Patent Publication Number: US-11398667-B2

Title: Electronic device

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATION 
     This application claims priority to the U.S. Provisional Patent Application Ser. No. 62/877,850, filed on Jul. 24, 2019, which application is incorporated herein by reference in its entirety. 
     This application claims the benefit of priority to Taiwan Patent Application No. 109115506, filed on May 11, 2020. The entire content of the above identified application is incorporated herein by reference. 
     Some references, which may include patents, patent applications and various publications, may be cited and discussed in the description of this disclosure. The citation and/or discussion of such references is provided merely to clarify the description of the present disclosure and is not an admission that any such reference is “prior art” to the disclosure described herein. All references cited and discussed in this specification are incorporated herein by reference in their entireties and to the same extent as if each reference was individually incorporated by reference. 
    
    
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to an electronic device, and more particularly to an electronic device capable of transmitting and receiving radio frequency signals. 
     BACKGROUND OF THE DISCLOSURE 
     For the sake of aesthetics and robustness, an exterior casing of an electronic device is mostly made of a metal material. However, due to the characteristics of a metal casing, antenna modules within the electronic device are easily negatively affected, thereby decreasing a communication quality of a mobile device. 
     Therefore, how the communication quality of the electronic device can be improved and the aforementioned deficiencies can be overcome through reworking of the structural design, has become an important issue to be solved in this technical field. 
     SUMMARY OF THE DISCLOSURE 
     In response to the above-referenced technical inadequacies, the present disclosure provides an electronic device. 
     In one aspect, the present disclosure provides an electronic device including a first radiation element, a second radiation element, a grounding element and a feeding element. The first radiation element includes a first radiation portion and a feeding portion electrically connected to the first radiation portion. The second radiation element is coupled to the first radiation element and is separate from the first radiation element. The grounding element is electrically connected to the second radiation element. The feeding element includes a feeding end and a grounding end, the feeding end is electrically connected to the feeding portion, and the grounding end is electrically connected to the grounding element. An operating frequency band generated by the first radiation element is greater than an operating frequency band generated by the second radiation element. 
     Therefore, by virtue of “the second radiation element is coupled to the first radiation element and is separate from the first radiation element”, the first radiation element and the second radiation element of the electronic device of the present disclosure respectively generates two different operating frequency bands, and the operating frequency band generated by the first radiation element is greater than the operating frequency band generated by the second radiation element. 
     These and other aspects of the present disclosure will become apparent from the following description of the embodiment taken in conjunction with the following drawings and their captions, although variations and modifications therein may be affected without departing from the spirit and scope of the novel concepts of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure will become more fully understood from the following detailed description and accompanying drawings. 
         FIG. 1  is a schematic perspective view of an electronic device according to a first embodiment of the present disclosure. 
         FIG. 2  is an exploded view of the electronic device according to the first embodiment of the present disclosure. 
         FIG. 3  is an exploded perspective view of a portion of the electronic device according to the first embodiment of the present disclosure. 
         FIG. 4  is an exploded perspective view of another portion of the electronic device according to the first embodiment of the present disclosure. 
         FIG. 5  is a sectional view of a portion of the electronic device according to the first embodiment of the present disclosure. 
         FIG. 6  is a schematic view showing a first radiation element, a second radiation element, and a grounding element in a state of use, with a first casing and a second casing of the electronic device being stacked together, according to the first embodiment of the present disclosure. 
         FIG. 7  is an exploded perspective view of another implementation of the electronic device according to the first embodiment of the present disclosure. 
         FIG. 8  is an exploded view of an electronic device according to a second embodiment of the present disclosure. 
         FIG. 9  is an exploded perspective view of a portion of the electronic device according to the second embodiment of the present disclosure. 
         FIG. 10  is an exploded perspective view of another portion of the electronic device according to the second embodiment of the present disclosure. 
         FIG. 11  is a sectional view of another portion of the electronic device according to the second embodiment of the present disclosure. 
         FIG. 12  is a schematic view showing a first radiation element, a second radiation element, and a grounding element in a state of use, with a first casing and a second casing of the electronic device being stacked together, according to the second embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     The present disclosure is more particularly described in the following examples that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. Like numbers in the drawings indicate like components throughout the views. As used in the description herein and throughout the claims that follow, unless the context clearly dictates otherwise, the meaning of “a”, “an”, and “the” includes plural reference, and the meaning of “in” includes “in” and “on”. Titles or subtitles can be used herein for the convenience of a reader, which shall have no influence on the scope of the present disclosure. 
     The terms used herein generally have their ordinary meanings in the art. In the case of conflict, the present document, including any definitions given herein, will prevail. The same thing can be expressed in more than one way. Alternative language and synonyms can be used for any term(s) discussed herein, and no special significance is to be placed upon whether a term is elaborated or discussed herein. A recital of one or more synonyms does not exclude the use of other synonyms. The use of examples anywhere in this specification including examples of any terms is illustrative only, and in no way limits the scope and meaning of the present disclosure or of any exemplified term. Likewise, the present disclosure is not limited to various embodiments given herein. Numbering terms such as “first”, “second” or “third” can be used to describe various components, signals or the like, which are for distinguishing one component/signal from another one only, and are not intended to, nor should be construed to impose any substantive limitations on the components, signals or the like. Moreover, it should be particularly noted that “connect” in the entire present disclosure may refer to a direct connection or an indirect connection between two components, but the present disclosure is not limited thereto. In addition, it should be particularly noted that “couple” in the entire present disclosure may refer to a non-physical connection between two components, and electric field energy generated by a current of a component excites electric field energy of another component. 
     First Embodiment 
     Firstly, referring to  FIG. 1  and  FIG. 2 , a first embodiment of the present disclosure provides an electronic device U capable of receiving and transmitting radio frequency (RF) signals. For example, the electronic device U may be a smart phone, a tablet computer, or a notebook computer, but the present disclosure is not limited thereto. In addition, the electronic device U generates a first operating frequency band and a second operating frequency band, and the first operating frequency band is greater than the second operating frequency band. Specifically, a center frequency of the first operating frequency band is greater than a center frequency of the second operating frequency band. For example, the electronic device U generates an operating frequency band of between 1710 MHz and 2690 MHz (the first operating frequency band) and an operating frequency band of between 698 MHz and 960 MHz (the second operating frequency band), but the present disclosure is not limited thereto. 
     In the present disclosure, as an example, the electronic device U is a notebook computer. The electronic device U includes a first radiation element  1 , a second radiation element  2 , a grounding element  3  and a feeding element  4 , and the first radiation element  1 , the second radiation element  2 , the grounding element  3  and the feeding element  4  forms an antenna module A disposed in the electronic device U and is used to receive and transmit RF signals. The electronic device U further includes a first substrate S 1 , a second substrate S 2 , a first casing H 1  and a second casing H 2 . The first casing H 1  may be a palm rest of a notebook computer, and the second casing H 2  may be a bottom cover of a notebook computer, in other words,  FIG. 2  is a top view of the first casing H 1  when being flipped open to the left. It is worth noting that, in other implementations where the electronic device U is a smart phone or a tablet computer, the first casing H 1  and the second casing H 2  may respectively be two corresponding exterior casings of the smart phone or the tablet computer. 
     Referring to  FIG. 1  and  FIG. 2 , and in conjunction with  FIG. 3  and  FIG. 4 , in the first embodiment, the first radiation element  1  is disposed adjacent to the first casing H 1 , and the second radiation element  2  is disposed adjacent to the second casing H 2 , in other words, the first radiation element  1  is disposed closer to the first casing H 1  than the second radiation element  2  is, and the second radiation element  2  is disposed closer to the second casing H 2  than the first radiation element  1  is. In addition, for example, the first substrate S 1  is disposed on the first casing H 1 , the second substrate S 2  is disposed on the second casing H 2 , the first radiation element  1  is disposed on the first substrate S 1 , and the second radiation element  2  is disposed on the second substrate S 2 . It should be noted that, although in the first embodiment of the present disclosure, structures of the first radiation element  1  and the second radiation element  2  are exemplified as being respectively disposed on the first substrate S 1  and the second substrate S 2 , such that the first radiation element  1  and the second radiation element  2  are respectively adjacent to the first casing H 1  and the second casing H 2 , in other embodiments, the first radiation element  1  and the second radiation element  2  may be respectively disposed on two opposite surfaces of a same substrate S (as shown in  FIG. 7 ). The present disclosure is not limited to the manner of disposing the first radiation element  1  and the second radiation element  2  between the first casing H 1  and the second casing H 2 . It should be noted that, in one of the implementations, the first radiation element  1  mainly generates an operating frequency band of between 1710 MHz and 2690 MHz, and the second radiation element  2  mainly generates an operating frequency band of between 698 MHz and 960 MHz, but the present disclosure is not limited thereto. 
     For example, the material of the first casing H 1  may be metal, the material of the second casing H 2  may also be metal, and when the material of the first casing H 1  is metal, the grounding element  3  may be electrically connected to the first casing H 1 . It should be particularly noted that, the second casing H 2  has at least a non-metal area H 20  corresponding to the contours of the second radiation element  2 . Further, the orthogonal projection of the second radiation element  2  on the second casing H 2  at least partially overlaps with the non-metal area H 20  such that the second casing H 2  made of metal is prevented from negatively affecting the radiation efficiency of the second radiation element  2 . Preferably, in one of the implementations, an area of the orthogonal projection of the second radiation element  2  on the second casing H 2  is less than an area of the non-metal area H 20 , and the orthogonal projection of the second radiation element  2  on the second casing H 2  completely overlaps on the non-metal area H 20 . In addition, referring to  FIG. 3 , the non-metal area H 20  may be a groove on the second casing H 2 , whereas in other implementations the non-metal area H 20  may be formed by filling a non-metal element (as shown in  FIG. 7 ), such as plastic, in the groove on the second casing H 2 , but the present disclosure is not limited in a manner that the non-metal area H 20  is formed on the second casing H 2 . 
     It should be noted that, in the present disclosure, the material of the first casing H 1  and the second casing H 2  is exemplified as being metal, the orthogonal projection of the first radiation element  1  on the first casing H 1  and a metal area (not labeled in the figures) on the first casing H 1  at least partially or completely overlap with each other, the orthogonal projection of the second radiation element  2  on the first casing H 1  and a metal area (not labeled in the figures) on the first casing H 1  at least partially or completely overlap with each other, and the orthogonal projection of the second radiation element  2  on the second casing H 2  at least partially overlaps with the non-metal area H 20  on the second casing H 2 . In other implementations, the material of the second casing H 2  may be non-metal. In other words, the present disclosure may be applied to an electronic device U; wherein the material of at least one of the first casing H 1  and the second casing H 2  is metal, the first radiation element  1  that generates a greater operating frequency band is closer to the first casing H 1  made of metal material than the second radiation element  2  that generates a lesser operating frequency band, and the second radiation element  2  that generates a lesser operating frequency band is closer to the second casing H 2  made of metal or non-metal material than the first radiation element  1  that generates a greater operating frequency band, such that the overall radiation efficiency is improved. It should be noted that, regardless of whether the material of the second casing H 2  is metal or non-metal, the second casing H 2  has at least the non-metal area H 20  corresponding to the contours of the second radiation element  2 . 
     Referring to  FIG. 1  and  FIG. 2 , in conjunction with  FIG. 5 , when the first casing H 1  and the second casing H 2  are stacked together as shown in  FIG. 1 , the first casing H 1  and the second casing H 2  may have a distance there-between, and the first substrate S 1 , the second substrate S 2 , the first radiation element  1  and the second radiation element  2  are disposed between the first casing H 1  and the second casing H 2 , and are positioned at a corner between the first casing H 1  and the second casing H 2 . In other words, the first casing H 1  and the second casing H 2  have an accommodating space there-between (not labeled in the figures), and the first substrate S 1 , the second substrate S 2 , the first radiation element  1  and the second radiation element  2  are disposed in the accommodating space. Referring to  FIG. 5 , in the first embodiment, the first radiation element  1  and the first casing H 1  may have a first predetermined distance G 1  greater than 0.1 mm there-between, and the second radiation element  2  and the first casing H 1  may have a second predetermined distance G 2  greater than 5 mm there-between. Since the material of at least one of the first casing H 1  and the second casing H 2  is metal, a structure of the first radiation element  1  and the first casing H 1  having a first predetermined distance G 1  and the second radiation element  2  and the first casing H 1  having a second predetermined distance G 2  may be used to prevent the first casing H 1  and/or second casing H 2  from negatively affecting the radiation efficiency of the first radiation element  1  and the second radiation element  2 . 
     Reference is made to  FIG. 1  to  FIG. 4 , in conjunction with  FIG. 6 . It should be noted that, in order to clearly illustrate a use state of the first radiation element  1 , the second radiation element  2  and the grounding element  3  when the first casing H 1  and the second casing H 2  of the electronic device U of the first embodiment are stacked together, only the first radiation element  1 , the second radiation element  2  and the grounding element  3  are illustrated in  FIG. 6 . Specifically, in the first embodiment, the electronic device U includes the first radiation element  1 , the second radiation element  2 , the grounding element  3  and the feeding element  4 ; wherein the feeding element  4  is electrically connected between the first radiation element  1  and the grounding element  3 , the grounding element  3  is electrically connected to the second radiation element  2 , and the first radiation element  1  and the second radiation element  2  are respectively disposed on the first substrate S 1  and the second substrate S 2 . In addition, referring to  FIG. 1  and  FIG. 6 , the orthogonal projection of the second radiation element  2  on the first casing H 1  at least partially overlaps with the orthogonal projection of the first radiation element  1  on the first casing H 1 , and the second radiation element  2  is coupled to the first radiation element  1  and is separate from the first radiation element  1 , such that the first radiation element  1  couples to and excites the second radiation element  2 . In addition, the first radiation element  1  has a first radiation portion  11  and a feeding portion  10  being electrically connected to the first radiation portion  11 , and the feeding element  4  includes a feeding end  41  and a grounding end  42 . The feeding end  41  is electrically connected to the feeding portion  10  of the first radiation element  1  and the grounding end  42  is electrically connected to the grounding element  3 . 
     In this embodiment, the first radiation element  1 , the second radiation element  2  and the grounding element  3  may be a metal sheet, a metal wire or other electrical conductors that are conductive, the feeding element  4  may be a coaxial cable, and the first substrate S 1  and the second substrate S 2  may be a flame retardant substrate, a printed circuit board, or a flexible printed circuit board, but the present disclosure is not limited thereto. In addition, it is worth noting that the first radiation element  1 , the second radiation element  2  and the grounding element  3  may be formed on the first substrate S 1  and the second substrate S 2  by laser direct structuring (LDS) technology. 
     Referring to  FIG. 2  to  FIG. 5 , in the first embodiment, the electronic device U may further include a grounding conductive element C, the grounding conductive element C is disposed on the grounding element  3 , and the grounding conductive element C is electrically connected between the second radiation element  2  and the grounding element  3 , such that the grounding element  3  is electrically connected to the second radiation element  2  through the grounding conductive element C. In addition, the grounding conductive element C may abut against an abutting spot  200  of the second radiation element  2 , such that the grounding element  3  is electrically connected to the second radiation element  2 . Specifically, the grounding conductive element C is a conductive elastic metal element, such as a spring or a resilient member, but the present disclosure is not limited thereto. It is worth noting that, in other implementations, the grounding conductive element C may be disposed on the second radiation element  2 , and the grounding conductive element C abuts against the grounding element  3  and is electrically connected between the second radiation element  2  and the grounding element  3 . Further, the grounding conductive element C may be a protrusion (not shown in the figures) disposed on the second radiation element  2 , and the protrusion disposed on the second radiation element  2  may be abutted to the grounding element  3  such that the second radiation element  2  is electrically connected to the grounding element  3 . In addition, in another implementation, the grounding conductive element C may be a protrusion (not shown in the figures) disposed on the grounding element  3 , and the protrusion disposed on the grounding element  3  may be abutted to the second radiation element  2 . The present disclosure is not limited to the specific structure of the grounding conductive element C. 
     Referring to  FIG. 2  to  FIG. 6 , the specific structure of the first radiation element  1  and the second radiation element  2  is described as follows, and the following description is an example of the use state of the first radiation element  1 , the second radiation element  2  and the grounding element  3  when the first casing H 1  and the second casing H 2  of the electronic device U of the first embodiment are stacked together. Specifically, in the first embodiment, the first radiation element  1  further has a second radiation portion  12  electrically connected to the first radiation portion  11 , and the feeding portion  10  is electrically connected between the first radiation portion  11  and the second radiation portion  12 . Referring to  FIG. 6 , the first radiation portion  11  has a first section  111  connected to the feeding portion  10 , a second section  112  connected to the first section  111  and bent relative to the first section  111 , a third section  113  connected to the second section  112  and bent relative to the second section  112 , and a fourth section  114  connected to the third section  113  and bent relative to the third section  113 . In addition, the second radiation portion  12  has a fifth section  121  connected to the feeding portion  10 , a sixth section  122  connected to the fifth section  121  and bent relative to the fifth section  121 . In addition, the second radiation element  2  has a seventh section  21  electrically connected to the grounding element  3  and an eighth section  22  connected to the seventh section  21  and bent relative to the seventh section  21 , and the abutting spot  200  of the second radiation element  2  is positioned on the seventh section  21 . It should be noted that, the present disclosure is not limited to a specific shape of the first radiation element  1  and the second radiation element  2 . 
     Referring to  FIG. 6 , the first section  111  may be extended in a first direction (positive Y-direction) relative to the feeding portion  10 , the second section  112  may be extended in a second direction (negative X-direction) relative to a junction of the second section  112  and the first section  111 , the third section  113  may be extended in a third direction (negative Y-direction) relative to a junction of the third section  113  and the second section  112 , and the fourth section  114  may be extended in a fourth direction (positive X-direction) relative to a junction of the fourth section  114  and the third section  113 . In addition, the fifth section  121  may be extended in the third direction (negative Y-direction) relative to the feeding portion  10 , and the sixth section  122  may be extended in the fourth direction (positive X-direction) relative to a junction of the sixth section  122  and the fifth section  121 . Further, the seventh section  21  of the second radiation element  2  may be extended in the third direction (negative Y-direction) relative to a junction (such as an abutting spot  200  of the second radiation element  2 ) of the seventh section  21  and grounding element  3 , and the eighth section  22  may be extended in the fourth direction (positive X-direction) relative to a junction of the eighth section  22  and the seventh section  21 . It should be noted that, the aforementioned directional extensions of the sections of the first radiation element  1  and the second radiation element  2  are exemplified, and the present disclosure is not limited thereto. 
     In the first embodiment, the operating frequency band generated by the first radiation element  1  is greater than the operating frequency band generated by the second radiation element  2 . Specifically, the center frequency of the operating frequency band generated by the first radiation element  1  is greater than the center frequency of the operating frequency band generated by the second radiation element  2 . In one of the implementations, the first radiation element  1  generates the operating frequency band of between 1710 MHz and 2690 MHz, and the second radiation element  2  generates the operating frequency band of between 698 MHz and 960 MHz, but the present disclosure is not limited thereto. In addition, an operating frequency band generated by the second radiation portion  12  is greater than an operating frequency band generated by the first radiation portion  11 . Specifically, a center frequency of the operating frequency band generated by the second radiation portion  12  is greater than a center frequency of the operating frequency band generated by the first radiation portion  11 . In one of the implementations, the first radiation portion  11  generates an operating frequency band of between 1710 MHz and 2100 MHz, and the second radiation portion  12  generates an operating frequency band of between 2100 MHz and 2690 MHz, but the present disclosure is not limited thereto. 
     Referring to  FIG. 2  to  FIG. 4 , in conjunction with  FIG. 7 , from comparing  FIG. 7  with  FIG. 2  to  FIG. 4 , it can be observed that in the implementation of  FIG. 7 , the first radiation element  1  and the second radiation element  2  are respectively disposed on two opposite surfaces of the same substrate S. Specifically, the substrate S is disposed between the first casing H 1  and the second casing H 2 , and the substrate S has a first surface S 101  and a second surface S 102  opposite to the first surface S 101 . The first radiation element  1  and grounding element  3  are disposed on the first surface S 101 , and the second radiation element  2  is disposed on the second surface S 102 . It should be noted that, since in the implementation of  FIG. 7 , the first radiation element  1 , the grounding element  3  and the second radiation element  2  are disposed on the same substrate S, the grounding element  3  and the second radiation element  2  may be electrically connected by the grounding conductive element C. The grounding conductive element C may be an electrical conductor in a via hole, which is electrically connected between the grounding element  3  and the second radiation element  2 . In addition, it should be noted that, the second casing H 2  has at least a non-metal area H 20  corresponding to the contours of the second radiation element  2 . Further, the orthogonal projection of the second radiation element  2  on the second casing H 2  at least partially overlaps with the non-metal area H 20 . Preferably, in another implementation, the second casing H 2  further has a non-metal area (not shown in the figures) corresponding to the contours of the first radiation element  1 , and the orthogonal projection of the first radiation element  1  on the second casing H 2  at least partially overlaps with the non-metal area (not shown in the figures). It should be noted that, compared to the implementation of  FIG. 3 , in the implementation of  FIG. 7 , a non-metal element may be filled in a groove on the second casing H 2  so as to seal the groove. 
     Second Embodiment 
     Firstly, referring to  FIG. 8  to  FIG. 10 , it can be observed from a comparison of  FIG. 8  to  FIG. 10  and  FIG. 2  to  FIG. 4  that a structure of the first radiation element  1  and the second radiation element  2  provided in the second embodiment is different from the structure of the first radiation element  1  and the second radiation element  2  provided in the first embodiment. That is, the first radiation element  1  and the second radiation element  2  provided in the second embodiment are disposed on the same surface of the second substrate S 2 . In addition, it should be noted that, the other structures of the electronic device U provided in the second embodiment are the same as those provided in the aforementioned first embodiment, and will not be reiterated herein. 
     Specifically, the electronic device U includes a first radiation element  1 , a second radiation element  2 , a grounding element  3  and a feeding element  4 . The first radiation element  1  has a first radiation portion  11  and a feeding portion  10  electrically connected to the first radiation portion  11 , the second radiation element  2  is coupled to the first radiation element  1  and is separate from the first radiation element  1 , and the grounding element  3  is electrically connected to the second radiation element  2 . The feeding element  4  includes a feeding end  41  and a grounding end  42 , the feeding end  41  is electrically connected to the feeding portion  10  and the grounding end  42  is electrically connected to the grounding element  3 . In addition, the operating frequency band generated by the first radiation element  1  is greater than the operating frequency band generated by the second radiation element  2 . Specifically, a center frequency of a first operating frequency band is greater than a center frequency of a second operating frequency band. In one of the implementations, the first radiation element  1  mainly generates an operating frequency band of between 1710 MHz and 2690 MHz, and the second radiation element  2  mainly generates an operating frequency band of between 698 MHz and 960 MHz, but the present disclosure is not limited thereto. 
     Further, the electronic device U may further include a first substrate S 1 , a second substrate S 2 , a first casing H 1  and a second casing H 2 ; wherein the first substrate S 1  is disposed on the first casing H 1 , and the second substrate S 2  is disposed on the second casing H 2 . In addition, in the second embodiment, the first radiation element  1  and the second radiation element  2  are disposed on the same surface of the second substrate S 2 , and the grounding element  3  may be disposed on the first substrate S 1 . It should be noted that the material of the first casing H 1  may be metal, the material of the second casing H 2  may also be metal, and when the material of the first casing H 1  is metal, the grounding element  3  may be electrically connected to the first casing H 1 . Further, it should be particularly noted that, the second casing H 2  has at least a non-metal area H 20  corresponding to the contours of the first radiation element  1  and the second radiation element  2 , and the orthogonal projection of the first radiation element  1  and the second radiation element  2  on the second casing H 2  at least partially overlaps with the non-metal area H 20 . Preferably, in one implementation, an area of the orthogonal projection of the first radiation element  1  and the second radiation element  2  on the second casing H 2  is less than an area of the non-metal area H 20 , and the orthogonal projection of the first radiation element  1  and the second radiation element  2  on the second casing H 2  completely overlaps on the non-metal area H 20 . In addition, referring to  FIG. 9 , the non-metal area H 20  may be a groove on the second casing H 2 , whereas in other implementations the non-metal area H 20  may be formed by filling a non-metal element in the groove on the second casing H 2 , but the present disclosure is not limited in a manner that the non-metal area H 20  is formed on the second casing H 2 . 
     Further, referring to  FIG. 8  to  FIG. 10 , in conjunction with  FIG. 11 , the present disclosure is exemplified with the material of the first casing H 1  and the second casing H 2  being metal, the orthogonal projection of the first radiation element  1  on the first casing H 1  at least partially or completely overlapping with a metal area (not labeled in the figures) on the first casing H 1 , the orthogonal projection of the second radiation element  2  on the first casing H 1  at least partially or completely overlapping with a metal area (not labeled in the figures) on the first casing H 1 , and the orthogonal projections of the first radiation element  1  and the second radiation element  2  on the second casing H 2  at least partially overlapping with the non-metal area H 20  on the second casing H 2 . It should be noted that, in other implementations, the orthogonal projection of the second radiation element  2  on the second casing H 2  may at least partially overlap with the non-metal area H 20  on the second casing H 2 , and the orthogonal projection of the first radiation element  1  on the second casing H 2  does not overlap with the non-metal area H 20  on the second casing H 2 . In other words, in the second embodiment, the non-metal area H 20  on the second casing H 2  at least partially overlaps with the orthogonal projection of the second radiation element  2  on the second casing H 2 . 
     Further, when the first casing H 1  and the second casing H 2  are stacked together as shown in  FIG. 1 , the first casing H 1  and the second casing H 2  may have a distance there-between, and the first substrate S 1 , the second substrate S 2 , the first radiation element  1 , and the second radiation element  2  are disposed between the first casing H 1  and the second casing H 2 . Further referring to  FIG. 11 , in the second embodiment, the first radiation element  1  and the second radiation element  2  are disposed on the second substrate S 2 , so that the first radiation element  1  and the first casing H 1  may have a first predetermined distance G 1  greater than 5 mm there-between, and the second radiation element  2  and the first casing H 1  have a second predetermined distance G 2  greater than 5 mm there-between. Since the material of at least one of the first casing H 1  and the second casing H 2  is metal, a structure of the first radiation element  1  and the first casing H 1  having a first predetermined distance G 1  and the second radiation element  2  and the first casing H 1  having a second predetermined distance G 2  may be used to prevent the first casing H 1  and/or second casing H 2  from negatively affecting the radiation efficiency of the first radiation element  1  and the second radiation element  2 . 
     Referring to  FIG. 8  to  FIG. 10 , in the second embodiment, since the first radiation element  1  and the second radiation element  2  are disposed on the second substrate S 2 , and the grounding element  3  is disposed on the first substrate S 1 , the electronic device U of the second embodiment can further include a first conductive element C 1  and a second conductive element C 2  so as to use the first conductive element C 1  for signal feeding and the second conductive element C 2  for grounding. Specifically, the first conductive element C 1  and the second conductive element C 2  are disposed on the first substrate S 1 , and the first conductive element C 1  is separate and insulated from the second conductive element C 2 . The first conductive element C 1  is electrically connected between the feeding end  41  of the feeding element  4  and the first radiation element  1 , and the second conductive element C 2  is electrically connected between the grounding element  3  and the second radiation element  2 . In addition, the feeding end  41  of the feeding element  4  is electrically connected to the first conductive element C 1 , and the first conductive element C 1  includes a conductive elastic metal element (not labeled in the figures) that abuts against an abutting spot  100  on the first radiation element  1 . The conductive elastic metal element of the first conductive element C 1  is abutted to the abutting spot  100  on the first radiation element  1 , such that the feeding end  41  is electrically connected to the feeding portion  10  of the first radiation element  1 . In addition, the second conductive element C 2  is disposed on the grounding element  3  and the second conductive element C 2  is electrically connected between the second radiation element  2  and the grounding element  3 , such that the grounding element  3  is electrically connected to the second radiation element  2  through the second conductive element C 2 . In addition, the second conductive element C 2  may abut against an abutting spot  200  of the second radiation element  2  such that the grounding element  3  is electrically connected to the second radiation element  2 . Further, the second conductive element C 2  may be a conductive elastic metal element, such as a spring or a resilient member. In addition, in the second embodiment, the implementation of the first conductive element C 1  and the second conductive element C 2  being disposed on the first substrate S 1 , and the first conductive element C 1  being used for feeding signal to the first radiation element  1 , and the second conductive element C 2  being used for grounding the second radiation element  2  is exemplified. In other implementations, the first conductive element C 1  and the second conductive element C 2  may be disposed on the second substrate S 2 , where the first conductive element C 1  may be disposed on the first radiation element  1  and the second conductive element C 2  may be disposed on the second radiation element  2 . The present disclosure is not limited to the specific structure of the first conductive element C 1  and the second conductive element C 2 . 
     Reference is made to  FIG. 8  to  FIG. 10  again, in conjunction with  FIG. 12 , where the specific structure of the first radiation element  1  and the second radiation element  2  is described as follows, and the following description is an example of the use state of the first radiation element  1 , the second radiation element  2  and the grounding element  3  when the first casing H 1  and the second casing H 2  of the electronic device U of the first embodiment are stacked together. Specifically, in the second embodiment, the first radiation element  1  further has a second radiation portion  12  electrically connected to the first radiation portion  11 , and the feeding portion  10  is electrically connected between the first radiation portion  11  and the second radiation portion  12 . Referring to  FIG. 12 , the first radiation portion  11  has a first section  111  connected to the feeding portion  10 , a second section  112  connected to the first section  111  and bent relative to the first section  111 , a third section  113  connected to the second section  112  and bent relative to the second section  112 , and a fourth section  114  connected to the third section  113  and bent relative to the third section  113 . In addition, the second radiation portion  12  has a fifth section  121  connected to the feeding portion  10 , a sixth section  122  connected to the fifth section  121  and bent relative to the fifth section  121 . In addition, the second radiation element  2  has a seventh section  21  electrically connected to the grounding element  3 , an eighth section  22  connected to the seventh section  21  and bent relative to the seventh section  21 , a ninth section  23  connected to the eighth section  22  and bent relative to the eighth section  22 , and the abutting spot  200  of the second radiation element  2  is positioned on the seventh section  21 . It should be noted that, the present disclosure is not limited to a specific shape of the first radiation element  1  and the second radiation element  2 . In addition, the aforementioned directional extensions of the sections of the first radiation element  1  and the second radiation element  2  shown in  FIG. 12  are exemplified, and the present disclosure is not limited thereto. 
     In the second embodiment, the operating frequency band generated by the first radiation element  1  is greater than the operating frequency band generated by the second radiation element  2 . Specifically, the center frequency of the operating frequency band generated by the first radiation element  1  is greater than the center frequency of the operating frequency band generated by the second radiation element  2 . In one of the implementations, the first radiation element  1  generates the operating frequency band of between 1710 MHz and 2690 MHz, and the second radiation element  2  generates the operating frequency band of between 698 MHz and 960 MHz, but the present disclosure is not limited thereto. In addition, an operating frequency band generated by the second radiation portion  12  is greater than an operating frequency band generated by the first radiation portion  11 . Specifically, a center frequency of the operating frequency band generated by the second radiation portion  12  is greater than a center frequency of the operating frequency band generated by the first radiation portion  11 . In one of the implementations, the first radiation portion  11  generates an operating frequency band of between 1710 MHz and 2100 MHz, and the second radiation portion  12  generates an operating frequency band of between 2100 MHz and 2690 MHz, but the present disclosure is not limited thereto. 
     In conclusion, by virtue of “the second radiation element  2  is coupled to the first radiation element  1  and is separate from the first radiation element  1 ”, an electronic device U of the present disclosure uses a first radiation element  1  and a second radiation element  2  to respectively generate two different operating frequency bands, and the operating frequency band generated by the first radiation element  1  is greater than the operating frequency band generated by the second radiation element  2 . 
     Furthermore, an antenna module A of the electronic device U of the present disclosure is preferably applied to a structure where the material of a first casing H 1  is metal and the material of a second casing H 2  is non-metal, or a structure where the material of the first casing H 1  and the second casing H 2  are both metal. In other words, the present disclosure may be applied to a structure where the material of at least one of the first casing H 1  and the second casing H 2  is metal. In addition, the present disclosure prevents the first casing H 1  and/or second casing H 2  from negatively affecting the radiation efficiency of the first radiation element  1  and the second radiation element  2  by using the technical solutions of the first radiation element  1  and the first casing H 1  having a first predetermined distance G 1  greater than 0.1 mm there-between, and the second radiation element  2  and the first casing H 1  having a second predetermined distance G 2  greater than 5 mm there-between. 
     The foregoing description of the exemplary embodiments of the disclosure has been presented only for the purposes of illustration and description and is not intended to be exhaustive or to limit the disclosure to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. 
     The embodiments were chosen and described in order to explain the principles of the disclosure and their practical application so as to enable others skilled in the art to utilize the disclosure and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present disclosure pertains without departing from its spirit and scope.