Patent Publication Number: US-2023155275-A1

Title: Terminal

Description:
This application claims priority to Chinese Patent Application No. 202010117703.8, filed with the China National Intellectual Property Administration on Feb. 25, 2020 and entitled “TERMINAL”, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     This application relates to the field of communications technologies, and in particular, to a terminal. 
     BACKGROUND 
     Because a posture of a terminal is uncertain during use of the terminal, in a process of implementing wireless communication, a directivity factor of an antenna needs to be reduced as much as possible, so that a requirement of communication in each azimuth is better covered. In addition, as specified in the industry, a wireless fidelity (Wireless Fidelity, Wi-Fi) antenna needs to have either a relatively low directivity factor or relatively low transmit power of the antenna. For a conventional terminal Wi-Fi antenna, directivity factor optimization of the antenna is mainly implemented by adjusting a layout position of the antenna in an entire system. If the layout position of the antenna is limited, it is difficult to control a directivity factor because of impact am entire-system environment. Therefore, when the layout position of the conventional Wi-Fi antenna is limited, transmit power of the antenna is limited because the directivity factor of the antenna is relatively large. 
     SUMMARY 
     Technical solutions of this application provide a terminal, to reduce a directivity factor of a Wi-Fi antenna when a layout position of the antenna is limited, thereby improving transmit power of the antenna. 
     According to a first aspect, the technical solutions of this application provide a terminal, including a terminal body part and an electronic accessory part. A Wi-Fi antenna apparatus is disposed on the terminal body part, the Wi-Fi antenna apparatus has a closed slot antenna, the closed slot antenna includes a main straight slot and a first slot and a second slot that are separately bent from two ends of the main straight slot and extend to a same side of the main straight slot, both the first slot and the second slot are perpendicular to the main straight slot, and the electronic accessory part is located on a side surface of the main straight slot. 
     Optionally, the terminal body part is a flat-panel structure, the terminal body part includes two opposite main surfaces and a side surface connecting the two main surfaces, an antenna slot of the closed slot antenna is disposed on one of the two main surfaces, and the electronic accessory part is detachably connected to a relative position of the side surface of the terminal body part. 
     Optionally, the antenna slot of the closed slot antenna is shaped in “U” or non-closed square. 
     Optionally, the terminal body part is a tablet computer, and the electronic accessory part is a stylus. 
     Optionally, the terminal is a notebook computer, the terminal body part is a computer body part, and the terminal body part includes an upper housing and a lower housing that are opposite and four side housings connecting the upper housing and the lower housing. The electronic accessory part is a display, the terminal body part has a hinge area on a side edge of one side housing, and the electronic accessory part is connected to the terminal body part in the hinge area by a hinge. The closed slot antenna is located on the side housing corresponding to the hinge area. 
     Optionally, when the notebook computer is in a folded state, a display surface of the electronic accessory part is facing to the upper housing of the terminal body part. The upper housing of the terminal body part is a ground electrically connected to the closed slot antenna. 
     Optionally, the antenna slot of the closed slot antenna is shaped in non-closed square. 
     Optionally, an end of the antenna slot of the closed slot antenna is located on a side that is of the antenna slot and that is close to the upper housing of the terminal body part. 
     In the terminal in embodiments of this application, the first slot and the second slot that are separately bent from two ends of the main straight slot and to the same side of the main straight slot are disposed, so that electric fields at the first slot and the second slot offset against each other. Therefore, when a layout position of the Wi-Fi antenna is limited, radiation intensity of the antenna in a same direction can be reduced, in other words, a directivity factor of the antenna is reduced, so that transmit power of the antenna is improved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic diagram of a structure of a tablet computer according to the conventional technology; 
         FIG.  2    is a radiation pattern of a Wi-Fi antenna of the tablet computer in  FIG.  1   ; 
         FIG.  3    is a side view of a notebook computer according to the conventional technology; 
         FIG.  4    is a schematic diagram of a three-dimensional structure of the notebook computer in  FIG.  3   ; 
         FIG.  5    is a schematic diagram of an enlarged structure of an area B in  FIG.  4   ; 
         FIG.  6    is a schematic diagram of an enlarged structure of a part of side surface of the notebook computer in  FIG.  3   ; 
         FIG.  7    is a schematic diagram of a cross-sectional structure in a direction AA′ in  FIG.  6   ; 
         FIG.  8    is a radiation pattern of a Wi-Fi antenna of the notebook computer in  FIG.  3   ; 
         FIG.  9    is a schematic diagram of a three-dimensional structure of a terminal according to an embodiment of this application; 
         FIG.  10    is a top view of the terminal in  FIG.  9   ; 
         FIG.  11    is a radiation pattern of a Wi-Fi antenna of the terminal in  FIG.  10   ; 
         FIG.  12    is a top view of another terminal according to an embodiment of this application; 
         FIG.  13    is a radiation pattern of a Wi-Fi antenna of the terminal in  FIG.  12   ; 
         FIG.  14    is a schematic diagram of a three-dimensional structure of another terminal according to an embodiment of this application; 
         FIG.  15    is a schematic diagram of an enlarged structure at a closed slot antenna in  FIG.  14   ; 
         FIG.  16    is a schematic diagram of a cross-sectional structure in a direction EE′ in  FIG.  15   ; and 
         FIG.  17    is a radiation pattern of a Wi-Fi antenna of the terminal in  FIG.  14   . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Terms used in embodiments of this application are only used to explain specific embodiments of this application, but are not intended to limit this application. 
     Before embodiments of this application are described, a problem in the conventional technology is first briefly described.  FIG.  1    is a schematic diagram of a structure of a tablet computer according to the conventional technology.  FIG.  2    is a radiation pattern of a Wi-Fi antenna of the tablet computer in  FIG.  1   .  FIG.  1    is a schematic diagram of a structure of a tablet computer. A stylus is disposed on a side surface of a body  1 ′ of the tablet computer. Being limited by an appearance or another reason, a position of a Wi-Fi antenna  3 ′ is located near the stylus, and a straight closed slot antenna design is usually used. A 2.4 GHz Wi-Fi antenna is used as an example. As shown in  FIG.  2   , because of impact on antenna radiation that is caused by the stylus, a radiation intensity difference between upper and lower sides of an antenna slot is relatively large, and therefore a directivity factor of the antenna is relatively large and reaches 7.5 dBi. In addition, refer to  FIG.  3    to  FIG.  8   .  FIG.  3    is a side view of a notebook computer according to the conventional technology.  FIG.  4    is a schematic diagram of a three-dimensional structure of the notebook computer in  FIG.  3   .  FIG.  5    is a schematic diagram of an enlarged structure of an area B in  FIG.  4   .  FIG.  6    is a schematic diagram of an enlarged structure of a part of side surface of the notebook computer in  FIG.  3   .  FIG.  7    is a schematic diagram of a cross-sectional structure in a direction AA′ in  FIG.  6   .  FIG.  8    is a radiation pattern of a Wi-Fi antenna of the notebook computer in  FIG.  3   . The notebook computer includes a screen  4 ′ and a body part  5 ′. The body part  5 ′ includes an upper housing  51 ′, a lower housing  52 ′. and a side housing  53 ′ close to a hinge. As shown in  FIG.  5   , the screen  4 ′ is omitted in FIG,  5 , the side housing  53 ′ close to the hinge has a recessed area C, and a Wi-Fi antenna  6 ′ is disposed in the area C. A specific structure of the Wi-Fi antenna  6 ′ is omitted in  FIG.  5   . As shown in  FIG.  6    and  FIG.  7   , to maintain a product appearance to the greatest extent, the antenna  6 ′ is usually disposed in the recessed area C. A conventional antenna  6 ′ is designed in a form of an inverted-F antenna (Inverted-F Antenna, IFA). A feed position D is located between the antenna  6 ′ and the lower housing  52 ′. The lower housing  52 ′ is grounded. A 2.4 GHz Wi-Fi antenna is used as an example. As shown in  FIG.  8   , because of impact on the antenna that is caused by the screen  4 ′, a radiation intensity difference between upper and lower sides of the antenna is relatively large, and therefore a directivity factor of the antenna is relatively large and reaches at least 8 dBi. 
     The following describes embodiments of this application. Refer to  FIG.  9    and  FIG.  10   .  FIG.  9    is a schematic diagram of a three-dimensional structure of a terminal according to an embodiment of this application.  FIG.  10    is a top view of the terminal in  FIG.  9   . An embodiment of this application provides a terminal, including a terminal body part  1  and an electronic accessory part  2 . A antenna apparatus is disposed on the terminal body part  1 , the antenna apparatus has a closed slot antenna  3 , the closed slot antenna  3  includes a main straight slot  30  and a first slot  31  and a second slot  32  that are separately bent from two ends of the main straight slot  30  and extend to a same side of the main straight slot  30 , both the first slot  31  and the second slot  32  are perpendicular to the main straight slot  30 , and the electronic accessory part  2  is located on a side surface of the main straight slot  30 . 
     Specifically, electric field directions are consistent on two sides of a slot of the closed slot antenna  3 . For example, in a structure shown in  FIG.  10   , an electric field direction at the main straight slot  30  is from top to bottom, an electric field direction at the first slot  31  is from left to right, and an electric field direction at the second slot  32  is from right to left. Because the first slot  31  and the second slot  32  are opposite, electric fields at the first slot  31  and the second slot  32  offset against each other instead of being superposed, so that radiation enhancement of the antenna in a same direction is reduced. Therefore, when a position at which the closed slot antenna  3  is disposed is limited, although a radiation direction of the closed slat antenna  3  is affected by the electronic accessory part  2  on the side surface of the main straight slot  30  of the closed slot antenna  3 , a directivity factor of the antenna can still be reduced through a slot bending design of the closed slot antenna  3 .  FIG.  11    is a radiation pattern of the Wi-Fi antenna of the terminal in  FIG.  10   . It can be learned that the directivity factor of the Wi-Fi antenna of the terminal in  FIG.  11    is less than that in  FIG.  2   , is close to 3.5 dBi, and is less than a directivity factor of a straight slot antenna. 
     In the terminal in this embodiment of this application, the first slot and the second slot that are bent to the same side from two ends of the main straight slot are disposed, so that the electric fields at the first slot and the second slot offset against each other. Therefore, when the layout position of the Wi-Fi antenna is limited, radiation intensity of the antenna in a same direction can be reduced, in other words, the directivity factor of the antenna is reduced, so that transmit power of the antenna is improved. 
     Optionally, the terminal body part  1  is a flat-panel structure, the terminal body part  1  includes two opposite main surfaces and a side surface connecting the two main surfaces, an antenna slot of the closed slot antenna  3  is disposed on one of the two main surfaces, and the electronic accessory part  2  is detachably connected to a relative position of the side surface of the terminal body part  1 . When the closed slot antenna  3  needs to be located in positions shown in  FIG.  9    and  FIG.  10   , antenna directivity of the closed slot antenna  3  is adversely affected if the electronic accessory part  2  is disposed on the side surface of the terminal body part  1 . However, in this embodiment of this application, because of a bending setting manner of the closed slot antenna  3 , adverse impact on antenna directivity that is caused by the electronic accessory part  2  is reduced, and the directivity factor of the antenna is reduced. 
     Optionally, refer to  FIG.  10    and  FIG.  12   .  FIG.  12    is a top view of another terminal according to an embodiment of this application. An antenna slot of a closed slot antenna  3  is shaped in “U” or non-closed square. 
     Specifically, in the structure shown in  FIG.  10   , the main straight slot  30 , the first slot  31 , and the second slot  32  form a “U”-shaped structure, to form the closed slot antenna  3 . In a structure shown in  FIG.  12   , in addition to the main straight slot  30 , the first slot  31 , and the second slot  32 , the antenna slot of the closed slot antenna  3  includes a third slot  33  and a fourth slot  34 . The third slot  33  is bent and extends to the right from a lower end of the first slot  31 , and the fourth slot  34  is bent and extends to the left from a lower end of the second slot  32 . The main straight slot  30 , the first slot  31 , the second slot  32 , the third slot  33 , and the fourth slot  34  form a structure of non-closed square, to form the closed slot antenna  3 .  FIG.  13    is a radiation pattern of a Wi-Fi antenna of the terminal in  FIG.  12   , It can be learned that a directivity factor of the Wi-Fi antenna of the terminal in  FIG.  13    is less than that in  FIG.  2   , is close to 3.5 dBi, and is less than a directivity factor of a straight slot antenna. 
     Optionally, as shown in  FIG.  9   ,  FIG.  10   , and  FIG.  12   , the terminal body part  1  is a tablet computer, and the electronic accessory part  2  is a stylus. The stylus may be adsorbed on a side surface of the tablet computer. In this case, the antenna slot of the closed slot antenna  3  is located near a rear housing of the tablet computer, and is adjacent to a side on which the stylus is adsorbed. When the stylus is adsorbed on the tablet computer, because of the bending setting manner of the closed slot antenna  3 , adverse impact on antenna directivity that is caused by the stylus is reduced, and the directivity factor of the antenna is reduced. 
     Optionally, refer to  FIG.  14   ,  FIG.  15   , and  FIG.  16   .  FIG.  14    is a schematic diagram of a three-dimensional structure of another terminal according to an embodiment of this application.  FIG.  15    is a schematic diagram of an enlarged structure at a closed slot antenna in  FIG.  14   .  FIG.  16    is a schematic diagram of a cross-sectional structure in a direction EE′ in  FIG.  15   . The terminal is a notebook computer, and a terminal body part  1  is a computer body part, and the terminal body part  1  includes an upper housing  11  and a lower housing  12  that are opposite and four side housings  13  connecting the upper housing  11  and the lower housing  12 . An electronic accessory part  2  is a display, the terminal body part  1  has a hinge area  4  on a side edge of one side housing  13 , and the electronic accessory part  2  is connected to the terminal body part I in the hinge area  4  by a hinge. A closed slot antenna  3  is located on the side housing  13  corresponding to the hinge area  4 . 
     Specifically, for example, an antenna slot of the closed slot antenna  3  may be a slot of the side housing  13 , or an antenna slot of the closed slot antenna  3  may be a slot of a conductive plate disposed on the side housing  13 . The closed slot antenna  3  also includes a main straight slot  30  and a first slot  31  and a second slot  32  that are separately bent from two ends of the main straight slot  30  and extend to a same side of the main straight slot  30 , both the first slot  31  and the second slot  32  are perpendicular to the main straight slot  30 , and the electronic accessory part  2  is located on a side surface of the main straight slot  30 . A position of the closed slot antenna  3  is limited to the side housing  13  corresponding to the hinge area  4 . Therefore, the display causes adverse impact on antenna directivity of the closed slot antenna  3 . In this embodiment of this application, because electric fields at the first slot  31  and the second slot  32  offset against each other, radiation enhancement of the antenna in a same direction is reduced, in other words, a directivity factor of the antenna is reduced, so that transmit power of the antenna is improved. 
     Optionally, as shown in  FIG.  14   ,  FIG.  15   , and  FIG.  16   , when the notebook computer is in a folded state, a display surface of the electronic accessory part  2  is facing to the upper housing  11  of the terminal body part  1 . The upper housing  11  of the terminal body part  1  is a ground electrically connected to the closed slot antenna  3 . 
     Specifically, when the upper housing  11  of the terminal body part  1  is a ground electrically connected to the closed slot antenna  3 , the upper housing  11  of the terminal body part  1  is grounded. The upper housing  11  is located between the display and the closed slot antenna  3 . Radiation impact on the closed slot antenna  3  that is caused by the display is to radiate more radiation beams upward, and the ground reflects radiation of the antenna, in other words, the upper housing  11  enables a radiation beam of the antenna to be reflected downward. Therefore, disposing the upper housing  11  as the ground can reduce adverse impact on a radiation direction of the closed slot antenna  3  that is caused by the display, to further reduce the directivity factor of the antenna, so that transmit power of the antenna is improved. 
     Optionally, as shown in  FIG.  14   ,  FIG.  15   , and  FIG.  16   , the antenna slot of the closed slot antenna  3  is shaped in non-closed square. A height of the side housing  13  of the notebook computer is usually relatively small. To increase an antenna length to meet a requirement, the antenna slot of the closed slot antenna  3  is set to a shape of non-closed square. To be specific, the closed slot antenna  3  further includes a third slot  33  and a fourth slot  34 , the third slot  33  is bent and extends to the right from an upper end of the first slot  31 , the fourth slot  34  is bent and extends to the left from an upper end of the second slot  32 , and the main straight slot  30 , the first slot  31 , the second slot  32 , the third slot  33 , and the fourth slot  34  form a structure of non-closed square, to form the closed slot antenna  3 . 
     Optionally, as shown in  FIG.  14   ,  FIG.  15   , and  FIG.  16   , an end of the antenna slot of the closed slot antenna  3  is located on a side that is of the antenna slot and that is close to the upper housing  11  of the terminal body part  1 . In other words, both an end of the third slot  33  and an end of the fourth slot  34  are located on a side that is of the main straight slot  30  and that is close to the upper housing  11 . For example, the end of the third slot  33  is connected to the upper housing  11 , and a feed point  35  is disposed herein, to separately implement feeding by using the feed point  35  and the upper housing  11 .  FIG.  17    is a radiation pattern of a Wi-Fi antenna of the terminal in  FIG.  14   . It can be learned that a directivity factor of the Wi-Fi antenna of the terminal in  FIG.  17    is less than that in  FIG.  8   , is close to 5.2 dBi, and is less than a directivity factor of an IFA antenna. 
     In embodiments of this application, “at least one” means one or more, and “a plurality of” means two or more. The term “and/or” describes an association relationship for describing associated objects and indicates that three relationships may exist. For example, A and/or B may indicate the following three cases: Only A exists, both A and B exist, and only B exists. A and B may be in a singular form or a plural form. The character “/” generally indicates an “or” relationship between the associated objects. At least one of the following items and similar expressions refer to any combination of the items, including a single item or any combination of plural items. For example, at least one of a, b, and c may indicate a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c may he singular or plural. 
     The foregoing descriptions are merely preferred embodiments of this application, but are not intended to limit this application For a person skilled in the art, various modifications and variations may be made in this application. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of this application shall fall within the protection scope of this application.