Patent Publication Number: US-2023136453-A1

Title: Electrical connector with improved electrical performance

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 17/703,454, filed on Mar. 24, 2022, which is a continuation of U.S. patent application Ser. No. 17/005,053, filed on Aug. 27, 2020, which claims priorities of a Chinese Patent Application No. 202010015943.7, filed on Jan. 7, 2020 and titled “ELECTRICAL CONNECTOR”, a Chinese Patent Application No. 201921494812.0, filed on Sep. 7, 2019 and titled “ELECTRICAL CONNECTOR”, and a Chinese Patent Application No. 201921488180.7, filed on Sep. 7, 2019 and titled “ELECTRICAL CONNECTOR”, the entire content of which is incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an electrical connector, in particular to a high-speed electrical connector for data transmission. 
     BACKGROUND 
     Existing high-speed electrical connectors usually include a plurality of signal terminals and a plurality of ground terminals. The signal terminals are differential signal terminals in some high-speed electrical connectors. In order to reduce the mutual influence of the signal terminals during data transmission and the influence of the external environment, the ground terminals are usually arranged at both sides of each pair of differential signal terminals. 
     Even so, when data is being transmitted at high speed, the signal terminals will still be subject to some interference. In order to further reduce this interference, engineers in the art try to add lossy member to the electrical connector. Experiments show that this has positive significance for reducing signal interference. Lossy member is usually connected with the ground terminal. However, when assembling the lossy member, it is easy to happen that some ground terminals can contact the lossy member, and some ground terminals cannot reliably contact the lossy member. That is, positional relationship between the lossy member and the ground terminal during assembly lacks high consistency, which affects the electrical performance of the electrical connector. 
     SUMMARY 
     An object of the present disclosure is to provide an electrical connector with better electrical performance. 
     In order to achieve the above object, the present disclosure provides an electrical connector comprising an insulating housing, a plurality of terminals and a lossy member. The terminals comprise a plurality of ground terminals and a plurality of signal terminals. The ground terminals and the signal terminals are set adjacently to each other but do not contact each other. The ground terminals do not directly contact the lossy member. 
     Compared with the prior art, by having the lossy member and the ground terminal be not in direct contact, installation consistency of the ground terminals can be achieved, thereby improving the electrical performance of the electrical connector. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of an electrical connector in accordance with a first embodiment of the present disclosure; 
         FIG.  2    is another perspective view of  FIG.  1    from another angle; 
         FIG.  3    is a partially exploded perspective view of  FIG.  1   ; 
         FIG.  4    is a front view of a terminal module in  FIG.  3   ; 
         FIG.  5    is a perspective exploded view of the terminal module in  FIG.  3   ; 
         FIG.  6    is an exploded perspective view of  FIG.  5    from another angle; 
         FIG.  7    is a partial perspective cross-sectional view of a first terminal module in  FIG.  6   ; 
         FIG.  8    is a front view of  FIG.  7   ; 
         FIG.  9    is a partial perspective cross-sectional view of a second terminal module in  FIG.  6   ; 
         FIG.  10    is a front view of  FIG.  9   ; 
         FIG.  11    is a partial perspective cross-sectional view of a third terminal module in  FIG.  6   ; 
         FIG.  12    is a front view of  FIG.  11   ; 
         FIG.  13    is a partial perspective cross-sectional view of a fourth terminal module in  FIG.  6   ; 
         FIG.  14    is a front view of  FIG.  13   ; 
         FIG.  15    is a further exploded perspective view of  FIG.  6   ; 
         FIG.  16    is an exploded perspective view of  FIG.  15    from another angle; 
         FIG.  17    is a further exploded perspective view of  FIG.  15   ; 
         FIG.  18    is an exploded perspective view of  FIG.  17    from another angle; 
         FIG.  19    is a schematic cross-sectional view of the electrical connector along a line A-A in  FIG.  1    in accordance with an embodiment of the present disclosure; 
         FIG.  20    is an exploded perspective view of  FIG.  17    in accordance with a second embodiment of the present disclosure; 
         FIG.  21    is an exploded perspective view of  FIG.  20    from another angle; 
         FIG.  22    is a schematic cross-sectional view of  FIG.  19    in the second embodiment; 
         FIG.  23    is a perspective view of an electrical connector in accordance with a second embodiment of the present disclosure; 
         FIG.  24    is a schematic perspective view of  FIG.  23    from another angle; 
         FIG.  25    is a front view of  FIG.  23   ; 
         FIG.  26    is a rear view of  FIG.  23   ; 
         FIG.  27    is a partially exploded perspective view of  FIG.  23   ; 
         FIG.  28    is a partially exploded perspective view of  FIG.  27    from another angle; 
         FIG.  29    is a schematic cross-sectional view taken along a line B-B in  FIG.  25   ; 
         FIG.  30    is a further perspective exploded view of  FIG.  28   , in which a lossy member is separated; 
         FIG.  31    is a further perspective exploded view of  FIG.  30   , in which a first terminal module and a second terminal module are separated; 
         FIG.  32    is an exploded perspective view of  FIG.  31    from another angle; and 
         FIG.  33    is a perspective view of the lossy member. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIGS.  1  to  4   , the present disclosure discloses an electrical connector  100  which includes an insulating housing  1  and a terminal module  2  assembled to the insulating housing  1 . In an embodiment of the present disclosure, the electrical connector  100  is an SFP board connector. 
     The insulating housing  1  includes a mating surface  11  at a front end, an assembly surface  12  at a rear end and a mounting surface  13  at a bottom end. The insulating housing  1  includes a mating slot  10  extending through the mating surface  11  for mating with a mating connector (not shown). Referring to  FIG.  3   , the insulating housing  1  includes a receiving space  14  which extends through the assembly surface  12  and is used to receive the terminal module  2 . Opposite side walls of the insulating housing  1  are respectively provided with a plurality of guide grooves  15  for guiding and fixing the terminal module  2 . The guide groove  15  on each side wall of the insulating housing includes a first guide groove  151 , a second guide groove  152 , a third guide groove  153  and a fourth guide groove  154  which are arranged along a top-to-bottom direction. The mounting surface  13  is used to mount the electrical connector  100  on a circuit board (not shown). 
     Referring to  FIGS.  5  to  19   , in a first illustrated embodiment of the present disclosure, the terminal module  2  includes a first terminal module  3 , a second terminal module  4 , a third terminal module  5  and a fourth terminal module  6 , in which the first terminal module  3  and the fourth terminal module  6  are arranged oppositely, and the second terminal module  4  and the third terminal module  5  are arranged oppositely. 
     The first terminal module  3  includes a first insulating block  31 , a plurality of first terminals  32  disposed in the first insulating block  31 , a first lossy member  33  mating with at least some of the first terminals  32 , and a first non-conductive layer  34  located between the first terminals  32  and the first lossy member  33 . In one embodiment of the present disclosure, the first terminals  32  are insert-molded with the first insulating block  31 . It can be understood that, in other embodiments, the first terminals  32  may also be fixed to the first insulating block  31  by assembling. The electrical connector  100  includes a first isolation portion which is a polymer material in some embodiments. The first isolation portion includes the first non-conductive layer  34 . 
     The first insulating block  31  includes a first protrusion  311  on each side thereof. The first protrusions  311  are used to be inserted into the first guide grooves  151  to assemble and positon the first terminal module  3 . Referring to  FIG.  18   , the first insulating block  31  further includes a first opening slot  312  for receiving the first lossy member  33  and first locking slots  313  located at both ends of the first opening slot  312 . 
     From a structural point of view, each first terminal  32  is provided with a first elastic arm  321  extending toward the mating slot  10 , a first tail portion  322  for being mounted on the circuit board, and a first connection portion  323  connecting the first elastic arm  321  and the first tail portion  322 . The first elastic arm  321  is provided with a first contact portion  3211  protruding into the mating slot  10 . The first terminals  32  are supported by the insulating housing  1 . In the illustrated embodiment of the present disclosure, the first terminals  32  are supported by the insulating housing  1  via the first insulating block  31 . However, in other embodiments, the first terminals  32  can be supported by the insulating housing  1  directly through mounting features. 
     Referring to  FIGS.  7  and  8   , from a functional point of view, the first terminals  32  include at least two first ground terminals G 1  spaced apart from each other and a plurality of first signal terminals S 1  located between the two first ground terminals G 1 . The first ground terminals G 1  and the first signal terminals S 1  are disposed along a first direction (i.e., a left-right direction). In the illustrated embodiment of the present disclosure, the first connection portions  323  of the first ground terminals G 1  and the first signal terminals S 1  are exposed in the first opening slot  312 . 
     Referring to  FIGS.  9  and  10   , the second terminal module  4  includes a second insulating block  41 , a plurality of second terminals  42  disposed in the second insulating block  41 , a second lossy member  43  mating with at least some of the second terminals  42 , and a second non-conductive layer  44  located between the second terminals  42  and the second lossy member  43 . In one embodiment of the present disclosure, the second terminals  42  are insert-molded with the second insulating block  41 . It can be understood that, in other embodiments, the second terminal  42  may also be fixed to the second insulating block  41  by assembling. The electrical connector  100  includes a second isolation portion which is a polymer material in some embodiments. The second isolation portion includes the second non-conductive layer  44 . 
     The second insulating block  41  includes a second protrusion  411  on each side thereof. The second protrusions  411  are used to be inserted into the second guide grooves  152  (see  FIG.  3   ) to assemble and positon the second terminal module  4 . Referring to  FIG.  18   , the second insulating block  41  further includes a second opening slot  412  for receiving the second lossy member  43  and second locking slots  413  located at both ends of the second opening slot  412 . 
     From a structural point of view, each second terminal  42  is provided with a second elastic arm  421  extending toward the mating slot  10 , a second tail portion  422  for being mounted on the circuit board, and a second connection portion  423  connecting the second elastic arm  421  and the second tail portion  422 . The second elastic arm  421  is provided with a second contact portion  4211  protruding into the mating slot  10 . The second terminals  42  are supported by the insulating housing  1 . In the illustrated embodiment of the present disclosure, the second terminals  42  are supported by the insulating housing  1  via the second insulating block  41 . However, in other embodiments, the second terminals  42  can be supported by the insulating housing  1  directly through mounting features. 
     Referring to  FIG.  9    and  FIG.  10   , from a functional point of view, the second terminals  42  includes at least two second ground terminals G 2  spaced apart from each other and a plurality of second signal terminals S 2  located between the two second ground terminals G 2 . The second ground terminals G 2  and the second signal terminals S 2  are disposed along the first direction (i.e., the left-right direction). In the illustrated embodiment of the present disclosure, the second connection portions  423  of the second ground terminals G 2  and the second signal terminals S 2  are exposed in the second opening slot  412 . 
     Referring to  FIGS.  11  and  12   , the third terminal module  5  includes a third insulating block  51 , a plurality of third terminals  52  disposed in the third insulating block  51 , a third lossy member  53  mating with at least some of the third terminals  52 , and a third non-conductive layer  54  located between the third terminals  52  and the third lossy member  53 . In one embodiment of the present disclosure, the third terminals  52  are insert-molded with the third insulating block  51 . It can be understood that, in other embodiments, the third terminal  52  may also be fixed to the third insulating block  51  by assembling. The electrical connector  100  includes a third isolation portion which is a polymer material in some embodiments. The third isolation portion includes the third non-conductive layer  54 . 
     The third insulating block  51  includes a third protrusion  511  on each side thereof. The third protrusions  511  are used to be inserted into the third guide grooves  153  (see  FIG.  3   ) to assemble and position the third terminal module  5 . Referring to  FIG.  17   , the third insulating block  51  further includes a third opening slot  512  for receiving the third lossy member  53  and third locking slots  513  located at both ends of the third opening slot  512 . 
     From a structural point of view, each third terminal  52  is provided with a third elastic arm  521  extending toward the mating slot  10 , a third tail portion  522  for being mounted on the circuit board, and a third connection portion  523  connecting the third elastic arm  521  and the third tail portion  522 . The third elastic arm  521  is provided with a third contact portion  5211  protruding into the mating slot  10 . The third terminals  52  are supported by the insulating housing  1 . In the illustrated embodiment of the present disclosure, the third terminals  52  are supported by the insulating housing  1  via the third insulating block  51 . However, in other embodiments, the third terminals  52  can be supported by the insulating housing  1  directly through mounting features. 
     Referring to  FIGS.  11  and  12   , from a functional point of view, the third terminals  52  include at least two third ground terminals G 3  spaced apart from each other and a plurality of third signal terminals S 3  located between the two third ground terminals G 3 . The third ground terminals G 3  and the third signal terminals S 3  are disposed along the first direction (i.e., the left-right direction). In the illustrated embodiment of the present disclosure, the third connection portion  523  of the third ground terminals G 3  and the third signal terminals S 3  are exposed in the third opening slot  512 . 
     The fourth terminal module  6  includes a fourth insulating block  61 , a plurality of fourth terminals  62  disposed in the fourth insulating block  61 , a fourth lossy member  63  mating at least some of the fourth terminals  62 , and a fourth non-conductive layer  64  located between the fourth terminals  62  and the fourth lossy member  63 . In one embodiment of the present disclosure, the fourth terminals  62  are insert-molded with the fourth insulating block  61 . It can be understood that, in other embodiments, the fourth terminal  62  may also be fixed to the fourth insulating block  61  by assembling. The electrical connector  100  includes a fourth isolation portion which is a polymer material in some embodiments. The fourth isolation portion includes the fourth non-conductive layer  64 . 
     The fourth insulating block  61  includes a fourth protrusion  611  on each side thereof. The fourth protrusions  611  are used to be inserted into the fourth guide grooves  154  to assemble and position the fourth terminal module  6 . Referring to  FIG.  17   , the fourth insulating block  61  further includes a fourth opening slot  612  for receiving the fourth lossy member  63  and fourth locking slots  613  located at both ends of the fourth opening slot  612 . 
     From a structural point of view, each fourth terminal  62  is provided with a fourth elastic arm  621  extending toward the mating slot  10 , a fourth tail portion  622  for being mounted on the circuit board, and a fourth connection portion  623  connecting the fourth elastic arm  621  and the fourth tail portion  622 . The fourth elastic arm  621  is provided with a fourth contact portion  6211  protruding into the mating slot  10 . The fourth terminals  62  are supported by the insulating housing  1 . In the illustrated embodiment of the present disclosure, the fourth terminals  62  are supported by the insulating housing  1  via the fourth insulating block  61 . However, in other embodiments, the fourth terminals  62  can be supported by the insulating housing  1  directly through mounting features. 
     Referring to  FIGS.  13  and  14   , from a functional point of view, the fourth terminals  62  include at least two fourth ground terminals G 4  spaced apart from each other and a plurality of fourth signal terminals located between the two fourth ground terminals G 4 . The fourth ground terminals G 4  and the fourth signal terminals S 4  are disposed along the first direction (i.e., the left-right direction). In the illustrated embodiment of the present disclosure, the fourth connection portion  623  of the fourth ground terminals G 4  and the fourth signal terminals S 4  are exposed in the fourth opening slot  612 . 
     Referring to  FIG.  19   , the first contact portions  3211  and the fourth contact portions  6211  are arranged face to face along a direction N which is perpendicular to the mating direction M. The second contact portions  4211  and the third contacts portion  5211  are arranged face to face along the direction N perpendicular to the mating direction M. In addition, the first contact portions  3211  and the second contact portions  4211  are arranged one behind the other along the mating direction M. The fourth contact portions  6211  and the third contact portions  5211  are arranged one behind the other along the mating direction M. 
     Referring to  FIGS.  15  to  19   , the first lossy member  33  includes a first body portion  331  and a plurality of first hook portions  332  extending perpendicularly from two sides of the first body portion  331 . The first body portion  331  includes two first ribs  333  formed inside of the first body portion  331  and spaced apart from each other. The two first ribs  333  are in contact with the first non-conductive layer  34 , the first non-conductive layer  34  is in contact with the first ground terminals G 1 , and the first signal terminals Si are located between the two first ribs  333 . The first hook portions  332  are clamped and fixed in the first locking slots  313  along a second direction (i.e., a vertical direction) perpendicular to the first direction to fix the first lossy member  33 . 
     The second lossy member  43  includes a second body portion  431  and a plurality of second hook portions  432  extending perpendicularly from two sides of the second body portion  431 . The second body portion  431  includes two second ribs  433  formed inside of the second body portion  431  and spaced apart from each other. The two second ribs  433  are in contact with the second non-conductive layer  44 , the second non-conductive layer  44  is in contact with the second ground terminals G 2 , and the second signal terminals S 2  are located between the two second ribs  433 . The second hook portions  432  are clamped and fixed in the second locking slots  413  along the second direction (i.e., the vertical direction) perpendicular to the first direction to fix the second lossy member  43 . 
     The third lossy member  53  includes a third body portion  531  and a plurality of third hook portions  532  extending perpendicularly from two sides of the third body portion  531 . The third body portion  531  includes two third ribs  533  formed inside of the third body portion  531  and spaced apart from each other. The two third ribs  533  are in contact with the third non-conductive layer  54 , the third non-conductive layer  54  is in contact with the third ground terminals G 3 , and the third signal terminals S 3  are located between the two third ribs  533 . The third hook portions  532  are clamped and fixed in the third locking slots  513  along the second direction (i.e., the vertical direction) perpendicular to the first direction to fix the third lossy member  53 . 
     The fourth lossy member  63  includes a fourth body portion  631  and a plurality of fourth hook portions  632  extending perpendicularly from two sides of the fourth body portion  631 . The fourth body portion  631  includes two fourth ribs  633  formed inside of the fourth body portion  631  and spaced apart from each other. The two fourth ribs  633  are in contact with the fourth non-conductive layer  64 , the fourth non-conductive layer  64  is in contact with the fourth ground terminals G 4 , and the fourth signal terminals S 4  are located between the two fourth ribs  633 . The fourth hook portions  632  are clamped and fixed in the fourth locking slots  613  along the second direction (i.e., the vertical direction) perpendicular to the first direction to fix the fourth lossy member  63 . 
     Since the first terminal module  3 , the second terminal module  4 , the third terminal module  5  and the fourth terminal module  6  in the illustrated embodiment of the present disclosure are similar in structure, in the following, only the first terminal module  3  is taken as an example for detailed description. 
     Referring to  FIGS.  15  to  19   , in an embodiment of the present disclosure, the first non-conductive layer  34  is an insulating film. The first non-conductive layer  34  and the first lossy member  33  are two separated components. The first non-conductive layer  34  is sandwiched between the first ground terminals G 1  and the first lossy member  33 . In an embodiment of the present disclosure, the first non-conductive layer  34  is laid on the first ground terminals G 1  and the first signal terminals S 1 . With this arrangement, the first lossy member  33  and the first ground terminals G 1  may not be in direct contact, which improves the consistency of installation. Besides, by providing the first non-conductive layer  34  which insulates the first lossy member  33  from the first ground terminals G 1 , general electrical signals are not conducted, and the electrical performance of the electrical connector  100  is improved. In addition, a proper distance is maintained between the first lossy member  33  and the first ground terminals G 1  to achieve better grounding effect. At the same time, the first lossy member  33  is not in contact with the first signal terminals S 1  so as to avoid signal interference and solve crosstalk resonance. This arrangement improves the consistency of the installation of the first lossy member  33  and the first ground terminals G 1 , avoids the problem that the first lossy member  33  contacts some first ground terminals G 1  and does not contact some other first ground terminals G 1 , and improves the anti-interference ability of the electrical connector  100 . 
     Referring to  FIGS.  20  to  22   , in another embodiment of the present disclosure, the first non-conductive layer  34  and the first lossy member  33  are fixed together. The first non-conductive layer  34  is in contact with the first ground terminals G 1 , which can also achieve the object of the present disclosure. 
     The fixing method of the first non-conductive layer  34  and the first lossy member  33  can be implemented in different ways. For example, Referring to  FIG.  22   , in one embodiment, the first non-conductive layer  34  is an insulating coating which is coated on the first rib  333  of the first lossy member  33 . Under this condition, the first non-conductive layer  34  and the first lossy member  33  are compounded together to form a component. In other embodiments, the first non-conductive layer  34  may also be an insulating film which is fixed to the first rib  333  of the first lossy member  33  by pasting. 
     In an embodiment of the present disclosure, the material of the first non-conductive layer  34 , the second non-conductive layer  44 , the third non-conductive layer  54  and the fourth non-conductive layer  64  is Kapton. Kapton is a trade name of polyimide (PI) film material, and it has been already well known to those skilled in the art, so duplicated description is omitted here. 
     It should be noted that since the terminal module  2  in the specific embodiment of the present disclosure includes a first terminal module  3 , a second terminal module  4 , a third terminal module  5  and a fourth terminal module  6 , in order to facilitate each element to correspond to the reference numerals in the drawings of the specification, elements with names like “first”, “second”, “third” and “fourth” are used to distinguish them. However, it can be understood that the removal of “first”, “second”, “third” and “fourth” represents the superordinate concept of these elements. When understanding the protection scope of the patent claims, this logic should be referred to. 
     Referring to  FIGS.  23  to  33   , an electrical connector  100 ′ in a second embodiment is disclosed. The electrical connector  100 ′ includes an insulating housing  1 ′, a terminal module  2 ′ mounted to the insulating housing  1 ′ and a metal shell  7 ′ enclosing the insulating housing  1 ′. 
     Referring to  FIGS.  27  and  28   , the insulating housing  1 ′ includes a mating surface  10 ′ and a mounting surface  13 ′ for mounting the electrical connector  100 ′ on a circuit board. A mating slot  11 ′ is formed extending through the mating surface  10 ′ for receiving a mating connector. A mounting groove  131 ′ is formed extending through the mounting surface  13 ′ for receiving the terminal module  2 ′. 
     The terminal module  2 ′ includes a first terminal module  3 ′, a second terminal module  4 ′, and a lossy member  8 ′ held between the first terminal module  3 ′ and the second terminal module  4 ′. The first terminal module  3 ′ includes a first insulating block  31 ′ and a plurality of first terminals  32 ′ disposed in the first insulating block  31 ′. The first terminals  32 ′ include at least two first ground terminals G 1 ′ and a plurality of first signal terminals S 1 ′ located between the two first ground terminals G 1 ′. The first insulating block  31 ′ is provided with a first isolation portion  310 ′ which isolates the plurality of first terminals  32 ′ from the lossy member  8 ′. The first terminals  32 ′ are supported by the insulating housing  1 ′. 
     The second terminal module  4 ′ includes a second insulating block  41 ′ and a plurality of second terminals  42 ′ disposed in the second insulating block  41 ′. The second terminals  42 ′ include at least two second ground terminals G 2 ′ and a plurality of second signal terminals S 2 ′ located between the two second ground terminals G 2 ′. The second insulating block  41 ′ is provided with a second isolation portion  410 ′ which isolates the plurality of second terminals  42 ′ from the lossy member  8 ′. The second terminals  42 ′ are supported by the insulating housing  1 ′. 
     The lossy member  8 ′ is provided with a plurality of ribs  81 ′ on its upper and lower surfaces. Inner surfaces of the first insulating block  31 ′ and the second insulating block  41 ′ are respectively provided with a plurality of grooves  314 ′ to receive the ribs  81 ′. 
     It should be noted that in the illustrated embodiment of the present disclosure, the lossy member  8 ′ is isolated from the first terminals  32 ′ and the second terminals  42 ′ by a layer of plastic (for example, the first isolation portion  310 ′ and the second isolation portion  410 ′). The ribs  81 ′ of the lossy member  8 ′ do not directly contact the first terminals  32 ′ or the second terminals  42 ′ so as to protect the terminals. At the same time, the first isolation portion  310 ′ and the second isolation portion  410 ′ are used as intermediate media to couple the lossy member  8 ′ with the corresponding first terminals  32 ′ and the second terminals  42 ′. There is a first distance between the first ground terminals G 1 ′ at the first isolation portion  310 ′ and the adjacent rib  81 ′. The first distance is between 0.01 mm and 0.25 mm. There is a second distance between the second ground terminals G 2 ′ at the second isolation portion  410 ′ and the adjacent rib  81 ′. The second distance is between 0.01 mm and 0.25 mm. These first and second distances allow the first ground terminals G 1 ′ and the second ground terminals G 2 ′ to establish electrical conduction with the lossy member  8 ′. Positions of the grooves  314 ′ correspond to positions of the first ground terminals G 1 ′ of the first terminal  32 ′ and the second ground terminals G 2 ′ of the second terminals  42 ′. 
     In some embodiments, the lossy member includes an electrically lossy material, such as a conductive plastic. In some embodiments, the lossy member includes a magnetically lossy material. In some embodiments, the lossy member includes a non-conductive magnetically lossy material, for example, a thin, flexible, high-loss, magnetically loaded, and electrically non-conductive silicone rubber material. 
     The above embodiments are only used to illustrate the present disclosure and not to limit the technical solutions described in the present disclosure. The understanding of this specification should be based on those skilled in the art. Descriptions of directions, such as “front”, “rear”, “top” and “bottom”, although they have been described in detail in the above-mentioned embodiments of the present disclosure, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the application, and all technical solutions and improvements that do not depart from the spirit and scope of the application should be covered by the claims of the application.