Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
  • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
  • H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
  • H01R24/42—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency comprising impedance matching means or electrical components, e.g. filters or switches
  • H01R24/44—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency comprising impedance matching means or electrical components, e.g. filters or switches comprising impedance matching means
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/646—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00 specially adapted for high-frequency, e.g. structures providing an impedance match or phase match
  • H01R13/6473—Impedance matching

Definitions

• the present invention relates to electrical cable
• terminations more particularly, to controlled impedance cable terminations which are generally used to transmit high- frequency signals in electronic equipment.
• a cable termination is to provide an interconnect from the cable to the electrical device and to provide a separable electrical interconnection between the cable and its operating environment.
• the characteristic of separability means that the cables are not interconnected by permanent mechanical means, such as soldering or bonding, but by temporary mechanical means.
• controlled-impedance cables are terminated using a conventional type connector which is also controlled- impedance.
• Examples include an SMA (SubMiniature version A) connector or cables that are soldered to a printed circuit board (PCB) which is then separably connected to the working environment.
• the SMA connectors while being generally the same impedance environment as the cable, have impedance mismatches which cause high-frequency attenuation at the point of interface between the cable and the connector and the connector and its working environment, such as like a PCB. Additionally, these cable terminations often require through holes in PCB ' s for mounting and, consequently, it can be difficult to design the best possible controlled impedance environment.
• These types of cable terminations are generally for a single cable and require a substantial amount of PCB area to terminate, thereby decreasing the density capability of connections.
• the cables may need to be very precise and have a consistent electrical length in order to be useful in certain applications.
• the electrical length refers to the amount of time it would take an electrical signal to propagate the entire length of a cable. It is important that the
• electrical length be held consistent cable to cable through several flexure cycles or thermal excursions.
• planarity of the cable center conductor and ground shield can be difficult to maintain through flexure or thermal excursions.
• the present invention is a controlled-impedance cable termination that minimizes the effects of cable expansion and contraction on impedance matching.
• the terminator of the present invention employs compliant electrical contacts 12, 14 and an expansion/contraction compensator (ECC) 16 to provide an interface between the controlled-impedance cable and another device.
• ECC expansion/contraction compensator
• the terminator has an anchor block for securing the cables, an expansion/contraction compensator (ECC) attached to the end of the cable, a compliant signal contact for making the electrical connection between the cable center conductor and the electrical device, optional compliant ground contacts for making the electrical connection between the cable shield and the ground plane of the device, and an optional plate mounted to the face of the anchor block that holds the contacts.
• ECC expansion/contraction compensator
• the ECC is installed on the cable and in a cable through hole in the anchor block.
• the present invention contemplates that the ECC can be permanently installed in the block cable through hole or is designed to be removable.
• the ECC has a number of embodiments.
• Each embodiment includes an electrically-conductive ferrule with a bore.
• the cable shield is attached to the upper end of the ferrule bore.
• the cable shield can be attached in any way practical, such as by soldering, crimping, adhesive, etc.
• the cable shield may be attached to a ground boss that is installed and secured in the ferrule bore.
• the center conductor extends through a section of the ferrule bore with only air, the parameters of which are adjusted to maintain impedance control.
• a cylindrical, solid dielectric insert fits into the ferrule bore and operates as an extension of the cable and air dielectric.
• An electrically-conductive center pin fits into a bore in the dielectric insert and operates as an extension of the center conductor. The parameters of the dielectric insert and center pin are adjusted to maintain impedance control.
• the center pin has a bore that accepts the center
• a coupling provides the electrical connection between the center conductor and the center pin while
• the present invention contemplates any number of methods of providing the coupling.
• the center conductor fits snuggly within the bore such that the center conductor can expand and contract, while maintaining electrical contact with the center pin.
• the bore is filled with a conductive epoxy or elastomer. The elastomer electrically connects the center conductor to the center pin and stretches when the center conductor expands and contracts.
• the anchor block is made from an insulating material and the ground contacts alone couple the cable shield via the ECC ferrule to the ground plane of the device.
• the anchor block is conductive to provide a common ground for the cable shields.
• the ferrule bore may not be in an independent component, but formed directly in the conductive anchor block.
• the plate holds the compliant contacts and its structure depends on the type of contact. Regardless of the type of contact, the plate has several common features.
• the plate has an anchor block face surface that abuts the anchor block face and a device surface that generally abuts the device.
• the plate has at least one through aperture for the contacts.
• Each aperture has an anchor block face opening and a device face opening.
• the apertures for the signal contacts are aligned with the corresponding center pin face in the anchor block.
• the plate can be either insulating or conductive.
• a conductive plate electrically couples the ground contacts, thereby providing more precise impedance matching to the signal contact.
• the signal contact is insulated from the conductive plate by an insulating centering plug.
• Skewed coil and conductive rubber contacts are two forms of compliant contacts contemplated by the present invention.
• the signal contact is an element of the ECC, for example, a pogo pin extending from the center pin.
• the center pin has a bore with a spring and a pogo pin extending from the bore.
• FIG. 1 is an isometric view of the cable termination assembly of the present invention for use with coaxial cables ;
• FIG. 2 is a front view of the cable termination assembly of FIG. 1 connected to a device;
• FIG. 3 is a side view of the cable termination assembly of FIG. 1;
• FIG. 4 is an exploded view of the cable termination assembly of FIG. 1 ;
• FIG. 5 is a top cross-sectional view of the cable
• FIG. 6 is a front cross-sectional view of the cable termination assembly of FIG. 3 taken along the line B-B;
• FIG. 7 is a detailed view of FIG. 6 taken at C showing the coax cable termination
• FIG. 8 is an exploded, cross-sectional, side view of the press-in, air dielectric embodiment of the
• FIG. 9 is a cross-sectional, side view of the embodiment of FIG. 8 assembled with a cable
• FIG. 10 is a detailed, cross-sectional, side view of a detent central conductor/central pin coupling with the central conductor;
• FIG. 11 is a detailed, top view of one configuration of the detent central conductor/central pin coupling of FIG. 10;
• FIG. 12 is a detailed, cross-sectional, side view of a slot pinch central conductor/central pin coupling
• FIG. 13 is a detailed, top view of the slot pinch central conductor/central pin coupling of FIG. 12;
• FIG. 14 is a detailed, cross-sectional, side view of a conductive elastomer central conductor/central pin coupling with the central conductor;
• FIG. 15 is an exploded, cross-sectional view of the press-in solid embodiment of the expansion/contraction compensator ;
• FIG. 16 is a cross-sectional view of the embodiment of FIG. 15 assembled with a cable
• FIG. 17 is a bottom view of the embodiment of FIG. 15;
• FIG. 18 is an exploded, cross-sectional view of the flanged embodiment of the expansion/contraction compensator;
• FIG. 19 is a cross-sectional view of the embodiment of FIG. 18 assembled with a cable
• FIG. 20 is an exploded, cross-sectional view of the separable air dielectric embodiment of the
• FIG. 21 is a cross-sectional view of the embodiment of FIG. 20 assembled with a cable
• FIG. 22 is a cross-sectional view of the embodiment of FIG. 9 showing the ferrule integrated with the anchor block;
• FIG. 23 is a cross-sectional view of the embodiment of FIG. 21 showing the ferrule integrated with the anchor block;
• FIG. 24 is a detailed, exaggerated, cross-sectional view of an ECC installed in a non-conductive anchor block with a protruding ferrule and a recessed center pin;
• FIG. 25 is a detailed, exaggerated, cross-sectional view of an ECC installed in a conductive anchor block with a recessed ferrule and protruding center pin;
• FIG. 26 is bottom view of the cable termination assembly of FIG. 1 with an insulating plate
• FIG. 27 is a detail view of the bottom of the coax cable termination assembly of FIG. 26 taken at E;
• FIG. 28 is a detailed view of FIG. 6 taken at D showing the compliant contacts as skewed coil contacts;
• FIG. 29 is bottom view of the cable termination assembly of FIG. 1 with an insulating plate;
• FIG. 30 is a detail view of the bottom of the coax cable termination assembly of FIG. 29 taken at F;
• FIG. 31 is a detailed view of FIG. 6 taken at D showing the compliant contacts as conductive rubber contacts with an insulating plate;
• FIG. 32 is a cross-sectional view of FIG. 31 taken at G-
• FIG. 33 is a cross-sectional view of FIG. 32 taken at H-
• FIG. 34 is an exploded, cross-sectional, side view of the pogo pin embodiment of the expansion/contraction compensator
• FIG. 35 is a cross-sectional, side view of the embodiment of FIG. 34 assembled with a cable
• FIG. 36 is a cross-sectional, side view of the embodiment of FIG. 34 assembled with a cable and with the pogo pin compressed;
• FIG. 37 is a detailed view of FIG. 6 taken at C with the pogo pin embodiment of the ECC and with skewed coil contacts for the ground contacts;
• FIG. 38 is a detailed view of FIG. 6 taken at C with the pogo pin embodiment of the ECC and with conductive rubber contacts for the ground contacts.
• the present invention is a controlled-impedance cable termination that minimizes the effects of cable expansion and contraction on impedance matching.
• impedance mismatches are minimized, allowing the cable to be more useful in high-frequency signal ranges.
• the present invention can be used with any cable structure where the impedance between the inner conductor (s) and the ground shield is controlled.
• the present invention is for use with controlled- impedance cables having one or more central conductors.
• a coaxial cable 40 has a center conductor 42 surrounded by a dielectric 44 with a ground reference shield 46 outside the dielectric 44.
• a sheath 48 covers the shield 46.
• a twin-axial cable 40 has two center conductors 42 surrounded by a dielectric 44 with a ground reference shield 46 outside the dielectric 44 and a sheath 48 covering the shield 46. Cables with more than two center conductors are available.
• the present invention can be adapted to accommodate cables having two or more center conductors.
• the present invention includes a cable terminator 10 that employs compliant electrical
• the assembly 8 is removably attached to the electrical device 2 by a compression force 24 in a direction of compression 26.
• jack screws 28 provide the compression force 24. Jack screws 28 may not compress the assembly 8 and the electrical device 2 together linearly.
• Compliant contacts 12, 14 facilitate an adequate connection between the cables 30 and the electrical device 2, compensating for noncoplanarities in the conduction points 4 of the electrical device 2.
• the terminator 10 has an anchor block 18 for securing the cables 40, an expansion/contraction compensator (ECC) 16 attached to the end of the cable 40, one or more compliant signal contacts 12 for making the
• the ECC 16 compensates for any expansion and contraction of the center conductor 42 and/or dielectric 44 due to temperature, flexure, or other external factors.
• the first embodiment 60 of the ECC 16 is shown in FIGS. 8 and 9. It is a press-fit embodiment with a partial air dielectric.
• This embodiment 60 has an electrically- conductive, cylindrical ferrule 62 with an axial bore 64.
• the bore 64 has several sections.
• the cable section 66 has a diameter that is adapted to accept a cable 40 with the sheath 48 stripped back, as in FIG. 9.
• the ferrule 62 is attached to the cable shield 46 by soldering, as at 72, crimping, or other mechanical means that electrically couples the ferrule 62 to the shield 46.
• the air section 68 is empty but for air and operates as an extension of the cable dielectric 44. As shown in FIG. 9, the center conductor 42 extends through the air section 68.
• the parameters of the air section 68 primarily the length and diameter, are adjusted to maintain impedance control in a manner known in the art .
• the dielectric section 70 is sized to accept a press-fit, axial-aligned, cylindrical dielectric insert 74 composed of a solid dielectric material.
• the dielectric insert 74 operates as an extension of the cable dielectric 44 and air dielectric in the air section 68.
• the dielectric insert 74 has an axial bore 76 to receive a press-fit, electrically-conductive center pin 78.
• the center pin 78 operates as an extension of the cable center conductor 42.
• the parameters of the dielectric insert 74 and center pin 78 primarily the lengths and several diameters, are adjusted to maintain impedance control in a manner known in the art .
• the center pin 78 has an axial bore 80 with an opening 81 that accepts the cable center conductor 42.
• a coupling 82 provides the electrical connection between the center
• the diameter of the bore 80 is such that the center conductor 42 fits snuggly within the bore 80.
• center conductor 42 When the center conductor 42 expands and/or contracts axially, it slides (reciprocates) within the bore 80.
• the diameter of the bore 80 is larger than that of the center conductor 42 and an annular protrusion or detent 86 extends from the inside of the bore 80.
• the center conductor 42 fits snuggly within the detent 86. When the center conductor 42 expands and/or contracts axially, it slides (reciprocates) within the bore 80. Therefore, the fit within the detent 86 cannot be so snug that the center conductor 42 cannot slide when it expands and contracts.
• the detent 86 can extend continuously around the bore 80 or can be sectioned, as in FIG. 11.
• the bore 80 is sectioned by two or more radial slots 88.
• Two slots 88 are shown in FIGS. 12 and 13.
• the upper end 92 of the sections 90 formed by the slots 88 are pinched together to narrow the opening 94 for the center conductor 42 as compared to the bottom 96 of the bore 80.
• the center conductor 42 fits snuggly within the opening 94.
• the slot 88 provides the opening 94 with more resilience while
• the bore 80 is filled with a conductive epoxy or elastomer 96.
• elastomer 96 electrically connects the center conductor 42 to the center pin 78.
• the resilience of the epoxy or elastomer 96 must be such that it can stretch and compress enough to allow the center conductor 42 to expand and contract.
• the center conductor 42 is inserted into the bore 80 and soldered to the center pin 78. This method can accommodate expansion and contraction of the cable dielectric 44 while forcing any expansion and contraction of the center conductor 42 to occur away from the ECC 16 and toward the other end of the cable 40.
• the present invention contemplates the use of any method that can provide an acceptable electrical connection between the center conductor 42 and the center pin 78 that
• the second embodiment 110 of the ECC 16 is shown in FIGS. 15-17. It is a press-fit embodiment with a completely solid dielectric.
• This embodiment 110 has an electrically- conductive, cylindrical ferrule 112 with an axial bore 114.
• the bore 114 has several sections.
• the ground boss section 116 accepts a ground boss 120.
• the ground boss 120 is a cylinder that has a bore 122 that accepts a cable 40 that has had the sheath 48 stripped back, as in FIG. 16.
• the shield 46 is typically soldered to the ground boss 120, as at 124, but can be attached in any way practical.
• the ground boss 120 can be secured into the ground boss section 116 in whatever manner is desired.
• the ground boss 120 can be press-fit into the ground boss section 116, the ground boss 120 can be threaded and turned into the ground boss section 116, or the ground boss 120 can be secured in the ground boss section 116 by a locking nut.
• the dielectric section 118 is sized to accept a press- fit, axial-aligned, cylindrical, solid dielectric insert 126.
• the dielectric insert 126 operates as an extension of the cable dielectric 44.
• the dielectric insert 126 has an axial bore 128 for a press-fit, electrically-conductive center pin 130.
• the center pin 130 operates as an extension of the cable center conductor 42.
• the parameters of the dielectric insert 126 and center pin 130 primarily the lengths and diameters, are adjusted to maintain impedance control in a manner known in the art .
• the center pin 130 has an axial bore 132 that accepts the cable center conductor 42.
• a coupling 134 provides the electrical connection between the center conductor 42 and the center pin 130 while accommodating expansion and contraction of the cable center conductor 42 and/or cable dielectric 44. Methods of providing the coupling 134 are described above with reference to the partial air dielectric, press-fit embodiment 60 of the ECC 16.
• the third embodiment 150 of the ECC 16 is shown in FIGS. 18 and 19. It is a flanged embodiment with a partial air dielectric.
• This embodiment 150 has an electrically- conductive, cylindrical ferrule 152 with an axial bore 154.
• the bore 154 has several sections.
• the cable section 156 has a diameter that is adapted to accept a cable 40 with the sheath 48 stripped back, as in FIG. 19.
• the shield 46 is soldered to the ferrule 152, as at 162.
• the air section 158 is empty but for air and operates as an extension of the cable dielectric 44. As shown in FIG. 19, the center conductor 42 extends through the air section 158.
• the parameters of the air section 158 primarily the length and diameter, are adjusted to maintain impedance control in a manner known in the art.
• the dielectric section 160 is sized to accept a press- fit, axial-aligned, cylindrical, solid dielectric insert 164.
• the dielectric insert 164 operates as an extension of the cable dielectric 44 and air dielectric in the air section 158.
• the dielectric insert 164 is in two sections, an inner section 168 and an outer section 170, as described below.
• the dielectric insert 164 has an axial bore 166 for a flanged, electrically-conductive center pin 178.
• the center pin 178 operates as an extension of the cable center
• the center pin 178 has an annular flange 180 for capturing the center pin 178 in the dielectric insert 164.
• the dielectric insert inner section 168 is inserted into the axial bore 154.
• the center pin 178 is inserted into the bore 166 of the inner section 168.
• the flange 180 fits into a notch 172 (a larger diameter section of the bore 182) in the inner section 168.
• the dielectric insert outer section 170 is inserted into the axial bore 154 and an annular notch 174 captures the flange 180. Between the flange 180 and the wall of the notches 172, 174 is an air gap 176.
• the parameters of the dielectric insert 164 and center pin 178 primarily the lengths, several diameters, and the size of the notch air gap 176, are adjusted to maintain impedance control in a manner known in the art.
• the center pin 178 has an axial bore 182 that accepts the cable center conductor 42.
• a coupling 184 provides the electrical connection between the center conductor 42 and the center pin 178 while accommodating expansion and contraction of the cable center conductor 42 and/or cable dielectric 44. Methods of providing the coupling 184 are described above with reference to the partial air dielectric, press-fit embodiment 60 of the ECC 16.
• the fourth embodiment 200 of the ECC 16 is shown in FIGS. 20 and 21. It is a press-fit embodiment with a partial air dielectric.
• This embodiment 200 has an electrically- conductive, cylindrical ferrule 202 with an axial bore 204.
• the bore 204 has several sections.
• the cable section 206 has a diameter that is adapted to accept a ground boss 212.
• the cable 40 with the sheath 48 stripped back is inserted into an axial bore 214 in the ground boss 212, as in FIG. 21.
• the ground boss bore 214 may have a consistent diameter or the ground boss bore 214 may have a counter bore with a larger upper diameter, as at 216.
• the diametric change would act as an assembly stop for the assembler to know more precisely when the cable is tightly seated to the bottom of the ground boss 212.
• the lower portion 217 of the ground boss bore 214 is sized to have the cable ground shield 46 fixed and
• the ground boss 212 is inserted into the ferrule bore 204 and is secured by a locking nut 222, press fit, soldered, held in-place with an ID circlip, or other appropriate mechanism.
• the locking nut 222 has external threads that turn into internal threads in the cable section 206 of the ferrule bore 204.
• the ground boss 212 has an annular
• the cable 40 extends through a bore 224 in the locking nut 222.
• the impedance control section 208 holds an impedance control boss 226.
• the impedance control boss 226 is a ring with an axial bore 228.
• the impedance control boss 226 is installed into the impedance control section 208 such that it makes electrical contact with the ground boss 212 and the ferrule 202, thereby operating to electrically connect the ground boss 212 to the ferrule 202.
• the center conductor 42 extends through the impedance control boss bore 228.
• the dielectric section 210 accepts an electrically- conductive center pin 240.
• the center pin 240 is secured in the dielectric section 210 by a solid dielectric centering ring 232 that is press-fit into the dielectric section 210.
• the dielectric centering ring 232 is made with a feature such as a slice parallel to the axis which allows it to expanded over capture features in the center pin 240.
• the center pin 240 fits in and is held by a bore 234 in the dielectric centering ring 232.
• the dielectric centering ring 232 has a thickness that is as small as practical in order to minimize its effect on the system.
• the purpose of the dielectric centering ring 232 is to securely maintain the position of the center pin 240. To that end, the thickness of the dielectric centering ring 232 must be large enough to prevent rocking of the center pin 240 in the centering ring bore 234.
• the air space 230 operates as an extension of the cable dielectric 44.
• the parameters of the air space 230 primarily the length and diameter, are adjusted to maintain impedance control in a manner known in the art.
• a cylindrical air space 238 that operates as an extension of the cable dielectric 44.
• the parameters of the air space 238, primarily the length and diameter, are adjusted to maintain impedance control in a manner known in the art .
• the center pin 240 has an axial bore 242 that accepts the cable center conductor 42.
• a coupling 244 provides the electrical connection between the center conductor 42 and the center pin 240 while accommodating expansion and contraction of the cable center conductor 42 and/or cable dielectric 44. Methods of providing the coupling 184 are described above with reference to the partial air dielectric, press-fit embodiment 60 of the ECC 16.
• the ECC 16 is installed on the cable 40 and in a cable through hole 32 in the anchor block 18.
• ECC can be permanently installed in the block cable through hole 32 or is designed to be removable.
• An opening 36 in the face 34 of the anchor block 18 provides access to the ECC 16 for the compliant contacts 12, 14.
• the anchor block 18 is made from an insulating material and the ground contacts 14 alone couple the cable shield 46 via the ECC ferrule 38 to the ground plane of the device 2.
• the ECC ferrule 38 will typically be thicker for a better connection with the ground contacts 14.
• a single ground contact 14 that may be shared between two cables 40 will typically become two ground contacts 14, one for each cable 40.
• the anchor block 18 is conductive to provide a common ground for the shields 46 of more than one cable 40.
• the optional ground contacts 14 make the electrical connection between the anchor block 18 and the ground plane of the device 2.
• the ferrule may not be an independent component, but is integrated with the anchor block 18.
• the ferrule bore 190 is formed directly in the anchor block 18. This structure only works when the anchor block 18 is electrically conductive.
• FIG. 22 shows the partial air dielectric embodiment 60 of FIGS. 8 and 9 with the ferrule as part of the anchor block 18.
• the cable shield 46 is attached directly to the anchor block 18, as at 188.
• FIG. 23 shows the air dielectric embodiment 200 of FIGS. 20 and 21 with the ferrule as part of the anchor block 18.
• the shield 46 is attached to the ground boss 192, as at 194.
• the ground boss 192 is inserted into the ferrule (anchor block) bore 190 and secured, as described above with
• ferrule bore is used to describe the bore 190 into which the dielectric 196 is installed, whether it is in the anchor block 18 or in a ferrule 36 installed in the anchor block 18.
• the ECC 16 will be relatively flush with the anchor block face 34.
• the ECC 16 may not be exactly flush with the anchor block face 34, that is, it may be slightly recessed into or protruding from the anchor block face 34. That recession or protrusion can be as much as 0.050 inch (50 mils) .
• the present invention considers that such variability to be flush .
• the face 294 of the center pin 292 is generally planar with the ground plane 296. If the anchor block 18 is non-conductive, the ground plane 296 is the face 288 of the ferrule 286. If the anchor block 18 is conductive, the ground plane 296 can either be the ferrule face 288 or the anchor block face 34, and the location of the ground contact 14 determines which is the ground plane 296. If the ground contact 14 is in
• the center pin face 294 is planar with the ground plane 296. Due to tolerances in the materials and manufacturing process, the center pin 294 will most likely not be exactly planar with the ground place 296.
• the present invention contemplates that the largest displacement 298 between the center pin face 294 and the ground plane 296 is ⁇ 0.050 inches (50 mils) . The present inventions considers up to this amount of
• the various components are composed of materials well-known in the art.
• the ferrule and center pin are composed of standard conductive materials.
• the components can be composed of any appropriate dielectric material.
• the dielectric material has a
• Example materials include Polytetrafluoroethylene (PTFE) , aerated PTFE (PTFE mixed with air during extrusion), and polyetherimide (PEI) .
• PTFE Polytetrafluoroethylene
• PEI polyetherimide
• the dielectric constant of the components can be reduced by boring holes into the component so that a significant portion of the component is air, while retaining the component's integrity .
• the plate 20 holds the compliant contacts 12, 14.
• the structure of the plate 20 depends on the type of contact. Regardless of the type of contact, the plate 20 has several common features. These features are shown in FIG. 28 with reference to the skewed coil contact, but apply to all types of contacts.
• the plate 20 has an anchor block face surface 364 that abuts the anchor block face 34 when the terminator 10 is assembled.
• the plate 20 has a device surface 366 that generally abuts the device 2 when the terminator 10 is connected to the device 2.
• the plate 20 has at least one through aperture 352 for the contacts 12, 14.
• the apertures 352 are either signal apertures or ground apertures, depending on the type of signal that is carried in the contact in that aperture 352.
• Each aperture 352 has an anchor block face opening 354b and a device face opening 354a.
• the signal apertures for the signal contacts 12 are aligned with the corresponding center pin face 84 in the anchor block 18.
• the anchor block contact point 360 Prior to assembling the plate 20 to the anchor block 20, the anchor block contact point 360 extends from the anchor block face opening 354b.
• the device contact point 362 Prior to connecting the terminator 10 to the device 2, the device contact point 362 extends from the device face opening 354a.
• the plate 20 can be either insulating or conductive.
• the insulating plate is made of a non-electrically-conductive material, preferably a plastic, so as to not electrically couple the signal contacts 12 and ground contacts 14.
• a conductive plate is preferably composed of an electrically- conductive metal. The conductive plate electrically couples the ground contacts 14, thus providing more precise impedance matching to the signal contact 12.
• the signal contact 12 is insulated from the conductive plate by an insulating
• FIGS. 26-28 show the skewed coil compliant contacts 12, 14 with the bottom portion of the ECC of FIGS. 15-17.
• the skewed coil contact 350 is captured in the through aperture 352.
• the aperture 352 has a larger center section 356 that narrows to a smaller anchor block opening 354b at the side adjacent to the anchor block 18 and to a smaller device opening 354a at the other end.
• the plate 20 has two mirror image sheets 358 where each sheet 358 has one opening 354a, 354b and a half of the center section 352. Alternatively, the plate 20 has two asymmetrical sheets, one with the full center section 356 and one of the openings 354a, 354b.
• the contact 350 is placed in the center section 352 of one sheet 358 and the sheets 358 are sandwiched together to capture the contact 350.
• the length of the contact leads 360, 362 is such that the leads 360, 362 extend from the openings 354a, 354b.
• FIGS. 29-33 show the conductive rubber compliant contacts 12, 14 with the bottom portion of the ECC of FIGS. 15-17.
• the conductive rubber contact 250 for the signal contact 12 can be cylindrical with a centrally-located annular
• the non-conductive plate 20 has a through aperture 258 with a centrally-located annular protrusion 260.
• the rubber contact 250 is radially compressed and placed in the aperture 258 such that the protrusion 260 fits into the depression 256 to retain the contact 250 in the aperture.
• the length of the contact 250 is such that the ends 262 extend from the plate 20.
• the conductive rubber contact for the ground contact 14 can be of the same structure as the signal contact 12.
• the conductive rubber contact 266 for the ground contact 14 is circular, surrounding the signal contact 12, as in FIGS. 29, 30, and 32.
• the conductive rubber contact 266 has a circular top sheet 268 adjacent to the anchor block 18 and a circular bottom sheet 270 for
• the two sheets 268, 270 are electrically connected by a plurality of plugs 272 in through apertures 274 in the plate 20.
• the number of plugs 274 can vary by application and is typically four or eight spaced evenly around the signal contact 250.
• each plug 272 has an annular depression 276 that fits into an annular protrusion 278 for retention.
• Knobs 280 extending from the sheets 268, 270 into depressions 282 in the plate 20, as in FIG. 33, help retain the sheets 268, 270 in position.
• Skewed coil and conductive rubber contacts are only two forms of compliant contacts contemplated by the present invention. Other forms of compliant contacts and the
• the present invention also contemplates that the signal contact 12 is an element of the ECC 16.
• An embodiment of such a design 300 is shown in FIGS. 31-34, where the signal contact is a pogo pin that is an element of the ECC. It is a press-fit embodiment with a partial air dielectric, similar to the embodiment of FIGS. 8 and 9.
• This embodiment 300 has a cylindrical ferrule 302 with an axial bore 304.
• the bore 304 has several sections.
• the cable section 306 has a diameter that is adapted to accept a cable 40 with the sheath 48 stripped back, as in FIG. 32.
• the shield 46 is soldered to the ferrule 302, as at 312.
• the air section 308 is empty but for air and operates as an extension of the cable dielectric 44. As shown in FIG. 34, the center conductor 42 extends through the air section 308. The parameters of the air section 308, primarily the length and diameter, are adjusted to maintain impedance control in a manner known in the art.
• the dielectric section 310 is sized to accept a press- fit, axial-aligned, cylindrical dielectric 314.
• dielectric 314 operates as an extension of the cable
• the dielectric 314 has an axial bore 316 for a press-fit center pin 318.
• the center pin 318 operates as an extension of the cable center conductor 42.
• the parameters of the dielectric 314 and center pin 318 primarily the lengths and several diameters, are adjusted to maintain impedance control in a manner known in the art .
• the center pin 318 has an axial bore 320.
• the cable section 324 of the bore 320 accepts the cable center
• a coupling 322 provides the electrical connection between the center conductor 42 and the center pin 318 while accommodating expansion and contraction of the cable center conductor 42 and/or cable dielectric 44. Methods of providing the coupling 322 are described above with reference to the partial air dielectric, press-fit embodiment 60 of the ECC 16.
• the spring section 326 of the bore 320 holds a coil spring 328.
• a pogo pin 330 in the spring section 326 extends from an opening 336 at the bottom of the bore 320.
• An annular ridge 334 is captured by a shoulder 332 formed by making the opening 336 smaller than the diameter of the spring section 326.
• the pogo pin 330 can push into the bore 320, compressing the spring 328, until the head 338 of the pogo pin 330 contacts the face 340 of the center pin 318, as in FIG. 33.
• FIGS. 34-36 show the pogo pin incorporated into the ECC embodiment of FIGS. 8 and 9, the present invention contemplates that the pogo pin can be incorporated into any embodiment of the ECC 16.
• FIG. 37 shows the pogo pin ECC with skewed coil compliant ground contacts 14.
• the ground contacts 14 surround an opening 344 in the plate 20.
• the pogo pin 230 extends through the opening 344 and the remainder of the opening 344 is air.
• the air portion acts as an extension of the cable dielectric 44 to the device 2 and is adjusted to maintain impedance control in a manner known in the art.
• FIG. 38 shows the pogo pin ECC with a conductive rubber compliant ground contact 14.
• the conductive rubber contact for the ground contact 14 can be of the same structure as the signal contact 12 described above with reference to FIG. 31.
• the conductive rubber contact 14 for the ground contact 14 is circular, as described above with reference to FIGS. 29-33.
• the ground contact (s) 14 surround an opening 346 in the plate 20. The diameter of the opening 346 is adjusted to maintain impedance control in a manner known in art.
• the pogo pin 230 extends through the opening 346 and the remainder of the opening 346 is air. The air portion acts as an extension of the cable dielectric 44 to the device 2.

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• Details Of Connecting Devices For Male And Female Coupling (AREA)
• Coupling Device And Connection With Printed Circuit (AREA)

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• 2015
  • 2015-04-14 WO PCT/US2015/025743 patent/WO2015160802A1/en active Application Filing
  • 2015-04-14 EP EP15780523.5A patent/EP3132509B1/de active Active

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