn the prior art, it is known to use coaxial dielectric components to condition a signal being carried by a feed-through conductor. Such coaxial arrangements are expensive to manufacture, and do not readily allow for variations in the dielectric response to match differing needs. For example, if one customer desires a different response from the dielectric, it is often expensive to make the change, and may take an undesired amount of time.
To solve this problem, the prior art includes the use of two or more dielectrics, each dielectric being mounted to a substrate near the feed-through conductor. The inventor's previous patent application (U.S. patent application Ser. No. 12/116,776) provides for the use of one or more dielectric components in arrangements which increase the performance of this type of filter. However, improvements are still possible in the flexibility of design and ease of assembly of electromagnetic filters.
SUMMARY OF THE INVENTIONIn the present invention, one or more electrically conductive clips may be used to electrically connect dielectric components to a feed-through conductor. Additionally, a bus may be used to connect a plurality of clips to a feed-through conductor allowing many different configurations of dielectric components to be used for signal conditioning. Using the clips and buses enables greater flexibility in design and easier assembly of electromagnetic filters.
An embodiment of the invention may be made in the form of an electromagnetic filter. The filter may include a feed-through conductor, which may have an integral extension for contacting an electrically conductive clip. The clip may have an extension-engaging portion to contact the extension and a dielectric component-contacting end to contact a dielectric component. The dielectric component may be, for example, a varistor, a chip capacitor, or the like, capable of affecting a signal carried by the feed-through conductor. The dielectric component may be proximate to the feed-through conductor and may be oriented such that a primary dimension of the dielectric component is substantially parallel to the feed-through conductor.
More than one dielectric component may be used in the filter. The clip may have a second dielectric component-contacting end and may be electrically connected to an additional dielectric component. In another embodiment, the dielectric components may have more than one dielectric device connected in series.
The space around the periphery of the feed-through conductor that is not occupied by the dielectric components or clips may be occupied by insulating material. And the filter may have a housing, which may surround the dielectric component(s) and the insulators, if any.
Another embodiment of a filter according to the invention may have a filter mounted on a substrate. The substrate may be, for example, a printed circuit board. The substrate may have an orifice through which the feed-through conductor may extend.
Another embodiment of the present invention may comprise a filter which includes a bus. An electrically conductive clip may have a bus-engaging portion in contact with the bus and a dielectric component-contacting end electrically connected to a dielectric component. The bus may have integral tabs for contacting a feed-through conductor.
The invention may also be embodied as a method for assembling an electromagnetic filter, in which a dielectric component and an electrically conductive clip may be provided. The clip may be placed in contact with the dielectric component (or the dielectric component in contact with the clip). A feed-through conductor with an extension may be provided and placed so that the extension may contact the clip. A force may be exerted so as to cause the extension to move into an extension-engaging portion of the clip. Such a force may be caused, for example, by pushing or pulling the feed-through conductor, the clip, or the extension. For example, the extension may be pressed into the clip. Steps may be added to the method to add a housing and/or insulating material.
The invention may also be embodied as a method for assembling an electromagnetic filter, in which a dielectric component, an electrically conductive clip, and a bus may be provided. The clip may be placed in contact with the dielectric component (or the dielectric component in contact with the clip). The bus may be placed so that the extension may contact the clip. A force may be exerted so as to cause the bus to move into an bus-engaging portion of the clip. Such a force may be caused, for example, by pushing or pulling the bus, the clip, or both. For example, the bus may be pressed into the clip. A feed-through conductor may be provided and placed in contact with the bus. Steps may be added to the method to add a housing and/or insulating material.
For a fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, where like features throughout the drawing figures are denoted by the same reference number, and in which:
An embodiment of the invention may be made in the form of an electromagnetic filter 10.
The far end 46 of at least one arm 40 may be the dielectric component-contacting end 36 of the clip 30. The dielectric component-contacting end 36 may be configured so as to provide a spring force on the first electrical contact 14, for example by curving the dielectric component-contacting end 36 towards the dielectric component 12. In this configuration, the force used to insert the feed-through conductor 13 into the clip 30 may also create a force on the dielectric component 12 to cause the dielectric component-contacting end 36 to contact the first electrical contact 14.
The dielectric component 12 may have dimensions, such as a length dimension, a width dimension and a depth dimension. Herein, reference is made to a “primary dimension”, which is a dimension of the dielectric component 12 for which there is no other dimension that is longer than the primary dimension. In some embodiments of the invention, there will be one dimension of the dielectric component 12 that is the longest dimension, and that will be the primary dimension. In other embodiments of the invention, there will be two or more dimensions that are of equal length and for which there is no other dimension that is longer, and in that situation any of these equal length dimensions may be considered to be the primary dimension.
The dielectric component 12 may be proximate to the feed-through conductor 13 and may be oriented such that the primary dimension of the dielectric component 12 is substantially parallel to the feed-through conductor 13. For example, if the feed-through conductor 13 is cylindrical, the primary dimension of the dielectric component 12 may be oriented to be substantially parallel to the center line of the feed-through conductor 13. In
More than one dielectric component 12 may be used in the filter 10. The clip may have a second dielectric component-contacting end 36 and may be electrically connected to the first electrical contact 14 of the additional dielectric component 12. The dielectric components 12 may be similarly positioned with respect to the feed-through conductor 13 in that they may be proximate to the feed-through conductor 13 so that (1) the size of the clip 30 may be minimized and (2) the field effects of the dielectric component 12 may enhance signal conditioning on a signal transmitted through the feed-through conductor 13. Also, the dielectric components 12 may be oriented similarly with respect to the feed-through conductor 13 in that each dielectric component 12 may be oriented so that the primary dimension of each dielectric component 12 is substantially parallel to the longitudinal dimension 45 of the feed-through conductor 13.
The dielectric components 12 may be positioned at substantially the same lengthwise location of the feed-through conductor 13 so that the electromagnetic effect on the feed-through conductor 13 caused by the dielectric components 12 occurs at substantially the same lengthwise location. In this manner, the dielectric components 12 may provide higher radio-frequency (“RF”) performance (insertion loss) than conventional chip capacitor filter designs. The arrangement of the dielectric components 12 may allow the filter 10 to approach the performance of a coaxial filter, without using a coaxial filter.
The space around the periphery of the feed-through conductor 13 that is not occupied by the dielectric components 12 or clips 30 may be occupied by insulating material 18. For example,
The filter 10 in
Another embodiment of a filter 40 according to the invention is depicted in
The filter 50 may have a housing 15, which may surround the dielectric component(s) 12 and the insulators 18, if any. The second ends 16 of the dielectric components 12 may be electrically connected to the housing 15.
Filter 80 may include more than one dielectric component 12. The clip 30 may have a second dielectric component-contacting end 74 and may be electrically connected to the first electrical contact 14 of the additional dielectric component 12 (not shown in
The space around the periphery of the feed-through conductor 13 that is not occupied by the dielectric components 12, clips 54, or bus 52 may be occupied by insulating material 18. For example, the embodiment in
Having described systems and devices according to the invention, it may be apparent that the invention may include a method of assembling an electromagnetic filter.
U.S. provisional patent application No. 60/968,791, filed on Aug. 29, 2007, discloses additional details about the invention and additional embodiments of the invention. The disclosure of that patent application is incorporated by this reference.
Although the present invention has been described with respect to one or more particular embodiments, it will be understood that other embodiments of the present invention may be made without departing from the spirit and scope of the present invention. Hence, the present invention is deemed limited only by the appended claims and the reasonable interpretation thereof.
Claims
1. An electromagnetic filter, comprising:
- a feed-through conductor having an integral extension extending away from a longitudinal dimension of the feed-through conductor;
- an electrically conductive clip having an extension-engaging portion and a dielectric component-contacting end, wherein the extension-engaging portion contacts the extension; and
- a dielectric component having a first electrical contact and a second electrical contact,
- wherein the first electrical contact is electrically connected to the dielectric component-contacting end of the clip; and
- wherein the extension-engaging portion of the clip comprises: a base having two ends; two arms, each arm having a base end and a far end, wherein each arm's base end is connected to a different one of the two ends of the base; and wherein a distance between the arms is less than a width of the extension, the width being measured perpendicular to the longitudinal dimension.
2. The electromagnetic filter of claim 1, wherein the extension-engaging portion contacts the extension at least two locations on the extension.
3. The electromagnetic filter of claim 1, further comprising an additional dielectric component having a first electrical contact and a second electrical contact, and wherein the clip further comprises a second dielectric component-contacting end electrically connected to the first electrical contact of the additional dielectric component.
4. The electromagnetic filter of claim 1, wherein the extension resides between the two arms.
5. The electromagnetic filter of claim 4, wherein the far end of at least one of the two arms is the dielectric component-contacting end of the clip, and the dielectric component-contacting end is configured to create a spring force on the first electrical contact of the dielectric component.
6. The electromagnetic filter of claim 5, wherein the dielectric component-contacting end is curved.
7. The electromagnetic filter of claim 1, wherein the dielectric component is proximate to the feed-through conductor and a primary dimension of the dielectric component is oriented substantially parallel to the longitudinal dimension of the feed-through conductor.
8. The electromagnetic filter of claim 1, wherein a cross-section of the extension has a shape that differs from a cross-sectional shape of the feed-through conductor, when the cross-sections are taken along a plane perpendicular to the longitudinal dimension of the feed-through conductor.
9. The electromagnetic filter of claim 1, wherein the dielectric component includes at least two dielectric devices electrically connected in series to each other.
10. The electromagnetic filter of claim 1, further comprising a housing surrounding the dielectric component.
11. The electromagnetic filter of claim 10, wherein the second electrical contact of the dielectric component is electrically connected to the housing.
12. The electromagnetic filter of claim 10, further comprising insulating material disposed around the dielectric component.
13. The electromagnetic filter of claim 1, further comprising a substrate having a first side, a second side, and a feed-through surface, the feed-through surface defining an orifice extending from the first side to the second side, and wherein the feed-through conductor extends through the orifice.
14. The electromagnetic filter of claim 13, wherein the second electrical contact of the dielectric component is electrically connected to the substrate.
15. An electromagnetic filter, comprising:
- a feed-through conductor having a longitudinal dimension;
- a bus electrically connected to the feed-through conductor;
- an electrically conductive clip having a bus-engaging portion and a dielectric component-contacting end, wherein the bus-engaging portion contacts the bus; and
- a dielectric component having a first electrical contact and a second electrical contact, wherein the first electrical contact is electrically connected to the dielectric component-contacting end of the clip; and
- wherein the bus-engaging portion of the clip comprises: a base having two ends; two arms, each arm having a base end and a far end, wherein each arm's base end is connected to a different one of the two ends of the base; and wherein a distance between the arms is less than a thickness of the bus.
16. The electromagnetic filter of claim 15, further comprising a substrate having a first side, a second side, and a feed-through surface, the feed-through surface defining an orifice extending from the first side to the second side, and wherein the feed-through conductor extends through the orifice.
17. The electromagnetic filter of claim, wherein the second electrical contact of the dielectric component is electrically connected to the substrate.
18. The electromagnetic filter of claim 15, wherein the bus further comprises an integral tab contacting the feed-through conductor.
19. The electromagnetic filter of claim 15, wherein the bus-engaging portion contacts the bus at least two locations on the bus.
20. The electromagnetic filter of claim 15, wherein the bus resides between the two arms.
21. The electromagnetic filter of claim 20, wherein the far end of at least one of the two arms is the dielectric component-contacting end of the clip, and the dielectric component-contacting end is configured to create a spring force on the first electrical contact of the dielectric component.
22. The electromagnetic filter of claim 21, wherein the dielectric component-contacting end is curved.
23. The electromagnetic filter of claim 15, wherein the dielectric component is proximate to the feed-through conductor and a primary dimension of the dielectric component is oriented substantially parallel to the longitudinal dimension of the feed-through conductor.
24. The electromagnetic filter of claim 15, wherein the dielectric component includes at least two dielectric devices electrically connected in series to each other.
25. The electromagnetic filter of claim 15, further comprising a housing surrounding the dielectric component.
26. The electromagnetic filter of claim 25, wherein the second end of the dielectric component is electrically connected to the housing.
27. The electromagnetic filter of claim 25, further comprising insulating material disposed around the dielectric component.
28. The electromagnetic filter of claim 15, further comprising an additional dielectric component having a first electrical contact and a second electrical contact, and wherein the clip further comprises a second dielectric component-contacting end electrically connected to the first electrical contact of the additional dielectric component.
29. A method of assembling an electromagnetic filter, comprising the steps of:
- providing a dielectric component having a first electrical contact and a second electrical contact;
- providing an electrically conductive clip having an extension-engaging portion and a dielectric component-contacting end; and wherein the extension-engaging portion of the clip comprises: a base having two ends; two arms, each arm having a base end and a far end, wherein each arm's base end is connected to a different one of the two ends of the base; and wherein a distance between the arms is less than a width of the extension, the width being measured perpendicular to the longitudinal dimension;
- placing the dielectric component-contacting end in contact with the first electrical contact in order to form an electrical connection between the dielectric component and the clip;
- providing a feed-through conductor having an integral extension extending away from a longitudinal dimension of the feed-through conductor; and
- exerting a force so as to cause the extension to move into the extension-engaging portion of the clip in order to form an electrical connection between the extension and the clip.
30. The method of claim 29 wherein the extension is pressed into the extension-engaging portion of the clip.
31. The method of claim 29 further comprising the steps of:
- providing a housing; and
- placing the dielectric component within the housing.
32. The method of claim 31 further comprising the step of placing the second electrical contact in contact with the housing to make an electrical connection.
33. The method of claim 31 further comprising the steps of:
- providing insulating material in the housing, the insulating material having a dielectric component void, a clip void, and a conductor void;
- placing the dielectric component into the dielectric component void;
- placing the clip into the clip void; and
- passing the feed-through conductor through the conductor void.
34. A method of assembling an electromagnetic filter, comprising the steps of:
- providing a dielectric component having a first electrical contact and a second electrical contact;
- providing an electrically conductive clip having a bus-engaging portion and a dielectric component-contacting end, wherein the bus-engaging portion of the clip comprises: a base having two ends; two arms, each arm having a base end and a far end, wherein each arm's base end is connected to a different one of the two ends of the base; and wherein a distance between the arms is less than a thickness of the bus;
- placing the dielectric component-contacting end in contact with the first electrical contact in order to form an electrical connection between the dielectric component and the clip;
- providing a bus;
- exerting a force so as to cause the bus to move into the bus-engaging portion of the clip in order to form an electrical connection between the bus and the clip;
- providing a feed-through conductor; and
- placing the feed-through conductor in contact with the bus.
35. The method of claim 34 wherein the bus is pressed into the bus-engaging portion of the clip.
36. The method of claim 34 further comprising the steps of:
- providing a housing; and
- placing the dielectric component within the housing.
37. The method of claim 36 further comprising the step of placing the second electrical contact in contact with the housing to make an electrical connection.
38. The method of claim 36 further comprising the steps of:
- providing insulating material in the housing, the insulating material having a dielectric component void, a clip void, a bus void, and a conductor void;
- placing the dielectric component into the dielectric component void;
- placing the clip into the clip void;
- placing the bus into the bus void; and
- passing the feed-through conductor through the conductor void.
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Type: Grant
Filed: Aug 29, 2008
Date of Patent: Dec 27, 2011
Patent Publication Number: 20090140826
Assignee: Spectrum Control, Inc. (Fairview, PA)
Inventors: Jeffrey D. Chereson (Erie, PA), Rob Ehrensberger (Erie, PA)
Primary Examiner: Benny Lee
Attorney: Hodgson Russ LLP
Application Number: 12/202,215
International Classification: H03H 7/01 (20060101);