Abstract:
An antenna structure and a medium component for use in a planar inverted-F antenna are disclosed. The antenna structure comprises a radiation component, a ground component and a medium component. A space is between the radiation component and the ground component for generating resonance effects to transmit and to receive electromagnetic waves. The medium component is set into the space which is between the radiation component and the ground component for fastening the space, but also has insulation and waterproof functions. The efficacy for the antenna structure transmitting and receiving electromagnetic waves can be ensured.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates to an antenna structure and a medium for use in a planar inverted-F antenna, and more particularly to the medium component with a waterproof function applied to the antenna structure.  
       BACKGROUND OF THE INVENTION  
       [0002]     In regard to wireless communication function implemented by a portable electronic apparatus, the quality of an antenna may influence the communication quality of the portable electronic apparatus. Therefore, the design for the antenna is an important issue for the portable electronic apparatus. Generally speaking, the antenna includes a monopole antenna, a spiral antenna, a micro-strip antenna and a planar inverted-F antenna (PIFA). The planar inverted-F antenna can be hidden into the portable electronic apparatus. The impedance match is then reached without increasing inductances and capacitances, so that the planar inverted-F antenna is in widespread use. However, the components of an antenna may be influenced by an environment to change electrical characterization. The antenna may not receive and send electromagnetic waves smoothly to further influence the communication quality.  
         [0003]     The inventor of the present invention based on years of experience on related research and development invents an antenna structure and a medium component for use in a planar inverted-F antenna to overcome foregoing shortcomings.  
       SUMMARY OF THE INVENTION  
       [0004]     Accordingly, the object of the present invention is to provide an antenna structure and a medium component for use in a planar inverted-F antenna. The medium component with waterproof function is applied in the antenna structure. Therefore, the communication quality may not be influenced when components of the antenna is influenced by an environment to change electrical characterization.  
         [0005]     In accordance with the antenna structure of the present invention, the antenna structure includes a radiation component, a ground component, an electrically conductive element and a medium component. A space is between the radiation component and the ground component. The electrically conductive element is used to connect the radiation component and the ground component to form a short. The resonance effect is then generated to allow the antenna structure to receive and send electromagnetic waves. Moreover, the medium component is disposed in the space between the radiation component and the ground component. The medium component is not only used to fasten the space, but also has insulation and a waterproof function.  
         [0006]     Additionally, another object of the present invention is to provide the medium component for use in the planar inverted-F antenna. The planar inverted-F antenna includes a radiation component, a ground component and an electrically conductive element. The radiation component and the ground component parallel with each other. A space is between the radiation component and the ground component. The electrically conductive element is used to connect the radiation component and the ground component to form a short. The resonance effect is then generated to allow the planar inverted-F antenna to receive and send electromagnetic waves. Furthermore, the medium component is disposed in the space between the radiation component and the ground component. The medium component is not only used to fasten the space, but also has insulation and a waterproof function. Because the medium component has the waterproof function, the dielectric constant may not be changed after the medium component absorbs wet. Alternatively oxidization may not occur when the radiation component and the ground component contact with the medium component. The electromagnetic waves received and sent by the antenna can be assured. Other features and advantages of the present invention and variations thereof will become apparent from the following description, drawings, and claims. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]      FIG. 1  is a schematic diagram illustrating an antenna structure according to an embodiment of the invention;  
         [0008]      FIG. 2  is a schematic diagram illustrating an antenna structure assembled in a portable electronic apparatus according to a preferred embodiment of the present invention;  
         [0009]      FIG. 3  is a perspective drawing illustrating a medium component for use in a planar inverted-F antenna according to an embodiment of the present invention; and  
         [0010]      FIG. 4  is a side elevation illustrating a medium component for use in a planar inverted-F antenna according to an embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0011]     Referring to  FIG. 1 , a schematic diagram illustrates an antenna structure according to an embodiment of the present invention. The antenna structure  11  includes a radiation component  111 , a ground component  112 , an electrically conductive element  114  and a medium component  113 . The radiation component  111  has electrical conductivity. A feed in unit  12  for signal feeding in is connected by the ground component  112 . The electrically conductive element  114  is for connecting the radiation component  111  and the ground component  112  to form a short. An inductance is then generated between the feed in unit  12  and the electrically conductive element  114  for impedance matching the radiation component  111 . Moreover, a distance is between the radiation component  111  and the ground component  112  in order to generate a capacitance. The antenna structure  11  then receives and sends electromagnetic waves through the resonant effect between the induction and the capacitance. Moreover, the medium component  113  is disposed in a space which is between the radiation component  111  and the ground component  112 . The medium component  113  includes a first plane and a second plane. The first plane parallels the second plane. The first plane is connected to the radiation component  111 . The second plane is connected to the ground component  112 . A free-edge  1111  of the radiation component  111  being distant from the electrically conductive element  114  may cause drooping due to the weight of the free-edge  1111 . The resonance effect may be further influenced. Therefore, the medium component  113  does not only have insulation and the waterproof function, but also supports the free-edge  1111  to fasten the space between the radiation component  111  and the ground component.  
         [0012]     Furthermore, because the medium component  113  has the waterproof function, the drying can be kept so that the dielectric constant of the medium component  113  is not influenced by a humid environment. The medium component  113  contacts the radiation component  111  and the ground component  112  so that there is no oxidation occurred for the radiation component  111  and the ground component  112  due to the waterproof function. The efficiency of the antenna structure  11  could be assured at an optimal state.  
         [0013]     The radiation component  111  and the ground component  112  are sheet metals and parallel each other. The electrically conductive element  114  can be a sheet metal or an extension arm from the radiation component  111 . The feed in unit can be a coaxial wire. The medium component  113  is solidified silica gel.  
         [0014]     Referring to  FIG. 2 , a schematic diagram illustrates an antenna structure assembled in a portable electronic apparatus according to a preferred embodiment of the present invention. The antenna structure  21  includes a radiation sheet metal  211 , a ground sheet metal  212  and solidified silica gel  213 . The radiation sheet metal  211  parallels the ground sheet metal  212 . A fixed distance is kept based on working frequencies of the antenna structure  21 . The radiation sheet metal  211  is connected to a coaxial wire  22  which is for signal feeding through the ground sheet metal. 212 . The radiation sheet metal  211  extends an extension arm  214  near a signal feed in point. The extension arm  214  and the ground sheet metal  212  are formed a short. The coaxial wire  22  is electrically connected to the antenna structure  21  and the portable electronic apparatus  23 . The solidified silica gel  213  can be used at −40° C.(centigrade)˜200° C. without deterioration. Meanwhile, hydrophobic material coated on a surface provides the waterproof function and also has slight flexibility and shock absorption. Therefore, the solidified silica gel  213  is connected to the radiation sheet metal  211  and the ground sheet metal  212  simultaneously to fasten and to protect the antenna structure  21 . The efficiency for the antenna structure  21  receiving and sending electromagnetic waves can be assured.  
         [0015]     Referring to  FIG. 3  and  FIG. 4 , a perspective drawing and a side elevation illustrate a medium component for use in a planar inverted-F antenna according to embodiments of the present invention. The planar inverted-F antenna  31  included a radiation component  311 , an electrically conductive element  314  and a ground component  312 . The planar inverted-F antenna  31  is electrically connected to a feed in unit  32 . The radiation component  311  has electrical conductivity and is connected to the feed in unit  32  for signal feeding. The radiation component  311  is connected to the electrically conductive element  314  for forming a short with the ground component  312  which also has electrical conductivity. As shown in  FIG. 4 , a          -shape area is formed between the feed in unit  32  and the electrically conductive element  314  so as to generate an inductance for impedance matching the radiation component  311 . The radiation component  311  parallels the ground component  312 . Moreover, a distance is between the radiation component  311  and the ground component  312  to form a capacitance. The antenna structure  31  then receives and sends electromagnetic waves through the resonance effect between the inductance and the capacitance. The medium component  313  is disposed in a space which is between the radiation component  311  and the ground component  312 . The medium component  313  includes a first plane  3131  and a second plane  3132 . The first plane  3131  parallels the second plane  3132 . The first plane  3131  is connected to the radiation component  311 . The second plane  3132  is connected to the ground component  312 . A free-edge  3111  of the radiation component  311  being distant from the electrically conductive element  314  may cause drooping, which may result in a non-uniform distance between the radiation component  311  and the ground component  312 , and the radiation component  311  does not parallel the ground component  312 . The resonance effect is further influenced. Therefore, the medium component  313  does not only have insulation and the waterproof functions; but also supports the free-edge  3111  to fasten the space between the radiation component  311  and the ground component  312 .  
         [0016]     Furthermore, because of the medium component  313  has the waterproof function, the drying can be kept so that the dielectric constant of the medium component  313  is not influenced by a humid environment. The medium component  313  contacts the radiation component  311  the ground component  312  so that there is no oxidation occurred for the radiation component  311  and the ground component  312  due to the waterproof function. The efficiency of the antenna structure could be assured at an optimal state.  
         [0017]     Although the features and advantages of the embodiments according to the preferred invention are disclosed, it is not limited to the embodiments described above, but encompasses any and all modifications and changes within the spirit and scope of the following claims.