CN101536259A - Broadside coupled signal pair configuration for electrical connectors - Google Patents

Abstract

An electrical connector having at least four electrical contacts forming two pairs of differential signal contacts. The first and second electrical contacts may be arranged edge-to-edge along the first direction. The third electrical contact may be adjacent to the first electrical contact in a second direction substantially transverse to the first direction and arranged broadside-to-broadside with the first electrical contact in the second direction. The first and third electrical contacts may define one of a pair of differential signal contacts. The fourth electrical contact may be adjacent to the second electrical contact in the second direction and arranged broadside-to-broadside with the second electrical contact in this direction. The second and fourth electrical contacts may define another pair of differential signal contacts. The two pairs of differential signal contacts may be offset from each other in the second direction.

Description

Broadside coupled signal pair configuration for electrical connectors

Background technique

Electrical connectors provide signal connections between electronic devices using signal contacts. An electrical connector may include a leadframe assembly having a dielectric leadframe housing and a plurality of electrical contacts extending therethrough. Typically, the electrical contacts in the leadframe assembly are arranged in a linear array extending along the direction in which the leadframe assembly is stretched. The contacts may be arranged narrow side to narrow side along the direction in which the linear array extends. The electrical contacts in one or more leadframe assemblies may form differential signal pairs. A differential signal pair may consist of two contacts that carry a differential signal. The value or amplitude of the differential signal may be the difference between the respective voltages on each contact. Contacts forming a pair may be broadside coupled (ie, arranged with the broadside of one contact facing the broadside of the other contact it is paired with). Broadside or microstrip coupling is often desired as a mechanism to control (eg, minimize or eliminate) skew between contacts forming a differential signal pair.

When designing a printed circuit board (PCB), circuit designers typically establish desired differential impedances for traces on the PCB that form differential signal pairs. Thus, it is generally desirable to maintain the same desired impedance between differential signal contacts in an electrical connector, and to maintain a constant differential impedance profile along the length of the differential signal contacts from their mating end to their mounting end. It is further desirable to minimize or eliminate insertion loss (ie, the reduction in signal amplitude due to insertion of an electrical connector in a signal path). Insertion loss can be a function of the operating frequency of the electrical connector. That is, insertion loss may be greater at higher operating frequencies.

Accordingly, a need exists for a high speed electrical connector that minimizes insertion loss at higher operating frequencies while maintaining a desired differential impedance across differential signal contacts.

Contents of the invention

The disclosed embodiments include an electrical connector having at least four electrical contacts forming two pairs of differential signal contacts. The first and second electrical contacts may be arranged edge-to-edge along the first direction. The third electrical contact may be adjacent to the first electrical contact along a second direction substantially transverse to the first direction and arranged broadside-to-broadside with the first electrical contact along this direction. The first and third electrical contacts may define one of a pair of differential signal contacts. The fourth electrical contact may be adjacent to the second electrical contact in the second direction and arranged broadside-to-broadside with the second electrical contact in the direction. The second and fourth electrical contacts may define another pair of differential signal contacts. The above two pairs of differential signal contacts may be offset from each other along the second direction.

The electrical connector may include one or more non-air dielectrics, such as a first non-air dielectric disposed between first and third electrical contacts forming a pair of differential signal contacts, and a first non-air dielectric disposed to form another pair of differential signal contacts. A second non-air dielectric between the second and fourth electrical contacts of the signal contact.

The electrical connector may further include one or more ground contacts. For example, the electrical connector may include a first ground contact adjacent to the first electrical contact along a first direction and arranged edge-to-narrow with the first electrical contact along this direction. The electrical connector may also include a second ground contact adjacent to the third electrical contact along the first direction and arranged edge-to-narrow with the third electrical contact along the direction.

Description of drawings

Figures 1A and 1B depict a portion of a prior art connector system in isometric and side views, respectively;

Figure 1C depicts the contact arrangement of the prior art connector system shown in Figures 1A and 1B;

2A and 2B depict a portion of a connector system according to an embodiment in isometric and side views, respectively;

FIG. 2C depicts an example dielectric material that may be disposed between leadframe assemblies of the plug connector shown in FIGS. 2A and 2B;

Figure 2D depicts an example contact arrangement of the plug connector shown in Figures 2A and 2B;

3A and 3B depict a portion of a connector system according to another embodiment in isometric and side views, respectively;

Figure 3C depicts an example contact arrangement of the plug connector shown in Figures 3A and 3B;

4A and 4B depict a portion of a connector system according to another embodiment in isometric and side views, respectively;

Figure 4C depicts an example contact arrangement for the plug connector shown in Figures 4A and 4B;

Figures 5A and 5B depict a portion of a connector according to another embodiment in an isometric view and a rear view, respectively;

Figure 5C depicts an example contact arrangement for the connector shown in Figures 5A and 5B;

6 is a comparative graph of differential insertion loss versus frequency exhibited by the connectors shown in FIGS. 5A-5C;

7 is a comparative graph of differential impedance versus time exhibited by the connectors shown in FIGS. 5A-5C;

Figure 8 is a table summarizing the worst-case crosstalk of multi-active exhibited by the connectors shown in Figures 5A-5C;

9A and 9B depict a portion of a connector according to another embodiment in isometric views;

Figure 9C depicts an example contact arrangement for the connector shown in Figures 9A and 9B;

10 is a comparative graph of differential insertion loss versus frequency exhibited by the connectors shown in FIGS. 9A-9C;

11 is a comparative graph of differential impedance versus time exhibited by the connectors shown in FIGS. 9A-9C;

Figure 12 is a table summarizing the worst case crosstalk of multiple actives exhibited by the connectors shown in Figures 9A-9C;

13A and 13B depict a portion of a connector according to another embodiment in isometric views;

Figure 13C depicts a rear view of a portion of the connector shown in Figures 13A and 13B;

Figure 13D depicts an example contact arrangement for the connector shown in Figures 13A-13C;

14 is a comparative graph of differential insertion loss versus frequency exhibited by the connectors shown in FIGS. 13A-13D ;

15 is a comparative graph of differential impedance versus time exhibited by the connectors shown in FIGS. 13A-13D ;

Figure 16 is a table summarizing the worst case crosstalk of multiple actives exhibited by the connectors shown in Figures 13A-13D;

FIG. 17 depicts an example contact arrangement of an electrical connector according to another embodiment, wherein the differential signal contacts are arranged edge-to-edge.

Detailed ways

1A and 1B depict isometric and side views, respectively, of a prior art connector system 100 . Connector system 100 includes a plug connector 102 mated to a receptacle connector 104 . The header connector 102 may be mounted to a first substrate, such as a printed circuit board 106 . The receptacle connector 104 may be mounted to a second substrate, such as a printed circuit board 108 . Plug connector 102 and receptacle connector 104 are shown as vertical connectors. That is, the mating planes defined by each of the plug connector 102 and receptacle connector 104 are generally parallel to their respective mounting planes.

The header connector 102 may include a connector housing, a base 110 , a leadframe assembly 126 and electrical contacts 114 . The connector housing of plug connector 102 may include an interface portion 105 that defines one or more slots 107 . As discussed further below, slot 107 may house a portion of receptacle connector 104 and thus may help provide mechanical rigidity and support to connector system 100 .

Each of the leadframe assemblies 126 of the header connector 102 may include a first leadframe housing 128 and a second leadframe housing 130 . The first leadframe housing 128 and the second leadframe housing 130 may be made of a dielectric material such as, for example, plastic. The leadframe assembly 126 may be an insert molded leadframe assembly (IMLA) and may house a bar of electrical contacts 114 . For example, as discussed further below, the array of electrical contacts 114 may be arranged edge-to-edge within each leadframe assembly 126 , ie, the narrow sides of adjacent electrical contacts 114 may face each other.

The electrical contacts 114 of the plug connector 102 may each have a cross-section that defines two opposing narrow sides and two opposing broad sides. Each electrical contact 114 may also define at least three sections along its length. For example, as shown in FIG. 1B , each electrical contact 114 may define a mating end 116 , a lead portion 118 , and a terminal 121 . The mating end 116 may be blade-shaped and may be received by a corresponding electrical contact 136 of the receptacle connector 104 . Terminal 121 may be “compliant” and thus may be press-fit into aperture 124 of base 110 . The terminals 121 may be electrically connected to a ball grid array (BGA) 125 on the base surface 122 of the submount 110 . The lead portion 118 of the electrical contact 114 may extend from the terminal 121 to the mating end 116 .

The base 110 of the plug connector 102 may be made of a dielectric material, such as plastic, for example. Base 110 may define a plane having a connector face 120 and a base face 122 . The plane defined by the base 110 may be substantially parallel to the plane defined by the printed circuit board 106 . As shown in FIG. 1A , the connector face 120 of the base 110 may define apertures 124 that receive the terminals 121 of the electrical contacts 114 . The base surface 122 of the submount 110 may include the BGA 125 described above, which may electrically connect the electrical contacts 114 to the printed circuit board 106 .

The receptacle connector 104 may include a connector housing, a base 112 , a lead frame assembly 132 and electrical contacts 136 . The connector housing of receptacle connector 104 may include an interface portion 109 that defines one or more ridges 111 . Ridges 111 on the connector housing of receptacle connector 104 may engage slots 107 on the connector housing of plug connector 102 when plug connector 102 and receptacle connector 104 are mated. As such, grooves 107 and ridges 111 may provide mechanical rigidity and support to connector system 100, as mentioned above.

Each leadframe assembly 132 of the receptacle connector 104 may include a leadframe housing 133 . The leadframe housing 133 may be made of a dielectric material such as, for example, plastic. Each of the leadframe assemblies 132 may be an insert molded leadframe assembly (IMLA) and may house a bar of electrical contacts 136 . For example, the array of electrical contacts 136 may be arranged edge-to-edge in leadframe assembly 132 , ie, the narrow sides of adjacent electrical contacts 136 may face each other.

Similar to the electrical contacts 114, the electrical contacts 136 of the receptacle connector 104 may have a cross-section that defines two opposing narrow sides and two opposing broad sides. Each electrical contact 136 may define at least three sections along its length. For example, as shown in FIG. 1B , each electrical contact 136 may define a mating end 141 , a lead portion 144 and a terminal 146 . The mating end 141 of the electrical contact 136 may be any receptacle for receiving a male contact, such as the blade-shaped mating end 116 of the electrical contact 114 . For example, the mating end 141 may include at least two opposing teeth 148 defining a slot therebetween. The sockets of the mating ends 141 can receive the blade-shaped mating ends 116 of the electrical contacts 114 . The width of the slot (ie, the distance between the opposing teeth 148 ) may be less than the thickness of the blade-shaped mating end 116 . Thus, the opposing teeth 148 may exert a force on each side of the blade-shaped mating end 116 , thereby retaining the mating end 116 of the electrical contact 114 within the mating end 141 of the electrical contact 136 . Alternatively, as shown in FIG. 1A , mating end 141 may include a single tooth 148 configured to contact one side of blade-shaped mating end 116 .

The terminal 146 of the electrical contact 136 may be “compliant” and thus may be press fit into an aperture (not shown) of the base 112 . Terminals 146 may be electrically connected to ball grid array (BGA) 142 on base surface 140 of submount 112 . The lead portion 144 of each electrical contact 136 may extend from the terminal 146 to the mating end 141 .

The base 112 of the receptacle connector 104 may be made of a dielectric material such as, for example, plastic. The base 112 may define a plane having a connector face 138 and a base face 140 . The plane defined by base 112 may be substantially parallel to the plane defined by printed circuit board 108 . The connector face 138 may define apertures (not shown) for receiving the terminals 146 of the electrical contacts 136 . Although the apertures of the base 112 are not shown in FIGS. 1A and 1B , the apertures in the connector face 138 of the base 112 may be the same as or similar to the apertures 124 in the connector face 120 of the base 110 . Footprint 140 may include BGA 142 , which may electrically connect electrical contacts 136 to printed circuit board 108 .

FIG. 1C depicts the contact arrangement 190 viewed from the front of the plug connector 102 with the electrical contacts 114 arranged in a linear array therein. As shown in FIG. 1C , the electrical contacts 114 may be arranged in a 5x4 array, however it is understood that the plug connector 102 may include any number of electrical contacts 114 arranged in various configurations. As shown, the header connector 102 may include contact rows 150 , 152 , 154 , 156 , 158 and contact columns 160 , 162 , 164 , 166 .

As mentioned above, each electrical contact 114 may have a cross-section defining two opposing narrow sides and two opposing broad sides. The electrical contacts 114 may be arranged edge-to-edge along each of the columns 160 , 162 , 164 , 166 . Additionally, the electrical contacts 114 may be arranged broadside-to-broadside along each of the rows 150 , 152 , 154 , 156 , 158 . As shown in FIG. 1C , the broadsides of the electrical contacts 114 in rows 150 , 154 , 158 may be smaller than the broadsides of the electrical contacts 114 in rows 152 , 156 . All sides of each electrical contact 114 may be surrounded by a dielectric 176, which may be air.

The electrical contacts 114 in the header connector 102 may include ground contacts G and signal contacts S. As shown in FIG. As shown in FIG. 1C , the rows 150 , 154 , 158 of the header connector 102 may all include ground contacts G. As shown in FIG. The rows 152 , 156 of the header connector 102 may include ground contacts G and signal contacts S . For example, electrical contacts 114 in rows 152, 156 may be arranged in a G-S-S-G pattern. As mentioned above, the electrical contacts 114 may be arranged broadside-to-broadside along each of the rows 150 , 152 , 154 , 156 , 158 . Accordingly, adjacent signal contacts S in rows 152, 156 may form a broadside coupled differential signal pair, such as differential signal pair 174 shown in FIG. 1C.

2A and 2B depict isometric and side views, respectively, of a connector system 200 according to an embodiment. Connector system 200 may include a plug connector 202 mated to receptacle connector 104 . Plug connector 202 may be mounted to a printed circuit board 106 . The receptacle connector 104 may be mounted to a printed circuit board 108 . Plug connector 202 and receptacle connector 104 are shown as vertical connectors. However, it will be appreciated that in alternative embodiments both or either of the plug connector 202 and the receptacle connector 104 may be right angle connectors.

The header connector 202 may include a base 110 , a leadframe assembly 126 and electrical contacts 114 . As shown in FIG. 2B , header connector 202 may further include a non-air dielectric, such as dielectric material 204 , disposed between adjacent leadframe assemblies 126 . In particular, the dielectric material 204 may be disposed between adjacent leadframe assemblies housing one or more signal contacts S. As shown in FIG. The dielectric material 204 may be made of any suitable material, such as, for example, plastic. The dielectric material 204 may be molded as part of the leadframe assembly 126 . Alternatively, dielectric material 204 may be molded separately from leadframe assemblies 126 and then inserted between leadframe assemblies 126 .

FIG. 2C depicts a side view of dielectric material 204 . As shown in Figure 2C, the dielectric material 204 may include head portions 205a, 205b that extend substantially parallel to each other. The dielectric material may further comprise interconnect portions 206a, 206b extending substantially parallel to each other and substantially perpendicular to the header portions 205a, 205b. Interconnect portions 206a, 206b may connect header portion 205a to header portion 205b.

As mentioned above in FIGS. 2A and 2B , the dielectric material 204 may be disposed between adjacent leadframe assemblies 126 having signal contacts S (ie, the inner leadframe assembly 126 shown in FIGS. 2A and 2B ). More specifically, the head portion 205a of the dielectric material 204 may be adjacent to the first leadframe housing 128 and may extend along the length thereof. The head portion 205b of the dielectric material 204 may be adjacent to the second leadframe housing 130 and may extend along the length thereof. Thus, the head portions 205 a , 205 b may be disposed adjacent to at least a portion of each electrical contact 114 in the inner leadframe assembly 126 . The interconnect portions 206 a , 206 b of the dielectric material 204 may extend substantially parallel to the electrical contacts 114 in the inner leadframe assembly 126 . In particular, the interconnection portions 206a, 206b may extend along the length of each signal contact housed in the inner leadframe assembly 126, as will be discussed further below.

FIG. 2D depicts a contact arrangement 290 , including a line of electrical contacts 114 and a portion of dielectric material 204 , as viewed from the front of plug connector 202 . Similar to the contact arrangement described in FIG. 1C , the electrical contacts 114 may be arranged in a 5×4 array and may define contact rows 150 , 152 , 154 , 156 , 158 and contact columns 160 , 162 , 164 , 166 . The electrical contacts 114 in the plug connector 202 may have a cross-section defining two opposing narrow sides and two opposing broad sides. The electrical contacts 114 may be arranged edge-to-edge along each of the columns 160 , 162 , 164 , 166 . Additionally, the electrical contacts 114 may be arranged broadside-to-broadside along each of the rows 150 , 152 , 154 , 156 , 158 . The broadsides of the electrical contacts 114 in rows 150 , 154 , 158 may be smaller than the broadsides of the electrical contacts 114 in rows 152 , 156 .

The electrical contacts 114 in the plug connector 202 may also include ground contacts G and signal contacts S. As shown in FIG. Rows 150 , 154 , 158 of header connector 202 may all include ground contacts G, while rows 152 , 156 may include ground contacts G and signal contacts S. FIG. For example, electrical contacts 114 in rows 152, 156 may be arranged in a G-S-S-G pattern. The electrical contacts 114 may be arranged broadside-to-broadside along each of the rows 150 , 152 , 154 , 156 , 158 . Accordingly, adjacent signal contacts S in rows 152 , 156 may form broadside coupled differential signal pairs 174 .

As shown in FIG. 2D , interconnect portions 206 a , 206 b of dielectric material 204 may define a generally rectangular cross-section and may be disposed between adjacent signal contacts S in columns 162 , 164 . That is, the interconnection portions 206 a , 206 b may be disposed between the signal contacts S of each broadside-coupled differential signal pair 174 in the header connector 202 . Additionally, all sides of each electrical contact 114 may be surrounded by a dielectric 176 , which may be different than the dielectric material 204 disposed between the broadside-coupled differential signal pairs 174 .

As further shown in FIG. 2D, the interconnection portions 206a, 206b may extend a greater distance in the direction of the rows 150, 152, 154, 156, 158 than each electrical contact 114 (i.e., the interconnection portions 206a, 206b may be wider than the electrical contacts 114 ), however it is understood that in other embodiments the width of the interconnection portions 206 a , 206 b may be equal to or less than the width of the electrical contacts 114 . Additionally, the interconnection portions 206a, 206b may extend substantially the same distance from each electrical contact 114 in the direction of the contact columns 160, 162, 164, 166 (i.e., each interconnection portion 206a, 206b may be as tall as The heights of the electrical contacts 114 in the contact rows 152, 156 are substantially the same), however it is understood that the height of the interconnection portions 206a, 206b may be greater or less than the height of the electrical contacts 114 in other embodiments.

3A and 3B depict isometric and side views, respectively, of a connector system 300 according to another embodiment. Connector system 300 includes a plug connector 302 mated to receptacle connector 104 . Plug connector 302 may be mounted to printed circuit board 106 . The receptacle connector 104 may be mounted to a printed circuit board 108 . Plug connector 302 and receptacle connector 104 are shown as vertical connectors. However, it will be appreciated that in alternative embodiments both or either of the plug connector 302 and the receptacle connector 104 may be right angle connectors.

Plug connector 302 may include base 110 , leadframe assembly 126 and electrical contacts 114 . As shown in FIG. 3A , header connector 302 may further include a common ground plate 178 received within at least one leadframe assembly 126 . Common ground plate 178 may be a continuous conductive sheet that extends along the entire column of contacts and is grounded, thereby shielding all electrical contacts 114 adjacent to common ground plate 178 . The common ground plane 178 may include a board portion 180 , terminals 182 and a mating interface 184 .

More specifically, plate portion 180 of common ground plate 178 may be received within leadframe assembly 126 and may extend from terminal 182 to mating interface 184 . As shown in FIG. 3A , the common ground plate 178 may include a terminal 182 extending from the plate portion 180 that also extends from the second leadframe housing 130 of the leadframe assembly 126 . The terminals 182 may be “compliant” and thus may be press fit into the aperture 124 of the base 110 . Terminals 182 of common ground plane 178 may be electrically connected to BGA 125 on bottom surface 122 of submount 110 .

The common ground plate 178 may also include a mating interface 184 extending from the plate portion 180 , the mating interface 184 also extending over the first leadframe housing 128 of the leadframe assembly 126 . The mating interface 184 may be blade-shaped and may be received by the corresponding mating end 141 of the electrical contact 136 .

FIG. 3C depicts a contact arrangement 390 including a linear array of electrical contacts 114 and common ground plates 178a, 178b as viewed from the front of plug connector 302 . The electrical contacts 114 and common ground plates 178a, 178b may be arranged in a 5×4 array and may define contact rows 150 , 152 , 154 , 156 , 158 and contact columns 160 , 162 , 164 , 166 . Similar to the contact arrangement depicted in FIG. 1C , electrical contacts 114 in header connector 302 may have a cross-section defining two opposing narrow sides and two opposing broad sides. The electrical contacts 114 may be arranged edge-to-edge along each column 162 , 164 . Additionally, the electrical contacts 114 may be arranged broadside-to-broadside along each of the rows 150 , 152 , 154 , 156 , 158 . The broadsides of the electrical contacts 114 in rows 150 , 154 , 158 may be smaller than the broadsides of the electrical contacts 114 in rows 152 , 156 .

Common ground plates 178a, 178b may be disposed adjacent to contact columns 162, 164, respectively. Thus, as shown in FIG. 3C, the common ground plates 178a, 178c may replace the ground contacts G in the contact columns 160, 166 shown in FIG. 1C.

The electrical contacts 114 in the header connector 302 may include ground contacts G and signal contacts S. As shown in FIG. Rows 150 , 154 , 158 of header connector 302 may all include ground contacts G, and rows 152 , 156 may include both ground contacts G and signal contacts S. FIG. For example, common ground plates 178a, 178b and electrical contacts 114 in rows 152, 156 may be arranged in a G-S-S-G pattern. The electrical contacts 114 may be arranged broadside-to-broadside along each of the rows 150 , 152 , 154 , 156 , 158 . Accordingly, adjacent signal contacts S in a row 152 , 156 may form a broadside-coupled differential signal pair 174 .

Each common ground plate 178a, 178b may have a generally rectangular cross-section in shape. As shown in FIG. 3C , each common ground plate 178 a , 178 b may extend substantially the entire length of the column of contacts 160 , 162 , 164 , 166 . Common ground plates 178a, 178b may also extend substantially the same distance from each electrical contact 114 in the contact row direction (i.e., each common ground plate 178a, 178b may have substantially the same width as electrical contacts 114) , however, it is understood that in other embodiments, the width of the common ground plates 178a, 178b may be smaller or larger than the width of the electrical contacts 114 . All sides of the electrical contacts 114 and common ground plates 178 a , 178 b may be surrounded by a dielectric 176 .

4A and 4B depict isometric and side views, respectively, of a connector system 400 according to another embodiment. Connector system 400 may include a plug connector 402 mated to receptacle connector 104 . Plug connector 402 may be mounted to printed circuit board 106 . The receptacle connector 104 may be mounted to a printed circuit board 108 . Plug connector 402 and receptacle connector 104 are shown as vertical connectors. However, in alternative embodiments, both or either of plug connector 402 and receptacle connector 104 may be right-angle connectors. Plug connector 402 may include base 110 , lead frame assembly 126 , electrical contacts 114 , common ground plates 178 a , 178 b , and dielectric material 204 .

FIG. 4C depicts a contact arrangement 490 including a linear array of electrical contacts 114 , common ground plates 178 a , 178 b , and dielectric material 204 as viewed from the front of plug connector 402 . As shown in FIG. 4C , interconnect portions 206 a , 206 b of dielectric material 204 may define a generally rectangular cross-section and may be disposed between signal contacts S in contact columns 162 , 164 . That is, the interconnection portions 206 a , 206 b may be disposed between the broadside coupled differential signal pairs 174 in the columns of contacts 162 , 164 . Additionally, all sides of each electrical contact 114 and the common ground plate 178a, 178b may be surrounded by a dielectric 176, which may be different from the dielectric material 204 disposed between the broadside-coupled differential signal pairs 174.

As further shown in FIG. 4C, common ground plates 178a, 178b may be disposed adjacent to contact columns 162, 164, respectively. Thus, the common ground plates 178a, 178b may replace the ground contacts G in the contact columns 160, 166 shown in FIG. 1C. Each common ground plate 178a, 178b may have a generally rectangular cross-section in shape. As shown in FIG. 4C , each common ground plate 178 a , 178 b may extend substantially the entire length of the column of contacts 160 , 162 , 164 , 166 . The common ground plates 178a, 178b may also extend substantially the same distance from each electrical contact 114 in the contact row direction (i.e., each common ground plate 178a, 178b may have the same width as the electrical contacts 114), however It is understood that in other embodiments, the width of the common ground planes 178 a , 178 b may be smaller or larger than the width of the electrical contacts 114 .

The embodiments described above have been found to disrupt the coupled waves transmitted across the connector, resulting in a decibel "suck out" near the 4GHz region. One goal of the plastic is to slightly alter the impedance between signal and ground to minimize this coupled wave. A ground plane is used to minimize signal pairs coupled to ground on a single pin side and to provide a continuous ground plane.

5A and 5B depict isometric and rear views, respectively, of a connector 500 according to an embodiment. The connector 500 may be a plug connector or a socket connector. Connector 500 may have no ground plane and/or crosstalk shield. Connector 500 may be mounted to printed circuit board 510 , which may include one or more through holes 512 . Connector 500 is shown as a right angle connector. However, it is understood that in alternative embodiments, connector 500 may be a vertical connector.

Connector 500 may include a connector housing (not shown), one or more leadframe assemblies (not shown), and electrical contacts 502 . Each leadframe assembly may be an IMLA and may house a bar of electrical contacts 502 . For example, the electrical contacts 502 in each bar may be arranged side by side, that is, the narrow sides of adjacent electrical contacts 502 may face each other.

Each electrical contact 502 may define at least three sections along its length. For example, each electrical contact 502 may define a mating end 544 , a lead portion 546 and a terminal 548 . As shown in FIG. 5A , each mating end 544 may be blade-shaped and adapted to be received by a corresponding female contact (not shown). Alternatively, each mating end 544 may include one or more teeth adapted to mate with one or more sides of a corresponding male contact (not shown). Each terminal 548 may be configured to couple to printed circuit board 510 in any suitable manner. For example, each terminal 548 may be press fit into one of the through holes 512 defined by the printed circuit board 510, or may be surface mounted to the printed circuit board 510 with a fusible element such as a solder ball. Each lead portion 546 may extend from a terminal 548 to a mating end 544 . The electrical contacts 502 of the connector 500 may include signal contacts S and/or ground contacts G, as discussed further below.

Connector 500 may further include a non-air dielectric, such as dielectric material 508 , disposed between adjacent leadframe assemblies. In particular, the dielectric material 508 may be disposed between adjacent signal contacts S received by corresponding adjacent leadframe assemblies. The dielectric material 508 may be made of any suitable material, such as, for example, plastic. The dielectric material 508 may be molded as part of the leadframe assemblies, or may be molded separately from the leadframe assemblies and then inserted between the leadframe assemblies.

FIG. 5C depicts a contact arrangement 514 that includes a linear array of electrical contacts 502 as viewed from the front of the connector 500 . The electrical contacts 502 may be arranged in a 5 by 9 array and may define contact rows 516, 518, 520, 522, 524 and contact columns 526, 528, 530, 532, 534, 536, 538, 540, 542, however Any suitable configuration is suitable for an embodiment. Each column 526, 528, 530, 532, 534, 536, 538, 540, 542 may correspond to an IMLA. As shown in FIG. 5C , each electrical contact 502 in connector 500 may have a cross-section defining two opposing narrow sides and two opposing broad sides. As further shown in FIG. 5C , the broadsides of the ground contacts G may be larger than the broadsides of the signal contacts S . For example, the length of the broadside of the ground contacts G in the direction of columns 526, 528, 530, 532, 534, 536, 538, 540, 542 may be longer than the length of the signal contacts S in the same direction. In an embodiment, the length of the broadside of the ground contact G may be about two times greater than the length of the broadside of the signal contact S. Referring to FIG.

The electrical contacts 502 may be arranged edge-to-edge along each of the columns 526 , 528 , 530 , 532 , 534 , 536 , 538 , 540 , 542 . Additionally, a broadside-to-broadside arrangement may be made along each of the rows 516 , 518 , 520 , 522 , 524 . Adjacent signal contacts S in each of rows 516 , 518 , 520 , 522 , 524 may form a pair of differential signal contacts 504 . Ground contacts G may be disposed between each pair of differential signal contacts 504 in rows 516 , 518 , 520 , 522 , 524 . Additionally, a dielectric material 508 may be disposed between the signal contacts S of each pair of differential signal contacts 504 . The dielectric material 508 may serve to increase field strength within the differential signal contact pair 504 without increasing pair-to-pair coupling, crosstalk, and/or noise. Additionally, all sides of the ground contact G and the signal contact S may be surrounded by a dielectric 506 , which may be air.

Referring back to FIG. 5A , the dielectric material 508 may extend along the length of a corresponding signal contact S of each pair of differential signal contacts 504 (ie, approximately from the mating end 544 to the terminal end 548 of each signal contact S). Furthermore, the signal contacts S of the corresponding differential signal contact pair 504 may have a length that is substantially equal to the length of the signal contacts S measured between the mating end 544 and the terminal 548 . Thus, each pair of differential signal contacts 504 may exhibit approximately zero signal distortion.

Each contact column 526 , 528 , 530 , 532 , 534 , 536 , 538 , 540 , 542 may define a contact pattern, ie, an arrangement of ground contacts G and signal contacts S . For example, electrical contacts 502 in column 526 may be arranged in a G-S-S-G-S pattern (from top to bottom). The electrical contacts 502 in column 528 may be arranged in an S-G-S-S-G pattern, however it is understood that the contact pattern in column 528 may be the same as the contact pattern in column 526 when viewed from bottom to top. The electrical contacts 502 in column 530 may be arranged in an S-S-G-S-S pattern, which may be different from the corresponding contact pattern in columns 526 , 528 .

The contact pattern in columns 526, 528, 530 may be repeated in the remaining columns, i.e., column 532 may have the same contact pattern as column 526, column 534 may have the same contact pattern as column 528, column 536 may have Same contact pattern as column 530, etc. Thus, each pair of differential signal contacts 504 in row 518 may be offset (in the row direction) from the nearest pair of differential signal contacts 504 in row 516 by a full column pitch. Similarly, each pair of differential signal contacts 504 in row 520 may be offset (in the row direction) by a full column pitch from the nearest pair of differential signal contacts 504 in row 518 . It will be appreciated that some of the signal contacts S may be neutral contacts, or “extra pins,” and are not necessary to form the differential signal contact pair 504 .

As shown in FIG. 5C , one of the signal contacts S of each differential signal contact pair 504 in rows 516 , 518 , 520 , 522 , 524 may form an array defined by dashed line 550 . For example, line 550 may extend from approximately a center point on one side of a signal contact S in column 528 to approximately a center point on the same side of another signal contact S in column 536 . Similarly, ground contacts G in rows 516, 518, 520, 522, 524 may also form an array defined by dashed line 552, which may be drawn from approximately the center point on one side of ground contacts G in column 532. Extends to approximately the center point on the same side of the other ground contact G in column 540 .

It will be appreciated that the dashed lines 550, 552 may extend from any suitable point on the same side of the signal contact S and the ground contact G, respectively. It is further understood that each dashed line 550 , 552 may define an oblique angle relative to the orientation of the columns 526 , 528 , 530 , 532 , 534 , 536 , 538 , 540 , 542 . The bevel angles defined by lines 550, 552 may be substantially the same or different from each other. As shown in FIG. 5C , an array of differential signal contact pairs 504 along line 550 may be disposed between two arrays of ground contacts G along corresponding lines 552 .

The offset of the ground contacts G from row to row can be zero, less than, equal to, or greater than the column pitch. Similarly, the offset of the differential signal contact pairs 504 from row to row may be zero, less than the column pitch, equal to the column pitch, or greater than the column pitch. The row-to-row centerline spacing A may be about 1.4mm to 2.5mm, preferably about 2mm. The column-to-column centerline spacing B may be about 1.3mm to 2.5mm, preferably about 1.8mm. The ground-to-ground spacing C in each column may be about 3.9mm to 6mm, preferably about 5.4mm. The signal-to-signal spacing D in each column may be about 1.2mm, but may be in the range of about 0.3mm to 2mm. The material thickness E of the ground contact G and/or the signal contact S may be in the range of 0.2 mm to 0.4 mm, preferably a thickness of about 0.35 mm. The height F of each ground contact G is preferably about 2.4 mm, but the height F may range from about 1 mm to 2.9 mm. The spacing J between a ground contact G and an adjacent signal contact S in a column may be about 0.4mm, but may be in the range of 0.2mm to 0.7mm. The gap distance H between the signal contacts S defining the differential signal contact pair 504 is about 0.2mm to 2.5mm, the gap distance is preferably about 1.8mm, and a dielectric material 508 is disposed between the signal contacts S forming the pair . However, the signal contacts S in a column may be spaced offset from the centerline of the array by one blank thickness or more, preferably by about 0.2 mm to 0.3 mm in the opposite direction.

In an embodiment, the column 528 may include first and second signal contacts S arranged edge-to-edge along the column 528 . Column 526 may include a third signal contact S adjacent to the first signal contact S in column 528 . Column 530 may include a fourth signal contact S adjacent to the second signal contact S in column 528 . As shown in FIG. 5C, in a direction substantially perpendicular to column 528, the first and third signal contacts may be arranged broadside-to-broadside, and the second and fourth signal contacts may be arranged broadside-to-broadside. . The first and third signal contacts may define a first pair of differential signal contacts 504 and the second and fourth signal contacts may define a second pair of differential signal contacts 504 . As further shown in FIG. 5C , the first and second differential signal contact pairs 504 may be offset from each other in a direction substantially perpendicular to the columns 528 .

FIG. 6 is a comparative graph 600 of differential insertion loss versus frequency exhibited by four differential signal contact pairs 504 in connector 500 . As shown in FIG. 6, the connector 500 may exhibit an insertion loss draw of approximately -1.5 dB in the frequency range of 4 to 6 GHz.

FIG. 7 is a comparative graph 700 of differential impedance versus time exhibited by the four differential signal contact pairs 504 in the connector 500 . As shown in FIG. 7, connector 500 may exhibit a differential impedance of approximately 100 ohms plus or minus 6%.

FIG. 8 is a table 800 summarizing the multi-active worst-case crosstalk exhibited by the four differential signal contact pairs 504 in the connector 500 . As shown in FIG. 8, connector 500 may exhibit multi-active worst-case crosstalk in the range of approximately 2.6% to 5.5%. FEXT is shown in the upper two quadrants of Figure 8, while NEXT is shown in the lower two quadrants of Figure 8. Although the rise time is shown as 50 (10-90%) picoseconds, the measurement may be between 35-1000 (10-90% or 20-80%) picoseconds. These values may generally correspond to about ten gigabits per second or more to less than 622 megabits per second.

9A and 9B depict isometric views of a connector 900 according to another embodiment. FIG. 9C depicts a contact arrangement 902 comprising a linear array of electrical contacts 502 as viewed from the front of the connector 900 . Similar to connector 500, connector 900 may lack a ground plane and/or crosstalk shield. Connector 900 may be a right angle connector mounted to printed circuit board 510, however it will be appreciated that in alternative embodiments, connector 900 may be a vertical connector.

The connector 900 may generally include the same features and/or elements as the connector 500, such as one or more lead frame assemblies (not shown) for accommodating the bar array of electrical contacts 502 and adjacent signal contacts. Dielectric material 508 between contacts S. As shown in FIGS. 9A and 9B , the dielectric material 508 can extend along the length of the corresponding signal contact S in each differential signal contact pair 504. In addition, the connector 900 can have the same or similar contacts and contacts as the connector 500. Contact spacing dimensions.

As shown in FIG. 9C , the connector 900 may be different from the connector 500 in that the connector 900 may not have any ground contact G. As shown in FIG. More specifically, the contact arrangement 902 may include one or more signal contacts S arranged edge-to-edge along each of the columns 526 , 528 , 530 , 532 , 534 , 536 , 538 , 540 , 542 . Additionally, the signal contacts S may be arranged broadside-to-broadside along each of the rows 516 , 518 , 520 , 522 , 524 . Adjacent signal contacts S in each of rows 516 , 518 , 520 , 522 , 524 may form differential signal contact pairs 504 . Unlike connector 500 , ground contacts G may not be disposed between each pair of differential signal contacts 504 in rows 516 , 518 , 520 , 522 , 524 of connector 900 .

FIG. 10 is a comparative graph 1000 of differential insertion loss versus frequency exhibited by four differential signal contact pairs 504 in connector 900 . As shown in FIG. 10, the connector 900 may exhibit an insertion loss draw of approximately -0.5 dB in the 4 to 6 GHz frequency range.

FIG. 11 is a comparative graph 1100 of differential impedance versus time exhibited by four differential signal contact pairs 504 in connector 900 . As shown in FIG. 11 , the differential impedance of all but one of the differential signal contact pairs 504 may be approximately 100 ohms plus or minus 10%. It will be appreciated that the differential impedance (i.e., matched to the system impedance) can be adjusted by moving the signal contacts S forming the differential signal contact pair 504 closer or farther apart, by increasing or decreasing the signal contacts S width and/or by increasing or decreasing the dielectric constant in the gap between the signal contacts S.

FIG. 12 is a table 1200 summarizing the multi-active worst-case crosstalk exhibited by the four differential signal contact pairs 504 in the connector 900 . As shown in FIG. 12, connector 900 may exhibit multi-active worst-case crosstalk in the range of approximately 2.7% to 4.1%. FEXT is shown in the upper two quadrants of Figure 12, and NEXT is shown in the lower two quadrants of Figure 12.

13A and 13B depict isometric views of a connector 1300 according to another embodiment. FIG. 13C depicts a rear view of connector 1300 . FIG. 13D depicts a contact arrangement 1302 comprising a linear array of electrical contacts 502 as viewed from the front of the connector 1300 . Similar to connector 500, connector 1300 may lack a ground plane and/or crosstalk shield. Connector 1300 may be a right angle connector mounted to printed circuit board 510, however it will be appreciated that in alternative embodiments, connector 1300 may be a vertical connector.

Connector 1300 may generally include the same features and/or elements as connector 500 , such as one or more leadframe assemblies (not shown) for receiving the bar array of electrical contacts 502 . Each bar may include ground contacts G and signal contacts S. Additionally, connector 1300 may have the same or similar contact and contact spacing dimensions, and the same or similar contact arrangement as connector 500 .

As shown in FIG. 13D , connector 1300 may differ from connector 500 in that connector 1300 may not include dielectric material 508 disposed between adjacent signal contacts S forming differential signal contact pair 504 . In addition, the row-to-row centerline spacing K may be about 1.4mm to 3mm, preferably 1.65mm to 2mm. The column-to-column centerline spacing L is about 1.3mm to 2.5mm, preferably 1.4mm to 1.5mm.

FIG. 14 is a comparative graph 1400 of differential insertion loss versus frequency exhibited by four differential signal contact pairs 504 in connector 1300 . As shown in FIG. 14, connector 1300 may exhibit an insertion loss of less than -0.5 dB at frequencies up to 20 GHz, and approximately zero draw-out at frequencies ranging from 0 to 20 GHz. Additionally, the insertion loss values show minimal tapering in the 0 to 20 GHz frequency range. Accordingly, the insertion loss of the one or more differential signal contact pairs 504 can be maintained at -2 dB or less up to at least 40 GHz.

FIG. 15 is a comparative graph 1500 of differential impedance versus time exhibited by four differential signal contact pairs 504 in connector 1300 . As shown in FIG. 15, the differential impedance of all but one of the differential signal contact pairs 504 may be approximately 100 ohms plus or minus 10%. As described above, the differential impedance (i.e., matched to the system impedance) can be adjusted by moving the signal contacts S forming the differential signal contact pair 504 closer or farther apart, by increasing or decreasing the signal contacts S The width of S and/or is achieved by increasing or decreasing the dielectric constant in the gap between signal contacts S.

FIG. 16 is a table 1600 summarizing the multi-active worst-case crosstalk exhibited by the four differential signal contact pairs 504 in the connector 1300 . As shown in FIG. 16, connector 1300 may exhibit multi-active worst case crosstalk in the range of approximately 0.3% to 2.1%. FEXT is shown in the upper two quadrants of Figure 16, and NEXT is shown in the lower two quadrants of Figure 16.

In one or more of the above embodiments, at least a portion of the electrical contacts may be insert molded in plastic. Additionally, the electrical connector can be configured for press-fit insertion into a flat rock PCB. For example, one or more bars of electrical contacts may be layered. Each laminated bar can then be combined together to form a solid or collection of individual wafers. Alternatively, boxes with four, five or six sides can be fabricated to surround the electrical contacts. The interior of the box can be filled with air, plastic, PCB material or any combination thereof. Electrical connectors may be mounted to printed circuit boards via solder balls, fusible elements, solder fillets, and the like.

FIG. 17 depicts a contact arrangement 1700 viewed from the front of an electrical connector according to another embodiment, in which differential signal contacts are arranged edge-to-edge. The contact arrangement 1700 may include a linear array of electrical contacts 1732, which may include ground contacts G and signal contacts S. FIG. As shown in FIG. 17 , electrical contacts 1732 may be arranged in a 6×9 array and may define contact rows 1702 , 1704 , 1706 , 1708 , 1710 , 1712 and contact columns 1714 , 1716 , 1718 , 1720 , 1722 , 1724 , 1726, 1728, 1730, however, any suitable configuration may be suitable for an embodiment. Each column 1714, 1716, 1718, 1720, 1722, 1724, 1726, 1728, 1730 may correspond to an IMLA. As shown in FIG. 17, each electrical contact 1732 in the connector may have a cross-section that defines two opposing narrow sides and two opposing broad sides. As further shown in FIG. 17 , the broadsides of the ground contacts G may be larger than the broadsides of the signal contacts S . For example, in an embodiment, the broadside of the ground contact G may be about twice larger than the broadside of the signal contact S. Referring to FIG.

The electrical contacts 1732 may be arranged edge-to-edge along each of the columns 1714 , 1716 , 1718 , 1720 , 1722 , 1724 , 1726 , 1728 , 1730 . Additionally, at least a portion of the electrical contacts 1732 may be arranged broadside-to-broadside along each of the rows 1702 , 1704 , 1706 , 1708 , 1710 , 1712 . Adjacent signal contacts S in each of columns 1714 , 1716 , 1718 , 1720 , 1722 , 1724 , 1726 , 1728 , 1730 may form differential signal contact pairs 1734 . Ground contacts G may be disposed between each differential signal contact pair 1734 in columns 1714 , 1716 , 1718 , 1720 , 1722 , 1724 , 1726 , 1728 , 1730 . All sides of the ground contact G and the signal contact S may be surrounded by a dielectric 506 .

Each of the contact columns 1714, 1716, 1718, 1720, 1722, 1724, 1726, 1728, 1730 may define a contact pattern. For example, electrical contacts 1732 in column 1714 may be arranged (moving from top to bottom) in a G-S-S-G-S-S pattern. The electrical contacts 1732 in column 1716 may be arranged in an S-S-G-S-S-G pattern, however it is understood that the contact pattern in column 1716 may be the same as the contact pattern in column 1714 when viewed from bottom to top. The electrical contacts 1732 in column 1718 may be arranged in an S-G-S-S-G-S pattern, which may be different from the corresponding contact pattern in columns 1714 , 1716 .

The contact pattern in columns 1714, 1716, 1718 may be repeated in the remaining columns, i.e., column 1720 may have the same contact pattern as column 1714, column 1722 may have the same contact pattern as column 1716, and column 1724 may have the same contact pattern as column 1716. Columns 1718 have the same contact pattern, and so on. It will be appreciated that some of the signal contacts S may be neutral contacts or “extra pins” and are not required to form differential signal contact pair 1734 .

As shown in FIG. 17 , ground contacts G in rows 1702 , 1704 , 1706 , 1708 , 1710 , 1712 may form one or more arrays defined by dashed lines 1736 . For example, one of lines 1736 may extend from approximately a center point on one side of ground contact G in column 1716 to approximately a center point on the same side of another ground contact G in column 1726 . It will be appreciated that the dashed line 1736 may extend from any suitable point on the same side of the ground contact G. Each dashed line 1736 may define an oblique angle with respect to the orientation of columns 1714 , 1716 , 1718 , 1720 , 1722 , 1724 , 1726 , 1728 , 1730 . The bevel angles defined by each line 1736 may be substantially the same or different from each other.

Claims (25)

1, a kind of electric connector comprises:

Become first electrical contact and second electrical contact of narrow limit along first direction to narrow limit layout;

Along second direction three electrical contact adjacent with described first electrical contact of the basic described first direction of crosscut, wherein, described first becomes broadside to the broadside layout and define first pair of differential signal contacts with the 3rd electrical contact; And

Along described second direction four electrical contact adjacent with described second electrical contact, wherein, described second becomes broadside that second pair of differential signal contacts arranged and defined to broadside with the 4th electrical contact, and

Wherein, described first and second pairs of differential signal contacts are offset each other along described second direction.

2, electric connector as claimed in claim 1 further comprises:

Be arranged at first non-air dielectric between the described first and the 3rd electrical contact of described first pair of differential signal contacts and be arranged at second non-air dielectric between the described second and the 4th electrical contact of described second pair of differential signal contacts.

3, electric connector as claimed in claim 2 wherein, comprises one of at least plastic material in described first or second non-air dielectric.

4, electric connector as claimed in claim 2, wherein, the described first and the 3rd electrical contact is contained in respectively in first lead frame assembly and second lead frame assembly, and

Wherein, it is molded that described first non-air dielectric is independent of described first and second lead frame assemblies.

5, electric connector as claimed in claim 1 further comprises:

First grounding contact adjacent with described first electrical contact, wherein, described first grounding contact becomes narrow limit that narrow limit is arranged with described first electrical contact along described first direction;

Second grounding contact adjacent with described the 3rd electrical contact, wherein, described second grounding contact becomes narrow limit that narrow limit is arranged with described the 3rd electrical contact along described first direction.

6, electric connector as claimed in claim 5, wherein, the broadside one of at least in described first and second grounding contacts is longer than the broadside one of at least in the described first and the 3rd electrical contact on described first direction.

7, electric connector as claimed in claim 1, wherein, described second electrical contact of described first electrical contact of described first pair of differential signal contacts and described second pair of differential signal contacts forms at least a portion with respect to the contact array at described first direction definition oblique angle.

8, electric connector as claimed in claim 1, wherein, described electric connector does not have screen.

9, electric connector as claimed in claim 1, wherein, described first electrical contact comprises first abutting end and first terminals, and defines first lengths of contacts betwixt;

Wherein, described the 3rd electrical contact comprises second abutting end and second terminals, and defines second lengths of contacts betwixt; And

Wherein, described first and second lengths of contacts are equal substantially.

10, electric connector as claimed in claim 1, in wherein said first and second pairs of differential signal contacts one of at least in the insertion loss that has up to the 20GHz frequency less than-0.5dB.

11, electric connector as claimed in claim 1, wherein, having in 0 to 20GHz scope one of at least in described first and second pairs of differential signal contacts is approximately zero sucking-off.

12, a kind of electric connector comprises:

First linear array of the electrical contact that extends along first direction, wherein, described first linear array comprises into first electrical contact and second electrical contact that broadside is arranged broadside, and wherein, described first and second electrical contacts form first pair of differential signal contacts; And

Second linear array of and electrical contact that along described first direction extend adjacent with described first linear array, wherein, described second linear array comprises into the 3rd electrical contact and the 4th electrical contact that broadside is arranged broadside,

Wherein, described third and fourth electrical contact forms second pair of differential signal contacts,

Wherein, described first and second pairs of differential signal contacts are offset each other along described first direction, and

Wherein, described second electrical contact and described the 3rd electrical contact become narrow limit that narrow limit is arranged being basically perpendicular on the second direction of described first direction.

13, electric connector as claimed in claim 12 further comprises:

Be arranged at first non-air dielectric between described first and second electrical contacts; And

Be arranged at second non-air dielectric between described third and fourth electrical contact.

14, electric connector as claimed in claim 13, wherein, described first and second electrical contacts are contained in respectively in first lead frame assembly and second lead frame assembly, and

Wherein, described first non-air dielectric forms as the part one of at least in described first or second lead frame assembly.

15, electric connector as claimed in claim 12 further comprises grounding contact, and described grounding contact is adjacent with described first electrical contact along described second direction, and adjacent with described the 3rd electrical contact along described first direction.

16, electric connector as claimed in claim 15, wherein, described grounding contact becomes narrow limit that narrow limit is arranged with described first electrical contact, and

Wherein, described grounding contact becomes broadside that broadside is arranged with described the 3rd electrical contact.

17, electric connector as claimed in claim 15, wherein, the broadside of described grounding contact is longer than the broadside one of at least in the described first and the 3rd electrical contact on described second direction.

18, electric connector as claimed in claim 12 wherein, one of at least is configured to make signal skew to minimize in described first or second pair of differential signal contacts.

19, electric connector as claimed in claim 12, wherein, described electric connector does not have screen.

20, a kind of electric connector comprises:

Define first linear array of the electrical contact of the first contact style along first direction;

Second linear array of the electrical contact adjacent with described first linear array, wherein, described second linear array defines the second contact style along the second direction opposite with described first direction, and wherein, the described first and second contact styles are basic identical; And

The 3rd linear array of the electrical contact adjacent with described second linear array, wherein, described the 3rd linear array along described first or second direction define the 3rd contact style, wherein, described the 3rd contact style is different from the described first and second contact styles, and described first, second repeats in the adjacent linear array of electrical contact with the 3rd style.

21, electric connector as claimed in claim 20 further comprises in described first, second and the 3rd linear array of electrical contact each most air dielectric.

22, electric connector as claimed in claim 20, wherein, described first linear array comprises into more than first electrical contact that narrow limit is arranged narrow limit,

Wherein, described second linear array comprises into more than second electrical contact that narrow limit is arranged narrow limit,

Wherein, described the 3rd linear array comprises into more than the 3rd electrical contact that narrow limit is arranged narrow limit,

Wherein, first electrical contact of described first linear array and second electrical contact of described second linear array form first pair of differential signal contacts, and

Wherein, the 4th electrical contact of the 3rd electrical contact of described second linear array and described the 3rd linear array forms second pair of differential signal contacts.

23, electric connector as claimed in claim 22, wherein, described first and second pairs of differential signal contacts upwards are offset each other in the four directions that is basically perpendicular to described first direction.

24, electric connector as claimed in claim 22, wherein, described more than first electrical contact, described more than second contact and described more than the 3rd contact comprise first grounding contact, second grounding contact and the 3rd grounding contact respectively, and

Wherein, described first, second forms the array that defines the oblique angle with respect to described first direction with the 3rd grounding contact.

25, electric connector as claimed in claim 22, wherein, described first and second pairs of differential signal contacts form the array with respect to described first direction definition oblique angle.

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