[0027] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following describes the present invention clearly and completely with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0028] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or a central component may also exist. When a component is considered to be "connected" to another component, it can be directly connected to another component or there may be a centered component at the same time. When a component is considered to be "installed on" another component, it can be directly installed on another component or a centered component may exist at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items.
[0030] Also refer to figure 1 with figure 2 Shown is a schematic diagram of the metal back cover of the communication terminal provided by the present invention.
[0031] The antenna system 100 is arranged on the metal back cover 1 of the communication terminal 200, and a metal frame 2 extending from the back of the communication terminal 200 to the side is provided on the edge of the metal back cover 1. The metal back cover 1, the metal frame 2 and the front frame (not shown in the figure) of the communication terminal 200 can form a cavity after being assembled, and a metal structure supporting plate for supporting the communication terminal 200 is provided in the cavity (Not shown in the figure) and printed circuit boards (PCB) (not shown in the figure) used to carry various electronic components.
[0032] In addition to the front display screen of the communication terminal 200, the sides and the back of the communication terminal 200 are all metal, which can improve the metal texture of the whole machine.
[0033] In this embodiment, the metal back cover 1 is divided into sections in a cross-cut manner. The metal back cover 1 is divided into a first metal back cover 11 at the upper part, a second metal back cover 12 at the middle part, and The third metal back cover 13 is located in the lower part. The first metal back cover 11, the second metal back cover 12 and the third metal back cover 13 are coplanar but not connected to each other. In other words, a first micro gap group 111 is provided between the first metal back cover 11 and the second metal back cover 12, and a second micro gap group is provided between the second metal back cover 12 and the third metal back cover 13 112.
[0034] The first micro-slit group 111 and the second micro-slit group 112 are formed by the intersection of the gap 113 and the metal medium 114, wherein the width of the gap 113 is less than 0.6 mm, and the width of the metal medium 114 between the gaps 113 is less than 1.5 mm. Each micro-slit group includes at least two slits 113.
[0035] In this embodiment, the gap 113 is filled with a dielectric. The dielectric may be made of non-conductive materials such as plastic, glass, ceramics, etc.
[0036] In the above-mentioned embodiment, the metal back cover 1 using the micro-slit group can reduce the sense of splitting, which is more aesthetic and affinity than the three-section metal back cover directly using the crosscut. In addition, the second metal back cover 12 occupies most of the entire metal back cover 1, which can give people a better overall feeling.
[0037] It should be noted that the metal back cover 1 can also be divided into a first metal back cover 11 at the upper part and a second metal back cover 12 at the lower part. That is, the second metal back cover 12 and the third metal back cover 13 mentioned above may not be separated in sections.
[0038] The left and right sides in the following are figure 1 The direction of the metal back cover 1 shown is the reference direction.
[0039] Refer to image 3 Shown is a schematic diagram of the structure of the antenna of the antenna system of the present invention.
[0040] In this embodiment, the first metal back cover 11 can be used as the antenna radiation body of the antenna system 100. Specifically, the left area of the first metal back cover 11 may be configured as the first antenna radiation body 20, and the right area of the first metal back cover 11 may be configured as the second antenna radiation body 30. Wherein, in this embodiment, the first antenna radiation body 20 may be the radiation body of a WBG (Wi-Fi/Bluetooth/GPS) antenna, and the second antenna radiation body 30 may be the radiation body of the main antenna.
[0041] The second metal back cover 12 can be used as the main ground of the antenna system 100. The main ground refers to the reference ground, that is, the zero potential, which is the reference terminal of the potential of other points, and is the common terminal that forms the circuit signal loop.
[0042] In the above embodiment, the first metal back cover 11 is set as the common radiation body of the WBG antenna and the main antenna, which can meet the communication requirements of the WBG antenna and the main antenna at the same time. The main antenna is mainly in the form of an inverted-F antenna (Inverted-FAntenna, IFA), PIFA (Planar Inverted-F Antenna, PIFA) or a monopole (Monopole) antenna.
[0043] In this embodiment, the first metal back cover 11 is also provided with a ground point 21 to electrically connect the antenna radiation body and the main ground. The ground point 21 is arranged between the first antenna radiation body 20 and the second antenna radiation body 30. Preferably, the ground point 21 is arranged close to the first antenna radiation body 20.
[0044] In the above-mentioned embodiment, the antenna radiating body of the antenna system 100 is connected to the main ground through the grounding point 21, and the first antenna radiating body 20 and the second antenna radiating body 30 can also be isolated to avoid signal interference.
[0045] In this embodiment, the grounding point 21 may be grounded through a camera, or may be connected to the ground on the PCB main board to achieve grounding, and may also be grounded through two or more (for example, 3) grounding points.
[0046] In this embodiment, the first metal back cover 11 is further provided with a coupling antenna 22, and the coupling antenna 22 is provided on the left side of the first metal back cover 11. Preferably, all or part of the area of the coupling antenna 22 may be set within a range of 5 mm from the first antenna radiation body 20. The lower end of the coupling antenna 22 is also connected to the main ground or connected to a ground point on the PCB board for grounding.
[0047] In the above-mentioned embodiment, by setting the shape and length of the coupling antenna 22, the radiation direction of the WBG antenna can be effectively adjusted so that the radiation direction of the WBG antenna is upward, thereby improving the performance of GPS positioning.
[0048] In this embodiment, a first antenna feed point 23 is also provided on the first metal back cover 11. The first antenna feed point 23 can be directly fed into any position of the first metal back cover 11.
[0049] In addition, the first antenna feed point 23 can also be fed into any position of the first metal back cover 11 through a connector (not shown in the figure). The connecting member may be a spring sheet or a thimble. Preferably, the first antenna feed point 23 is directly fed at a distance of 12 mm from the left edge of the first metal back cover 11.
[0050] The first antenna feed point 23 is a metal point of the conductive part on the first antenna radiating body 20, and the first antenna feed point 23 is used as an input terminal and can be directly connected to the first feed source on the PCB twenty four.
[0051] In other embodiments, in order to increase the wear resistance and oxidation resistance of the first antenna feed point 23, the first antenna feed point 23 may be electroplated with gold.
[0052] In other embodiments, a passive device 25 may be provided on the first antenna radiating body 20 to electrically connect the first antenna radiating body 20 and the main ground. Specifically, the passive device 25 is arranged 6 mm away from the left edge of the first metal back cover 11. The active device may be an inductor, a capacitor or a resistor.
[0053] In other embodiments, the first antenna radiation body 20 may not be provided with any passive components 25.
[0054] In this embodiment, the first metal back cover 11 is further provided with an extension 32 of the second antenna radiating body 30, and the extension 32 is connected to the right edge of the first metal back cover 11. By adjusting the length of the extension branch 32, the resonance frequency of the second antenna can be effectively adjusted to meet different communication requirements of users.
[0055] In some embodiments, the length of the extension branch 32 is 20 mm.
[0056] In this embodiment, a second antenna feed point 33 is provided on the first metal back cover 11. The second antenna feed point 33 can be directly fed into any position of the first metal back cover 11.
[0057] In addition, the second antenna feed point 33 can also be fed into any position of the first metal back cover 11 through a connector (not shown in the figure). The connecting member may be a spring sheet or a thimble. Preferably, the second antenna feed point 33 feeds directly 15 mm from the right side of the ground point 21.
[0058] The second antenna feed point 33 is a metal point of the conductive part on the second antenna radiating body 30, and the second antenna feed point 33 is used as an input terminal and can be directly connected to the second feed source on the PCB 34.
[0059] In other embodiments, in order to increase the wear resistance and oxidation resistance of the second antenna feed point 33, the second antenna feed point 33 may be electroplated with gold.
[0060] In other embodiments, at least one active device 35 may be provided on the first metal back cover 11 to electrically connect the antenna radiation body and the main ground. Specifically, the active device 35 is arranged at a distance of 20 mm from the right edge of the first metal back cover 11.
[0061] The active device 35, for example, may be a switch with multiple state switching, or may be a variable capacitor. The switch with multiple state switching is an antenna switch in the prior art, including but not limited to a single pole four throw switch, a single pole double throw switch, and the like.
[0062] In this embodiment, the resonant frequency of the antenna can be adjusted by the active device 35, so that the antenna can be in multiple resonance states to meet different needs of users.
[0063] Please refer to Figure 4 , Is a schematic diagram of the structure of the single-pole double-throw switch used in the present invention.
[0064] The single-pole double-throw switch 101 includes two branches, one of which is connected in series with an electronic component 1011, and the other branch is connected in series with an electronic component 1012. The electronic components (1011, 1012) can be capacitors, inductors or resistors.
[0065] In this embodiment, one end of the SPDT switch 101 (for example, the port C shown in the figure) is connected to the antenna radiation body, and the other end of the SPDT switch 101 (for example, the port D shown in the figure) is connected to the main body. Ground.
[0066] In other embodiments, one end of the SPDT switch 101 (for example, the D port shown in the figure) is connected to the antenna radiation body, and the other end of the SPDT switch 101 (for example, the C port shown in the figure) is connected to the main body. Ground.
[0067] Under the control of the internal circuit of the communication terminal 200, the single-pole double-throw switch 101 can make one branch turn on and the other branch off. Through the control of the circuit, the SPDT switch 101 can be in two different working states, so that the antenna can cover different frequency bands to meet the requirements of different application scenarios.
[0068] See Figure 5 Shown is a schematic diagram of the return loss when the second antenna of the present invention feeds the second antenna feed point.
[0069] In this embodiment, image 3 The active device 35 in FIG. 1 uses the single-pole double-throw switch 101 as an example to illustrate how to adjust the resonant frequency of the antenna. among them, Figure 5 The middle horizontal direction represents the frequency, and the vertical direction represents the return loss at different frequency points. Obviously, the return loss of the SPDT switch 101 in the first state is as Figure 5 As shown in the diagram on the left, the return loss of the SPDT switch 101 in the second state is as Figure 5 The diagram on the right is shown. It can be seen that when the SPDT switch 101 is in different states, the resonance frequency of the antenna system 100 is different. In this embodiment, the antenna system 100 has two resonance states, which can meet the communication requirements of 700MHz-960MHz and 1700MHz-2700MHz.
[0070] It should be noted that the above-mentioned active device 35 uses the single-pole double-throw switch 101 as an example to illustrate how to adjust the resonant frequency of the antenna, but the active device 35 that adjusts the resonant frequency of the second antenna is not limited to the above-mentioned embodiment, and can be based on The frequency points required to be covered need to be set, which is not limited in the present invention. In the actual debugging process, the active device 35 may also exist in multiple states to meet different communication requirements.
[0071] See Image 6 Shown is a schematic diagram of the return loss when the first antenna of the present invention feeds the first antenna feed point.
[0072] Image 6 The middle horizontal direction represents the frequency, and the vertical direction represents the return loss at different frequency points. Obviously, the antenna system 100 has a resonance state, wherein the low frequency near 1.575 GHz corresponds to the GPS communication frequency, which can satisfy GPS communication. The intermediate frequency near 2.45GHz corresponds to Wi-Fi and Bluetooth communication frequencies, which can meet Wi-Fi2.4G and Bluetooth communication. The high frequency near 5.5GHz corresponds to the Wi-Fi 5G communication frequency, which can meet Wi-Fi 5G communication. Among them, the high frequency around 5.5 GHz may not exist. It can be seen from this that when the SPDT switch 101 is in different states, the resonance frequency of the antenna system 100 is different.
[0073] Figure 7 It is a schematic structural diagram of a preferred embodiment of a communication terminal provided by the present invention.
[0074] The communication terminal 200 provided by the present invention includes the antenna system 100 described above.
[0075] Although not shown, the communication terminal 200 may also include other components, such as a display screen, a memory, etc., which are not related to the improvement of the present invention, so they are not described here.
[0076] The communication terminal 200 may be a mobile phone, a tablet computer, an e-book, an electronic photo frame, a digital camera, etc., a communication terminal with wireless communication functions (for example, GPRS communication, WIFI communication, Bluetooth communication, etc.). It should be noted that the communication terminal 200 is only an example, and other existing or future electronic products that can be adapted to the present invention should also be included in the protection scope of the present invention and included here by reference. .
[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements are made without departing from the spirit and scope of the technical solution of the present invention.
