Patent Publication Number: US-11641054-B2

Title: Communication device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan application serial No. 108124163, filed on Jul. 9, 2019. The entirety of the above-mentioned patent applications are hereby incorporated by references herein and made a part of specification. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a communication device and, more particularly, to a communication device with an antenna. 
     Description of the Related Art 
     Conventionally, if an antenna of an electronic device is affected by metal (such as a back cover, a frame or a casing), the radiation efficiency is low, and the radiation pattern is poor. Antenna signals may be disconnected. As a result, a clear zone needs to be configured for the radiating of the antenna. For example, a slot of a certain size, length, and location needs to be configured at a metal casing. However, it affects the appearance of the whole electronic device. 
     BRIEF SUMMARY OF THE INVENTION 
     A communication device includes a metal back cover, a first radiator, and a second radiator. The metal back cover includes a slot. The first radiator and a slot overlap at a first direction. A portion of the second radiator and a portion of the second radiator overlap at the first direction. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a side view of a communication device according to an embodiment of the disclosure; 
         FIG.  2    is a schematic diagram showing a portion of a communication device according to an embodiment of the disclosure; 
         FIG.  3 A  is a cross section showing a portion of a communication device according to an embodiment of the disclosure; and 
         FIG.  3 B  is a cross section showing a portion of a communication device according to an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     These and other features, aspects and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings. In figures, the same number denotes the same or similar components or steps. 
       FIG.  1    is a side view of a communication device according to an embodiment of the disclosure. A communication device  100  includes a metal cover  110 A and a display  110 B. In an embodiment, the communication device  100  is a notebook computer, a smart phone, or a tablet computer, which is not limited herein. In  FIG.  1   , the communication device  100  is a notebook computer, a metal cover  110 A is a metal casing, and a display  110 B is a display panel, which is not limited herein. 
       FIG.  2    is a schematic diagram showing a portion of a communication device according to an embodiment of the disclosure. The communication device  100  includes a first radiator  150 A and a second radiator  150 B. The metal cover  110 A includes a slot  130 . The display  110 B includes a metal member  112 B. In an embodiment, the metal member  112 B overlaps the metal back cover  110 A at the direction Z. In the embodiment shown in  FIG.  2   , the slot  130  is ladder-shaped. In an embodiment, the slot  130  shape is irregular or other shapes with different directions, which is not limited herein. The slot  130  does not fully shield the first radiator  150 A at the first direction (such as the direction Z). In an embodiment, the slot  130  extends along another direction (such as the direction Y). 
     As shown in  FIG.  2   , the slot  130  overlaps the first radiator  150 A at the Direction Z. The first radiator  150 A does not overlap the metal back cover  110 A at the Direction Z. That is, the first radiator  150 A is exposed from the slot  130 . Part of the second radiator  150 B overlaps the metal back cover  110 A at the Direction Z. 
     The second radiator  150 B partly overlaps the first radiator  150 A at the Direction Z. A portion of the second radiator  150 B overlaps the slot  130  at the Direction Z. The other portion of the second radiator  150 B overlaps the metal back cover  110 A at the Direction Z. 
     As shown in  FIG.  1    and  FIG.  2   , the display  110 B overlaps the metal back cover  110 A at the Direction Z. The display  110 B overlaps a portion of the first radiator  150 A at the Direction Z. The metal member  112 B of the display  110 B overlaps part of the second radiator  150 B at the Direction Z. 
     The first radiator  150 A includes a first sub-section  152  and a second sub-section  154 . The second sub-section  154  does not overlap the metal back cover  110 A at the Direction Z. The second sub-section  154  overlaps the slot  130  at the Direction Z. The first sub-section  152  overlaps the metal back cover  110 A at the Direction Z. The metal member  112 B overlaps a portion of the second radiator  150 B at the Direction Z. In an embodiment, the first sub-section  152  and the second sub-section  154  of the first radiator  150 A overlaps the metal member  112 B at the Direction Z. 
     The second radiator  150 B includes a first sub-portion  157 , a second sub-portion  158 , and a third sub-portion  159 . The second sub-portion  158  is between the first sub-portion  157  and the third sub-portion  15 . In an embodiment, the first sub-portion  157  overlaps the slot  130  at the Direction Z. The second sub-portion  158  and the third sub-portion  159  overlaps the metal back cover  110 A at the Direction Z. In an embodiment, the first sub-portion  157  and the second sub-portion  158  overlaps the display  110 B at the Direction Z. The third sub-portion  159  does not overlap the display  110 B at the Direction Z. 
     In an embodiment, the first sub-portion  157  and the second sub-portion  158  overlaps the metal member  112 B at the Direction Z. The third sub-portion  159  does not overlap the metal member  112 B at the Direction Z. In addition, a portion of the first sub-portion  157  overlaps a portion of the second radiator  150 B at the Direction Z. In an embodiment, a portion of the second sub-section  154  overlaps a portion of the first sub-portion  157  at the Direction Z. 
     In an embodiment, the metal back cover  110 A with the slot  130 , the first radiator  150 A, the second radiator  150 B, and the display  110 B are stacked in sequence at the Direction Z. 
     In an embodiment, as shown in  FIG.  2   , the first sub-section  152  of the first radiator  150 A includes a ground end  191 . The ground end  191 of the first sub-section  152  is connected with the metal back cover  110 A. Then, the first radiator  150 A and the second radiator  150 B are connected to ground. 
     The second sub-section  154  is connected with the first sub-section  152 . The second sub-section  154  and the first sub-section  152  extend along the direction Y. An end of the second sub-section  154  of the first radiator  150 A far away from the first sub-section  152  includes a feeding end  192 . The first sub-portion  157  of the second radiator  150 B is connected with the second sub-section  154 . The second sub-portion  158  is connected with the first sub-portion  157 . The third sub-portion  159  and the second sub-portion  158  are connected and extend along the direction X. 
       FIG.  3 A  is a cross section showing a portion of a communication device according to an embodiment of the disclosure. In  FIG.  3 A , the cross section  3 - 3 A is an example of the cross section  3 - 3  in  FIG.  2   . In  FIG.  3 A , the first radiator  150 A and the second radiator  150 B are connected via an isolator  170 . In the embodiment, the first radiator  150 A and the slot  130  are configured at different planes XY, respectively. The planes XY are perpendicular to the Direction Z. 
       FIG.  3 B  is a cross section showing a portion of a communication device according to an embodiment of the disclosure. In  FIG.  3 B , the cross section  3 - 3 B is another example of the cross section  3 - 3  in  FIG.  2   . In the embodiment, the first radiator  150 A and the slot  130  are configured at different planes XY, respectively. The first radiator  150 A is configured in the slot  130 , and then the thickness of the communication device  100  is further reduced. 
     As shown in  FIG.  2   , the metal back cover  110 A is regarded as a portion of the radiator via a coupling way. In detail, the feeding end  192  of the first radiator  150 A feeds energy to the first radiator  150 A, the ground end  191  of the first radiator  150 A is connected with the metal back cover  110 A to connect the first radiator  150 A with the metal back cover  110 A to form a loop coupling antenna. By adjusting the length of the first radiator  150 A, the width of the first radiator  150 A, or the gap width S 1  between the first radiator  150 A and the metal back cover  110 A, the operation frequency of the first radiator  150 A is adjusted. 
     In the embodiment, the second radiator  150 B is a coupling strip and does not directly connected with the metal back cover  110 A. In an embodiment, the amount of coupling is adjusted by adjusting the overlapping area, the overlapping length, and the overlapping width between the first radiator  150 A and the second radiator  150 B at the Direction Z. Then, the antenna impedance matching and the frequency of the second radiator  150 B is adjusted. In an embodiment, the amount of coupling between the first radiator  150 A and the second radiator  150 B is determined by the overlapping area between the first radiator  150 A and the first sub-portion  157  of the second radiator  150 B. The operation frequency is adjusted by adjusting the amount of coupling. By adjusting the position of the first sub-portion  157  relating to the slot  130  and the first radiator  150 A at the direction Y, good resonance modes (impedance matching) can be effectively excited. 
     In an embodiment, the distance between the metal back cover  110 A and the display  110 B at the direction Y is the distance S 2 .The efficiency of the first radiator  150 A and the second radiator  150 B is adjusted by adjusting the distance S 2 . Conventionally, the efficiency of an antenna is affected when the first radiator  150 A and the second radiator  150 B are shielded by the display  110 B. However, in the embodiment, even if the first radiator  150 A is fully shielded by the display  110 B, the efficiency of an antenna is not affected. 
     In the embodiment, as shown in  FIG.  2   , even if portion of the first radiator  150 A and the second radiator  150 B are shielded by the metal back cover  110 A and the display  110 B, the first radiator  150 A and the second radiator  150 B also have good sending-receiving efficiency. In an embodiment, the first radiator  150 A operates at the frequency band of 2.4 GHz. In an embodiment, the first radiator  150 A is coupled with the second radiator  150 B to excite the slot  130  to operate at the frequency band of 5 GHz, which is not limited herein. 
     Different from conventional antennas, according to communication devices in embodiments, even if the size and the shape of the slot is various, the antenna radiation efficiency is high. In embodiments, the main extending branch of the radiator of the antenna and the metal casing are connected (that is, the antenna is connected with the metal casing) to reduce the influence of the metal cover. The antenna frequency and the impedance matching can be adjusted via the branch of the double path (such as the second sub-portion  158  of the second radiator  150 B in an embodiment). Then, even the length and the space of the main path of the antenna are limited, the required frequency band can be adjusted. Furthermore, the shape and the position of the slot can be various, and thus the slot can be adapted to kinds of electronic devices, and the efficiency of the radiator would not be affected. 
     Terms in specification and claim denote some specific components. However, people skilled in the art also know that the same components also may be named via different terms. As a result, the components should not be differentiated according to the terms, but according to the function. The terms “include”, “have” are open-ended. The term “couple” includes direct and indirect connections. For example, if a first component is couple with a second component, that means, the first component is directly and indirectly connected with the second component via electronic connection, wireless transmission, optical transmission, some other components and so on. 
     The shape, the size, and the relative positions of components in the figures are not used to limit the invention. 
     Although the present invention has been described in considerable detail with reference to certain preferred embodiments thereof, the disclosure is not for limiting the scope. Persons having ordinary skill in the art may make various modifications and changes without departing from the scope. Therefore, the scope of the appended claims should not be limited to the description of the preferred embodiments described above.