Abstract:
Disclosed herein is a multi-combined multi-frequency antenna, and in particular, to an antenna which has a helically wound conductor and a plate type or a linear type conductor, so as to form a multi-combined antenna which is operatable against various frequency bands.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a multi-combined multi-frequency antenna, and in particular, to an antenna which has a helically wound conductor and a plate type or a linear type conductor, so as to form a multi-combined antenna which is operatable against various frequency bands. 
   2. Description of the Prior Art 
   As it is well known, an antenna plays an important role on the communication engineering. If it had not been for an antenna, transmission and reception of communication signals would have become impossible, and electronic technology would have lost its playground. 
   A well-known stub antenna emerged out of a cellular phone housing  100  is shown in FIG.  1 . An essential part, an antenna body  200  is, as shown in  FIG. 2 , made of a helically wound wire conductor, which is further sectioned into two or more than two sections L 1 , L 2 , . . . . The pitches P 1 , P 2  . . . of two successive L 1 , L 2  helically wound wire conductors make the antenna applicable for multi-frequency band communication. 
   A stub  300  is fitted into the hollow fuselage of the antenna body  200  therefore increasing the extra cost of the stub  300 , moreover, the cascade connection of the helically wound wire conductors L 1 , L 2  . . . results in increasing the height and the fabrication cost of the antenna. 
   In order to solve the above-described problems, the present inventor has carried out theoretical studies and simulating experiments, and based on these studies and researches, the present inventor has come to propose the present invention. 
   SUMMARY OF THE INVENTION 
   Accordingly, the main object of the present invention is to provide a multi-combined multi-frequency antenna whose main body is composed of two or more sections in which one of the two sections is enveloped by the other, and the inner one may also serve as a supporting stem of an antenna so as to shorten the length of antenna and reduce the fabrication cost of the antenna. 
   To achieve the aforesaid object, the antenna of the present invention comprises a helically wound antenna conductor and a plate type or a linear type antenna conductor, the former is formed with helically wound wires, while the latter is formed by printing an antenna conductor pattern on a plate substrate, or another helically wound wire conductor. The base part of the antenna conductor pattern is formed with several protuberances. The helically wound antenna conductor and the plate type antenna conductor are connected together by contacting their base parts with each other thereby forming a multi-frequency antenna consisting of two antenna sections. 
   When the antenna is formed with two sections of helically wound antenna conductors, the smaller one is enveloped by the larger one, its length then also can be greatly reduced. 
   Because the height of the antenna of present invention is greatly reduced, it then can greatly reduce the size of portable transmission apparatus and its manufacturing cost, this is also another object of present invention. 
   Furthermore, because the antenna body of the present invention can be constructed by two helical conductors to be enveloped together, and the two ends of helical antenna conductors are linearly extended. Consequently, it is easy to respectively change the length of the end of said helical antenna to make each of the helical antenna have a special relationship with a wave. Then achieve the function of multi-frequency. This is also another object of present invention. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A more complete understanding of these and other features and advantages of the patent invention will become apparent from a careful consideration of the following detailed description of certain embodiments illustrated in the accompanying drawings, in which: 
       FIG. 1  is a schematic view of a conventional cellular phone and its antenna. 
       FIG. 2  is a schematic view showing the antenna construction inside the housing of the cellular phone shown in  FIG. 1 ; 
       FIG. 3  is a schematic view of the multi-combined multi-frequency antenna according to the present invention; 
       FIG. 4  is a schematic view of the helical antenna conductor in combination with the connection seat of the present invention; 
       FIG. 5  is a schematic view of the antenna in an embodiment of the present invention; 
       FIG. 6  is a schematic view of the antenna conductor showing another embodiment of the present invention; 
       FIG. 7  is a schematic view showing one more embodiment of the antenna conductor of the present invention. 
       FIGS. 8A ,  8 B and  8 C are two schematic views showing three more embodiments of the antenna conductor of the present invention. 
       FIG. 9  is a schematic view showing the antenna of the present invention is accommodated in a housing of a cellular phone. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIGS. 1 and 2  are schematic views of a cellular phone with its affixed antenna whose structural characteristic has been illustrated and thus will not be repeated herein. 
     FIG. 3  shows a schematic view of the antenna of the present invention. It is clearly seen that a preferred embodiment of the antenna of the present invention essentially comprises a plurality of helical antenna conductors  21 ,  22  and connecting seat  23  for antenna conductors. 
   The pitch distances and lengths of the helical antenna conductors  21 ,  22  are respectively in a defined relationship with a specific frequency band. As shown in  FIG. 4 , a preferred embodiment of connecting seat  23  for antenna conductors  21 ,  22  has a transmitting rod  230 , on the transmitting rod  230 , there are a plurality of transmitting plates  231 ,  232  to be separated by isolating plates  241 ,  243 . The outer diameters of transmitting plates  231 ,  232  are respectively matched with the inner diameters of the bases of said helical antenna conductors  21 ,  22 . Such that the helical antenna conductors  21 ,  22  can respectively envelop said separated transmitting plates  231 ,  232  and to be fixed onto them. The ends of helical antenna conductors  21 ,  22  are extension portions  210 ,  220  of linearly extended. The lengths of said extension portions  210 ,  220  can be changed by cutting out a segment of the extension portion  210  and  220 . Then an antenna conductor  21 / 22  which has a defined relationship with a wavelength of specific frequency band is obtained. While the lengths of the antenna conductors are different, the antenna then can be operatable against various frequency bands. 
   After the body construction of the multi-combined multi-frequency antenna of present invention is obtained, as shown in  FIG. 5 , the antenna construction can be sealed by injecting gel or resin into a housing to form a product of antenna. The height of the antenna can be made smaller than 10 mm. Because it contains the portion of linear antenna conductor, its function of receiving signals can be maintained. And, because its height is greatly reduced, the dimensions of electronic commissioners still can be greatly reduced. 
   As shown in  FIG. 6 , the antenna conductor of present invention can be constructed by a helical antenna conductor portion  31  and a perpendicular continuous linear conductor portion  32  extends from the central part of said helical antenna conductor  31 . The bases  310 ,  320  of said helical antenna conductor portion  31  and perpendicular continuous linear conductor portion  32  are connected to signal output and input terminals of the electronic circuit of electronic transmitting apparatus. After experiment, such construction also shows the functions of said first embodiment of present invention. 
   Again as shown in  FIG. 7 , the antenna conductor of present invention can be constructed by a helical antenna conductor portion  41  and a horizontal continuous linear conductor portion  42  extends from the central part of said helical antenna conductor  41 . The bases  410 ,  420  of said helical antenna conductor portion  41  and perpendicular continuous linear conductor portion  42  are connected to signal output and input terminals of the electronic circuit of electronic transmitting apparatus. After experiment, such construction also shows the functions of said first embodiment of present invention. 
   Further, as shown in  FIGS. 8A ,  8 B, and  8 C, the antenna body of present invention also can be constructed by a plurality of antenna conductor units  51 ,  52 ,  53 . While each of the antenna conductor units  51 ,  52 ,  53  contains respectively a thin PCB  511 / 521 / 531  and helical antenna conductor portion  512 / 522 / 532 . And, one base portion of said helical antenna conductor portion  512 / 522 / 532  is connected to the end of antenna conductor of said thin PCB  511 / 51 / 531 . After experiment, such construction also shows the functions of said first embodiment of present invention. 
   Although the present invention has been described with a certain degree of particularity, the present disclosure has been made by way of example and changes in details of structure may be made without departing from the spirit thereof.