Electrical connectors

Abstract: An electrical connector assembly including a pair of mating connectors (11, 12) and arranged for high velocity propagation of electrical signals along a plurality of paths between first circuit means connected to one connector and second circuit means connected to the other connector, each connector comprising: signal contact elements (25-28; 31-39) associated with said mating connectors for propagation of said signals, said contact elements having connection means at one end thereof for selectively making connection to said first circuit or second circuit means and having a contact surface at an opposite end thereof for engagement with a contact surface of a contact element of the mating connector, ground plate means (17, 18) having connector means along one edge thereof for selectively making connection to a terminal of said first circuit means and having contact surface means along an opposite edge thereof for engagement with contact surface means of the ground plate means of a mating connector, and support means for supporting said contact elements in fixed and electrically insulated relation to each other and to said ground plate means, and contact elements including a group of elements, said contact element being associated with said ground plate means and being supported in at least one row in logitudinally spaced parallel relation to its associated ground plate means.

Description: This invention relates to electrical connectors and more particularly to electrical connectors which are usable for propagation of a relatively large number of signals between electrical circuits and at very high velocities and which are also usable to transmit supply and/or other voltages between such electrical circuits. The number of signals which can be propagated is quite large in relation to the size of the connectors of the invention and at the same time, the signals can be transmitted at very high velocity and with minimal interference between the signals propagated or from external signal sources. The connectors are also advantageous in that the electrical characteristics of the propagation paths are uniform and they can be readily matched to the characteristics of the circuits which are interconnected so as to minimize standing wave phenomena. The invention also facilitates connection to a plurality of circuit boards while providing substantially complete separation of signals propagated to and from their circuits and while also providing connection between such circuits for transmission of supply and/or other voltages there between. Conventional types of connectors have been used heretofore for connection of circuits of mother boards and daughter boards, in computer equipment or in similar applications, and they have generally been highly reliable in operation. However, there have been problems and in the last few years they have been of increasing magnitude, especially when contact spacings are reduced to reduce the sizes of connectors and/or to increase the number of contacts or when the interconnected circuits are designed to use advances in technology which make it possible to transmit large volumes of data at high speeds. Such problems have included loss of transmitted signals, interference between signals or "cross-talk" and interference from extraneous signals. The existence of such increasing problems have been generally recognized but satisfactory solutions have not been apparent. Connectors of this type are known from e.g. GB-A-2 163 305 and FR-A-2 550 894. This invention was evolved with the general object of providing electrical connectors which will reliably propagate large numbers of signals between circuits at very high velocities while at the same time being of relatively small size and being readily and economically manufactured. A specific object of the invention is to provide connectors which are also operable to transmit supply, reference or control voltages without interference with the propagation of high velocity signals and without increasing the size of the connector or cost of manufacture thereof. As hereinafter discussed, the connectors are usable advantageously to transmit supply, reference or control voltages. A connector is disclosed in this application which provides additional capabilities and advantages with respect to transmission of such voltages, while retaining all of the features and advantages of the invention as previously disclosed. As disclosed in our aforementioned application, important aspects of the invention relate to the discovery and recognition of problems with prior connector constructions. It has been found that ground connections tend to develop electrostatic charges when attempts are made to propagate high volumes of pulse signals at very high speeds as when employing VHSIC or very high speed integrated circuits. A shift in voltage between ground planes of two interconnected circuits may result in loss of reference levels in electronic circuitry, thus rendering computers and the like inoperative. Mismatched impedances between circuitry and connectors causes reflections and the production of undesirable standing wave phenomena, with corresponding errors in transmitting data, in the case of transmitting digital signals. It is also found that cross talk between signal paths increases with frequency and with decreases in the spacing therebetween. This problem is affected to a substantial extent by the characteristics of the ground connection which is common to the two signal propagation paths. Inductive reactances for a given path length increase with frequency and if the ground connection has a substantial reactance, it can cause problems with high frequency signal propagation or high velocity pulse signal propagation. This fact has not been generally recognized because the ground paths of conventional connectors have inductive reactances which have not produced a problem when transmitting signals at relatively low frequencies. Typically, one or more connector pins have been used in the past for ground connections and, in some cases, each pin used for signal transmission may have an associated adjacent pin used for a ground connection, in an attempt to minimize cross talk problems. It is found that this does not provide an adequate solution because there may nevertheless be substantial impedances in the ground connections and also, this solution requires many more connector pins. Moreover, if the number of ground pins were increased so as to use two or more pins for each signal pin, it would impose severe space limitations as well as increasing insertion forces. Another problem with prior constructions relates to the impedance characteristics of the signal paths. Each signal path of an electrical connector may be considered as an electrical transmission line having a certain characteristic impedance determined by its resistance, inductance, and distributed capacitance per unit length. At relatively low signal transmission velocities, the actual impedance of the path is not usually more important. However, at high velocities, the path may produce reflections, resonances and standing wave phenomena when there is a substantial mismatch between the characteristic impedance of the path and the characteristic impedances of the circuits connected thereto. It is also to be observed that it is especially desirable that the characteristic impedances of all paths be substantially the same, so as to facilitate design of the connected circuits. Accordingly, the invention provides an assembly as defined in Claim 1 below. An electrical connector assembly constructed in accordance with the invention may include a pair of mating connectors, each including a plurality of contact elements and each having at least one ground plate with electrically insulating material supporting the contact elements and each ground plate within an outer shell. In an embodiment of the invention there are two longitudinally spaced ground plates in each connector. Such ground plates need not be directly connected together electrically to each other or to the outer shell and they may be used with each other and/or with the outer shell for transmission of DC supply voltages, reference voltages or on-off control voltages or for other purposes. It is desirable, however, that there be a very low AC impedance between each ground plate and each other ground plate and between each ground plate and the outer shell so as to effectively provide a single ground for high velocity signal transmission. Each ground plate of each connector has means along one edge thereof for connection to a mating edge portion of a mating ground plate of the other connector, opposite edges of the mating ground plates being arranged for connection to circuit means. For example, one connector may be mounted in a mother board and the other connector may be mounted in a daughter board with each ground plate being connected to a ground terminal of a circuit board of the daughter board. In an illustrated embodiment of the invention, the daughter board includes two circuit boards with ground terminals in facing relation engaged with connector means of a ground plate of the daughter board connector. In an embodiment of the invention as illustrated herein, each of a pair of mating connectors includes two longitudinally spaced sections and each such section includes several ground plates in longitudinally spaced relation but with a close spacing in a longitudinal direction between adjacent edges thereof, such ground plates being operable to provide in effect a single continuous ground plate in spaced relation to the contact elements used for transmission of high velocity signals. At the same time, such ground plates of each section may be used advantageously for a variety of purposes including transmission of DC supply voltages, e.g. 5 volt and plus and minus 12 volt supply voltages. They may also or alternatively be used for transmission of reference or control voltages. It is not necessary to use contact elements for transmission of such voltages. All of contact elements are usable for transmission of high velocity signals and all of the features and advantages disclosed in our aforesaid application are obtained. In particular, in all embodiments of the invention, the contact elements of each connector may include a group of elements which are associated with each ground plate and which are supported in a row in longitudinally spaced parallel relation in a first plane with the associated ground plate being supported in a second plane parallel to the first plane and extending longitudinally for substantially the full length of the row of contact elements associated therewith. With this arrangement, a sheet ground is provided of very low inductance and resistance which provides a very low impedance and which prevents the build-up of any potential difference between the interconnected circuits. The result is a very substantial increase in the speed and volume of data transmission which can be accommodated in a connector of a given size. The arrangement also minimizes ground path impedances and cross-talk effects between adjacent signal paths. Each ground plate may be disposed between separate groups of contact elements which are respectively connected to separate circuit means such as circuits on the opposite side of a printed circuit board or on opposite faces of a pair of separate circuit boards. With this feature, it is possible to obtain substantially complete isolation which is a most important consideration in a great many applications. As also disclosed in our aforesaid application, additional important features relate to the attainment of uniform characteristic impedance. The contact elements of each row are preferably at the same distance from the adjacent surface of the ground plate associated therewith. A second row of contact elements may be provided at a greater distance from the ground plate and at a closer distance to the wall of a shell, the distance from the second row to the shell being equal to the distance from the first row to the ground plate with the result being that all contact elements have substantially the same impedance characteristics when the shell and ground planes are electrically connected. In this arrangement, the contact elements may be arranged in staggered relationship and the overall result is a much higher contact density while at the same time minimizing cross-talk. By minimizing the length of signal paths and the distance between the ground plane and the outer shell which surrounds the signal paths, this construction reduces interference from extraneous signals as well as increasing the velocity of signal propagation through the connector. This invention contemplates other objects, features and advantages which will become more fully apparent from the following detailed description taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a transverse sectional view of a pair of mated connectors constructed in accordance with the principals of this invention, the lower connector of Figure 1 being a receptacle and the upper connector being a plug and being shown connected to a circuit board assembly; Figure 2 is a plan view of the receptacle connector of Figure 1, on a reduced scale and with intermediate portions broken away; Figure 3 is a side elevational view of the receptacle connector of Figure 2; Figure 4 is a sectional view of the receptacle connector, on a scale larger than that of Figure 2 but smaller than that of Figure 1, particularly showing the relationship of engagement fingers or tines of the connector; Figure 5 is a fragmentary perspective view of a ground plate of the receptacle connector; Figure 6 is a side elevational view of the plug connector of Figure 1 but on a reduced scale; Figure 7 is a plan view of the plug connector as shown in Figure 6; Figure 8 is a fragmentary view of a portion of a ground plate of the plug connector; Figure 9 is a view illustrating a modified ground plate for the plug connector; Figure 10 is a view illustrating another modified ground plate for the plug connector; and Figure 11 is a cross sectional view taken substantially along line XI-XI of Figure 1. DESCRIPTION OF A PREFERRED EMBODIMENT Reference numeral 10 generally designates a connector assembly constructed in accordance with the principles of this invention. The illustrated assembly 10 includes mating connectors 11 and 12. The connector 11, as shown, is adapted to be mounted on and form part of a mother board and the connector 12 is adapted to received and to be secured to a circuit board assembly 14 to form a daughter board. It will be understood that the connectors 11 and 12, and the novel features thereof which form part of the invention, may be used in other configurations and for other purposes. The connector 11 as shown includes an outer shell 15 which receives an outer shell 16 of the connector 12, the connector 11 being thus in the form of a receptacle and the connector 12 being thus in the form of a plug. It will be understood, of course, that the invention is not limited to this relationship and, for example, the connector 11 might be in the form of a plug while the connector 12 might be in the form of a receptacle. Shells 15 and 16 are preferably of a highly conductive metal such as aluminum and are preferably connected electrically to each other and to electric grounds of the interconnected circuits. In accordance with the invention, the connectors 11 and 12 include central plates which are generally designated by reference numerals 17 and 18 and connected to the electrical grounds of interconnected circuits plates 17 and 18 together define a central planar ground extending along the length of the connector, in a direction normal to the plane of the paper in Figure 1. As hereinafter discussed in connection with Figure 11, each of the plates 17 and 18 may be in the form of a plurality of separate plate sections usable for transmission of DC supply or other voltages but with a low AC impedance between such separate plates, they provide a very low impedance ground connection and act as an electrical separation and shield between contacts on opposite sides thereof. Plate 17 is sandwiched between a pair of members 19 and 20 of insulating material which are secured in the shell 15 of connector 11 and plate 18 is sandwiched between a pair of members 21 and 22 of insulating material which are secured within the shell 16 of connector 12. In the illustrated embodiment, the connector 11 includes contacts in four groups, contacts 25 of the first group being located relatively close to the ground plate 17 and being supported by the member 19, contacts 26 being spaced further from the ground plate 17 and being also supported by the member 19, contacts 27 being supported by the member 20 on the opposite side of the ground plate and relatively close to the ground plate 17 and contacts 28, also supported by the member 20 and being spaced further away from the ground plate 17. As shown in Figure 2, the contacts 25 and 26 are in staggered relationship to each other and the contacts 27 and 28 are similarly in staggered relation to each other. As also shown in Figure 2, the shell 11 may have an intermediate wall portion 29, separating the connector into two sections with there being two longitudinally spaced ground plates 17 and associated groups of contacts 25-28. Each of such plates 17 and each of the two mating plates 18 may be in the form of a plurality of separate plate sections, as hereinafter discussed in connection with Figure 11. Each connector may have a large number of contacts and, by way of example, each section may have 120 contacts with a total of 240 contacts for the two sections, the spacing of contacts being typically 1.9 mm (0.075 inches) and the overall length of the connector being on the order of 12.7 cm (5 inches). With a contact spacing of 1.27 mm (0.05 inches), a total of 352 contacts may be provided. It should be understood, of course, that the connectors need not be separated into two sections as illustrated in Figure 2 and, of course, any appropriate contact spacing may be used. It is, however, an important feature of the invention that a relatively large number of contacts may be provided in a compact connector with relatively close spacing of contacts, while avoiding the problems which would be encountered with such contact spacings when using prior art constructions. As shown in Figure 7, the plug connector 12 has contacts 31, 32, 33 and 34 adapted to mate with the contacts 25, 26, 27 and 28, respectively. Contacts 31 and 32 are supported by the insulating member 21 on one side of the ground plate 18 while contacts 33 and 34 are supported by the insulating member 22 on the opposite side of the insulating member. All contacts have the same spatial relationship to the associated grounded high conductively planar ground plate and shell surfaces so that all signal transmission paths have substantially the same characteristic impedance. As best shown in Figure 1, each of the contacts 25 has a hollow end portion 25 a which projects from a surface 19 a of the member 19 and which extends into an opening 21 a in the member 21 to receive a projecting portion 31 a of the contact 31, indicated in dotted lines. Each of the other contacts of connector 11 has a configuration like that of the contact 25 and each of the other contacts of connector 12 has a configuration like that of the contact 31. Thus in the illustrated arrangement, each contact 25 is a female contact and each contact 31 is a male contact but it will be understood that the contacts may be reversed and that, in any case, the invention is not limited to any particular form or relationship of the mating signal contacts. The construction of the ground plate 17 is illustrated in Figure 5. It is preferably of a copper alloy which may be approximately 0.15 mm (0.006 inches) thick with a 0.00127 mm (0.00005 inch) gold plate for maximum conductivity and it is formed with projecting fingers or tines 17 a and 17 b as shown, having terminal end portions 17 c and 17 d bent in opposite directions from a central plane of the plate 17 and having portions 17 e and 17 f for pressure engagement with an edge portion of the plate 18 when the connectors are assembled. The relationship of the tines 17 a and 17 b before assembly, is illustrated in Figure 4. In assembly, the tines 17 a and 17 b move into recesses 22 b and 21 b respectively, of the insulating members 22 and 21. In the normal mating sequence, the end of the shell 16 moves into the shell 15, then the edge of the plate 18 moves between the terminal ends 17 c and 17 d of the tines 17 a and 17 b and then the ends of the contacts 31-34 move into the sockets defined by the hollow ends of the contacts 25-28. With this mating sequence, the ground connection is made before the signal connection and any electrostatic build-up is discharged before engagement of signal contacts. This protects electronic devices from damage during handling and repair. The construction of the plate 18 is shown in Figures 1 and 8. It is preferably of a copper alloy which may be approximately 0.15 mm (0.006 inches) thick, with a 0.00127 mm (0.00005 inch) gold plate for increased conductivity and, for connection to the circuit board assembly, it has one edge rolled to form an open generally tubular portion 18 a . The portion 18 a engages ground terminals which extend in facing relation on the surfaces 37 and 38 of two circuit boards 39 and 40 which form the circuit board assembly 14. In the illustrated arrangement, a thick metal plate 41 is disposed between the circuit boards 39 and 40 to form a heat sink. The circuit boards 39 and 40 are so formed as to provide terminals which engage extensions 31 a , 32 a , 33 a and 34 a of the contact elements 31, 32, 33 and 34, such extensions extending outwardly and then inwardly and then outwardly, as shown, to provide contact surfaces for contact with terminals on the outwardly facing sides of the circuits boards 39 and 40. The extensions 31 a , 32 a , 33 a and 34 a and also the portion 18 a of ground plate 18 may be tinned before assembly and soldered to the respective terminals after assembly, or other bonding operations may be performed, if desired. Figure 9 illustrates a modified ground plate 42 usable in place of the ground plate 18 and having a plurality of fingers or tines along its length, alternate tines 42 a being bent outwardly in one direction and the remaining tines being bent outwardly in the opposite direction, for engagement with ground terminals of the printed circuit boards 39 and 40. Figure 10 shows a modified ground plate 44 which has tines 44 a and 44 b formed to engage ground terminals 45 and 46 on the outside surfaces of the printed wiring boards 39 and 40 of assembly 14. As shown in Figure 11, the ground plate 17 of one section of the illustrated connector 11 is formed by four separate plate sections 17A, 17B, 17C and 17D which are in longitudinally spaced relation but with close spacings therebetween preferably less than the distance between contacts. The ground plate 18 of the corresponding section of the connector 12 is formed by four separate plate sections 18A, 18B, 18C and 18D also in longitudinally spaced relation but with close spacings therebetween. The AC impedances between the plate sections 17A-17D and between the plate sections 18A-18D is desirably very low so that at high frequencies, plate sections 17A-17D and plate sections 18A-18D effectively form one ground plate when connected. However, they are usable advantageously for transmission of supply, reference or control voltages. For example, as diagrammatically illustrated in Figure 11, plate sections 17A, 17B, 17C and 17D of the mother board connector 11 may be respectively connected to + 12 volt, + 5 volt, common and -5 volts, terminals 51, 52, 53 and 54 of a DC power supply 56 and plate sections 18A, 18B, 18C and 18D of the daughter board connector 12 may be respectively connected to power input terminals57-60 of an "A" circuit 62 of the daughter board and power input terminals 63-66 of a "B" circuit 68 of the daughter board, the "A" and "B" circuits being on the circuit boards 39 and 40 of the illustrated embodiment and being connected to the signal contacts 31 and 32 on one side of the control ground plane and signal contacts 33 and 34 on the opposite side of the ground plane. As also shown, signal contacts 25 and 26 and signal contacts 27 and 28 of the mother board connector 11 may be connected to "C" and "D" signal circuits 69 and 70, respectively, circuits 69 and 70 having terminals 71-74 and terminals 75-78 connected to terminals 51-54 of power supply 56. It will be understood that the power supply 56 will provide low high frequency impedances to signal ground at terminals 51-54 and also that the "A" and "B" circuits 62 and 68 may include capacitors providing low high frequency impedances between signal ground and terminals 57-60 and terminals 63-66. The plates of the second connector sections, on the other side of the intermediate wall portion 29, may be divided into separate plate sections like sections 17A-17D and 18A-18D, but it is noted that in some applications, two ground plates or two ground plates and a shell, as provided in embodiment disclosed in our aforesaid application, may be all that it needed for voltage transmission. It will be understood that the invention is not limited to use of the ground plates for transmission of DC supply voltages but such ground plates may be used for transmission of DC reference voltages and on-off control voltages. They may also be used for transmission of low frequency AC power supply, reference or control voltages and as many plates or plate sections may be provided as are desired or required for any particular application. Thus, it is not necessary to use contacts for such purposes and all contacts are available for use in propagating high frequency signals. Moreover, uniform impedance characteristics are obtained between all contact and the ground provided by the ground plates and outer shell. It will be understood that the invention is not limited to use with a dual circuit arrangement as shown. It is advantageous in any application in which providing an adequate ground is a problem and is particularly advantageous in applications in which separation or isolation of circuits is desirable.

Claims: An electrical connector assembly for transmission of electrical signals between very high speed integrated circuits of first and second circuit means (62,68; 69,70), said connector assembly comprising first and second ground means (15,16; 17,18) of very low impedance and arranged to be electrically connected to ground terminals of said first and second circuit means, said first and second ground means being each generally planar and being arranged in spaced apart parallel relation to each other, a plurality of signal contact elements (25,31; 26,32; 27,33; 28,34) arranged in spaced apart parallel relation to each other and arranged in a plane which is generally parallel to and positioned between the first and second ground means (15,16; 17,18), each of said contact elements (25-28, 31-34) having a generally uniform spatial relationship relative to said ground means and defining respective signal propagation paths having characteristic impedances which are a function of the inductance and capacitance between the elements and the ground means, connection means for selectively electrically connecting the signal contact elements (25-28, 31-34) to said first and second circuit means (62,68; 69,70), an electrically insulating support material (19,20,21,22) supporting the signal contact elements in fixed, electrically insulated spaced relation to each other and to said first and second ground means (15,16; 17,18), said signal contact elements each having the same spatial relationship to said ground means whereby the impedance characteristics for each signal propagation path is substantially the same, and the low impedance ground means (15,16; 17,18) prevents build up of a substantial potential difference between the grounds of the first and second circuit means (62,68; 69,70). An electrical connector assembly as claimed in Claim 1, wherein the connection means provides a direct contact of one end of each of said signal contact elements (31-34) with a contact surface of a conductor connected to said first circuit means (62,68) and a conductive connection between an opposite end of each of said contact elements (25-28) and said second circuit means (69,70). An electrical connector assembly as claimed in Claim 1 or 2, wherein said plurality of signal contact elements include elements (25,31; 26,32) arranged in first and second rows in first and second contact element planes between and in generally parallel relation to said first and second ground means (15,16; 17,18) and with a symmetrical relationship to said ground means such as to provide said impedance which is the same for all of said plurality of signal propagation paths. An electrical connector assembly as claimed in Claim 3, wherein the spacing between said first contact element plane (26,32) and said first ground means (15,16) with the insulating material (19,21) therebetween is the same as the spacing between said second contact element plane (25,31) and said second ground means (17,18) with the insulating material (21,19) therebetween. An electrical connector assembly as claimed in Claim 3 or 4, wherein said contact elements (25,31; 26,32) of said first and second rows are arranged in a staggered relationship such that each signal contact element (26,32) of said first row is midway between positions which are opposite a pair of adjacent elements (25,31) of said second row with the distance between said first and second planes being less than the distance between each contact element of said first row and adjacent contact elements of said second row. An electrical connector assembly as claimed in any one of Claims 1 to 5, comprising a third ground means, said third ground means (15,16) being electrically connected to ground terminals of said first and second circuit means (62,68; 69,70) and being generally planar and parallel to said first and second ground means (15,16; 17,18), said second ground means (17,18) being positioned between said first and third ground means (15,16), a second plurality of said signal contact elements (27,28,33,34) being arranged between said second and third ground means in spaced apart parallel relation to each other and arranged in a plane which is generally parallel to the second and third ground means. An electrical connector assembly as claimed in Claim 6, wherein said connector assembly includes an outer metal shell (15,16) having a pair of spaced parallel opposite wall portions, said first and third ground means being formed by said wall portions. An electrical connector assembly as claimed in claim 7, wherein said second ground means (17,18) comprises at least one metal plate positioned mid-way between said opposite wall portions of said shell (15,16). An electrical connector assembly as claimed in Claim 8, wherein said second ground means comprises a plurality of metal plates (17a,18a; 17b,18b; 17c,18c; 17d,18d) positioned mid-way between said opposite wall portions of said shell (15,16). An electrical connector assembly according to Claim 1 for high velocity propagation of electrical signals along a plurality of paths between very high speed integrated circuits of first and second circuit means, each of the signal contact elements (25-28, 31-34) being elongate and having means at each end for electrically connecting to respective ones of said circuit means (62,68,69,70), said signal contact elements being arranged in rows which extend parallel to one another, and the ground means being planar ground plate members (15,16,17,18) oriented with their plates parallel to said signal contact elements and said rows and including external ground plate members (15,16) disposed along the outer sides of said insulating support material (19,20,21,22), each of said signal contact elements (25-28, 31-34) having a spatial relationship to said ground plate members (15,16; 17,18) which is generally uniform along the length of the signal contact element (25,31; 26,32; 27,33; 28,34) and said signal contact elements being symmetrically disposed in said insulating support material (19,20,21,22) relative to said ground plate members (15,16,17,18) whereby each of said signal contact elements provides a conductive path through said connector having substantially the same impedance as every other of said signal contact elements. An electrical connector assembly according to Claim 1 for high velocity propagation of electrical signals along a plurality of paths between the first circuit means (62,68) connected to one side of the assembly and the second circuit means (69,70) connected to a second, opposite, side of the assembly, said assembly comprising a support means (11,12), a plurality of spaced apart generally parallel connecting elements (25-28, 31-34) constituting the said signal contact elements for propagation of respective signals between the first circuit means on one side of the assembly and the second circuit means on the second, opposite side of the assembly, the ground means (15,16; 17,18) being included in said support means and connectable to ground terminals of said first and second circuit means, and the electrically insulating support (19,20,21,22) supporting said connecting elements in spaced array with each element being adjacent to, and electrically insulated from, said ground means, whereby there is provided adjacent each connecting element a ground path of very low inductance and resistance to obtain efficient signal propagation between said first and second circuit means and to inhibit the build up of any potential difference between said first and second circuit means. An electrical connector assembly as claimed in Claim 11, wherein the configuration and characteristics of the ground means (17,18) and the insulating support (19,20,21,22) in relation to each of said connecting elements (25-28, 31-34) is such that propagation paths provided through said connecting elements have characteristic impedances which are substantially all the same. An electrical connector assembly as claimed in Claim 11 or 12, wherein the electrically insulating support (19,20,21,22) has openings therethrough which receive respective connecting elements (25-28, 31-34).

Inventors: LINDEMAN RICHARD JAY, LINDEMAN, RICHARD JAY
Applicants: LABINAL COMPONENTS & SYSTEMS, LABINAL COMPONENTS AND SYSTEMS, INC.
Application year: 1987
Main classification: H01R23
IPC codes: H01R13, H01R12, H01R24