BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electrical connector, particularly, to an electrical connector with terminal grooves in communication with each other for controlling the impedance of the electrical connector.
2. Description of the Related Art
Systems facilitating high-speed data transfer require electrical connectors in which the electrical impedance can be controlled in order to reach the required data transfer rate of the electrical system. It is mandatory that within a high-speed data transfer system, the connector has to be kept with a controlled impedance such that the data transfer rate can be kept within the nominal ranges. The impedance of a connector may be controlled by spacing of the terminals (i.e. exposing partially of the contact terminal into the air), the dimension of the terminals and the thickness within the connector housing. Therefore, an improved electrical connector is highly desired to overcome the aforementioned problem.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an electrical connector for controlling the impedance.
In order to achieve the object set forth, an electrical connector includes an insulative housing defining a plurality of terminal grooves therein and extending along a mating direction. A plurality of terminals are designated as signal terminals and grounding terminals and respectively received in said terminal grooves in a manner of two neighboring signal terminals adjacent to one grounding terminal which are designated as a terminal group. The grounding terminal and signal terminals which are in a same terminal group face to each other through a path defined therebetween.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of an electrical connector made in accordance with the present invention;
FIG. 2 is an exploded perspective view of the electrical connector shown in FIG. 1;
FIG. 3 is another exploded perspective view of the electrical connector shown in FIG. 1;
FIG. 4 is a perspective view of terminals of the electrical connector shown in FIG. 1;
FIG. 5 is a cross-sectional view of the electrical connector shown in FIG. 1 along line 5-5;
FIG. 6 is a partly-amplified view of the electrical connector shown in FIG. 1;
FIG. 7 is a perspective view of a second embodiment of the electrical connector; and
FIG. 8 is a cross-sectional view of the electrical connector shown in FIG. 7 along line 8-8.
DETAILED DESCRIPTION OF THE INVENTION
Reference will now be made to the drawing figures to describe a preferred embodiment of the present invention in detail. Referring to FIGS. 1 and 2, an electrical connector 100 made according to the preferred embodiment of the present invention is disclosed and comprises an insulative housing 20, a plurality of terminals 30 and a pair of metallic plates 40 received in the insulative housing 20.
Referring to FIGS. 2 and 3, the insulative housing 20 comprises a first housing 21 for mounting onto a printed circuit board and a second housing 22 stacked to the first housing 21. Both of the first and second housings 21, 22 define a plurality of terminal grooves 23 located at opposite sides thereof and running through the first and second housings 21, 22 along a mating direction. The terminal grooves 23 are side-by-side arranged along a transverse direction perpendicular to the mating direction. Both of the first and second housings 21, 22 define a receiving space 24 therein for receiving said metallic plate 40. Each receiving space 24 is divided into two separate parts by a partition portion 27. The second housing 22 defines a pair of posts 221 on a rear portion and secured in apertures 212 defined on a front portion of the first housing 21 so as to combing the first and second housings 21, 22 together. A pair of posts 211 are also formed on a rear portion of the first housing 21 for securing the electrical connector 100 on the printed circuit board. A pair of tongue plates 222 are formed in the front portion of the second housing 22 for cooperating with a complementary mating connector (not shown).
Referring to FIGS. 3 and 4, the terminals 30 are arranged into two rows and respectively received in the terminals grooves 23. The terminals 30 are designated as signal terminals 31 and grounding terminals 32, wherein every neighboring signal terminals 31 are accompanying with a grounding terminal 32 so as to form a terminal group. Each signal terminal 31 and grounding terminal 32 comprise retaining portions 311, 321 secured in the insulative housing 30, contacting portions 312, 322 extending from one end of the retaining portion 311, 321, and solder portions 313, 323 extending from the other end of the retaining portion 311, 321.
Referring to FIGS. 4-6, the terminal grooves 23 comprise first terminal grooves 231 for receiving the signal terminals 31 and second terminal grooves 232 for receiving the grounding terminals 32. A path 25 is defined between adjacent first terminal grooves 231 therefore the adjacent first terminal grooves 231 are in communication with each other. When the signal terminals 31 are inserted into the first terminal grooves 231, the retaining portions 311 of the neighboring signal terminals 31 will be face-to-face arranged partly, and the medium between the adjacent signal terminals changes into atmosphere from the original insulative material (plastic material in the present invention). As known, the dielectric constant of the atmosphere is lower than that of the plastic material, and the dielectric constant is inversely proportional to capacitance, therefore the capacitance between adjacent signal terminals 31 can be increased by the modification of the present invention. The impedance of the electrical connector is relative to the capacitance of the terminals, hence, the modification of the path 25 can turn the impedance of the electrical connector.
However, if every adjacent terminal groove 23 defines the path 25 therein, the rigidity of the insulative housing 20 will be weaken and can not provide a steadily and reliable retaining effect for the terminals 30. As described above, each terminal group comprises two signal terminals 31 and a grounding terminal 32, therefore a partition wall 26 can be arranged between adjacent terminal groups under condition that the path 25 is formed between every terminal 30 of the terminal group. The partition wall 26 can increase the rigidity of the insulative housing 20 and every terminal group is separated from each other by the partition wall 26.
Referring to FIGS. 7-8, a second embodiment of the electrical connector 100′ according to the present invention is provided and comprises an insulative housing 20′ with a plurality of terminals 30′ retained therein. The insulative housing 20′ is formed by a first housing 21′ and a second housing 22′ which are stacked together. A plurality of terminal grooves 23′ are defined in the first and second housings 21′, 22′ for receiving said terminals 30′ therein. Differently from the first embodiment, the insulative housing 20′ defines a passageway 25′ between the opposite side walls 251′ and runs through the terminal grooves 23′ along a transverse direction perpendicular to the mating direction, i.e., the passageway 25′ runs across the terminal grooves 23′. As the width of the passageway 25′ in the mating direction is limited, the rigidity of the insulative housing 20′ will be not weakened. More importantly, the existence of the passageway 25′ allows the adjacent terminal grooves 23′ to communicate with each other, therefore the terminals 30′ received in the terminal grooves 23′ face the adjacent terminals 30′, which is advantageous for tuning the impendence of the electrical connector 100′.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Patent Grant
7828597
