Abstract:
An antenna module mainly includes at least one antenna capable of radiating signals of two frequencies, a grounding portion, and at least one isolation metal sheet capable of isolating signals of a frequency generated by different antennas from each other to avoid interference. The antenna module is integrally formed, which can reduce the volume of the antenna module, and provide a stable radiation pattern and broadband and multi-band functions.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This non-provisional application claims priority under 35 U.S.C. §119(a) on patent application No(s). 100219607 filed in Taiwan, R.O.C. on Oct. 19, 2011, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND 
     1. Technical Field 
     The disclosure relates to an antenna module, and more particularly to a broadband and multi-band antenna module having a stable radiation pattern. 
     2. Related Art 
     To connect to wireless local area network, a computer device must be electrically connected to a radio transceiver device. An electrical connection portion of the radio transceiver device generally meets the standard specification of a Universal Serial Bus (USB), and can be electrically connected to a USB port of the computer device. Therefore, at least one antenna module for receiving and transmitting radio signals needs to be built in the radio transceiver device, and preferably, the antenna module is a broadband and multi-band antenna module. However, as communication apparatuses become lighter, thinner, shorter, and smaller, the size of the antenna module also needs to be gradually reduced, resulting in the incapability of optimizing the performance of the antenna module. In order to solve the above problem, in the prior art, multiple antennas must be arranged in a communication apparatus with limited volume, which is difficult to design. Alternatively, the antenna module is manufactured outside the communication apparatus, which largely increases the volume of the radio transceiver device and does not meet the light and thin requirements of the modern communication apparatus. 
     On the contrary, to install the antenna module in a miniature communication apparatus and maintain the antenna performance as well, the volume of the antenna module must be limited to a certain size, and thus the operation band of the antenna module is limited, or a radiation pattern of poor stability is caused. Therefore, to design a broadband and multi-band antenna module having an omnidirectional and stable radiation pattern is one of the schemes for developing an antenna module built in a miniature communication apparatus. 
     SUMMARY 
     In view of the above, the disclosure is an antenna module that can be built in an electronic device, and more particularly a broadband and multi-band antenna module having a stable radiation pattern. 
     An antenna module according to an embodiment of the disclosure comprises a first antenna, a second antenna, a grounding portion, and an isolation metal sheet. The grounding portion comprises a first sub-connection portion and a second sub-connection portion. The first sub-connection portion is connected to one end of the grounding portion, the second sub-connection portion is connected to the other end of the grounding portion, the first sub-connection portion is connected to the first antenna, and the second sub-connection portion is connected to the second antenna. The first antenna and the second antenna each comprise a first radiation portion and a second radiation portion. The first radiation portion and the second radiation portion each are of a serpentine structure and used for receiving and transmitting a radio frequency signal. Each of the first radiation portions of the first antenna and the second antenna further comprises a first fixing portion. Each first fixing portion is formed by extending the first radiation portion. Each of the second radiation portions of the first antenna and the second antenna further comprises a second fixing portion. Each second fixing portion is formed by extending the second radiation portion. The first fixing portion or the second fixing portion may be used for feeding a signal. The isolation metal sheet comprises a connection portion and an isolation portion. One end of the connection portion is connected to the isolation portion, and the other end of the connection portion is formed by perpendicularly extending the grounding portion. The isolation metal sheet is used for isolating signals from the second radiation portions of the first antenna and the second antenna from each other to avoid interference. 
     An antenna module according to an embodiment of the disclosure comprises a first antenna, a second antenna, a third antenna, a grounding portion, a first isolation metal sheet, and a second isolation metal sheet. The grounding portion comprises a first sub-connection portion, a second sub-connection portion, and a third sub-connection portion. The first sub-connection portion of the grounding portion is connected to the first antenna, the second sub-connection portion is connected to the second antenna, and the third sub-connection portion is connected to the third antenna. The first antenna, the second antenna, and the third antenna each comprise a first radiation portion and a second radiation portion. The first radiation portion and the second radiation portion each are of a serpentine structure and used for receiving and transmitting a radio frequency signal. Each of the first radiation portions of the first antenna, the second antenna, and the third antenna further comprises a first fixing portion. Each first fixing portion is formed by extending the first radiation portion. Each of the second radiation portions of the first antenna, the second antenna, and the third antenna further comprises a second fixing portion. Each second fixing portion is formed by extending the second radiation portion. The first isolation metal sheet and the second isolation metal sheet are formed by extending the grounding portion. The first isolation metal sheet is connected between the first sub-connection portion and the second sub-connection portion and between the second sub-connection portion and the third sub-connection portion of the grounding portion at the same time. The second isolation metal sheet is connected between the first sub-connection portion and the third sub-connection portion and between the second sub-connection portion and the third sub-connection portion at the same time. 
     An antenna module according to an embodiment of the disclosure comprises a first antenna, a second antenna, a third antenna, a grounding portion, a first isolation metal sheet, a second isolation metal sheet, and a third isolation metal sheet. The grounding portion comprises a first sub-connection portion, a second sub-connection portion, and a third sub-connection portion. The first sub-connection portion is connected to the first antenna, the second sub-connection portion is connected to the second antenna, and the third sub-connection portion is connected to the third antenna. The first antenna, the second antenna, and the third antenna each comprise a first radiation portion and a second radiation portion. The first radiation portion and the second radiation portion each are of a serpentine structure and used for receiving and transmitting a radio frequency signal. Each of the first radiation portions of the first antenna, the second antenna, and the third antenna further comprises a first fixing portion. Each first fixing portion is formed by extending the first radiation portion. Each of the second radiation portions of the first antenna, the second antenna, and the third antenna further comprises a second fixing portion. Each second fixing portion is formed by extending the second radiation portion. The first isolation metal sheet, the second isolation metal sheet, and the third isolation metal sheet are formed by extending the grounding portion. The first isolation metal sheet is connected between the second sub-connection portion and the third sub-connection portion of the grounding portion. The second isolation metal sheet is connected between the first sub-connection portion and the second sub-connection portion. The third isolation metal sheet is connected between the first sub-connection portion and the third sub-connection portion. 
     According to the structure of the antenna module in the disclosure, two radiation portions are provided and antennas are arranged in all directions to transmit signals, so that the volume of the antenna module and the electronic device can be greatly reduced, and the stable radiation pattern and broadband and multi-band requirements can be met. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the disclosure, and wherein: 
         FIG. 1  shows an antenna module according to a first embodiment of the disclosure; 
         FIG. 2  shows an antenna module according to a second embodiment of the disclosure; and 
         FIG. 3  shows an antenna module according to a third embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The detailed features and advantages of the disclosure are described below in great detail through the following embodiments, and the content of the detailed description is sufficient for persons skilled in the art to understand the technical content of the disclosure and to implement the disclosure accordingly. Based upon the content of the specification, the claims, and the drawings, persons skilled in the art can easily understand the relevant objectives and advantages of the disclosure. The following embodiments are intended to describe the disclosure in further detail, but not intended to limit the scope of the disclosure in any way. 
       FIG. 1  is a schematic structural view of an antenna module according to a first embodiment of the disclosure. The structure shown in this figure is formed of a piece of conductive material, for example, metal. For the convenience of description, the antenna module is disassembled into a plurality of components. 
     The antenna module according to the first embodiment of the disclosure comprises a first antenna  10 , a second antenna  40 , a grounding portion  70 , and an isolation metal sheet  80 . The first antenna  10  comprises a first radiation portion  20  and a second radiation portion  30 . An overall structure of the second antenna  40  is the same as that of the first antenna  10 , so the reference numbers of structures in the second antenna  40  are omitted and replaced with those of the first antenna  10 . Therefore, the first embodiment of the disclosure is described mainly by taking an example that the first antenna  10  is disassembled into a plurality of components. The grounding portion  70  of the antenna in the first embodiment of the disclosure comprises a first sub-connection portion  72  and a second sub-connection portion  74 . The first sub-connection portion  72  is located at one end of the grounding portion  70 , and the second sub-connection portion  74  is located at the other end of the grounding portion  70 . The first sub-connection portion  72  is connected to the first antenna  10 , and the second sub-connection portion  74  is connected to the second antenna  40 . The isolation metal sheet  80  comprises a connection portion  81  and an isolation portion  82 . One end of the connection portion  81  is connected to the isolation portion  82 , and the other end of the connection portion  81  is connected to the grounding portion  70 . The connection portion  81  of the isolation metal sheet  80  is formed by perpendicularly extending the grounding portion  70 . The isolation metal sheet  80  is used for isolating signals generated by the first antenna  10  and the second antenna  40  from each another, to avoid interference. 
     The first antenna  10  comprises the first radiation portion  20 , the second radiation portion  30 , a first fixing portion  90 , and a second fixing portion  91 . The first radiation portion  20  is of a serpentine structure formed by a U-shaped section and a plurality of L-shaped sections, comprising a first L-shaped section  22 , a second L-shaped section  26 , and a U-shaped section  24 . The first radiation portion  20  of the first antenna  10  further has a first radiation connection section  23  connected between the first L-shaped section  22  and the U-shaped section  24  and a second radiation connection section  25  connected between the U-shaped section  24  and the second L-shaped section  26 . The second L-shaped section  26  of the first antenna  10  is connected to the first sub-connection portion  72  of the grounding portion  70 , and a second L-shaped section  56  of the second antenna  40  is connected to the second sub-connection portion  74  of the grounding portion  70 . The shape and size of the first L-shaped section  22  may be the same as or different from those of the second L-shaped section  26 . Each of the second radiation portions  30  of the first antenna  10  and the second antenna  40  comprises a first L-shaped section  32  and a second L-shaped section  34 . The second L-shaped section  34  is connected between the first L-shaped section  32  and the U-shaped section  24  of the first radiation portion  20 . The shape and size of the first L-shaped section  32  may be the same as or different from those of the second L-shaped section  34 . The first fixing portion  90  and the second fixing portion  91  may each be of an L-shaped structure. The first fixing portion  90  may be formed by perpendicularly extending the first L-shaped section  22  of the first radiation portion  20  of the first antenna  10 , and the second fixing portion  91  may be formed by perpendicularly extending an end of the first L-shaped section  32  in the second radiation portion  30  of the first antenna  10 . The first fixing portion  90  and the second fixing portion  91  help to fix the antenna in an electronic device, and the first fixing portion  90  or the second fixing portion  91  may be selected as a signal feeding point. The numbers and shapes of the U-shaped sections, the radiation connection sections and the L-shaped sections in the first antenna  10  and the second antenna  40  of this embodiment are not intended to limit the scope of the disclosure and can be designed according to an actual application. 
       FIG. 2  is a schematic structural view of an antenna module according to a second embodiment of the disclosure. The structure shown in this figure is integrally formed of a conductive material, for example, metal. For the convenience of description, the antenna module is disassembled into a plurality of components for description. 
     The antenna module according to the second embodiment of the disclosure comprises a first antenna  600 , a second antenna  700 , a third antenna  800 , a grounding portion  900 , a first isolation metal sheet  980 , and a second isolation metal sheet  990 . The first antenna  600  comprises a first radiation portion  620  and a second radiation portion  650 , and the second antenna  700  comprises a first radiation portion  720  and a second radiation portion  750 . In this embodiment, an overall structure of the third antenna  800  is similar to that of the second antenna  700 , so that most of reference numbers of the third antenna  800  are omitted. Therefore, this embodiment of the disclosure is described mainly by taking an example that the first antenna  600  and the second antenna  700  are disassembled into a plurality of components. The grounding portion  900  comprises a first sub-connection portion  910 , a second sub-connection portion  920 , and a third sub-connection portion  930 . The first sub-connection portion  910  is connected to the first antenna  600 , the second sub-connection portion  920  is connected to the second antenna  700 , and the third sub-connection portion  930  is connected to the third antenna  800 . The first isolation metal sheet  980  and the second isolation metal sheet  990  of this embodiment are used for isolating signals generated by the first antenna  600 , the second antenna  700 , and the third antenna  800  from each other, to avoid interference. 
     The first antenna  600  comprises the first radiation portion  620 , the second radiation portion  650 , a first fixing portion  670 , and a second fixing portion  680 . The first radiation portion  620  comprises a U-shaped section  622 , an L-shaped section  624 , and a radiation connection section  623 . The radiation connection section  623  is connected between the U-shaped section  622  and the L-shaped section  624 . The L-shaped section  624  is connected to the first sub-connection portion  910  of the grounding portion  900 . The sub-sections of the U-shaped section  622  may have the same width, or the width of a certain sub-section is greater than the width of another sub-section. The second radiation portion  650  comprises a first L-shaped section  652  and a second L-shaped section  654 . The second L-shaped section  654  is connected between the first L-shaped section  652  and the U-shaped section  622  of the first radiation portion  620 . The shape and size of the first L-shaped section  652  may be the same as or different from those of the second L-shaped section  654 . The first fixing portion  670  and the second fixing portion  680  may each be of an L-shaped structure. The first fixing portion  670  may be formed by perpendicularly extending the U-shaped section  622  of the first radiation portion  620  of the first antenna  600 , and the second fixing portion  680  may be formed by perpendicularly extending an end of the first L-shaped section  652  in the second radiation portion  650  of the first antenna  600 . 
     The second antenna  700  and the third antenna  800  each comprise the first radiation portion  720 , the second radiation portion  750 , a first fixing portion  770 , and a second fixing portion  780 . The first radiation portion  720  is of a serpentine structure formed by a plurality of U-shaped sections and an L-shaped section, comprising a first U-shaped section  722 , a second U-shaped section  724 , and an L-shaped section  726 . The second antenna  700  further comprises a first radiation connection section  723  connected between the first U-shaped section  722  and the second U-shaped section  724  and a second radiation connection section  725  connected between the second U-shaped section  724  and the L-shaped section  726 . The third antenna  800  also has a similar structure. The L-shaped section  726  of the second antenna  700  is connected to the second sub-connection portion  920  of the grounding portion  900 , and the L-shaped section  826  of the third antenna  800  is connected to the third sub-connection portion  930  of the grounding portion  900 . The shape and size of the first U-shaped section  722  may be the same as or different from those of the second U-shaped section  724 . The shapes of the second U-shaped section  724  and the L-shaped section  726  of the first radiation portion  720  of the second antenna  700  may be the same as or different from the shapes of the second U-shaped section  824  and the L-shaped section  826  of the first radiation portion  820  of the third antenna  800 . The second radiation portion  750  further comprises a first L-shaped section  752  and a second L-shaped section  754 . The second L-shaped section  754  is connected between the first L-shaped section  752  and the second U-shaped section  724  of the first radiation portion  720 . The first fixing portion  770  and the second fixing portion  780  may each be of an L-shaped structure. The first fixing section  770  may be formed by perpendicularly extending the second U-shaped section  724  of the first radiation portion  720  of the second antenna  700 , and the second fixing portion  780  may be formed by perpendicularly extending an end of the first L-shaped section  752  in the second radiation portion  750  of the second antenna  700 . The first fixing portion and the second fixing portion in each of the first antenna  600 , the second antenna  700 , and the third antenna  800  of this embodiment help to fix the antenna in an electronic device, and the first fixing portion or the second fixing portion may be selected as a signal feeding point. The numbers and shapes of the U-shaped sections, the radiation connection sections and the L-shaped sections of this embodiment are not intended to limit the scope of the disclosure and can be designed according to an actual application. 
     In the second embodiment of the disclosure, the antenna module further comprises the first isolation metal sheet  980  and the second isolation metal sheet  990 . Each isolation metal sheet further comprises a connection portion  992  and an isolation portion  994 . One end of the connection portion  992  is connected to the isolation portion  994 , and the other end of the connection portion  992  is formed by perpendicularly extending the grounding portion  900 . The first isolation metal sheet  980  is located between the first sub-connection portion  910  and the second sub-connection portion  920  and between the second sub-connection portion  920  and the third sub-connection portion  930  of the grounding portion  900  at the same time, and the second isolation metal sheet  990  is located between the first sub-connection portion  910  and the third sub-connection portion  930  and between the second sub-connection portion  920  and the third sub-connection portion  930  of the grounding portion  900  at the same time. In other embodiments, the numbers, shapes and connection positions of the isolation metal sheets may be designed according to an actual application. 
       FIG. 3  is a schematic structural view of an antenna module according to a third embodiment of the disclosure. The structure shown in this figure is integrally formed of a conductive material, for example, metal. For the convenience of description, an antenna is disassembled into a plurality of components for description. 
     The antenna module according to the third embodiment of the disclosure comprises a first antenna  100 , a second antenna  200 , a third antenna  300 , a grounding portion  400 , a first isolation metal sheet  520 , a second isolation metal sheet  540 , and a third isolation metal sheet  560 . The first antenna  100  comprises a first radiation portion  120  and a second radiation portion  150 , and the second antenna  200  comprises a first radiation portion  220  and a second radiation portion  250 . An overall structure of the third antenna  300  is the same as that of the second antenna  200 , so that most of reference numbers of the third antenna  300  are omitted. Therefore, this embodiment of the disclosure is described mainly by taking an example that the first antenna  100  and the second antenna  200  are disassembled into a plurality of components. The grounding portion  400  of the antenna of this embodiment comprises a first sub-connection portion  410 , a second sub-connection portion  420 , and a third sub-connection portion  430 . The first sub-connection portion  410  is connected to the first antenna  100 , the second sub-connection portion  420  is connected to the second antenna  200 , and the third sub-connection portion  430  is connected to the third antenna  300 . The first isolation metal sheet  520 , the second isolation metal sheet  540 , and the third isolation metal sheet  560  are used for isolating signals generated by the first antenna  100 , the second antenna  200 , and the third antenna  300  from each other, to avoid interference. 
     The first antenna  100  comprises the first radiation portion  120 , the second radiation portion  150 , a first fixing portion  170 , and a second fixing portion  180 . The first radiation portion  120  is of a serpentine structure formed by a plurality of U-shaped sections, comprising a first U-shaped section  122 , a second U-shaped section  124 , and a third U-shaped section  126 . The first radiation portion  120  of the first antenna  100  further comprises a first radiation connection section  123  connected between the first U-shaped section  122  and the second U-shaped section  124 , a second radiation connection section  125  connected between the second U-shaped section  124  and the third U-shaped section  126 , and a third radiation connection section  127  connected between the third U-shaped section  126  and the first sub-connection portion  410  of the grounding portion  400 . The shapes and sizes of the first U-shaped section  122 , the second U-shaped section  124 , and the third U-shaped section  126  may be the same as or different from each other. The second radiation portion  150  of the first antenna  100  comprises a first L-shaped section  152  and a second L-shaped section  154 . The second L-shaped section  154  is connected between the first L-shaped section  152  and the second radiation connection section  125  of the first radiation portion  120 . The shape and size of the first L-shaped section  152  may be the same as or different from those of the second L-shaped section  154 . The first fixing portion  170  and the second fixing portion  180  may each be of an L-shaped structure. The first fixing section  170  may be formed by perpendicularly extending the second U-shaped section  124  of the first radiation portion  120  of the first antenna  100 , and the second fixing portion  180  is formed by perpendicularly extending an end of the first L-shaped section  152  in the second radiation portion  150  of the first antenna  100 . 
     The second antenna  200  and the third antenna  300  each comprise the first radiation portion  220 , the second radiation portion  250 , a first fixing portion  270 , and a second fixing portion  280 . The first radiation portion  220  is of a serpentine structure formed by a plurality of U-shaped sections and an L-shaped section, comprising a first U-shaped section  222 , a second U-shaped section  224 , and an L-shaped section  226 . The first radiation portion  220  of the second antenna  200  further comprises a first radiation connection section  223  connected between the first U-shaped section  222  and the second U-shaped section  224 , and a second radiation connection section  225  connected between the second U-shaped section  224  and the L-shaped section  226 . The third antenna  300  also has a similar structure. The L-shaped section  226  of the second antenna  200  is connected to the second sub-connection portion  420  of the grounding portion  400 , and the L-shaped section  326  of the third antenna  300  is connected to the third sub-connection portion  430  of the grounding portion  400 . The shape and size of the first U-shaped section  222  may be the same as or different from those of the second U-shaped section  224 . The shape of the L-shaped section  226  of the first radiation portion  220  of the second antenna  200  may be the same as or different from the shape of the L-shaped section  326  of the first radiation portion  320  of the third antenna  300 . The second radiation portion  250  further comprises an L-shaped section  252  and a radiation connection section  254 . The radiation connection section  254  is connected between the L-shaped section  252  and the second U-shaped section  224  of the first radiation portion  220 . The first fixing portion  270  and the second fixing portion  280  may each be of an L-shaped structure. The first fixing section  270  may be formed by perpendicularly extending the second U-shaped section  224  of the first radiation portion  220  of the second antenna  200 , and the second fixing portion  280  may be formed by perpendicularly extending an end of the L-shaped section  252  in the second radiation portion  250  of the second antenna  200 . The first fixing portion and the second fixing portion in each of the first antenna  100 , the second antenna  200 , and the third antenna  300  of this embodiment help to fix the antenna in an electronic device, and the first fixing portion or the second fixing portion may be selected as a signal feeding point. In addition, the disclosure is not limited to the first fixing portion and the second fixing portion in each of the first antenna  100 , the second antenna  200 , and the third antenna  300  of this embodiment, which means these fixing portions are optional. It is understood by people skilled in the art that any configuration which is able to fix the antenna in the electronic device falls within the scope of the embodiments of the disclosure. The numbers and shapes of the U-shaped sections, the radiation connection sections and the L-shaped sections of the first antenna  100 , the second antenna  200 , and the third antenna  300  of this embodiment are not intended to limit the scope of the disclosure and can be designed according to an actual application. In such a case, the numbers and shapes of the first radiation portion and the second radiation portion in each of the first antenna  100 , the second antenna  200 , and the third antenna  300  of this embodiment are not intended to limit the scope of the disclosure and can be designed according to an actual application. Thus, the radiation connection sections connected between U-shaped sections, the radiation connection sections and the L-shaped sections are not intended to limit the scope of the disclosure. 
     In the third embodiment of the disclosure, the antenna module further comprises the first isolation metal sheet  520 , the second isolation metal sheet  540 , and the third isolation metal sheet  560 . Each isolation metal sheet further comprises a connection portion  522  and an isolation portion  524 . One end of the connection portion  522  is connected to the isolation portion  524 , and the other end of the connection portion  522  is formed by perpendicularly extending the grounding portion  400 . The first isolation metal sheet  520  is located between the second sub-connection portion  420  and the third sub-connection portion  430  of the grounding portion  400 , the second isolation metal sheet  540  is located between the first sub-connection portion  410  and the second sub-connection portion  420  of the grounding portion  400 , and the third isolation metal sheet  560  is located between the first sub-connection portion  410  and the third sub-connection portion  430  of the grounding portion  400 . The structures of the first isolation metal sheet  520 , the second isolation metal sheet  540 , and the third isolation metal sheet  560  are not limited to the configuration of the connection portion  522  and the isolation portion  524 . It is understood by people skilled in the art that the isolation metal sheet which is formed by extending the grounding portion  400  falls within the scope of the embodiments of the disclosure. 
     To sum up, the structure of the antenna module in the disclosure is an integrated structure that can be formed by directly bending a single metal plate, and provided with antennas arranged in all directions and different radiation portions. Therefore, the volume of the antennas can be greatly reduced to be adapted in an electronic device, and a stable radiation pattern and good radio signal receiving/transmitting capabilities can be achieved.