Patent Publication Number: US-11664630-B2

Title: Terminal assembly and electrical connector

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Chinese Patent Application Serial Number 202011073423.8, filed on Oct. 9, 2020, the full disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to the technical field of connector, particularly to a terminal assembly and electrical connector. 
     Related Art 
     As the transmission rate of connectors increases, the requirements for crosstalk index of the connector becomes more strict, and reducing the crosstalk in connectors also becomes a crucial issue. Conventional connectors often comprise a terminal assembly, which comprises a plurality of terminals disposed at intervals and an insulating body. The plurality of terminals often comprises a plurality of ground terminals and a plurality of signal terminals. Two signals are disposed between two ground terminals and form a differential signal pair. However, the two ground terminals can only shield a part of the signal terminals, so the plurality of signal terminals would still mutually crosstalk. 
     SUMMARY 
     The embodiments of the present disclosure provide an electrical connector tended to solve the problem that conventional connectors are prone to signal crosstalk during signal transmission. 
     In one embodiment, a terminal assembly is provided, comprising a plurality of terminals, an insulating body, a first electromagnetic shielding member, and a second electromagnetic shielding member. The plurality of terminals comprises a plurality of signal terminals and a plurality of ground terminals. The plurality of signal terminals and the plurality of ground terminals are disposed at intervals. At least one signal terminal is disposed between two adjacent ground terminals. The insulating body is disposed at the plurality of terminals. One end of each of the terminals protrudes from one side of the insulating body. The other end of each of the terminals is exposed from the insulating body. The first electromagnetic shielding member is disposed at one side of the insulating body and is connected with the plurality of ground terminals. The second electromagnetic shielding member is disposed at the other side of the insulating body and is opposite to the first electromagnetic shielding member. The second electromagnetic shielding member is connected with the plurality of ground terminals. The second electromagnetic shielding member comprises a plurality of ground elastic pieces disposed at intervals extending in a direction away from the insulating body. 
     In another embodiment, an electrical connector is provided, comprising a terminal assembly according to the above embodiment, a plurality of cables, a housing, and a metal cover. The plurality of cables are electrically connected with one ends of the plurality of terminals of the terminal assembly, respectively. The housing accommodates the terminal assembly. One ends of the plurality of terminals away from the plurality of the cables and the plurality of ground elastic pieces protrude from the housing. The plurality of cables protrude from one side of the housing. The metal cover is disposed on the housing. 
     In the embodiments of the present disclosure, by increasing the plurality of ground elastic pieces to be disposed on the second electromagnetic shielding member, the plurality of ground elastic pieces can be respectively connected with the ground terminals of a mating connector to avoid crosstalk among the plurality of signal terminals transmitting signals between the electrical connector and the mating connector. Thus, the signal transmission performance of electrical connectors can be effectively improved. 
     It should be understood, however, that this summary may not contain all aspects and embodiments of the present disclosure, that this summary is not meant to be limiting or restrictive in any manner, and that the disclosure as disclosed herein will be understood by one of ordinary skill in the art to encompass obvious improvements and modifications thereto. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The features of the exemplary embodiments believed to be novel and the elements and/or the steps characteristic of the exemplary embodiments are set forth with particularity in the appended claims. The Figures are for illustration purposes only and are not drawn to scale. The exemplary embodiments, both as to organization and method of operation, may best be understood by reference to the detailed description which follows taken in conjunction with the accompanying drawings in which: 
         FIG.  1    is a perspective view of an electrical connector of the first embodiment of the present disclosure; 
         FIG.  2    is another perspective view of the electrical connector of the first embodiment of the present disclosure; 
         FIG.  3    is an exploded view of the electrical connector of the first embodiment of the present disclosure; 
         FIG.  4    is a perspective view of a first terminal assembly of the first embodiment of the present disclosure; 
         FIG.  5    is an exploded view of a first terminal assembly of the first embodiment of the present disclosure; 
         FIG.  6    is a schematic diagram of a plurality of terminals of the first embodiment of the present disclosure; 
         FIG.  7    is a diagram showing the assembly between a cable and the first terminal assembly of the first embodiment of the present disclosure; 
         FIG.  8    is a perspective view of a differential signal pair of the first embodiment of the present disclosure; 
         FIG.  9    is a perspective view of a ground terminal of the first embodiment of the present disclosure; 
         FIG.  10    is a cross-sectional view along line A-A′ of  FIG.  4   ; 
         FIG.  11    is another exploded view of the first terminal assembly of the first embodiment of the present disclosure; 
         FIG.  12    is a schematic diagram showing the connection between the first terminal assembly and the cable of the first embodiment of the present disclosure; 
         FIG.  13    is a perspective view of a second terminal assembly of the first embodiment of the present disclosure; 
         FIG.  14    is a cross-sectional view along line B-B′ of  FIG.  13   ; 
         FIG.  15    is a use state diagram of the electrical connector of the first embodiment of the present disclosure; 
         FIG.  16    is a schematic diagram of a mating connector of the first embodiment of the present disclosure; 
         FIG.  17    is a schematic diagram of a mating connector of the second embodiment of the present disclosure; 
         FIG.  18    is a schematic diagram of a mating connector of the third embodiment of the present disclosure; 
         FIG.  19    is a schematic diagram of a mating connector of the fourth embodiment of the present disclosure; 
         FIG.  20    is a schematic diagram of a mating connector of the fifth embodiment of the present disclosure; 
         FIG.  21    is a schematic diagram of a mating connector of the sixth embodiment of the present disclosure; 
         FIG.  22    is a schematic diagram of a mating connector of the seventh embodiment of the present disclosure; and 
         FIG.  23    is a schematic diagram of a mating connector of the eighth embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. This present disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. 
     Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but function. In the following description and in the claims, the terms “include/including” and “comprise/comprising” are used in an open-ended fashion, and thus should be interpreted as “including but not limited to”. “Substantial/substantially” means, within an acceptable error range, the person skilled in the art may solve the technical problem in a certain error range to achieve the basic technical effect. 
     The following description is of the best-contemplated mode of carrying out the disclosure. This description is made for the purpose of illustration of the general principles of the disclosure and should not be taken in a limiting sense. The scope of the disclosure is best determined by reference to the appended claims. 
     Moreover, the terms “include”, “contain”, and any variation thereof are intended to cover a non-exclusive inclusion. Therefore, a process, method, object, or device that includes a series of elements not only includes these elements, but also includes other elements not specified expressly, or may include inherent elements of the process, method, object, or device. If no more limitations are made, an element limited by “include a/an . . . ” does not exclude other same elements existing in the process, the method, the article, or the device which includes the element. 
       FIG.  1    to  FIG.  3    are perspective views and an exploded view of an electrical connector of the first embodiment of the present disclosure. As shown in the figures, in this embodiment, the electrical connector  1  comprises a terminal assembly  10 , a plurality of cables  11 , and a housing  12 . The number of terminal assemblies  10  is two, and each of the terminal assemblies  10  comprises a plurality of terminals  101 . The plurality of cables  11  are respectively connected with one end of each of the terminals  101  of each of the terminal assemblies  10 . Two terminal assemblies  10  are disposed in the housing  12 . Specifically, the housing  12  comprises two accommodating grooves  121 . The two accommodating grooves  121  are disposed along a first direction X at intervals and respectively extend along a second direction Y. The two terminal assemblies  10  are respectively disposed in the corresponding accommodating groove  121 . The plurality of terminals  101  of each of the terminal assemblies  10  are disposed along the second direction Y at intervals and respectively extend along the first direction X. One end of each of the terminals  101  away from the cable  11  protrudes from the housing  12  through the bottom of the corresponding accommodating groove  121 . Specifically, the housing  12  further comprises a plurality of terminal through holes  122 , which are respectively disposed on a bottom surface of the corresponding accommodating groove  121 . The plurality of terminal through holes  122  in each of the accommodating grooves  121  are disposed on the bottom surface of the accommodating groove  121  along the second direction Y at intervals and penetrate the housing  12  along a third direction Z. In this embodiment, each of the terminal through holes  122  is an elongated hole, that is, the terminal through hole  122  is extending along the first direction X. The plurality of cables  11  extend along the first direction X. One end of each of the terminals  101  away from the cable  11  protrudes from the corresponding terminal through hole  122  through the housing  12 . One ends of the plurality of cables  11  away from the plurality of terminals  101  protrude from one side of the housing  12  along the first direction X. Specifically, one side of the housing  12  in the first direction X comprises a wiring opening  123  communicating with an adjacent accommodating groove  121 . One ends of the plurality of cables  11  away from the plurality of terminals  101  pass through the wiring opening  123  to protrude from the housing  12 . The housing  12  is made of insulative material. 
     The detailed configuration of the terminal assembly  10  disposed in the corresponding accommodating groove  121  is described below. Herein, the terminal assembly  10  of the accommodating groove  121  on the left side of  FIG.  3    is defined as the first terminal assembly  10   a  and the terminal assembly  10  of the accommodating groove  121  on the right side of  FIG.  3    is defined as the second terminal assembly  10   b  for further description.  FIG.  4    and  FIG.  5    are perspective view and exploded view of a first terminal assembly of the first embodiment of the present disclosure.  FIG.  6    is a schematic diagram of a plurality of terminals of the first embodiment of the present disclosure. As shown in the figure, in this embodiment, each of the terminals  10  comprises a contacting end part  1011  and a connecting end part  1012 . The first terminal assembly  10   a  further comprises an insulating body  102 , which is disposed at the plurality of terminals  101 . The contacting end part  1011  of each of the terminals  101  protrudes from one side of the insulating body  102  in the first direction X. The connecting end part  1012  of each of the terminals  101  is exposed from a surface of the insulating body  102  in the third direction Z for the connection between the cable  11  and the connecting end part  1012  of the corresponding terminal  101 . In this embodiment, the plurality of terminals  101  comprises a plurality of signal terminals  101   a  and a plurality of ground terminals  101   b . The plurality of signal terminals  101   a  are disposed between two adjacent ground terminals  101   b  and form a group of signal pair. Each of the signal terminals  101   a  comprises a contacting end part  1011  and a connecting end part  1012 , and each of the ground terminals  101   b  also comprises a contacting end part  1011  and a connecting end part  1012 .  FIG.  7    is a diagram showing the assembly between a cable and the first terminal assembly of the first embodiment of the present disclosure. As shown in the figure, each of the cables  11  comprises a signal line  111  and a ground line  112 . The signal line  111  of each of the cables  11  is connected with the connecting end part  1012  of the corresponding signal terminal  101   a , and the ground line  112  of each of the cables  11  is connected with the connecting end part  1012  of the corresponding ground terminal  101   b . In this embodiment, the ground line  112  is connected with the connecting end part  1012  of the corresponding ground terminal  101   b  through an electromagnetic shielding member, which would be further described hereinafter. 
     Referring to  FIG.  6    again, in this embodiment, two signal terminals  101   a  are disposed between two adjacent ground terminals  101   b  and form a differential signal pair. A first gap distance D 1  exists between a centerline of each of the signal terminals  101   a  and a centerline of adjacent signal terminals  101   a . A second gap distance D 2  exists between a centerline of each of the signal terminals  101   a  and a centerline of adjacent ground terminals  101   b . The second gap distance D 2  is greater than the first gap distance D 1 , which indicates that the plurality of terminals  101  are arranged at unequal intervals. In this way, the gap distance between two adjacent differential signal pairs where the plurality of terminals  101  are arranged at unequal intervals is greater than the gap distance between two adjacent differential signal pairs where the plurality of terminals  101  are arranged at equal intervals (having two adjacent differential signal pairs to move in an opposite direction to increase the gap distance in between) to reduce signal crosstalk between two adjacent differential signal pairs. The width of each of the ground terminals  101   b  in the second direction Y is wider than the width of each of the signal terminals  101   a  in the second direction Y. Thus, the second gap distance D 2  between the centerline of each of the signal terminals  101   a  and the centerline of the adjacent ground terminal  101   b  can be increased to increase the distance between the two adjacent differential signal pairs and to further reduce signal crosstalk between the adjacent two differential signal pairs. 
       FIG.  8    is a perspective view of a differential signal pair of the first embodiment of the present disclosure.  FIG.  9    is a perspective view of a ground terminal of the first embodiment of the present disclosure. In one embodiment, as shown in the figures, each of the terminals  101   s  (comprising the signal terminal  101   a  and the ground terminal  101   b ) further comprises a connecting part  1013 . The contacting end part  1011  and the connecting end part  1012  are respectively connected with two opposite ends of the connecting part  1013 . The contacting end part  1011  is inclined to the connecting end part  1012 . An angle forms between the extending direction of the contacting end part  1011  and the extending direction of the connecting end part  1012 . In one embodiment, the length of the connecting end part  1012  of each of the signal terminals  101   a  extending from the connecting part  1013  in the first direction X (the direction away from the connecting part  1013 ) is shorter than the length of the connecting end part  1012  of each of the ground terminals  101   b  extending from the connecting part  1013  in the first direction X (the direction away from the connecting part  1013 ) (shown in  FIG.  6   ). Thus, the two adjacent ground terminals  101   b  can protect the two signal terminals  101   a  disposed between the two adjacent ground terminals  101   b , avoiding signal crosstalk between the adjacent two differential signal pairs. 
     In one embodiment, the two signal terminals  101   a  between two adjacent ground terminals  101   b  are symmetrically disposed (shown in  FIG.  8   ). The connecting end part  1012  of each of the signal terminals  101   a  comprises a connecting main body  10121  and a cable connecting body  10122 . The connecting main body  10121  is connected with the connecting part  1013 . The cable connecting body  10122  is connected with one end of the connecting main body  10121  away from the connecting part  1013 . The width of the cable connecting body  10122  in the second direction Y is greater than or equal to the wire diameter of the signal line  111  of the cable  11 , so that the stability of the connection between the cable  11  and the signal terminal  101   a  can be ensured. The cable connecting body  10122  of each of the signal terminals  101   a  is closer than the connecting main body  10121  to the adjacent ground terminal  101   b . The gap distance between two cable connecting bodies  10122  of two adjacent signal terminals  101   a  is greater than the gap distance between two connecting main bodies  10121  of the two adjacent signal terminals  101   a , so the two signal lines  111  of the cable  11  can be connected with the corresponding cable connecting body  10122 . Meanwhile, two opposite sides of the connecting end part  1012  of each of the ground terminals  101   b  in the second direction Y respectively comprise a first notch  10123 . Each of the first notches  10123  corresponds to the cable connecting body  10122  of an adjacent signal terminal  101   a  (shown in  FIG.  6   ). The first notch  10123  could increase the gap distance between the cable connecting body  10122  of each of the signal terminals  101   a  and an adjacent ground terminal  101   b  to keep the signal transmission performance of the electrical connector  1  from being affected. 
     In one embodiment, the connecting part  1013  of each of the terminals  101  is bent to allow a difference in height between the connecting end part  1012  and the contacting end part  1011  of each of the terminals  101 . In this embodiment, the contacting end part  1011  and the connecting end part  1012  of each of the terminals  101  are disposed along the third direction Z at intervals. The connecting part  1013  comprises a connecting body  10131  and is disposed between the contacting end part  1011  and the connecting end part  1012 . The extending direction of the connecting body  10131  intersects with the extending direction of the contacting end part  1011  and the extending direction of the connecting end part  1012  respectively. In this embodiment, the connecting body  10131  extends along the third direction Z. 
     In this embodiment, the width of the connecting part  1013  of each of the signal terminals  101   a  in the second direction Y is narrower than the width of the contacting end part  1011  and the width of the connecting end part  1012  of the signal terminal  101   a  in the second direction Y. In this way, the gap distance between the connecting part  1013  of each of the signal terminals  101   a  and the connecting part  1013  of an adjacent ground terminal  101   b  can be increased. The connecting part  1013  of each of the signal terminals  101   a  further comprises a bump  10132 . The bump  10132  is disposed on one side of the connecting body  10131  in the second direction Y, and extends toward the connecting body  10131  of the adjacent signal terminal  101   a  from the connecting body  10131 . The bump  10132  of the connecting part  1013  of each of the signal terminals  101   a  is opposed to the bump  10132  of the connecting part  1013  of the adjacent signal terminal  101   a  to shorten the gap distance between the connecting part  1013  of each of the signal terminals  101   a  and the connecting part  1013  of the adjacent signal terminal  101   a.    
     In one embodiment, the contacting end part  1011  of each of the terminals  101  (comprising the signal terminal  101   a  and the ground terminal  101   b ) comprises a contacting main body  10111  and a contacting elastic piece  10112 . The contacting main body  10111  is connected with one end of the connecting part  1013  away from the connecting end part  1012 . The contacting elastic piece  10112  is connected with one end of the contacting main body  10111  away from the connecting part  1013 . The width of the contacting main body  10111  of each of the terminals  101  in the second direction Y is wider than the width of the contacting elastic piece  10112  in the second direction Y. In this way, the gap distance between the contacting elastic piece  10112  of each of the terminals  101  and the contacting elastic piece  10112  of the adjacent terminal  101  can be increased. In this embodiment, the distance between the contacting elastic piece  10112  of each of the signal terminals  101   a  and the contacting elastic piece  10112  of the adjacent ground terminal  101   b  is greater than the distance between the contacting elastic piece  10112  of each of the signal terminals  101   a  and the contacting elastic piece  10112  of the adjacent signal terminal  101   a.    
     In this embodiment, a surface of the contacting elastic piece  10112  of each of the signal terminals  101   a  close to the adjacent signal terminal  101   a  and a surface of the contacting main body  10111  close to the adjacent signal terminal  101   a  of each signal terminals  101   a  are on the same plane, allowing the distance between the contacting main body  10111  of each of the signal terminals  101   a  and the contacting main body  10111  of the adjacent signal terminal  101   a  to be equal to the distance between the contacting elastic piece  10112  of each of the signal terminals  101   a  and the contacting elastic piece  10112  of the adjacent signal terminal  101   a  to improve the signal transmission performance of the differential signal pairs. In one embodiment, the joint between the contacting main body  10111  and the contacting elastic piece  10112  of each of the terminals  101  comprises a first tapering part  10113 , which allows the contacting main body  10111  to be connected with the contacting elastic piece  10112  without obstruction. 
     In one embodiment, the contacting elastic piece  10112  of each of the terminals  101  comprises an elastic piece main body  10114  and a contacting bump  10115 . The elastic piece main body  10114  is connected with the contacting main body  10111 . The contacting bump  10115  is connected with one end of the elastic piece main body  10114  away from the contacting main body  10111  and protrudes in a direction away from the contacting main body  10111 . The width of the elastic piece main body  10114  of each of the signal terminals  101   a  in the second direction Y is greater than the width of the contacting bump  10115  of each of the signal terminals  101   a  in the second direction Y. The width of the elastic piece main body  10114  of each of the ground terminals  101   b  in the second direction Y is equal to the width of the contacting bump  10115  of each of the ground terminals  101   b  in the second direction Y. The contacting bump  10115  of each of the signal terminals  101   a  and the contacting bump  10115  of each of the ground terminals  101   b  correspond to a plurality of contacting pads of the mating connector to ensure that each of the terminals  101  can be effectively connected with the mating connector. In this embodiment, the joint between the elastic piece main body  10114  and the contacting bump  10115  of each of the signal terminals  101   a  further comprises a second tapering part  10116 , which allows the elastic piece main body  10114  to be connected with the contacting bump  10115  without obstruction. 
     In this embodiment, the contacting end part  1011  of each of the ground terminals  101   b  further comprises an opening groove  10117 . The opening groove  10117  is provided at the contacting main body  10111  and at the contacting elastic piece  10112  and extends along the first direction X. One end of the opening groove  10117  penetrates one end of the contacting end part  1011  away from the connecting part  1013 , dividing the contacting bump  10115  into two sub-contacting bumps  10115   a . The width of each of the sub-contacting bumps  10115   a  in the second direction Y is equal to the width of the contacting bump  10115  of each of the signal terminals  101   a , so that the contacting bump  10115  of each of the ground terminals  101   b  can be quite elastic to connect with the ground conductive pad of the mating connector by direct contacting or by correspondingly arranged then mutually closed to. 
     As the configuration of each of the terminals  101  comprises been described above, the configuration of the insulating body  102  would be illustrated below. Referring to  FIG.  5    and  FIG.  10   , a cross-sectional view along line A-A′ of  FIG.  4   , the insulating body  102  is disposed at the plurality of terminals  101  and covers the connecting end part  1012  and the connecting part  1013  of each of the terminals  101 . The contacting end part  1011  of each of the terminals  101  penetrates from one side of the insulating body  102  in the first direction X. The insulating body  102  comprises a first insulator  102   a  and a second insulator  102   b . The second insulator  102   b  is disposed at one side of the first insulator  102   a . The first insulator  102   a  extends along the third direction Z, and the second insulator  102   b  extends along the first direction X. The first insulator  102   a  covers the connecting part  1013  of each of the terminals  101 . The contacting end part  1011  of each of the terminals  101  penetrates from one side of the first insulator  102   a  away from the second insulator  102   b.    
       FIG.  11    is another exploded view of the first terminal assembly of the first embodiment of the present disclosure. In this embodiment, as shown in the figure, the insulating body  102  comprises a first surface  1021 , a second surface  1022 , a third surface  1023 , and a fourth surface  1024 . The first surface  1021  and the second surface  1022  are oppositely disposed in the third direction Z, and the first surface  1021  is disposed on the first insulator  102   a  and the second insulator  102   b , which indicates that an upper surface of the first insulator  102   a  and an upper surface of the second insulator  102   b  belong to the first surface  1021 . The second surface  1022  is disposed on the second insulator  102   b , which indicates that a lower surface of the second insulator  102   b  belongs to the second surface  1022 . The third surface  1023  is in the third direction Z and is disposed at one side of the second surface  1022  away from the first surface  1021 . The second surface  1022  is disposed between the first surface  1021  and the third surface  1023 , and the third surface  1023  is disposed on the first insulator  102   a . That is, the lower surface of the first insulator  102   a  belongs to the third surface  1023 . The fourth surface  1024  is disposed between the first surface  1021  and the third surface  1023  and is a surface of the first insulator  102   a  away from the second insulator  102   b.    
     In this embodiment, the first surface  1021  of the insulating body  102  comprises a plurality of signal connecting parts  10211  and a plurality of first ground connecting parts  10212 . The plurality of signal connecting parts  10211  and the plurality of first ground connecting parts  10212  are alternately arranged in a row along the second direction Y. Two connecting end parts  1012  of two adjacent signal terminals  101   a  are disposed in the corresponding signal connecting parts  10211 . A surface of the cable connecting body  10122  of the connecting end part  1012  of each of the signal terminals  101   a  in the third direction Z is exposed from the signal connecting part  10211  for the two signal lines  111  of the cable  11  to be connected with the corresponding cable connecting bodies  10122 . The connecting end part  1012  of each of the ground terminals  101   b  is disposed in the corresponding first ground connecting part  10212 . The connecting end part  1012  of each of the ground terminals  101   b  is exposed from the first ground connecting part  10212 . 
     In this embodiment, the second surface  1022  of the insulating body  102  further comprises a plurality of second ground connecting parts  10221 . The plurality of second ground connecting parts  10221  are arranged along the second direction Y at intervals, and respectively correspond to the plurality of first ground connecting parts  10212 . The connecting end part  1012  of each of the ground terminals  101   b  is disposed in the corresponding second ground connecting part  10221  and is exposed from the second ground connecting part  10221 . 
     In this embodiment, the first terminal assembly further comprises a first electromagnetic shielding member  103  and a second electromagnetic shielding member  104 . The first electromagnetic shielding member  103  and the second electromagnetic shielding member  104  are respectively disposed on the insulating body  102 . The first electromagnetic shielding member  103  is connected with a surface of the connecting end part  1012  of the ground terminal  101   b  exposed from each of the first ground connecting parts  10212 . The second electromagnetic shielding member  104  is connected with a surface of the connecting end part  1012  of the ground terminal  101   b  exposed from each of the second ground connecting parts  10221 . The first electromagnetic shielding member  103  can be connected with the surface of the connecting end part  1012  of the ground terminal  101   b  exposed from each of the first ground connecting parts  10212  by direct contacting or by correspondingly arranged then mutually closed to. Similarly, the second electromagnetic shielding member  104  can be connected with the surface of the connecting end part  1012  of the ground terminal  101   b  exposed from each of the second ground connecting parts  10221  by direct contacting or by correspondingly arranged then mutually closed to. 
     In this embodiment, the first electromagnetic shielding member  103  is disposed on the first surface  1021  and the fourth surface  1024 , and the second electromagnetic shielding member  104  is disposed on the second surface  1022  and the third surface  1023 . The first electromagnetic shielding member  103  is disposed above the insulating body  102 , and the second electromagnetic shielding member  104  is disposed below the insulating body  102 . A surface of the first electromagnetic shielding member  103  corresponding to the first surface  1021  comprises a plurality of first contacting bumps  1031  arranged at intervals. The plurality of first contacting bumps  1031  are respectively connected with the connecting end part  1012  of the ground terminal  101   b  of the corresponding first ground connecting part  10212 . Specifically, the plurality of first contacting bumps  1031  are respectively connected with the connecting end part  1012  of the ground terminal  101   b  of the corresponding first ground connection part  10212  by direct contacting or by correspondingly arranged then mutually closed to. A surface of the second electromagnetic shielding member  104  corresponding to the second surface  1022  comprises a plurality of second contacting bumps  1041  arranged at intervals. The plurality of second contacting bumps  1041  are respectively connected with the connecting end part  1012  of the ground terminal  101   b  of the corresponding second ground connecting part  10221 . Specifically, the plurality of second contacting bumps  1041  are respectively connected with the connecting end part  1012  of the ground terminal  101   b  of the corresponding second ground connecting part  10221  by direct contacting or by correspondingly arranged then mutually closed to.  FIG.  12    is a schematic diagram showing the connection between the first terminal assembly and the cable of the first embodiment of the present disclosure. As shown in the figure, the ground line  112  of each of the cables  11  is directly connected with the first electromagnetic shielding member  103  to be electrically connected to a plurality of ground terminals  101   b . Specifically, the ground line  112  protrudes from the first electromagnetic shielding member  103  and is connected with an outer surface of the first electromagnetic shielding member  103 . In this embodiment, a surface of the first electromagnetic shielding member  103  in the third direction Z further comprises a plurality of wiring notches  1032 . The plurality of wiring notches  1032  are disposed along the second direction Y at intervals. Each of the wiring notches  1032  is disposed between two adjacent first contacting bumps  1031 . The plurality of wiring notches  1032  respectively correspond to the plurality of signal connecting parts  10211 . In this way, the ground line  112  of each of the cables  11  could pass through the corresponding wiring notch  1032  to protrude from the first electromagnetic shielding member  103 , and the ground line  112  can be connected with the outer surface of the first electromagnetic shielding member  103 . 
     In one embodiment, the surface of the first electromagnetic shielding member  103  in the third direction Z further comprises a plurality of first positioning elastic pieces  1033 , each of which is disposed between two adjacent first contacting bumps  1031  and extends toward the insulating body  102 . The plurality of first positioning elastic pieces  1033  respectively correspond to the plurality of signal connecting parts  10211 . The surface of the second electromagnetic shielding member  104  in the third direction Z further comprises a plurality of second positioning elastic pieces  1042 , each of which is disposed between two adjacent second contacting bumps  1041  and extends toward the insulating body  102 . The plurality of second positioning elastic pieces  1042  respectively correspond to the plurality of signal connecting parts  10211 . When each of the cables  11  is disposed between the first electromagnetic shielding member  103  and the second electromagnetic shielding member  104 , the first positioning elastic piece  1033  and the second positioning elastic piece  1042  would abut against the surface of the cable  11  to secure the cable  11  to the first electromagnetic shielding member  103  and to the second electromagnetic shielding member  104 , so that the cable  11  would not be easily detached from the first electromagnetic shielding member  103  and nor the second electromagnetic shielding member  104 , and would not be detached from the plurality of the terminals  101 . In other embodiments, the above-mentioned effects can also be achieved even the plurality of first positioning elastic pieces  1033  or the plurality of second positioning elastic pieces  1042  is omitted, which would not be repeated herein. 
     In one embodiment, the surface of the first electromagnetic shielding member  103  in the third direction Z further comprises a plurality of cable accommodating bumps  1034 , which are arranged along the second direction Y at intervals. Each of the cable accommodating bumps  1034  is disposed between two adjacent first contacting bumps  1031 . The protruding direction of the first contacting bump  1031  is opposite to the protruding direction of the cable accommodating bump  1034 . In other words, the first contacting bump  1031  protrudes in a direction closing to the insulating body  102 , and the cable accommodating bump  1034  protrudes in a direction away from the insulating body  102 . In this embodiment, the plurality of wiring notches  1032  and the plurality of first positioning elastic pieces  1033  are respectively disposed on a surface of the corresponding cable accommodating bump  1034  in the third direction Z. That is, each of the cable accommodating bumps  1034  comprises a wiring notch  1032  and a first positioning elastic piece  1033 . 
     The plurality of cable accommodating bumps  1034  respectively correspond to the plurality of signal connecting parts  10211 . An accommodating space exists between each of the cable accommodating bumps  1034  and the corresponding signal connecting part  10211 . Two signal lines  111  of each of the cables  11  could enter the accommodating space and are respectively connected with two signal terminals  101   a  exposed from the signal connecting part  10211  to keep the first electromagnetic shielding member  103  from contacting with the two signal lines  111  of each of the cables  11 . 
     In this embodiment, the first surface  1021  of the insulating body  102  further comprises a plurality of third ground connecting parts  10213 . The plurality of third ground connecting parts  10213  are disposed in a row along the second direction Y at intervals and are disposed on one side of the plurality of first ground connecting parts  10212  close to the plurality of contacting end parts  1011  of the plurality of terminals  101 , as shown in  FIG.  10   , the plurality of third ground connecting parts  10213  are disposed on the left side of the plurality of first ground connecting parts  10212 . The plurality of third ground connecting parts  10213  respectively correspond to the plurality of first ground connecting parts  10212 , and one side of the connecting end part  1012  of each of the ground terminals  101   b  close to the contacting end part  1011  is exposed from the corresponding third ground connecting part  10213 . The surface of the first electromagnetic shielding member  103  corresponding to the first surface  1021  further comprises a plurality of third contacting bumps  1035  which are disposed at intervals. The plurality of third contacting bumps  1035  are disposed on one side of the plurality of first contacting bumps  1031 , and are respectively connected with the connecting end part  1012  of the ground terminal  101   b  of the corresponding third ground connecting part  10213 . Specifically, the plurality of third contacting bumps  1035  are respectively connected with the connecting end part  1012  of the ground terminal  101   b  of the corresponding third ground connecting part  10213  by direct contacting or by correspondingly arranged then mutually closed to. 
     In this embodiment, the third surface  1023  of the insulating body  102  further comprises a plurality of fourth ground connecting parts  10231 . The plurality of fourth ground connecting parts  10231  are arranged in a row along the second direction Y at intervals and respectively correspond to the plurality of second ground connecting parts  10221 . The connecting part  1013  of each of the ground terminals  101   b  is exposed from the corresponding fourth ground connecting part  10231 . A surface of the second electromagnetic shielding member  104  corresponding to the third surface  1023  comprises a plurality of fourth contacting bumps  1043  arranged at intervals. The plurality of fourth contacting bumps  1043  are disposed on one side of the plurality of second contacting bumps  1041 , and are respectively connected with the connecting part  1013  of the ground terminal  101   b  exposed from the corresponding fourth ground connecting part  10231 . Specifically, the plurality of fourth contacting bumps  1043  are respectively connected with the connecting part  1013  of the ground terminal  101   b  exposed from the corresponding fourth ground connecting part  10231  by direct contacting or by correspondingly arranged then mutually closed to. 
     In this embodiment, the fourth surface  1024  of the insulating body  102  further comprises a plurality of fifth ground connecting parts  10241 . The plurality of fifth ground connecting parts  10241  are arranged in a row along the second direction Y at intervals and respectively correspond to the plurality of third ground connecting parts  10213 . The connecting body  10131  of the connecting part  1013  of each of the ground terminals  101   b  is exposed from the corresponding fifth ground connecting part  10241 . A surface of the first electromagnetic shielding member  103  corresponding to the fourth surface  1024  further comprises a plurality of fifth contacting bumps  1036  arranged at intervals. The plurality of fifth contacting bumps  1036  are disposed on one side of the plurality of third contacting bumps  1035  and are respectively connected with the connecting part  1013  of the ground terminal  101   b  exposed from the corresponding fifth ground connecting part  10241 . Specifically, the plurality of fifth contact bumps  1036  are respectively connected with the connecting part  1013  of the ground terminal  101   b  exposed from the corresponding fifth ground connecting part  10241  by direct contacting or by correspondingly arranged then mutually closed to. In this embodiment, each of the fifth ground connecting parts  10241  is respectively communicating with the corresponding third ground connecting part  10213 . 
     Thus, by providing the third ground connecting part  10213 , the fourth ground connecting part  10231 , and the fifth ground connecting part  10241 , the exposed area of the ground terminal  101   b  from the insulating body  102  can be increased, and by providing the third contacting bump  1035  and the fifth contacting bump  1036  on the first electromagnetic shielding member  103  and providing the fourth contacting bump  1043  on the second electromagnetic shielding member  104 , the area where the first electromagnetic shielding member  103  and the second electromagnetic shielding member  104  are connected with the ground terminal  101   b  can be increased. In this way, the electromagnetic shielding performance of the first electromagnetic shielding member  103  and the second electromagnetic shielding member  104  can be improved, allowing the first electromagnetic shielding member  103  and the second electromagnetic shielding member  104  to keep the two signal terminals  101   a  of each of the differential signal pairs from being electromagnetically interfered from external and to avoid mutual interference between adjacent two differential signal pairs. 
     In one embodiment, the second electromagnetic shielding member  104  further comprises a shielding body  1044  and a plurality of ground elastic pieces  1045 . The plurality of second contacting bumps  1041  and the plurality of fourth contacting bumps  1043  are disposed on the shielding body  1044 . The plurality of ground elastic pieces  1045  are disposed along the second direction Y at intervals at one end of the shielding body  1044  in the first direction X and are disposed at one side of the shielding body  1044  in the third direction Z. The plurality of ground elastic pieces  1045  extend in a direction close to the connecting end part  1012  of each of the terminals  101 . In this embodiment, the plurality of ground elastic pieces  1045  are disposed under the shielding body  1044 . One end of each of the ground elastic pieces  1045  is connected with one end of the shielding body  1044  in the first direction X. Each of the ground elastic pieces  1045  is inclined to the shielding body  1044 . An angle is formed between each of the ground elastic pieces  1045  and the shielding body  1044 , and the angle is smaller than 90 degrees. In this embodiment, two ground elastic pieces  1045  are provided between two adjacent fourth contacting bumps  1043 . Each of the ground elastic pieces  1045  corresponds to a gap between the adjacent signal terminal  101   a  and the ground terminal  101   b . In this embodiment, the plurality of ground elastic pieces  1045  of the second electromagnetic shielding member  104  are connected with a shielding ground conductive pad of the mating connector. 
     In one embodiment, two opposite sides of the insulating body  102  in the second direction Y are respectively provided with a first buckling part  1025  and a second buckling part  1026 . Two opposite sides of the first electromagnetic shielding member  103  in the second direction Y are respectively provided with a third buckling part  1037 . The third buckling part  1037  engages with the corresponding first buckling part  1025  to position the first electromagnetic shielding member  103  on the insulating body  102 . Two opposite sides of the second electromagnetic shielding member  104  in the second direction Y are respectively provided with a fourth buckling part  1046 . Each of the fourth buckling parts  1046  is buckled with the corresponding second buckling part  1026  to position the second electromagnetic shielding member  104  on the insulating body  102 . Specifically, each of the first buckling parts  1025  and each of the second buckling parts  1026  are respectively a bump. Each of the first buckling parts  1025  and each of the second buckling parts  1026  extend along the third direction Z. Each of the third buckling parts  1037  and each of the fourth buckling parts  1046  are respectively a recess. In this embodiment, the first electromagnetic shielding member  103  and the second electromagnetic shielding member  104  are made of conductive materials, such as conductive plastic, metal, or electroplated plastic. 
       FIG.  13    is a perspective view of a second terminal assembly of the first embodiment of the present disclosure.  FIG.  14    is a cross-sectional view along line B-B′ of  FIG.  13   . As shown in the figures, the second terminal assembly  10   b  of this embodiment is different from the first terminal assembly  10   a  in that the height difference between the connecting end part  1012  of each of the terminals  101  of the second terminal assembly  10   b  and the contacting end part  1011  is smaller than the height difference between the connecting end part  1012  of each of the terminals  101  of the first terminal assembly  10   a  and the contacting end part  1011 . Thus, the first insulator  102   a  of the insulating body  102  of the first terminal assembly  10   a  is omitted in the insulating body  102  of second terminal assembly  10   b , which also indicates that the insulating body  102  is flat-shaped and the insulating body  102  directly covers the connecting end part  1012  and the connecting part  1013  of each of the terminals  101 . In this embodiment, the plurality of fifth ground connecting parts  10241  of the insulating body  102  of the first terminal assembly  10   a  are also omitted in the insulating body  102  of second terminal assembly  10   b , and the fifth contacting bumps  1036  of the first electromagnetic shielding member  103  of the first terminal assembly  10   a  are also omitted in the first electromagnetic shielding member  103  of the second terminal assembly  10   b . Except for the above differences, the rest of the configurations of the second terminal assembly  10   b  are substantially the same as those of the first terminal assembly  10   a . The method to assemble the cable  11  to the second terminal assembly  10   b  is the same as the method to assemble the cable  11  to the first terminal assembly  10   a , which would not be repeated herein. 
     Referring to  FIG.  3    again, the electrical connector  1  further comprises two insulative protection members  13  respectively disposed at the joint between each of the terminal assemblies  10  and the plurality of cables  11 , so that the plurality of cables  11  can be stably connected with the corresponding terminal assembly  10  to keep external aqueous vapor or pollutants from corroding the joint between the plurality of cables  11  and the terminal assembly  10 . When each of the terminal assemblies  10  is connected with the plurality of cables  11 , the insulative protection member  13  can be formed at the joint between the terminal assembly  10  and the plurality of cables  11  by injection molding. 
     Referring to  FIG.  2    again, the first terminal assembly  10   a  and the second terminal assembly  10   b  respectively provided with the plurality of cables  11  and the insulative protection member  13  are then respectively disposed in the corresponding accommodating groove  121 . When the first terminal assembly  10   a  and the second terminal assembly  10   b  are respectively disposed in the corresponding accommodating groove  121 , the contacting elastic piece  10112  of the contacting end part  1011  of each of the terminals  101  of each of the terminal assemblies  10  would protrude from the housing  12  through the corresponding terminal through hole  122 , and the plurality of ground elastic pieces  1045  of the second electromagnetic shielding member  104  of each of the terminal assemblies  10  would protrude from the housing  12 . Specifically, the housing  12  of this embodiment further comprises a plurality of ground through holes  124  respectively provided on a bottom surface of the corresponding accommodating groove  121 . The plurality of ground through holes  124  in each of the accommodating grooves  121  are disposed on the bottom surface of the accommodating groove  121  at intervals along the second direction Y, and penetrate the housing  12  along the third direction Z. In this embodiment, each of the ground through holes  124  is elongated, that is, the ground through hole  124  extends along the first direction X. When the terminal assembly  10  is disposed in the corresponding accommodating groove  121 , the plurality of ground elastic pieces  1045  would respectively protrude from the housing  12  through the corresponding ground through hole  124 . 
     In this embodiment, when the first terminal assembly  10   a  and the second terminal assembly  10   b  are respectively disposed in the corresponding accommodating groove  121 , the first terminal assembly  10   a  would be disposed above the second terminal assembly  10   b , the plurality of cables  11  connected with the first terminal assembly  10   a  would pass through the upper area of the second terminal assembly  10   b , and the plurality of cables  11  connected with the first terminal assembly  10   a  and the plurality of cables  11  connected with the second terminal assembly  10   b  would pass through the wiring opening  123  of the housing  12 . The second electromagnetic shielding member  104  of the first terminal assembly  10   a  is connected with the first electromagnetic shielding member  103  of the second terminal assembly  10   b  to connect the plurality of ground terminals  101   b  of the first terminal assembly  10   a  and the plurality of ground terminals  101   b  of the second terminal assembly  10   b  in series. In this way, the crosstalk between the two terminal assemblies  10  of the electrical connector  1  during signal transmission can be avoided to improve signal transmission performance of the electrical connector  1 . The second electromagnetic shielding member  104  of the first terminal assembly  10   a  and the first electromagnetic shielding member  103  of the second terminal assembly  10   b  can also be connected through a conductor to perform the above-mentioned effect. In other embodiments, the second electromagnetic shielding member  104  of the first terminal assembly  10   a  may not be connected to the first electromagnetic shielding member  103  of the second terminal assembly  10   b , which would not be repeated herein. 
     In one embodiment, two opposite sides of the insulating body  102  in the second direction Y of each of the terminal assemblies  10  respectively comprise a first positioning part  1027 . Two opposite sides of each of the accommodating grooves  121  in the second direction Y respectively comprise a second positioning part  1211 . When each of the terminal assemblies  10  is disposed in the corresponding accommodating groove  121 , each of the first positioning parts  1027  of the insulating body  102  would be connected with the corresponding second positioning part  1211  to position each of the terminal assemblies  10  in the corresponding accommodating groove  121 . Specifically, the first positioning part  1027  is a dovetail bump and protrudes in the second direction Y. The second positioning part  1211  is a dovetail groove. 
     Referring to  FIG.  1    again, in this embodiment, the electrical connector  1  further comprises a metal cover  14 . The metal cover  14  is disposed on the housing  12  and covers the two terminal assemblies  10 . The housing  12  comprises a first side surface  12   a  and two second side surfaces  12   b . The first side surface  12   a  is in the first direction X and is opposite to the wiring opening  123 . The two second side surfaces  12   b  are oppositely disposed in the second direction Y. The metal cover  14  comprises a first sidewall  14   a  and two second sidewalls  14   b . The first sidewall  14   a  is in the first direction X. The two second sidewalls  14   b  are oppositely disposed in the second direction Y. When the metal cover  14  is disposed on the housing  12 , the first sidewall  14   a  would correspond to the first side surface  12   a , and the two second sidewalls  14   b  would correspond to the two second side surfaces  12   b , respectively. In this embodiment, an end surface of the first sidewall  14   a  and the two second sidewalls  14   b  of the metal cover  14  close to the bottom surface of the housing  12  is coplanar with the bottom surface of the housing  12 . 
     In one embodiment, the housing  12  comprises a plurality of first engaging parts  1212  respectively disposed on the peripheries of the two accommodating grooves  121 . The metal cover  14  further comprises a plurality of second engaging parts  141 . When the metal cover  14  is disposed on the housing  12 , each of the first engaging parts  1212  would be engaged with the corresponding second engaging part  141 . In this embodiment, the first engaging part  1212  is a bump and extends toward the metal cover  14 . The second engaging part  141  is a hole. In other embodiments, the first engaging part  1212  is a hot-melt column. When the first engaging part  1212  is engaged with the second engaging part  141 , the first engaging part  1212  is heated to melt, and the second engaging part  141  is sealed to secure the metal plate  14  onto the housing  12 . The first side surface  12   a  of the housing  12  further comprises a third engaging part  1213  comprising a plurality of engaging blocks  12131  disposed at intervals. The first sidewall  14   a  of the metal cover  14  comprises a fourth engaging part  142  comprising a plurality of engaging notches  1421 . A rib  1422  is provided between two adjacent engaging notches  1421 . When the metal cover  14  is disposed on the housing  12 , each of the engaging blocks  12131  would be disposed in the corresponding engaging notch  1421 , and each of the ribs  1422  would be disposed between two adjacent engaging blocks  12131  to position the metal cover  14  on the housing  12 . In this embodiment, each of the engaging blocks  12131  is disposed between two adjacent ground terminals  101   b , each of the ribs  1422  corresponds to the ground terminal  101   b , and an end surface of each of the ribs  1422  close to the bottom surface of the housing  12  is coplanar with the bottom surface of the housing  12 . 
     Referring to  FIG.  3    again, in this embodiment, the electrical connector  1  further comprises an insulative covering body  15 . The insulative covering body  15  is disposed between the housing  12  and the metal cover  14  and covers the two terminal assemblies  10 . The insulative covering body  15  separates the two terminal assemblies  10  and the metal cover  14  to prevent the metal cover  14  from contacting with the two terminal assemblies  10 . The metal cover  14  further comprises a plurality of through holes  143 . When the metal cover plate  14  is disposed on the housing  12 , an insulative plastic would be poured into a space between the two terminal assemblies  10  and the metal cover  14  through the through hole  143 . In one embodiment, the insulative plastic could be poured into the space between the two terminal assemblies  10  and the metal cover  14  through the wiring opening  123  of the housing  12 . When the insulative plastic comprises solidified, the insulative covering body  15  would be formed between the two terminal assemblies  10  and the metal cover  14 . 
     In this embodiment, the electrical connector further comprises a sideboard  16 . The sideboard  16  is disposed on the housing  12  and on the metal cover plate  14  and covers the wiring opening  123 . The sideboard  16  is formed by pouring insulative plastic into a fixture, indicating that the sideboard  16  covers the plurality of cables  11 . An end surface of the sideboard  16  close to the bottom surface of the housing  12  is coplanar with the bottom surface of the housing  12 . 
       FIG.  15    is a use state diagram of the electrical connector of the first embodiment of the present disclosure.  FIG.  16    is a schematic diagram of a mating connector of the first embodiment of the present disclosure. As shown in the figures, the electrical connector  1  of the above embodiment is a cable connector. When the electrical connector  1  of this embodiment is in use, the electrical connector  1  would be mated with a mating connector (electrical connector). In this embodiment, the mating connector (electrical connector)  2  comprises a circuit board  20 . A surface of the circuit board  20  comprises two electrical connecting areas  20   a . Since the two terminal assemblies  10  of the electrical connector  1  are electrically connected with the corresponding electrical connecting area  20   a  respectively, the two electrical connecting areas  20   a  of this embodiment are disposed on a surface where the circuit board  20  and the electrical connector  1  mate along the first direction X. Each of the electrical connecting areas  20   a  comprises a plurality of ground conductive pads  21 , a plurality of signal conductive pads  22 , and a plurality of shielding ground conductive pads  23 . The plurality of ground conductive pads  21  and the plurality of signal conductive pads  22  are arranged in a row at intervals along the second direction Y. The plurality of ground conductive pads  21  and the plurality of signal conductive pads  22  are alternately arranged. At least one signal conductive pad  22  is provided between two adjacent ground conductive pads  21 . In this embodiment, two signal conductive pads  22  are provided between two adjacent ground conductive pads  21 . The plurality of ground conductive pads  21  respectively correspond to the plurality of contacting elastic pieces of the plurality of ground terminals of the terminal assembly. The plurality of signal conductive pads  22  respectively correspond to the plurality of contacting elastic pieces of the plurality of signal terminals of the terminal assembly. In this way, the distance between a centerline of each of the signal conductive pads  22  and a centerline of the adjacent ground conductive pad  21  is greater than the distance between the centerline of each of the signal conductive pads  22  and the centerline of the adjacent signal conductive pad  22 . The width of each of the ground conductive pads  21  in the second direction Y is wider than the width of each of the signal conductive pads  22  in the second direction Y. The plurality of shielding ground conductive pads  23  are arranged in a row at intervals along the second direction Y and are disposed on one side of the plurality of ground conductive pads  21  and the plurality of signal conductive pads  22  which are arranged in a row. Each of the shielding ground conductive pads  23  corresponds to the plurality of ground elastic pieces of each of the second electromagnetic shielding members. Each of the shielding ground conductive pads  23  corresponds to a gap between the adjacent ground conductive pad  21  and the signal conductive pad  22 . 
     When the electrical connector  1  is connected to the circuit board  20  of the mating connector  2 , an end surface of the housing  12 , an end surface of the metal cover  14 , and an end surface of the sideboard  16  of the electrical connector  1  would be in contact with a surface of the circuit board  20 . The contacting elastic piece of each of the signal terminals of each of the terminal assemblies of the electrical connector  1  is connected with the corresponding signal conductive pad  22 . The contacting elastic piece  10112  of each of the ground terminals  101   b  is connected with the corresponding ground conductive pad  21 . The ground elastic piece  1045  of the second electromagnetic shielding member  104  is connected with the corresponding shielding ground conductive pad  23 . The connection described above refers to contact connection or non-contact connection. In this embodiment, the circuit board  20  surrounds the two signal conductive pads  21  through two ground conductive pads  21  and two shielding ground conductive pads  23 . When each of the ground conductive pads  21  is connected to the corresponding ground terminal and when the two shielding ground conductive pads  23  are connected to the corresponding second electromagnetic shielding member  104 , the two grounding conductive pads  21  and the two shielding ground conductive pads  23  would be grounded to reduce the interference from external electromagnetic to the signal transmission between the signal terminal and the circuit board  20 , and to prevent two adjacent differential signal pairs from interfering with the circuit board  20  during signal transmission. In this way, the electromagnetic shielding performance between the circuit board  20  and the electrical connector  1  can be improved, performing excellent signal transmission between the circuit board  20  and the electrical connector  1 . 
       FIG.  17    is a schematic diagram of a mating connector of the second embodiment of the present disclosure. As shown in the figure, the mating connector  2  of this embodiment is different from that of the first embodiment in that the mating connector  2  comprises only one shielding ground conductive pad  23  extending in a second direction Y. That is, the plurality of shielding ground conductive pads of the circuit board of the first embodiment are connected in series, and the shielding ground conductive pad  23  corresponds to a plurality of ground elastic pieces. In this embodiment, two adjacent signal conductive pads  22  are disposed between two adjacent ground conductive pads  21  and the shielding ground conductive pad  23  to increase the range that the two adjacent ground conductive pads  21  and the shielding ground conductive pad  23  surround the two adjacent signal conductive pads  22 . Thus, the electromagnetic shielding performance between the circuit board  20  and the electrical connector can be improved, performing excellent signal transmission between the circuit board  20  and the electrical connector. 
       FIG.  18    is a schematic diagram of a mating connector of the third embodiment of the present disclosure. As shown in the figure, the mating connector  2  of this embodiment is different from that of the first embodiment in that the plurality of ground conductive pads  21  of the circuit board  20  are connected in series. Specifically, the circuit board  20  of this embodiment further comprises a plurality of first conductive connecting pads  24  disposed on a surface of the electrical connecting area  20   a  of the circuit board  20 . Two ends of each of the first conductive connecting pads  24  are respectively connected with the corresponding ground conductive pad  21 . One ends of two adjacent first conductive connecting pads  24  are connected with the same ground conductive pad  21 . Each of the first conductive connecting pads  24  is disposed on one side of each of the signal conductive pads  22  away from the shielding ground conductive pad  23 . The gap between the two ends of each of the first conductive connecting pads  24  corresponds to at least one signal conductive pad  22 . In this embodiment, two ends of each of the first conductive connecting pads  24  are connected with two adjacent ground conductive pads  21 . The gap between two ends of each of the first conductive connecting pads  24  corresponds to two signal conductive pads  22  and is disposed on one side of the two signal conductive pads  22  between two adjacent ground conductive pads  21  away from the shielding ground conductive pad  23 . The plurality of first conductive connecting pads  24  are arranged along the second direction Y, wherein one ends of two adjacent first conductive connecting pads  24  are connected with the same ground conductive pad  21 . In this way, the plurality of ground conductive pads  21  can be interconnected through the plurality of first conductive connecting pads  24 . 
     In this embodiment, the first conductive connecting pad  24  comprises a first connecting body  241  and two second connecting bodies  242 . The first connecting body  241  extends along the second direction Y, and the two second connecting bodies  242  are respectively disposed at two opposite ends of the two first connecting bodies  241  in the second direction Y. The two second connecting bodies  242  extend along the first direction X and are respectively connected with the corresponding shielding ground conductive pad  23 . In this embodiment, two adjacent signal conductive pads  22  are disposed between the two adjacent ground conductive pads  21 , the first conductive connecting pad  24 , and the shielding ground conductive pad  23  to increase the range that the two adjacent ground conductive pads  21 , the first conductive connecting pad  24 , and the shielding ground conductive pad  23  surround the two adjacent signal conductive pads  22 . In this way, the electromagnetic shielding between the electrical connector and the circuit board  20  can be improved, performing excellent signal transmission between the circuit board  20  and the electrical connector. In this embodiment, the plurality of first conductive connecting pads  24  are connected in series. Thus, each of the second connecting bodies  242  of each of the first conductive connecting pads  24  is connected with the second connecting body  242  of the adjacent first conductive connecting pad  24 . The plurality of first connecting bodies  241  are interconnected. 
       FIG.  19    is a schematic diagram of a mating connector of the fourth embodiment of the present disclosure. As shown in the figure, the mating connector  2  of this embodiment is different from that of the second embodiment in that the plurality of ground conductive pads  21  respectively extend toward the shielding ground conductive pad  23  and are connected with the shielding ground conductive pad  23 . Two adjacent ground conductive pads  21  and the shielding ground conductive pad  23  form a U-shaped semi-open area. Two signal conductive pads  22  between two adjacent ground conductive pads  21  are disposed in the U-shaped semi-open area to increase the range that the two adjacent ground conductive pads  21  and the shielding ground conductive pad  23  surround two adjacent signal conductive pads  22 . Thus, the electromagnetic shielding performance between the circuit board  20  and the electrical connector can be improved, performing excellent signal transmission between the circuit board  20  and the electrical connector. In this embodiment, the length of each of the ground conductive pads  21  in the first direction X can be extended to be directly connected to the shielding ground conductive pad  23 . Each of the ground conductive pads  21  can also be connected to the shielding ground conductive pad  23  by connecting with the conductive pad. 
       FIG.  20    is a schematic diagram of a mating connector of the fifth embodiment of the present disclosure. As shown in the figure, the mating connector  2  of this embodiment is different from that of the third embodiment in that each of the ground conductive pads  21  of this embodiment is connected to a shielding ground conductive pad  23  through a second conductive connecting pad  25 . Each of the second conductive connection pads  25  is disposed on a surface of the electrical connecting area  20   a  of the circuit board  20 . Two ends of each of the second conductive connecting pads  25  are respectively connected with the corresponding ground conductive pad  21  and the shielding ground conductive pad  23 . Each of the first conductive connecting pads  24 , two adjacent ground conductive pads  21 , two adjacent second conductive connecting pads  25 , and the shielding ground conductive pad  23  form an enclosed area. The two signal conductive pads  22  between the two adjacent ground conductive pads  21  are disposed in the enclosed area, which improves the electromagnetic shielding between the circuit board  20  and the electrical connector, performing excellent signal transmission between the circuit board  20  and the electrical connector. 
       FIG.  21    is a schematic diagram of a mating connector of the sixth embodiment of the present disclosure. As shown in the figure, the mating connector  2  of this embodiment is different from that of the second embodiment in that the plurality of first conductive connecting pads  24  of one electrical connection area  20   a  are connected with a shielding ground conductive pads  23  of an adjacent electrical connection area  20   a . Specifically, the first connecting body  241  of each of the first conductive connecting pads  24  is connected with the shielding ground conductive pad  23 . In this embodiment, the plurality of conductive pads for grounding of the two electrical connecting areas  20   a  are partially connected. Thus, the electromagnetic shielding performance between the circuit board  20  and the electrical connector can be improved, performing excellent signal transmission between the circuit board  20  and the electrical connector. 
       FIG.  22    is a schematic diagram of a mating connector of the seventh embodiment of the present disclosure. As shown in the figure, the mating connector  2  of this embodiment is different from that of the fifth embodiment in that a plurality of first conductive connecting pads  24  in one electrical connecting area  20   a  are connected with a shielding ground conductive pad  23  of an adjacent electrical connecting area  20   a . Specifically, the first connecting body  241  of each of the first conductive connecting pads  24  is connected to the shielding ground conductive pad  23 . In this embodiment, the plurality of conductive pads for grounding of the two electrical connecting areas  20   a  are integrally connected to be one piece. Thus, the electromagnetic shielding performance between the circuit board  20  and the electrical connector can be improved, performing excellent signal transmission between the circuit board  20  and the electrical connector. 
       FIG.  23    is a schematic diagram of a mating connector of the eighth embodiment of the present disclosure. As shown in the figure, the mating connector  2  of this embodiment is different from that of the seventh embodiment in that the mating connector  2  further comprises a first cover ground conductive pad  26 . The first cover ground conductive pad  26  is disposed on a surface of the circuit board  20  and surrounds the electrical connecting area  20   a . In this embodiment, the first cover ground conductive pad  26  surrounds the two electrical connecting areas  20   a . The first cover ground conductive pad  26  corresponds to a metal cover and a sideboard of the electrical connector, so the first cover ground conductive pad  26  is a framed body. Two ends of the first cover ground conductive pad  26  are respectively connected with the corresponding first conductive connecting pad  24  in an electrical connecting area  20   a , so that the first cover ground conductive pad  26 , a plurality of ground conductive pads  21 , and a plurality of shielding ground conductive pads  23  are connected in series. In this embodiment, when the circuit board  20  is connected to the electrical connector of the first embodiment, a plurality of ground terminals would be connected to a plurality of ground conductive pads  21 . A plurality of ground elastic pieces of each of the second electromagnetic shielding members are connected with the corresponding shielding grounding conductive pad  23 . The metal cover and the sideboard are connected to the first cover ground conductive pad  26 . In this way, any external electromagnetic would be completely blocked without entering the gap between the electrical connector and the circuit board  20 , and the electromagnetic between the electrical connector and the circuit board  20  can also be blocked without being leaked. Thus, when signal is transmitted between the circuit board  20  and the electrical connector, excellent signal transmission would be performed. In this embodiment, the first cover ground conductive pad  26  can be applied to the mating connector of the third embodiment. The first cover ground conductive pad  26  can be only connected with a plurality of ground conductive pads  21  in one of the two electrical connecting areas  20   a  in series. In this embodiment, the first cover ground conductive pad  26  can be applied to the mating connector of the fifth embodiment. The first cover ground conductive pad  26  can be only connected with a plurality of ground conductive pads  21  and a shielding ground conductive pad  23  in one of the two electrical connecting areas  20   a  in series. In this embodiment, the first cover ground conductive pad  26  can be applied to the mating connector of the sixth embodiment. The first cover ground conductive pad  26  can be only connected with a plurality of ground conductive pads  21  in series to integrally form a one piece element. In other words, the first cover ground conductive pad  26  can be optionally connected with a plurality of ground conductive pads  21  or shielding ground conductive pads  23  in series to integrally form a one piece element, or the first cover ground conductive pad  26  can be connected with a plurality of ground conductive pads  21  and a shielding ground conductive pads  23  in series to integrally form a one piece. In other embodiments, the ground conductive pad  26  of the first cover may not be connected with the plurality of ground conductive pads  21  and the plurality of shielding ground conductive pads  23  in series to integrally form a one piece. That is, the first cover ground conductive pad  26  is individually disposed and is not connected with the first conductive connecting pad  24 . 
     In one embodiment, referring to  FIG.  1   , an end surface of each of the ribs  1422  of the metal cover  14  close to the bottom surface of the housing  12  is directly connected to the second connecting body  242  of the corresponding first conductive connecting pad  24 . In other embodiments, the circuit board  20  further comprises a plurality of second cover ground conductive pads  27  respectively disposed on the corresponding second connecting bodies  242 . The end surface of each of the ribs  1422  of the metal cover  14  close to the bottom surface of the housing  12  is directly connected to the corresponding second cover ground conductive pad  27 . The width of each of the second cover ground conductive pads  27  in the second direction Y is wider than the width of the second connecting body  242  in the second direction Y to ensure that the end surface of each of the ribs  1422  of the metal cover  14  close to the bottom surface of the housing  12  can be effectively connected to the corresponding second cover ground conductive pad  27 . In other embodiments, two ends of the first cover ground conductive pad  26  are respectively connected to the corresponding second cover ground conductive pad  27 . 
     In summary, embodiments of the present disclosure provide a terminal assembly and an electrical connector. By increasing the plurality of ground elastic pieces to be disposed on the second electromagnetic shielding member, the plurality of ground elastic pieces can be respectively connected with the ground terminals of a mating connector to avoid crosstalk among the plurality of signal terminals transmitting signals between the electrical connector and the mating connector. Thus, the signal transmission performance of electrical connectors can be effectively improved. 
     It is to be understood that the term “comprises”, “comprising”, or any other variants thereof, is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device of a series of elements not only comprise those elements but further comprises other elements that are not explicitly listed, or elements that are inherent to such a process, method, article, or device. An element defined by the phrase “comprising a . . . ” does not exclude the presence of the same element in the process, method, article, or device that comprises the element. 
     Although the present disclosure has been explained in relation to its preferred embodiment, it does not intend to limit the present disclosure. It will be apparent to those skilled in the art having regard to this present disclosure that other modifications of the exemplary embodiments beyond those embodiments specifically described here may be made without departing from the spirit of the disclosure. Accordingly, such modifications are considered within the scope of the disclosure as limited solely by the appended claims.