Electrical connector with two ground bars connecting each other

[0001] 1. Field of the Invention

[0002] The present invention relates to an electrical connector, especially to a high-frequency electrical connector.

[0003] 2. Description of Related Art

[0004] US Pat. No. US2009/0221165 discloses a high-frequency connector up to 6 Gbps, which comprises a housing loading a plurality of electrical contacts. The electrical contacts include a plurality of signal contacts and a plurality of ground contacts. A shieldless ground coupling assembly places at least a portion of the ground contacts in electrical communication with each other. The only one ground bar fails to meet a high-frequency performance up to 12 Gbps.

[0005] Hence, an electrical connector of a high-frequency performance is desired.

[0006] Accordingly, an object of the present invention is to provide an electrical connector with a high-frequency performance.

[0007] To achieve the above object, an electrical connector comprises an insulating housing and a plurality of contacts. The contacts include a plurality of signal contacts arranged in differential signal pairs and a plurality of ground contacts. Every two adjacent differential signal pairs is separated by a ground contact. A first ground bar connects each ground contact to form a first electrical connection. A second ground bar connects each ground contact to form a second electrical connection. The first ground bar is electrically connected to the second ground bar through at least a bridge.

[0008] Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0016] Reference will now be made to the drawing figures to describe the preferred embodiment of the present invention in details. FIG. 1 illustrates an electrical connector assembly 1000 to transmit high frequency signals, which comprises a first electrical connector 100 in a plug connector type and a second electrical connector 200 in a receptacle connector type, mating with each other along a mating direction. The first electrical connector 100 comprises an insulating housing 10 and several plug contacts 20 loaded in the insulating housing 10. The second electrical connector 200 comprises an insulating housing 30 and a plurality of receptacle contacts 40 loaded in the insulating housing 30. The first electrical connector 100 defines a mating tongue 11 intending to be inserted into a mating slot 31 defined by the second electrical connector 200. A pair of guiding posts 32 of the second electrical connector 200 is guided into a corresponding pair of U shaped guiding recesses 12 of the first electrical connector 100.

[0017] Referring to FIG. 2 to FIG. 3, the mating tongue 11 extends from a base 13 of the insulating housing 10 along the mating direction and a lengthwise direction perpendicular to the mating direction. The mating tongue 11 defines an upper face 111, an opposite lower face 112 and a protrusion 113 on the upper face 111. The upper face 111 is divided into a first area 111a and a second area 111b by said protrusion 113. The plug contacts 20 are of plate form, each has a contacting portion 21 embedded in the mating tongue 11, a retaining portion 22 retained in the mating tongue or/and base 13 and a leg portion 23 extending out of a rear face of the base 13. The retaining portion 22 joints the contacting portion 21 and the soldering portion 23. The first contacts 20 are arranged into three groups 20a, 20b, 20c along the mating tongue 11. The contacting portions 21a, 21b of the first and second groups 20a, 20b of the contacts are located at the first and second areas 111a, 111b of the upper face 111. The contacting portions 21c of the third group 20c of contacts are located at the lower face 112 and corresponding to the protrusion 113. The first and third groups of contacts 20a, 20c are used to transmit data signals while the second group of contacts 20b is used to transmit power signals.

[0018] Each of the first and third groups 20a, 20c of contacts includes two pairs of differential signal pair 241 and three individual ground contacts 242 separating two pairs of the signal pair. Combination with FIGS. 3 and 4, a first ground bar 25 and a second ground bar 26 are provided to connect the individual ground contacts 241, the first ground bar 25 includes a beam 251 and a plurality of first elastic arms 252a and second elastic arms 252b. The second ground bar 26 includes a beam 261 and a plurality of first elastic arms 262a and second elastic arms 262b. The first and second ground bars are retained in the insulating housing, the first ground bar 25 is loaded in the mating tongue 11 and the second ground bar 26 is retained in the base 13. The first elastic arms 252a, 262a of the first and second ground bars 25, 26 touch the contacting portions 21a, 21c of the contacts 20a, 20c. The second elastic arms 252b, 262b of the first and second ground bars 25, 26 touch the retaining portions 22a, 22c of the contacts 20a, 20c. The first elastic arms 252a, 262a each defines a downward opening 253 while the second elastic arms 252b, 262b each defines an upward opening 263. The elastic arms 252a, 252b of the first ground bar 25 are symmetric to the elastic arms 262a, 262b of the second ground bar 26 with respect to an invisible line. The first ground bar 25 is also symmetric to the second ground bar 26 with respect to said invisible line.

[0019] The first ground bar 25 is electrically connected to the second ground bar 26 via two bridges 24 so as to form a closed circuit. The closed circuit can decrease voltage distribution among the elastic arms or among ground contacts. The crosstalk between the differential pairs will be reduced because of little voltage distribution. The two bridges are parallel to each other. One bridge is also acceptable and the high-frequency performance may be little worse than two bridges. Please mention that the bridges won't align with the third group 20c of contacts from a top-to-bottom view for little pitch between adjacent contacts.

[0020] A spacer 27 is provided to used to retain the soldering portions of the first series of contacts 20a. The retaining elements 28 are attached to a PCB after being assembled to the insulating housing 10.

[0021] The second electrical connector 200 comprises insulating housing 30, contacts 40 assembled on the insulating housing. A first ground bar 50 includes several elastic arms connecting retaining portions of the ground contacts of a group of contacts 40c. A second ground bar 60 includes several plate-shaped bridges 61 connecting the first ground bar 50. When the first electrical connector 100 mates with the electrical second connector 200, the contacting portions 41c of the second electrical connector will be deformed by the contacting portions 21c of the first electrical connector and touch the bridges 61. It is noted that the housing 30 is composed of two opposite side walls sandwiching the mating slot 31 therebetween wherein one of the side walls defines a cutout without the contacts 40 therein while the other of the side walls has the contact 40 located only vertically in alignment with the cutout. In addition, the side wall having the cutout defines an outwardly protruding region on an exterior surface in alignment with the cutout along the vertical direction while the side wall without said cutout defines an even exterior surface thereof.

[0022] While preferred embodiments in accordance with the present invention has been shown and described, equivalent modifications and changes known to persons skilled in the art according to the spirit of the present invention are considered within the scope of the present invention as defined in the appended claims.