Antenna module, middle frame assembly and electronic equipment

Abstract

The invention relates to an antenna module, a middle frame assembly and electronic equipment. The antenna module comprises a main radiator, a first end and a second end of the main radiator are free ends, the main radiator comprises a first grounding point, a feeding point and a second grounding point, the feeding point is connected with a feed source and arranged between the first grounding point and the second grounding point, a first matching circuit is further arranged between the first grounding point and a ground wire, and a second matching circuit is further arranged between the second grounding point and the ground wire. The first grounding point is close to the first end of the main radiator, the second grounding point is close to the second end of the main radiator, and a first wavelength mode generated by the main radiator under excitation of a feed signal output by the feed source is used for supporting the antenna module to work in an intermediate frequency band, the first wavelength mode includes a half wavelength mode from the second ground point to the first end of the main radiator. By adopting the antenna module, the SAR value of the antenna module can be reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an antenna module, a middle frame assembly and an electronic device. Background Art

[0002] With the development of communication technology, in order to improve the user's mobile communication experience, electronic devices have higher and higher requirements for antenna efficiency. In conventional antenna design, higher antenna efficiency often means a higher SAR (Specific Absorption Rate) value of the antenna. Since the SAR value is directly related to the impact of electronic equipment on users during use, how to reduce the SAR value of the antenna has become a technical problem that needs to be solved in antenna design. Summary of the invention

[0003] Based on this, it is necessary to provide an antenna module, a middle frame assembly and an electronic device that can reduce the SAR value of the antenna in order to address the above technical problems.

[0004] In a first aspect, the present application provides an antenna module, the antenna module includes a main radiator, the first end and the second end of the main radiator are both free ends, the main radiator includes a first grounding point, a feeding point, and a second grounding point; the feeding point is connected to a feed source, the feeding point is arranged between the first grounding point and the second grounding point, a first matching circuit is arranged between the first grounding point and the ground line, the first grounding point is close to the first end of the main radiator, and the second grounding point is close to the second end of the main radiator;

[0005] The first wavelength mode generated by the main radiator under the excitation of the feeding signal output by the feed source is used to support the antenna module to operate in the intermediate frequency band, wherein the first wavelength mode includes a half wavelength mode from the second ground point to the first end of the main radiator.

[0006] In a second aspect, the present application further provides a middle frame assembly, the middle frame assembly comprising the antenna module as described in any one of the first aspects above, and the middle frame assembly further comprising:

[0007] substrate, including feed and floor;

[0008] A frame is arranged around the substrate, and the first parasitic branch, the main radiator and the second parasitic branch in the antenna module are arranged on the frame.

[0009] In a third aspect, the present application further provides an electronic device, which includes the middle frame assembly as described in the second aspect above.

[0010] The above antenna module, middle frame assembly and electronic device, the antenna module includes a main radiator, the first end and the second end of the main radiator are both free ends, the main radiator includes a first grounding point, a feeding point and a second grounding point, wherein the feeding point is connected to the feed source, the feeding point is arranged between the first grounding point and the second grounding point, a first matching circuit is also arranged between the first grounding point and the ground wire, the first grounding point is close to the first end of the main radiator, the second grounding point is close to the second end of the main radiator, the first wavelength mode generated by the main radiator under the excitation of the feeding signal output by the feed source is used to support the antenna module to work in the intermediate frequency band, wherein the first wavelength mode includes a half wavelength mode from the second grounding point to the first end of the main radiator. In this way, the main radiator is grounded through the first grounding point and the second grounding point respectively, and the current mode of the antenna module can be increased by increasing the return point, and the half wavelength mode from the second grounding point to the first end of the main radiator supports the operation in the intermediate frequency band, so that the current on the antenna module is relatively dispersed, and the current dispersion can disperse the SAR hotspot, thereby reducing the SAR value of the antenna module. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0012] FIG1 is a schematic diagram of the structure of an antenna module in one embodiment;

[0013] FIG2 is a schematic diagram of current distribution in the intermediate frequency band of an antenna module in one embodiment;

[0014] FIG3 is a schematic diagram of the structure of an antenna module in another embodiment;

[0015] FIG4 is a schematic diagram of current distribution in a low frequency band of an antenna module in another embodiment;

[0016] FIG5 is a current distribution diagram of a high frequency band of an antenna module in another embodiment;

[0017] FIG6 is a schematic diagram of the structure of an antenna module in another embodiment;

[0018] FIG7 is a schematic diagram of the structure of an antenna module in another embodiment;

[0019] FIG8 is a schematic structural diagram of an antenna module in another embodiment;

[0020] FIG9 is a schematic structural diagram of an antenna module in another embodiment;

[0021] FIG. 10 is a diagram showing the internal structure of an electronic device in one embodiment.

[0022] Description of main component numbers:

[0023] Antenna module 100; main radiator 101; feed source 102; first matching circuit 103;

[0024] A first parasitic branch 104; a second parasitic branch 105; a second matching circuit 106;

[0025] First grounding point C; feeding point D; second grounding point E;

[0026] A first coupling gap F; a second coupling gap G;

[0027] A selection switch 1031 ; a first matching branch 1032 ; and a second matching branch 1033 . DETAILED DESCRIPTION

[0028] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] In order to improve the user's mobile communication experience, electronic devices have increasingly higher requirements for antenna efficiency. In conventional antenna design, higher antenna efficiency often also means a higher SAR value of the antenna. Since the SAR value is directly related to the impact of electronic equipment on users during use, how to reduce the SAR value of the antenna has become a technical problem that needs to be solved in antenna design. In existing antenna design schemes, the radiator of the antenna includes a grounding point and a feeding point. Generally, the intermediate frequency antenna is designed through a quarter-wavelength mode of the coupling gap from the feeding point to the radiator and other radiators. Therefore, the branches of the intermediate frequency antenna are shorter and the current distribution is more concentrated. When the current distribution is more concentrated, the SAR value of the antenna will be relatively high.

[0035] In view of this, the embodiments of the present application provide an antenna module, a middle frame assembly and an electronic device, which are grounded through a first grounding point and a second grounding point on the main radiator of the antenna module respectively. By increasing the grounding points, the current mode of the antenna module can be increased. The half-wavelength mode from the second grounding point to the first end of the main radiator supports operation in the intermediate frequency band, so that the current on the antenna module is more dispersed. The current dispersion can disperse the SAR hotspots, thereby reducing the SAR value of the antenna module.

[0036] As shown in Figure 1, it shows a structural schematic diagram of the antenna module provided in an embodiment of the present application. The antenna module 100 includes a main radiator 101, and the first end 101A and the second end 101B of the main radiator 101 are both free ends. The main radiator 101 includes a first grounding point C, a feeding point D and a second grounding point E; the feeding point D is connected to the feed source 102, and the feeding point D is arranged between the first grounding point C and the second grounding point E. A first matching circuit 103 is arranged between the first grounding point C and the ground wire, and the first grounding point C is close to the first end 101A of the main radiator 101, and the second grounding point E is close to the second end 101B of the main radiator 101.

[0037] Among them, the first wavelength mode generated by the main radiator 101 under the excitation of the feeding signal output by the feed source 102 is used to support the antenna module 100 to operate in the intermediate frequency band, wherein the first wavelength mode includes a half wavelength mode from the second ground point E to the first end 101A of the main radiator 101.

[0038] The antenna module 100 may be a mixture of one or more of a flexible printed circuit (FPC) antenna, a laser direct structuring (LDS) antenna, a print direct structuring (PDS) antenna, and a metal branch antenna. It may also be a mechanical design antenna (MDA) antenna designed using the metal insert of the electronic device itself. Of course, the antenna module 100 may also be other types of antennas, which will not be described in detail in the embodiments of the present application.

[0039] Optionally, the main radiator 101 can be arranged on the frame of the electronic device. The main radiator 101 can be a straight-line structure or an L-shaped structure. FIG1 takes the L-shaped structure as an example for illustration. The main radiator 101 is grounded through the first grounding point C and the first matching circuit 103, and the main radiator 101 is grounded through the second grounding point E. The main radiator 101 is connected to the feed source 102 through the feed point D, and a second matching circuit can also be included between the feed point D and the feed source 102 for tuning the antenna module 100.

[0040] Among them, the intermediate frequency band HB band may include the B1 band and the B3 band. Optionally, the length setting of the main radiator 101 is exemplified. For example, the difference between the length between the second grounding point E and the feeding point D and 14 mm may be within the preset range, the difference between the length between the feeding point D and the first end 101A of the main radiator 101 and 24.6 mm may be within the preset range, the difference between the length between the second grounding point E and the L-shaped bending position of the main radiator 101 and 8.77 mm may be within the preset range, and the difference between the length between the L-shaped bending position of the main radiator 101 and the second end 101B and 36.8 mm may be within the preset range. Optionally, the preset range may be 0.5 to 1 mm.

[0041] The half-wavelength mode from the second grounding point E to the first end 101A of the main radiator 101 supports the antenna module 100 to work in the intermediate frequency band. There are multiple grounding points on the main radiator 101, which increases the current mode of the main radiator 101. Through multiple current modes, the performance of the intermediate frequency band can be improved, and the SAR value can be reduced without affecting the efficiency of the antenna module 100. Among them, the current distribution in the intermediate frequency band can be shown in Figure 2. The current on the main radiator 101 includes multiple current modes, and the current is relatively dispersed, so the SAR value can be reduced without affecting the antenna efficiency.

[0042] The "electronic device" (also referred to as "terminal" or "mobile terminal" or "electronic device") mentioned above includes a device for receiving / sending communication signals. It may also be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radiotelephones with data processing, fax and data communication capabilities; PDAs that can include radiotelephones, pagers, Internet / Intranet access, Web browsers, notepads, calendars and / or global positioning system (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers.

[0043] In the above embodiment, the antenna module includes a main radiator, the first end and the second end of the main radiator are both free ends, the main radiator includes a first grounding point, a feeding point and a second grounding point, wherein the feeding point is connected to the feed source, the feeding point is arranged between the first grounding point and the second grounding point, a first matching circuit is also arranged between the first grounding point and the ground wire, the first grounding point is close to the first end of the main radiator, the second grounding point is close to the second end of the main radiator, the first wavelength mode generated by the main radiator under the excitation of the feeding signal output by the feed source is used to support the antenna module to work in the intermediate frequency band, wherein the first wavelength mode includes a half wavelength mode from the second grounding point to the first end of the main radiator. In this way, the main radiator is grounded through the first grounding point and the second grounding point respectively, and the current mode of the antenna module can be increased by increasing the return point, and the half wavelength mode from the second grounding point to the first end of the main radiator supports the operation in the intermediate frequency band, so that the current on the antenna module is relatively dispersed, and the current dispersion can disperse the SAR hotspot, thereby reducing the SAR value of the antenna module.

[0044] In an optional embodiment of the present application, as shown in Figure 3, the antenna module 100 also includes a first parasitic branch 104, and there is a first coupling gap F between the first parasitic branch 104 and the first end 101A of the main radiator 101. The second wavelength mode generated by the main radiator 101 under the excitation of the feeding signal is used to support the antenna module 100 to operate in a low frequency band.

[0045] The second wavelength mode includes a quarter wavelength mode from the second ground point E to the first end 104A of the first parasitic branch 104 . The first end 104A of the first parasitic branch 104 is an end of the first parasitic branch 104 away from the first coupling gap F.

[0046] Optionally, the main radiator 101 and the first parasitic branch 104 are coupled through the first coupling gap F to generate a coupling current to support the low frequency band. The low frequency band LB band may include the B5, B8 and B28 bands. As shown in FIG3 , the first parasitic branch 104 includes a third grounding point, and the difference between the length between the first end 104A of the first parasitic branch 104, i.e., the third grounding point and the first coupling gap F and 11.5 mm may be within a preset range. The current distribution of the low frequency band may be shown in FIG4 .

[0047] In one embodiment, please continue to refer to Figure 3, the third wavelength mode generated by the main radiator 101 under the excitation of the feeding signal and the quarter-wavelength mode of the first parasitic branch 104 are used to support the antenna module 100 to work in the high frequency band. The third wavelength mode includes a quarter-wavelength mode from the feeding point D to the first coupling slot F.

[0048] Optionally, the high frequency band HB is supported through the feeding point D to the quarter wavelength mode of the first coupling slot F and the quarter wavelength mode of the first parasitic branch 104 .

[0049] Optionally, as shown in Fig. 3, the antenna module 100 further includes a second parasitic branch 105, and a second coupling gap G exists between the second parasitic branch 105 and the second end of the main radiator 101. The fourth wavelength mode generated by the main radiator 101 under the excitation of the feeding signal and the quarter-wavelength mode of the second parasitic branch 105 are used to support the antenna module 100 to operate in the high frequency band.

[0050] The fourth wavelength mode includes a quarter wavelength mode from the feeding point D to the first coupling slot F. The second parasitic branch 105 is coupled to the main radiator 101 through the second coupling slot G to generate a coupling current to support the high frequency band. As shown in FIG3 , the second parasitic branch 105 includes a fourth grounding point, and the difference between the length of the fourth grounding point and the second coupling slot G and 13 mm can be within a preset range.

[0051] Optionally, the high frequency band HB is supported through the feeding point D to the quarter wavelength mode of the first coupling slot F and the quarter wavelength mode of the second parasitic branch 105. The current distribution in the high frequency band may be as shown in FIG5.

[0052] In an embodiment of the present application, as shown in Figure 6, the main radiator 101 is connected to the first matching circuit 103 through the first grounding point C. The first matching circuit 103 includes multiple matching branches and a selection switch 1031. The multiple matching branches include a first matching branch 1032 and a second matching branch 1033. The first matching branch 1032 is used to tune the intermediate frequency band when the selection switch 1031 turns on the first matching branch 1032. The second matching branch 1033 is used to tune the low frequency band when the selection switch 1031 turns on the second matching branch 1033.

[0053] Among them, the enabling switch 1031 can be a single-pole multi-throw switch, and the first matching branch 1032 can be used to ground the main radiator 101 through the first matching branch 1032 when the enabling switch 1031 is turned on. The first matching branch 1032 can be tuned to support intermediate frequency bands B1 and B3, etc.

[0054] Optionally, as shown in Figure 6, the first matching branch 1032 includes a first branch 61 and a second branch 62; the first end of the first branch 61 is connected to the selection switch 1031, the second end of the first branch 61 is grounded, and the first branch 61 includes a first capacitor C1; the first end of the second branch 62 is connected to the selection switch 1031, the second end of the second branch 62 is grounded, and the second branch 62 includes a second capacitor C2.

[0055] The first capacitor C1 may be 0.3 pF, and the second capacitor C2 may be 4.3 pF. The selection switch 1031 is automatically switched to match different frequency bands.

[0056] Optionally, please continue to refer to Figure 6, the second matching branch 1033 includes a third branch 63 and a fourth branch 64; the first end of the third branch 63 is connected to the selection switch 1031, the second end of the third branch 63 is grounded, and the third branch 63 includes a first inductor L1; the first end of the fourth branch 64 is connected to the selection switch 1031, the second end of the fourth branch 64 is grounded, and the fourth branch 64 includes a second inductor L2.

[0057] The second matching branch 1033 can be used to ground the main radiator 101 through the second matching branch 1033 when the gate switch 1031 is turned on, and the second matching branch 1033 can be tuned to support low frequency bands B5, B8 and B28, etc. The first inductor L1 can be 20nH, and the second inductor L2 can be 36nH.

[0058] In an embodiment of the present application, as shown in FIG7 , the first matching circuit 103 further includes a third inductor L3 and a third capacitor C3; a first end of the third inductor L3 is connected to the selection switch 1031, and a second end of the third inductor L3 is connected to the first ground point C; a first end of the third capacitor C3 is connected to a second end of the third inductor L3, and a second end of the third capacitor C3 is grounded.

[0059] The third inductor L3 may be 1.5 nH, and the third capacitor C3 may be 0.3 pF. The third inductor L3 and the third capacitor C3 are used for clock matching so that the antenna module 100 can resonate in various working frequency bands.

[0060] In one embodiment, as shown in FIG. 8 , a second matching circuit 106 is included between the main radiator 101 and the feed source 102 ; the second matching circuit 106 includes a fourth capacitor C4 , a fourth inductor L4 , a fifth capacitor C5 , and a fifth inductor L5 .

[0061] Among them, the first end of the fourth capacitor C4 is connected to the feed source 102, the second end of the fourth capacitor C4 is grounded, the first end of the fourth inductor L4 is connected to the feed source 102, the second end of the fourth inductor L4 is connected to the fifth capacitor C5, the second end of the fifth capacitor C5 is connected to the feeding point D, the first end of the fifth inductor L5 is connected to the feeding point D, and the second end of the fifth inductor L5 is grounded.

[0062] The fourth capacitor C4 may be 0.3 pF, the fourth inductor L4 may be 2 nH, the fifth capacitor C5 may be 3.6 pF, and the fifth inductor L5 may be 6.2 nH. The second matching circuit 106 is used to adjust the resonant frequency so that the antenna module 100 can resonate in various operating frequency bands.

[0063] Optionally, please continue to refer to FIG8 , the second grounding point E is grounded through a sixth inductor L6 . The size of the sixth inductor L6 may be 1 nH, and the sixth inductor L6 is used to tune the low frequency band of the antenna module 100 .

[0064] In an embodiment of the present application, an antenna module is provided, as shown in FIG9 , which is grounded through a first grounding point C and a second grounding point E on the main radiator 101, respectively. By increasing the return point, the current mode of the antenna module is increased, and the half-wavelength mode from the second grounding point E to the first end 101A of the main radiator 101 supports operation in the intermediate frequency band, so that the current on the antenna module 100 is relatively dispersed, and the current dispersion can disperse the SAR hotspot, thereby reducing the SAR value of the antenna module and providing the user with a good signal experience. The quarter-wavelength mode from the second grounding point E to the first end 104A of the first parasitic branch 104 supports operation in the low frequency band. The quarter-wavelength mode from the feed point D to the first coupling slot F and the quarter-wavelength mode of the first parasitic branch 104 or the second parasitic branch 105 supports operation in the high frequency band.

[0065] In one embodiment, a middle frame is provided, the middle frame assembly includes the antenna module 100 as in any of the above embodiments, the middle frame assembly also includes: a substrate, including a feed source and a floor; a frame, which is arranged around the substrate, and the first parasitic branch 104, the main radiator 101 and the second parasitic branch 105 in the antenna module 100 are arranged on the frame.

[0066] The substrate may be a conductive metal, or other materials. The substrate may be provided with a feed source and a floor in an electronic device. In some embodiments, the feed source may not be provided on the substrate, but may be provided directly on the circuit board.

[0067] The frame can be made of conductive metal, so the frame can also be called a "metal frame". Of course, the frame can also be made of other materials. The middle frame assembly and the back cover can form a shell assembly. The shell assembly is not limited to the middle frame assembly and the back cover. The shell assembly can be provided with a radiator by laminating, bonding, snapping, buckling, welding, etc.

[0068] In one embodiment, the main radiator 101 is disposed at the bottom area of ​​the frame, that is, it can be processed from the frame.

[0069] In some embodiments, the frame is arranged around the substrate, and the main radiator 101 in the antenna module is arranged on the frame and can be processed by the frame.

[0070] In one embodiment, an electronic device is also provided, which includes a middle frame assembly, a display screen and a back cover as in any of the above embodiments, wherein the display screen is arranged on one side of the middle frame assembly, and the back cover is arranged on the other side of the middle frame assembly, and forms a accommodating cavity with the middle frame assembly.

[0071] The electronic device can be a cellular phone, a smart phone, other wireless communication devices, a personal digital assistant, an audio player, other media players, a music recorder, a video recorder, a camera, other media recorders, a radio, a medical device, a calculator, a programmable remote control, a pager, a netbook computer, a personal digital assistant (PDA for short), a portable multimedia player (PMP for short), a Moving Picture Experts Group (MPEG-1 or MPEG-2 for short), an audio layer 3 (MP3 for short) player, a portable medical device, a digital camera and a combination thereof.

[0072] Please refer to Figure 10, which is a schematic diagram of the structure of an electronic device 1500 in an embodiment of the present application. The electronic device 1500 may include a display screen 50 for displaying information, a middle frame assembly 60 for mounting the display screen 50 on one side, a circuit board 70 mounted on the middle frame assembly 60, a battery 80 mounted on the middle frame assembly 60, and a back cover 90 snap-fitted to the other side of the middle frame assembly 60.

[0073] The display screen 50 may be a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display, etc., for displaying information and images.

[0074] The material of the middle frame assembly 60 can be a metal such as magnesium alloy, aluminum alloy, stainless steel, etc. Of course, the material is not limited thereto, and can also be other. The middle frame assembly 60 can be placed between the display screen 50 and the back cover 90. The middle frame assembly 60 can be used to carry the display screen 50. The middle frame assembly 60 and the back cover 90 are snap-fitted to form the outer contour of the electronic device 1500, and a receiving cavity is formed inside. The receiving cavity can be used to accommodate electronic components such as a camera, a circuit board 70, a battery 80, a processor, and various types of sensors in the electronic device 1500.

[0075] The circuit main board 70 is installed in the accommodating cavity and can be installed at any position in the accommodating cavity. The processor of the electronic device 1500 can be set on the circuit main board 70. The circuit main board 70 can also integrate one, two or more functional components such as a motor, a microphone, a speaker, a receiver, an earphone interface, a universal serial bus interface (USB interface), a camera, a distance sensor, an ambient light sensor, a gyroscope, etc. At the same time, the display screen 50 can be electrically connected to the circuit main board 70.

[0076] The battery 80 is installed in the accommodating cavity and can be installed at any position in the accommodating cavity. The battery 80 can be electrically connected to the circuit main board 70 so that the battery 80 can power the electronic device 1500. A power management circuit can be provided on the circuit main board 70. The power management circuit is used to distribute the voltage provided by the battery 80 to various electronic components in the electronic device 1500, such as the display screen 50.

[0077] The back cover 90 can be made of the same material as the middle frame assembly 60, or other materials. The back cover 90 can be integrally formed with the middle frame assembly 60. In some embodiments, the back cover 90 can wrap the middle frame assembly 60 and can carry the display screen 50. The back cover 90 can be formed with a rear camera hole, a fingerprint recognition module installation hole, and other structures.

[0078] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0079] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An antenna module, It is characterized in that The antenna module comprises a main radiator, wherein the first end and the second end of the main radiator are both free ends, and the main radiator comprises a first grounding point, a feeding point, and a second grounding point; the feeding point is connected to a feed source, the feeding point is arranged between the first grounding point and the second grounding point, a first matching circuit is arranged between the first grounding point and the ground line, the first grounding point is close to the first end of the main radiator, and the second grounding point is close to the second end of the main radiator; The first wavelength mode generated by the main radiator under the excitation of the feeding signal output by the feed source is used to support the antenna module to operate in the intermediate frequency band, wherein the first wavelength mode includes a half wavelength mode from the second ground point to the first end of the main radiator.

2. The antenna module according to claim 1, It is characterized in that The antenna module further includes a first parasitic branch, and a first coupling gap exists between the first parasitic branch and the first end of the main radiator; The second wavelength mode generated by the main radiator under the excitation of the feeding signal is used to support the antenna module to work in a low frequency band; The second wavelength mode includes a quarter wavelength mode from the second ground point to the first end of the first parasitic branch, and the first end of the first parasitic branch is an end of the first parasitic branch away from the first coupling slot.

3. The antenna module according to claim 2, It is characterized in that The third wavelength mode generated by the main radiator under the excitation of the feeding signal and the quarter-wavelength mode of the first parasitic branch are used to support the antenna module to work in a high frequency band; The third wavelength mode includes a quarter wavelength mode from the feeding point to the first coupling slot.

4. The antenna module according to claim 2, It is characterized in that The antenna module further includes a second parasitic branch, and a second coupling gap exists between the second parasitic branch and the second end of the main radiator; The fourth wavelength mode generated by the main radiator under the excitation of the feeding signal and the quarter wavelength mode of the second parasitic branch are used to support the antenna module to work in a high frequency band; The fourth wavelength mode includes a quarter wavelength mode from the feeding point to the first coupling slot.

5. The antenna module according to any one of claims 1 to 4, It is characterized in that The first matching circuit includes multiple matching branches and a gating switch, the multiple matching branches include a first matching branch and a second matching branch, the first matching branch is used to tune the intermediate frequency band when the gating switch turns on the first matching branch, and the second matching branch is used to tune the low frequency band when the gating switch turns on the second matching branch.

6. The antenna module according to claim 5, It is characterized in that The first matching branch includes a first branch and a second branch; A first end of the first branch is connected to the gate switch, a second end of the first branch is grounded, and the first branch includes a first capacitor; A first end of the second branch is connected to the gate switch, a second end of the second branch is grounded, and the second branch includes a second capacitor.

7. The antenna module according to claim 5, It is characterized in that The second matching branch includes a third branch and a fourth branch; A first end of the third branch is connected to the gate switch, a second end of the third branch is grounded, and the third branch includes a first inductor; A first end of the fourth branch is connected to the gate switch, a second end of the fourth branch is grounded, and the fourth branch includes a second inductor.

8. The antenna module according to claim 5, It is characterized in that The first matching circuit also includes a third inductor and a third capacitor; A first end of the third inductor is connected to the gate switch, and a second end of the third inductor is connected to the first ground point; A first end of the third capacitor is connected to a second end of the third inductor, and a second end of the third capacitor is grounded.

9. The antenna module according to claim 1, It is characterized in that A second matching circuit is included between the main radiator and the feed source; the second matching circuit includes a fourth capacitor, a fourth inductor, a fifth capacitor and a fifth inductor; A first end of the fourth capacitor is connected to the feed source, and a second end of the fourth capacitor is grounded; A first end of the fourth inductor is connected to the feed source, and a second end of the fourth inductor is connected to the fifth capacitor; The second end of the fifth capacitor is connected to the feeding point; A first end of the fifth inductor is connected to the feeding point, and a second end of the fifth inductor is grounded.

10. The antenna module according to claim 1, It is characterized in that The second grounding point is grounded through a sixth inductor.

11. A middle frame assembly, It is characterized in that The middle frame assembly includes the antenna module according to any one of claims 1 to 10, and the middle frame assembly further includes: substrate, including feed and floor; A frame is arranged around the substrate, and the first parasitic branch, the main radiator and the second parasitic branch in the antenna module are arranged on the frame.

12. An electronic device, It is characterized in that The electronic device comprises the middle frame assembly as claimed in claim 11.

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