1. Field of the Invention
The present invention relates to a connector, and more particularly to a crosstalk-proof receptacle connector that is able to suppress crosstalk between signal terminals.
2. Description of Related Art
Servers such as blade servers and rack mount servers have printed circuit boards (PCBs) mounted with connectors for high speed and stable signal transmission. Such high speed connectors have compactly arranged terminals for massive signal transmission. However, crosstalk usually occurs between adjacent terminals and becomes worse when the signal terminals are operated to transmit high frequency signals, which lowers the efficiency of signal transmission and even causes failure of signal transmission.
With reference to
If the diagonal path on the metal shielding plate 92 can be interrupted, the antenna effect will be reduced. However, no means are implemented to the connector to cut the path of antenna effect. The following prior art disclose some improvements to connectors. However, these improvements are not to cut the path of antenna effect and therefore cannot efficiently reduce the antenna effect.
U.S. Pat. No. 7,347,740 discloses a lead frame assembly for a connector having mounting holes on terminals. Dielectric material is filled in the mounting holes and partially covers the terminal. However, the connector has no any shielding element to prevent crosstalk.
U.S. Pat. No. 7,074,086 mentions another prior art U.S. Pat. No. 6,409,543 that discloses a shielding plate with multiple through holes. The through holes allow a tool to extend through the through holes during fabrication to cut fixing bars between adjacent terminals. However, no crosstalk-proof elements are made.
U.S. Pat. No. 8,182,289 discloses a connector with a lossy insert. The lossy insert has multiple holes to be engaged with pins on a wafer. No crosstalk-proof elements are disclosed in the patent.
To overcome the shortcomings, the present invention provides a crosstalk-proof receptacle connector to mitigate or obviate the aforementioned problems.
The main objective of the invention is to provide a receptacle connector that is able to suppress crosstalk between signal terminals.
A crosstalk-proof receptacle connector in accordance with the present invention comprises: multiple insulative boards arranged abreast; multiple sets of terminals mounted respectively in and corresponding to the insulative boards, and each set including signal terminals and grounding terminals; multiple shielding plates corresponding to the insulative boards and corresponding to the sets of the terminals, each shielding plate mounted on one of two opposite sides of a corresponding insulative board and having multiple current-path-interrupting holes defined through the shielding plate and kept hollow without being inserted by objects, and each shielding plate connected to the grounding terminals of a corresponding set of the terminals; and an outer casing covering the insulative boards to combine the insulative boards. The crosstalk-proof receptacle connector suppresses crosstalk and improves efficiency and stability of signal transmission.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
With reference to
The first engaging elements 12, 13 are formed on the insulative board 10.
The sets of the terminals 20s, 20g are mounted respectively in and correspond to the insulative boards 10 and each set includes signal terminals 20s and grounding terminals 20g. Each signal or grounding terminal 20s, 20g has a mounting section 21, an assembling section 22 and an electrical contacting section 23.
The mounting section 21 is embedded in a corresponding insulative board 10.
The assembling section 22 is formed on and protrudes downward from the mounting section 21 and may be soldered or press-fitted on the PCB.
The electrical contacting section 23 may be forked and is formed on and protrudes forward from the mounting section 21 to electrically contact a terminal of a plug connector corresponding to the crosstalk-proof receptacle connector.
With further reference to
According to antenna effect, an exposed metal piece easily possesses antenna characteristics, collects electric charges to increase electric potential, and then generates current. The current easily runs along a sufficiently long path on the metal piece to cause high or low frequency signal interference. Therefore, forming the current-path-interrupting holes 300 on each shielding plate 30 cuts the longest current path along a diagonal line on the shielding plate 30 into much shorter paths between adjacent current-path-interrupting holes 300, which reduces and even prevents current paths and effectively reduce the antenna effect on each shielding plate 30. As shown in
Furthermore, each shielding plate 30 of each set has at least one second engaging element 32, 33 that is engaged with the at least one of the first engaging elements 12, 13 of the corresponding insulative board 10.
The outer casing 40 covers the insulative boards 10 to combine the insulative boards 10 and has multiple socket holes 410. The socket holes 410 are defined in a front 41 of the outer casing 40 and respectively receive the electrical contacting sections 23 of the terminals 20s, 20g.
The rear assembling cover 50 is mounted on rear ends of the insulative boards 10 to ensure that the insulative boards 10 are combined and arranged abreast precisely.
In a preferred embodiment, each first engaging element 12, 13 is a recess or a protrusion, and each second engaging element 32, 33 is a protrusion or a recess corresponding to the recess or protrusion that is the first engaging element 12, 13.
In a preferred embodiment, each shielding plate 30 has a first connecting element 35 formed thereon. The first connecting element 35 may be a hooking tab. Each grounding terminal 20g has a second connecting element 25 formed thereon and connected to the first connecting element 35 on the shielding plate 30 that is connected to the grounding terminal. The second connecting element 25 may be a hooking hole hooked by the hooking tab. Furthermore, each insulative board 10 has multiple through holes 15 through which the first connecting element 35 extends.
With further reference to
According to the aforementioned comparison tables, the crosstalk of most of the terminals 20s, 20g are lowered after using the shielding plates 30 so that the signal transmission efficiency and stability are improved.
With further reference
According to the aforementioned description, the present invention has the following advantages.
1. Because each insulative board 10 is mounted with a shielding plate 30 on one side to alternately arrange the insulative boards 10 and the shielding plates 30, crosstalk between adjacent sets of terminals 20 is decreased.
2. The shielding plate 30 has multiple current-path-interrupting holes 300 to reduce and even prevent antenna effect on the shielding plate 30, which extremely suppresses crosstalk and improves efficiency and stability of signal transmission.
3. The first connecting element 35 of the shielding plate 30 is connected to the second connecting element 25 of the grounding terminal 20g so that the grounding effect is extended to direct the static electricity and signal noise likely causing crosstalk out of the receptacle connector to further improve signal transmission efficiency and stability.
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. Changes may be made in the details, 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.
Number | Date | Country | Kind |
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2013 1 0182753 | May 2013 | CN | national |
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