Abstract:
An antenna assembly for a wireless communication equipment of the invention comprises a fastening base that is fixedly connected to one side of the wireless communication equipment. An arm, retractable and deployable, has a first end that is movably connected to the fastening base in a manner that the arm, retractable and deployable, is capable of retracting close to the side of the wireless communication equipment and deploying away from the side of the wireless communication equipment. An antenna stem is pivotally connected to a second end of the arm, retractable and deployable. The pivotal connection between the antenna stem and the arm is such that a directional orientation of the antenna stem relative to the axis of the arm is adjustable by rotation for obtaining optimal transmission and reception.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a retractable and deployable antenna assembly and, more particularly, to a retractable and deployable antenna assembly for use with a portable computing device in wireless communication. 
     2. Description of the Related Art 
     The wireless technology becomes increasingly more popular, being currently implemented in diversified types of products such as a wireless computer keyboard, a wireless computer mouse, a portable computer, etc. A wireless transmission is advantageous for the reason that it does not necessitate connection cables, which facilitates the portability of the wireless communication equipment and makes its use very convenient. However, when wireless transmission is implemented, an important consideration is the installation of the antenna. An inadequate design or installation of the antenna usually constitutes an obstacle to a proper transmission and reception of information data. Generally, a rod-type antenna having its axis upwardly oriented provides better transmission and reception characteristics than dish-type antenna. 
     Referring to  FIG. 1 , a portable computer  10  that implements wireless communication usually needs the installation of a rod-type antenna  12  that is connected to the MODEM or the PCMCIA (Personal Computer Memory Card International Association) card of the computer. Due to this necessary connection, the antenna therefore is usually mounted at a lateral side of the portable computer. When wireless communication is performed, the antenna  12  has to be erected upward to obtain optimal transmission and reception characteristics. As a result, while typing on the keyboard, the user&#39;s hands  14  may involuntarily touch the antenna  12 . Manual typing on the keyboard therefore is inconvenient and, furthermore, repeatedly touching the antenna  12  may cause loosening of its connection and even the damage of the antenna  12 . Additionally, the conventional assembly of the antenna  12  usually does not allow a convenient arrangement, and the antenna  12  often forms a protruded shape over the portable computer that usually has a planar and smooth contour. With the antenna mounted thereon, the portable computer therefore cannot be conveniently placed in a computer bag. As a result, the antenna is conventionally constructed as an external component that is mounted to the portable computer only when it is needed. If the portable computer has to be placed in a bag, the antenna has to be dismounted. 
     SUMMARY OF THE INVENTION 
     It is therefore a principal object of the invention to provide a retractable and deployable antenna assembly for use with a portable computing device in wireless communication that can solve the above problems of the prior art. 
     To attain the above and other objectives, an antenna assembly for use with a portable computing device in wireless communication of the invention comprises a fastening base that is connected to one side of the portable computing device. An arm, retractable and deployable, has a first end that is movably connected to the fastening base in a manner that the arm is capable of retracting close to the side of the portable computing device and deploying away from the side of the portable computing device. An antenna stem is pivotally connected to a second end of the arm. The pivotal connection between the antenna stem and the arm is such that a directional orientation of the antenna stem relative to the axis of the arm is adjustable by rotation for obtaining optimal transmission and reception. A metallic wire further runs respectively along the fastening base, the arm, and the antenna stem for conducting electromagnetic waves. 
     According to a first embodiment, the arm, retractable and deployable, is a telescopic arm formed by an assembly of a plurality of telescopic tubes. The antenna stem further is connected to the telescopic arm via a connecting rod that pivotally engages with the second end of the telescopic arm. 
     According to a second embodiment, the antenna stem is connected to the telescopic arm via a rotary connection that allows a rotation of the antenna stem in a plane containing the axis of the telescopic arm. 
     According to a third embodiment, a spring is further mounted within the telescopic arm. A mounting region of the fastening base with the telescopic arm is further provided with a guide groove to which corresponds a projection on the outer surface of the telescopic arm. Thereby, once the projection of the telescopic arm, being telescopically retracted, is within the guide groove, an axial rotation of the telescopic arm locks the telescopic arm in the retracted configuration. To deploy the antenna assembly, the telescopic arm is reversely rotated to have the projection located in the guide groove. The spring thereby can resiliently pushes out and deploys the telescopic arm and the antenna stem. 
     According to a fourth embodiment, a traversal stem that is pivotally connected to the fastening base. The traversal stem is pivotally connected to the antenna rod. Additionally, the rotation axis of the pivotal connection between the antenna rod and the traversal stem is inclined in respect of the rotation axis of the pivotal connection between the traversal stem and the fastening base. Thereby, the antenna rod is foldable over the axis of the traversal stem that, further, is foldable in a manner to be closely parallel to the lateral side of the portable computing device. 
     To provide a further understanding of the invention, the following detailed description illustrates embodiments and examples of the invention, this detailed description being provided only for illustration of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings included herein provide a further understanding of the invention. A brief introduction of the drawings is as follows: 
         FIG. 1  is a schematic view illustrating a conventional mount of an antenna on a portable computer; 
       FIG.  2 ( a ) is a schematic view particularly illustrating an antenna assembly for use with a portable computing device in wireless communication according to a first embodiment of the invention; 
       FIG.  2 ( b ) is an enlarged view of the zone A of FIG.  2 ( a ); 
       FIG.  2 ( c ) and FIG.  2 ( d ) are perspective views illustrating an implementation of the antenna assembly of the invention mounted on a portable computer according to the first embodiment of the invention; 
         FIG. 3  is a schematic view illustrating an antenna assembly for use with a portable computing device in wireless communication according to a second embodiment of the invention; 
       FIG.  4 ( a ) and FIG.  4 ( b ) are schematic views illustrating an antenna assembly for use with a portable computing device in wireless communication according to a third embodiment of the invention; and 
       FIG.  5 ( a ) and FIG.  5 ( b ) are schematic views illustrating an antenna assembly for use with a portable computing device in wireless communication according to a fourth embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Wherever possible in the following description, like reference numerals will refer to like elements and parts unless otherwise illustrated. 
     An aspect of the invention is to provide an antenna assembly having an antenna stem that can be directionally oriented to obtain optimal wireless transmission and reception. Furthermore, the antenna assembly of the invention can be conveniently retracted close to the portable computing device. 
     Referring to FIG.  2 ( a ), a schematic view illustrates an antenna assembly for wireless communication equipment according to a first embodiment of the invention. The antenna assembly  20  comprises an L-shaped antenna end portion  21 , a telescopic arm comprised of first and second telescopic tubes  22 ,  23 , a fastening base  24 , a metallic wire  25 , and a fastening screw  26 . In FIG.  2 ( a ), the dotted line illustrates the metallic wire  25  that runs respectively along the L-shaped antenna end portion  21 , the first and second tubes  22 ,  23 , and the fastening base  24  for transmitting and receiving electromagnetic waves. The fastening screw  26  is attached to an end of the metallic wire  25  for electrically connecting to a wireless network card such as a PCMCIA card. The antenna end portion  21  comprises an antenna stem  211  connected to a connecting rod  212  that telescopically and pivotally engages with the first tube  22 . The first tube  22  telescopically engages with the second tube  23  that, in turn, telescopically engages with the fastening base  24 . Via the above mount is thereby constructed a retractable arm. An outer radius of the first tube  22  is slightly smaller than an inner radius of the second tube  23  so that the first and second tubes  22 ,  23  can slide and rotate relative to each other. The metallic wire  25  of the prevent invention can be replaced by any conductive material other than metal. FIG.  2 ( b ) is an enlarged view of the zone A in FIG.  2 ( a ). As illustrated, an outer annular flange  222  outwardly protrudes from an outer surface of the first tube  22 , while an inner annular flange  232  inwardly protrudes from an inner surface of the second tube  23 . The abutment of the flanges  222 ,  232  against each other enables to limit the deployment of the first tube  22  relative to the second tube  23  and thereby prevents their separation. A rotation limiter is further formed on the first and second tubes  22 ,  23  to limit their relative rotation. As illustrated, the rotation limiter is constructed via, for example, the formation of corresponding abutment projections  224 ,  234  respectively on the first and second tubes  22 ,  23  that abut against each other when both tubes rotate a certain angle relative to each other. Similar dispositions may be also provided between the connecting rod  212  and the first tube  22  and between the second tube  23  and the fastening base  24 . Via the pivotal connection of the connecting rod  212  with the telescopic arm, the antenna stem  211  can be thereby directionally adjusted to orient upward for better transmission and reception. 
     Referring to FIG.  2 ( c ), the antenna assembly  20 , formed as described above, may be mounted on, for example, a wireless network card or a PCMCIA card  27  of a portable computer  28 . When no wireless transmission or reception is performed, the telescopic arm is compactly retracted, and the antenna end portion  21  is rotated to lie horizontally. The antenna assembly  20  thereby does not protrude over the keyboard surface and is arranged parallel close to a lateral side of the portable computer  28 . The portable computer  28  therefore can be conveniently placed in a computer bag, and typing on the keyboard is not hampered by the antenna assembly. 
     Referring to FIG.  2 ( d ), when wireless transmission or reception is to be performed, the antenna end portion  20  is rotated in a manner that its stem  211  is adequately oriented, and the telescopic arm is pulled out in length. The antenna end portion  20  is thereby spaced apart a sufficient distance from the lateral side of the portable computer  28  to allow a comfortable manipulation of the computer by the user. 
     Now referring to  FIG. 3 , a schematic view illustrates an antenna assembly for use with a portable computing device in wireless communication according to a second embodiment of the invention. In this second embodiment, the antenna assembly  30  includes an antenna stem  31 , a rotary connection  32 , a telescopic arm comprised of first, second, and third telescopic tubes  33 ,  34 ,  35  engaging with one another, a fastening base  36 , a metallic wire  37  and a fastening screw  38 . Similar to the previous embodiment, the telescopic arm formed by the tubes  33 ,  34 ,  35  can be retracted and deployed along a direction X, and the metallic wire  37  and fastening screw  38  are assembled for transmission and reception of electromagnetic waves to a wireless network card. Furthermore, the rotary connection  32  has a rotation axis Y around which the antenna stem  31  can rotate. This enables the antenna stem  31  to be adequately oriented for optimal transmission and reception. 
     Referring to FIG.  4 ( a ) and FIG.  4 ( b ), two schematic views illustrate an antenna assembly for use with a portable computing device in wireless communication according to a third embodiment of the invention. FIG.  4 ( a ) particularly illustrates the antenna assembly in a deployed configuration. As illustrated, the antenna assembly  40  of this embodiment comprises an antenna stem  41  that has one end pivotally connected through a rotary connection  42  to a telescopic tube  43 . The telescopic tube  43  engages through a fastening base  44 , and a metallic wire  45 , attached to a fastening screw  46  at a distal end, runs through the telescopic tube  43  and antenna stem  41 . A spring  47  is further mounted within the telescopic tube  43  and fastening base  44 . A first end of the spring  47  is connected to the rotary connection  42  while a second end of the spring  47  is connected to an end of the fastening base  44 . A projection  48  is formed on a surface of the front end of the telescopic tube  43 , corresponding to a guide groove  49  formed on the fastening base  44 . The size and shape of the guide groove  49  are adapted to allow the passage of the projection  48  of the telescopic tube  43 . 
     Referring to FIG.  4 ( b ), when no wireless transmission or reception is performed, the telescopic tube  43  is retracted until the projection  48  is located within the fastening base  44 , which compresses the spring  47 . The telescopic tube  43  and the antenna stem  41  then are rotated around the direction X (i.e. axis of the telescopic tube  43 ) until the antenna stem  41  lies horizontal. The orientation of the projection  48  relative to the guide groove  49  is thereby biased, which locks the antenna assembly  40  in the retracted configuration. When the antenna assembly  40  is to be deployed, the antenna stem  41  and telescopic tube  43  are reversely rotated until the projection corresponds to the guide groove  49 . The resilient force accumulated by the spring  47  thereby can be released to deploy the telescopic tube  43 , and the antenna assembly recovers its deployed configuration of FIG.  4 ( a ). 
     Referring to FIG.  5 ( a ) and FIG.  5 ( b ), two schematic views illustrate an antenna assembly for use with a portable computing device in wireless communication according to a fourth embodiment of the invention. As illustrated in FIG.  5 ( a ) showing a deployed configuration, the antenna assembly  50  of this embodiment comprises an antenna rod  51  that is pivotally connected through a first rotary connection  52  to a traversal arm  53 . The traversal arm  53  is pivotally connected through a second rotary connection  54  to a fastening base  55 . According to the construction of this embodiment, the rotation axis of the second rotary connection  54  is preferably inclined perpendicular to the rotation axis of the first rotary connection  52 . Similar to the previous embodiments, a metallic wire  56  and a fastening screw  57  are provided for transmission and reception of electromagnetic waves. When no wireless transmission or reception is performed, the antenna rod  51  is rotated around the rotation axis Y of the first rotary connection  52  to be folded on the traversal arm  53 . Furthermore, the traversal arm  53  can be rotated around the rotation axis Z of the second rotary connection  54  to be folded closely on the side of the portable computer. A convenient retracted arrangement where the antenna assembly is thereby obtained, as illustrated in FIG.  5 ( b ). 
     As described above, the invention therefore provides an antenna assembly that can be directionally oriented for optimal transmission and reception and, furthermore, can be conveniently retracted closely parallel to one side of portable computing device. 
     According to a first, second, and third embodiment, the antenna assembly can be retracted via an assembly of a telescopic arm, and directionally oriented via the pivotal mount of an antenna stem to the telescopic arm. 
     According a fourth embodiment, the antenna assembly can be retracted and directionally oriented for optimal transmission and reception via pivotal mounts of a traversal arm and an antenna stem. 
     Those skilled in the art will readily appreciate that the above description is only illustrative of specific embodiments and examples of the invention. The invention should therefore cover various modifications and variations made to the herein-described structures and operations, provided they fall within the scope of the invention as defined in the following appended claims.