Controlled-impedance cable termination using compliant interconnect elements

Abstract

An apparatus for terminating a controlled-impedance cable using compliant electrical contacts to provide an interface to another device. The terminator includes an anchor block for securing the cable. Optionally, the anchor block is electrically non-conductive. A conductive ferrule is installed on the cable shield and the cable end is dressed. The ferrule/cable assembly is installed in a through hole in the anchor block so the cable end is flush with the anchor block face. An insulating or conductive plate mounted to the anchor block holds the signal contact that electrically connects the center conductor to the device and optional ground contacts that electrically connect the ferrule to the device. The ground contacts surround the signal contact in a pattern that closely mimics the impedance environment of the cable. When using a conductive plate, the signal contact is insulated from the plate by an insulating centering plug or a non-conductive coating.An apparatus for terminating a controlled-impedance cable using compliant electrical contacts to provide an interface to another device. The terminator includes an anchor block for securing the cable. An electrically-conductive ferrule is installed on the cable shield and the cable end is dressed. The ferrule/cable assembly is installed in a through hole in the anchor block so that the cable end is flush with the anchor block face. An electrically-conductive plate mounted to the anchor block face holds the signal contact that electrically connects the center conductor to the device and optional ground contacts that electrically connect the ferrule to the device. The signal contact is insulated from the plate by an insulating plug. The ground contacts surround the signal contact in a pattern that closely mimics the impedance environment of the cable.

What is claimed is: 
     
       1. A controlled-impedance cable termination for a controlled-impedance cable, the cable comprising at least one center conductor, a dielectric surrounding the at least one center conductor, and a ground shield surrounding the dielectric, the termination comprising:
 (a) an anchor block having a face and at least one cable through hole, the cable through hole having an opening in the face;   (b) a electrically-conductive ferrule adapted to be installed on the ground shield at the end of the cable, the ferrule adapted to be captured in the cable through hole;   (c) a plate attached to the face, the plate having a face surface abutting the face and a device surface, the plate including at least one signal through aperture extending between the face surface and the device surface, the signal aperture having a signal block opening adjacent to and aligned with the cable through hole opening, the signal aperture having a signal device opening in the device face; and   (d) an electrically-conductive compliant signal contact captured within each of the at least one signal aperture, the signal contact having a signal block contact point extending from the signal block opening and a signal device contact point extending from the signal device opening.   
     
     
       2. The cable termination of  claim 1  wherein the anchor block is composed of an electrically-nonconductive material. 
     
     
       3. The cable termination of  claim 1  wherein the ferrule is captured in the cable through hole by a press fit. 
     
     
       4. The cable termination of  claim 1  wherein the ferrule is removably captured in the cable through hole. 
     
     
       5. The cable termination of  claim 1  wherein the plate is composed of an electrically insulating material and the cable termination further comprises:
 (a) the plate including a plurality of ground through apertures spaced from and surrounding the at least one signal aperture, each of the ground apertures extending between the face surface and the device surface, the ground apertures each having an anchor block opening in the face surface and a ground device opening in the device face; and 
 (b) an electrically-conductive compliant ground contact captured within each of the ground apertures, the ground contact having an anchor block contact point extending from the anchor block opening into electrical contact with the ferrule and a ground device contact point extending from the ground device opening. 
 
     
     
       6. The cable termination of  claim 1  wherein the plate is composed of an electrically-conductive material and the signal aperture is within an electrically-nonconductive plug in the plate. 
     
     
       7. The cable termination of  claim 6  further comprising:
 (a) the plate including a plurality of ground through apertures spaced from and surrounding the at least one signal aperture, each of the ground apertures extending between the face surface and the device surface, the ground apertures each having an anchor block opening in the face surface and a ground device opening in the device face; and 
 (b) an electrically-conductive compliant ground contact captured within each of the ground apertures, the ground contact having a ferrule contact point extending from the anchor block opening into electrical contact with the ferrule and a ground device contact point extending from the ground device opening. 
 
     
     
       8. A controlled-impedance cable termination assembly comprising:
 (a) at least one controlled-impedance cable having at least one center conductor, a dielectric surrounding the center conductor, and a ground shield surrounding the dielectric;   (b) an anchor block having a face and at least one cable through hole, the cable through hole having an opening in the face;   (c) an electrically-conductive ferrule installed on the ground shield at the end of the cable to form a ferrule/cable assembly, the ferrule/cable assembly captured in the cable through hole such that the cable end is flush with the block face;   (d) a plate attached to the face, the plate having a face surface abutting the face and a device surface, the plate including at least one signal through aperture extending between the face surface and the device surface, the signal aperture having a signal block opening adjacent to and aligned with the cable center conductor, the signal aperture having a signal device opening in the device face; and   (e) an electrically-conductive compliant signal contact captured within each of the at least one signal aperture, the signal contact having a signal block contact point extending from the signal block opening into electrical contact with the center conductor and a signal device contact point extending from the signal device opening.   
     
     
       9. The cable termination of  claim 8  wherein the anchor block is composed of an electrically-nonconductive material. 
     
     
       10. The cable termination of  claim 8  wherein the ferrule is captured in the cable through hole by a press fit. 
     
     
       11. The cable termination of  claim 8  wherein the ferrule is removably captured in the cable through hole. 
     
     
       12. The cable termination of  claim 8  wherein the plate is composed of an electrically-insulating material and the cable termination further comprises:
 (a) the plate including a plurality of ground through apertures spaced from and surrounding the at least one signal aperture, each of the ground apertures extending between the face surface and the device surface, the ground apertures each having an anchor block opening in the face surface and a ground device opening in the device face; and 
 (b) an electrically-conductive compliant ground contact captured within each of the ground apertures, the ground contact having an anchor block contact point extending from the anchor block opening into electrical contact with the ferrule and a ground device contact point extending from the ground device opening. 
 
     
     
       13. The cable termination of  claim 8  wherein the plate is composed of an electrically-conductive material and the signal aperture is within an electrically-nonconductive plug in the plate. 
     
     
       14. The cable termination of  claim 13  further comprising:
 (a) the plate including a plurality of ground through apertures spaced from and surrounding the at least one signal aperture, each of the ground apertures extending between the face surface and the device surface, the ground apertures each having an anchor block opening in the face surface and a ground device opening in the device face; and 
 (b) an electrically-conductive compliant ground contact captured within each of the ground apertures, the ground contact having an anchor block contact point extending from the anchor block opening into electrical contact with the ferrule and a ground device contact point extending from the ground device opening. 
 
     
     
       15. A controlled-impedance cable termination for a controlled-impedance cable, the cable comprising at least one center conductor, a dielectric surrounding the at least one center conductor, and a ground shield surrounding the dielectric, the termination comprising:
 (a) an anchor block having a block face and a cable through hole, the cable through hole having an opening in the block face;   (b) an electrically-conductive ferrule adapted to be installed on the ground shield at the end of the cable, the ferrule having a ferrule face and adapted to be captured in the cable through hole;   (c) a plate composed of an electrically-conductive material and attached to the block face, the plate having a face surface abutting the block face and a device surface;   (d) a signal through hole in the plate extending between the face surface and the device surface;   (e) an insulating plug within the signal through hole, the insulating plug extending between the face surface and the device surface and having a signal through aperture with a signal block opening adjacent to and aligned with the cable through hole opening and a signal device opening in the device surface; and   (f) an electrically-conductive compliant skewed coil signal contact captured within the signal through aperture, the signal contact having a signal block contact point extending from the signal block opening and a signal device contact point extending from the signal device opening.    
     
     
       16. The controlled-impedance cable termination of claim 15 wherein the ferrule is removably captured in the cable through hole.  
     
     
       17. The controlled-impedance cable termination of claim 15 further comprising a plurality of ferrules and a plurality of cable though holes, each of the plurality of ferrules adapted to be captured in one of the plurality of cable through holes such that the faces of the plurality of ferrules are coplanar.  
     
     
       18. The controlled-impedance cable termination of claim 15 further comprising:
 (a) a plurality of ground through apertures in the plate spaced from and surrounding the signal aperture, each of the plurality of ground through apertures extending between the face surface and the device surface, the plurality of ground through apertures each having a ground block opening in the face surface and a ground device opening in the device surface; and   (b) an electrically-conductive compliant skewed coil ground contact captured within each of the ground apertures, the ground contact having a ferrule contact point extending from the ground block opening into electrical contact with the ferrule and a ground device contact point extending from the ground device opening.    
     
     
       19. The controlled-impedance cable termination of claim 15 wherein the plate is comprised of two sheets.  
     
     
       20. The controlled-impedance cable termination of claim 19 wherein the two sheets are mirror images, each including half of the signal through hole.  
     
     
       21. The controlled-impedance cable termination of claim 19 wherein one sheet has a majority of the signal through hole.  
     
     
       22. The controlled-impedance cable termination of claim 15 wherein the insulating plug is comprised of two parts.  
     
     
       23. A controlled-impedance cable termination assembly comprising:
 (a) a controlled-impedance cable having at least one center conductor, a dielectric surrounding the at least one center conductor, and a ground shield surrounding the dielectric;   (b) an anchor block having a block face and a cable through hole, the cable through hole having an opening in the block face;   (c) an electrically-conductive ferrule having a ferrule face and installed on the ground shield at the end of the cable to form a ferrule/cable assembly, the ferrule/cable assembly captured in the cable through hole such that the cable end is flush with the block face;   (d) a plate composed of an electrically-conductive material and attached to the block face, the plate having a face surface abutting the block face and a device surface;   (e) a signal through hole in the plate extending between the face surface and the device surface;   (f) an insulating plug within the signal through hole, the insulating plug extending between the face surface and the device surface and having a signal through aperture with a signal block opening adjacent to and aligned with the cable center conductor and a signal device opening in the device surface;   (g) an electrically-conductive compliant skewed coil signal contact captured within the signal through aperture, the signal contact having a signal block contact point extending from the signal block opening into electrical contact with the cable center conductor and a signal device contact point extending from the signal device opening.    
     
     
       24. The controlled-impedance cable termination assembly of claim 23 wherein the ferrule is removably captured in the cable through hole.  
     
     
       25. The controlled-impedance cable termination assembly of claim 23 further comprising a plurality of ferrule/cable assemblies and a plurality of cable though holes, each of the plurality of ferrule/cable assemblies captured in one of the plurality of cable through holes such that the faces of the plurality of ferrules are coplanar.  
     
     
       26. The controlled-impedance cable termination assembly of claim 23 further comprising:
 (a) a plurality of ground through apertures in the plate spaced from and surrounding the signal aperture, each of the plurality of ground through apertures extending between the face surface and the device surface, the plurality of ground through apertures each having a ground block opening in the face surface and a ground device opening in the device surface; and   (b) an electrically-conductive compliant skewed coil ground contact captured within each of the plurality of ground through apertures, the ground contact having a ground block contact point extending from the ground block opening into electrical contact with the ferrule and a ground device contact point extending from the ground device opening.    
     
     
       27. The controlled-impedance cable termination assembly of claim 23 wherein the plate is comprised of two sheets.  
     
     
       28. The controlled-impedance cable termination assembly of claim 27 wherein the two sheets are mirror images, each including half of the signal through hole.  
     
     
       29. The controlled-impedance cable termination assembly of claim 27 wherein one sheet has a majority of the signal through hole.  
     
     
       30. The controlled-impedance cable termination assembly of claim 23 wherein the insulating plug is comprised of two components.