Patent Publication Number: US-8531338-B2

Title: Wireless communication device

Description:
BACKGROUND 
     1. Technical Field 
     The disclosure generally relates to wireless communication devices, particularly to a wireless communication device for reducing frequency shift. 
     2. Description of Related Art 
     Antennas are usually assembled in a portable wireless communication device to send and/or receive signals. However, the antennas are susceptible to interference from electromagnetic waves generated by other electronic members such as a speaker, or a camera. Therefore, a frequency shift may occur when a flip-type wireless communication device converts from a closed state to an open state, or vice versa, because of different intensity interferences. Communication qualities of the portable wireless communication device will be affected as a result. 
     Therefore, there is room for improvement within the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the wireless communication device can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the wireless communication device. 
         FIG. 1  is a schematic view of a wireless communication device in an opened state, according to an exemplary embodiment. 
         FIG. 2  is a disassembled schematic view of the wireless communication device of  FIG. 1 . 
         FIG. 3  is a disassembled schematic view of an antenna module and an elastic member of the wireless communication device of  FIG. 1 . 
         FIG. 4  is similar to  FIG. 3 , but shown from another aspect. 
         FIG. 5  is a schematic view of the antenna module and the elastic member of the wireless communication device of  FIG. 1 , when the elastic member is in an original state. 
         FIG. 6  is a schematic view of the wireless communication device of  FIG. 1  in a closed state. 
         FIG. 7  is a schematic view of the antenna module and the elastic member of the wireless communication device of  FIG. 5 , and the elastic member is deformed. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1 , a wireless communication device  100 , such as a mobile phone or a personal digital assistant (PDA), includes a main body  10 , a cover  15 , an attracting member  20 , a base board  30 , an antenna module  40  and an elastic member  50 . 
     Referring to  FIG. 2 , the main body  10  is a housing of the wireless communication device  100  and defines a receiving notch  12  at one corner thereof. The cover  15  is rotatably attached to the main body  10 . The attracting member  20  may be a magnet. The attracting member  20  is received in the receiving notch  12 . The base board  30  is a flexible printed circuit board (FPCB) including a feeding point  32  and a grounding point  34   
     Referring to  FIG. 3  and  FIG. 4 , the antenna module  40  includes a first antenna  42  and a second antenna  44 . The first antenna  42  includes a first radiating body  420  and a first grounding end  422 . The first radiating body  420  includes a first main portion  424 , a first connecting portion  426 , and a first extending portion  428 . The first main portion  424  is substantially a rectangular sheet. One end of the first connecting portion  426  perpendicularly connects to the first main portion  424  at one edge thereof. Another end of the first connecting portion  426  perpendicularly connects the first extending portion  428 . The first extending portion  428  is a strip-shaped sheet. The first extending portion  428  and the first main portion  424  are substantially parallel and symmetrically positioned at opposite sides of the first connecting portion  426 . The first grounding end  422  extends from an edge of the main portion  424  opposite to the first connecting portion  426 , and connects to the grounding point  34  of the base board  30 . 
     The second antenna  44  includes a second radiating body  440  and a second grounding end  442 . The second radiating body  440  includes a second main portion  444 , a second connecting portion  446 , and an extending portion  448 . The second main portion  444  is similar to the first main portion  424 . In this exemplary embodiment, the second main portion  444  has substantially the same dimensions as the first main portion  424 . The second connecting portion  446  is substantially an L-shaped sheet. Two ends of the second connecting portion  446  respectively connect to the second main portion  444  and the second extending portion  448 . The second extending portion  448  is a strip-shaped sheet which is substantially parallel to and facing toward the second main portion  444 . The length of the second extending portion  448  is smaller than that of the first extending portion  428 . The second grounding end  442  is substantially an L-shaped sheet connecting to one side of the second main portion  444  opposite to the second extending portion  448 . 
     The elastic member  50  is substantially a zigzag metal sheet including a fixing portion  52 , a first contact portion  54 , a bent portion  56  and a second contact portion  58  connected in series. The fixing portion  52  is secured on the base board  30  and connects to the feeding point  32 . The first contact portion  54 , the bent portion  56  and the second contact portion  58  extend away from one edge of the base board  30 . Referring to  FIG. 5 , in an original state, the first contact portion  54  contacts the first main portion  424  of the first antenna  42 ; the second contact portion  58  is positioned between the first antenna  42  and the second antenna  44  and separate from both of them. 
     Referring to  FIGS. 6 and 7 , to assemble the wireless communication device  100 , the attracting member  20  is received in the receiving notch  12 . The first grounding end  422  of the first antenna  42  and the second grounding end  442  of the second antenna  44  connect to the grounding point  34  of the base board  30  and are symmetrically positioned at opposite sides of the base board  30 . The fixing portion  52  of the elastic member  50  is secured to the feeding point  32  of the base board  30 . The base board  30 , the antenna module  40  and the elastic member  50  are mounted in the cover  15 . Finally, the cover  15  is attached to the main body  10 . 
     When in an open state, the elastic member  50  is in the original state, the first contact portion  54  of the elastic member  50  contacts the first main portion  424  of the first antenna  42 . The antenna module  40  forms a first current path from the fixing portion  52  to the first grounding end  422  by the first radiating body  420  which is suitable for the open state. Referring to  FIG. 7 , when in a closed state, the attracting member  40  attracts the elastic member  50  toward the second antenna  44 . The elastic member  50  deforms until the second contact portion  58  contacts the second main portion  444  of the second antenna  44 . The first current path is broken and the antenna module  40  forms a second current path from the fixing portion  52  to the second grounding end  442  by the second radiating body  440 . Because the length of the second extending portion  448  of the second radiating body  440  is smaller than that of the first extending portion  428 , the second current path is shorter than the first current path and more suitable for the closed state. To unfold the wireless communication device  100 , the attracting member  40  is moved away from the cover  15 , and the elastic member  50  returns back to its original state. The first contact portion  54  of the elastic member  50  contacts the first main portion  424  of the first antenna  42 . 
     The wireless communication device  100  selectively causes the first antenna  42  or the second antenna  44  suitable for the open or closed state adjusted by the elastic member  50  and obtains a stable and desired frequency to avoid a frequency shift. 
     In other embodiments, the fixing portion  52  of the elastic member  50  can be secured at the grounding point  34  of the base board  30 . The first grounding end  422  of the first antenna  42  and the second grounding end  442  of the second antenna  44  can be selectively chosen to contact to the grounding point  34  of the base board  30  for different states. 
     It is believed that the exemplary embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the disclosure.