Middle frame and electronic equipment

Abstract

The invention discloses a middle frame and electronic equipment, a first radiator comprises a main branch knot, a parasitic branch knot and an auxiliary branch knot, and the main branch knot comprises a first free end, a first feeding point and a first grounding point which are arranged in sequence; the parasitic branch knot comprises a second free end, the second free end and the first free end are opposite and arranged at an interval, at least part of the auxiliary branch knot is close to the inner side of the electronic equipment relative to the main branch knot, the auxiliary branch knot comprises a first connecting end and a second connecting end, the first connecting end of the auxiliary branch knot is connected with the first feeding point, and the second connecting end of the auxiliary branch knot is connected with the second feeding point. The second connecting end of the auxiliary branch knot is connected with the parasitic branch knot; the first signal source is electrically connected with the first feeding point, and the first signal source is used for exciting the first feeding point to the first free end to form a first resonant mode supporting a first frequency band and exciting the first feeding point to the second free end to form a second resonant mode supporting the first frequency band. According to the invention, the working SAR value of the antenna can be reduced, and the power back-off of the antenna assembly is reduced.

Description

Technical Field

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

[0002] As the communication requirements on electronic devices such as mobile phones increase, the number of antennas required on electronic devices also increases. The number of frequency bands supported by a single antenna is also increasing, and there are more and more multi-band joint transmission working modes. The electromagnetic wave absorption rate (Specific Absorption Rate, SAR) during multi-band joint transmission is also getting higher and higher, and a certain amount of power needs to be backed off, resulting in a decrease in the power of the antenna component. Therefore, how to reduce the SAR value of the antenna operation and reduce the power backoff of the antenna component has become a technical problem that needs to be solved. Summary of the invention

[0003] The present application provides a middle frame and electronic device that can reduce the SAR value of an antenna and reduce the power backoff of an antenna component.

[0004] In a first aspect, an embodiment of the present application provides an electronic device, including an antenna assembly, wherein the antenna assembly includes:

[0005] A first radiator includes a main branch, a parasitic branch and an auxiliary branch, wherein the main branch includes a first free end, a first feeding point and a first grounding point which are arranged in sequence; the parasitic branch includes a second free end which is opposite to and spaced from the first free end, at least a portion of the auxiliary branch is close to the inner side of the electronic device relative to the main branch, the auxiliary branch includes a first connecting end and a second connecting end, the first connecting end of the auxiliary branch is connected to the first feeding point, and the second connecting end of the auxiliary branch is connected to the parasitic branch; and

[0006] A first signal source, the first signal source is electrically connected to the first feeding point, and the first signal source is used to excite the first feeding point to the first free end to form a first resonant mode supporting a first frequency band, and to excite the first feeding point to the second free end to form a second resonant mode supporting the first frequency band.

[0007] In a second aspect, an embodiment of the present application provides a middle frame, wherein the middle frame includes:

[0008] A frame portion, the frame portion comprising a main branch and a parasitic branch arranged at intervals, the main branch forming a main branch, the main branch comprising a first free end, a first feeding point and a first grounding point arranged in sequence, the parasitic branch comprising a second free end, the second free end being opposite to the first free end and arranged at intervals; and

[0009] A conductive portion, wherein the conductive portion is arranged inside the frame portion and is integrally formed with the frame portion, the conductive portion includes an auxiliary branch node, a first connection end of the auxiliary branch node is electrically connected to the first feeding point, a second connection end of the auxiliary branch node extends toward a side away from the first grounding point and is connected to the parasitic branch node, and the first feeding point is used to feed an excitation signal to excite the first feeding point to the first free end to form a first resonant mode supporting a first frequency band, and to excite the first feeding point to the second free end to form a second resonant mode supporting the first frequency band.

[0010] In a third aspect, an embodiment of the present application provides an electronic device, including a signal source, a reference floor and the middle frame, wherein the signal source is electrically connected to the first feeding point, and the reference floor is electrically connected to the first grounding point.

[0011] The present application designs a first radiator of an antenna assembly including a main branch, a parasitic branch and an auxiliary branch. The main branch includes a first free end, a first feeding point and a first grounding point which are arranged in sequence. The parasitic branch includes a second free end which is opposite to and spaced from the first free end. At least a portion of the auxiliary branch is close to the inner side of the electronic device relative to the main branch. The auxiliary branch includes a first connecting end and a second connecting end. The first connecting end of the auxiliary branch is connected to the first feeding point, and the second connecting end of the auxiliary branch is connected to the parasitic branch. A first signal source is electrically connected to the first feeding point. The first signal source is used to excite the first feeding point to the first free end to form a first resonant mode supporting the first frequency band, and to excite the first feeding point to the second free end to form a second resonant mode supporting the first frequency band. The setting of the auxiliary branch increases the resonant mode of the first frequency band, increases the bandwidth of the first frequency band, and disperses the current intensity on the main branch. The auxiliary branch is farther away from the human body than the main branch, that is, part of the current on the main branch is set at a position farther away from the human body, thereby reducing the SAR value of the antenna operation, reducing the human body's absorption of electromagnetic radiation, and reducing the power back-off of the antenna assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

[0013] Figure 1 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0014] Figure 2 It is a partial exploded schematic diagram of an electronic device provided in an embodiment of the present application;

[0015] Figure 3 is a partial top view of an electronic device provided by an embodiment of the present application;

[0016] Figure 4This is a schematic diagram of the structure of the first antenna assembly provided in the embodiment of the present application. Figure 1 ;

[0017] Figure 5 yes Figure 4 A schematic diagram of S-parameter curves of a first resonant mode and a second resonant mode generated by an antenna assembly is provided;

[0018] Figure 6 yes Figure 4 A schematic diagram of current distribution of a first resonant mode of an antenna assembly is provided;

[0019] Figure 7 yes Figure 4 A schematic diagram of current distribution of a second resonant mode of an antenna assembly is provided;

[0020] Figure 8 It is a schematic diagram of the structure of an antenna assembly provided by an embodiment of the present application without parasitic branches;

[0021] Fig. 9 This is a schematic diagram of the structure of the antenna assembly provided in the embodiment of the present application. Figure 2 ;

[0022] Fig.10 yes Fig. 9 A schematic diagram of current distribution of a third resonant mode of an antenna assembly is provided;

[0023] Fig.11 yes Fig. 9 A schematic diagram of current distribution of a fourth resonance mode of an antenna assembly is provided;

[0024] Fig.12 is a structural schematic diagram of a second antenna assembly provided in an embodiment of the present application;

[0025] Fig.13 yes Fig.12 A schematic diagram of current distribution of the fifth resonance mode on the second antenna assembly provided;

[0026] Fig.14 is a structural schematic diagram of a third antenna assembly provided in an embodiment of the present application;

[0027] Fig.15 is a schematic diagram of the current distribution of the third antenna assembly and the sixth resonant mode provided in an embodiment of the present application;

[0028] Fig.16 is a schematic diagram of the current distribution of the third antenna assembly and the seventh resonance mode provided in an embodiment of the present application;

[0029] Fig.17 is a structural schematic diagram of a first type of first branch segment in an antenna assembly on a middle frame provided in an embodiment of the present application;

[0030] Fig.18 is a schematic structural diagram of a second type of first branch segment in an antenna assembly on a middle frame provided in an embodiment of the present application;

[0031] Fig.19 is a structural schematic diagram of a third type of first branch segment in an antenna assembly on a middle frame provided in an embodiment of the present application;

[0032] Fig. 20 It is a schematic diagram of the structure of the antenna assembly provided in an embodiment of the present application on the middle frame;

[0033] Fig.21 is a flow chart of a middle frame forming method provided in an embodiment of the present application;

[0034] Fig. 22 is a schematic diagram of a middle frame structure provided in an embodiment of the present application;

[0035] Fig.23 is an S parameter and efficiency curve diagram of an antenna without the first branch segment and the second branch segment;

[0036] Fig.24 is a schematic diagram of SAR hotspot distribution at 3.55 GHz for an antenna without the first branch segment and the second branch segment;

[0037] Fig.25 yes Fig.14 Provide S-parameters and efficiency curves of antenna components;

[0038] Fig.26 yes Fig.14 Schematic diagram of SAR hotspot distribution of the provided antenna assembly at 3.55GHz;

[0039] Fig. 27 is a resonant current distribution diagram of an antenna without the first branch segment and the second branch segment in the N78 frequency band;

[0040] Fig.28 This is a resonant current distribution diagram of the antenna assembly provided in an embodiment of the present application in the N78 frequency band.

[0041] Description of Figure Numbers:

[0042] Electronic device 1000; antenna assembly 100; display screen 200; middle frame 300; back cover 400; middle plate 310; frame 320; top edge 321; bottom edge 322; first side edge 323; second side edge 324; first radiator 10; first signal source 20; main branch 11; auxiliary branch 23; first feeding point B; first grounding point A; first connecting end 23a; second connecting end 23b; first free end C; first branch segment 231; second branch segment 232; matching circuit M; parasitic branch 41; third free end D; parasitic branch 41; fourth branch segment 234; second grounding point E; third radiator 30; second signal source 40; third grounding point H; second feeding point G; fourth free end F; conductive portion 311; first gap 10a; second gap 10b; first slot 20a; second slot 20b. DETAILED DESCRIPTION

[0043] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0044] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0046] See also Figure 1 , Figure 1The following is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. The electronic device 1000 includes, but is not limited to, a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, a robot, a digital camera, and other devices with communication functions. The present embodiment of the present application is described using a mobile phone as an example, and other electronic devices 1000 may refer to this embodiment.

[0047] With the widespread use of metal frame antennas and the increase in the number of communication frequency bands, the number of frequency bands supported by a single antenna in a metal frame antenna has also increased, and there are more and more multi-band joint transmission working modes. The electromagnetic wave absorption ratio during multi-band joint transmission is much higher than that during single-band transmission, and more power needs to be backed off when the SAR standard value is reached. For example, the antenna in the upper left corner of the frame (back view) includes a dual-band antenna that supports Wi-Fi 2.4G+Wi-Fi5G and a dual-band antenna for GPSL1+N78, or a dual-band antenna that supports Wi-Fi 2.4G+MHB and a tri-band antenna for Wi-Fi 5G+L1+N78 to ensure the performance of Wi-Fi, GPS, and 5G signals. The above dual-band or tri-band bands are joint transmission bands.

[0048] With the release of the new SAR standard, the SAR values ​​of antennas in single-transmitter and joint-transmitter bands are controlled. The SAR value of antennas in single-transmitter bands does not exceed 1.5W / kg, and the SAR value of antennas in joint-transmitter bands does not exceed 1.8W / kg. Generally, in the case of single-transmitter in the N78 band, at an uplink duty cycle of 32.8% in the actual network, based on the actual SAR value of the N78 antenna, the N78 antenna basically does not need to back off power, and the antenna performance can be maintained; while the SAR values ​​of the joint-transmitter antennas in the N78 band and the Wi-Fi band will be added, resulting in an over-standard SAR value. Therefore, the problem of over-standard backoff of the SAR value of the N78 joint-transmitter antenna needs to be solved.

[0049] See also Figure 2 , the electronic device 1000 includes an antenna assembly 100. The antenna assembly 100 can improve antenna efficiency.

[0050] See also Figure 2, taking the electronic device 1000 as a mobile phone as an example, the working environment of the antenna assembly 100 is illustrated. The electronic device 1000 includes a display screen 200, a middle frame 300 and a back cover 400 arranged in sequence along the thickness direction. Among them, the middle frame 300 includes a middle plate 310 and a frame 320 surrounding the side of the middle plate 310. The frame 320 may be a conductive frame. Of course, in other embodiments, the electronic device 1000 may not have a middle plate 310. The display screen 200, the middle plate 310 and the back cover 400 are stacked in sequence, and a receiving space is formed between the display screen 200 and the middle plate 310, and between the middle plate 310 and the back cover 400 to accommodate components such as a main board, a camera module, a receiver module, a battery, and various sensors. One side of the frame 320 is surrounded by the edge of the display screen 200, and the other side of the frame 320 is surrounded by the edge of the back cover 400 to form a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, and the frame 320 and the back cover 400 may be separate structures. The above is the working environment of the antenna assembly 100 taking a mobile phone as an example, but the antenna assembly 100 of the present application is not limited to the above working environment.

[0051] See also Figure 3 The frame 320 includes a top edge 321 and a bottom edge 322 that are arranged opposite to each other, and a first side edge 323 and a second side edge 324 that are connected to the top edge 321 and the bottom edge 322. The top edge 321 is the side away from the ground when the user holds the electronic device 1000, and the bottom edge 322 is the side facing the ground when the user holds the electronic device 1000. The first side edge 323 is the left side when the user holds the electronic device 1000. The second side edge 324 is the right side when the user holds the electronic device 1000.

[0052] See also Figure 4 The antenna assembly 100 includes a first radiator 10 and a first signal source 20 electrically connected to the first radiator 10 .

[0053] See also Figure 4 The first radiator 10 includes a main branch 11, a parasitic branch 41 and an auxiliary branch 23, and the main branch 11 and the auxiliary branch 23 are connected.

[0054] The first radiator 10 is a port for the antenna assembly 100 to send and receive radio frequency signals. The radio frequency signal is transmitted in the air medium in the form of an electromagnetic wave signal. The present application does not specifically limit the material of the first radiator 10. Optionally, the material of the first radiator 10 is a conductive material, including but not limited to conductive materials such as metals and alloys.

[0055] The present application does not specifically limit the shape of the first radiator 10. For example, the shape of the first radiator 10 includes but is not limited to a strip, a sheet, a rod, a coating, a film, and the like. Figure 4 The first radiator 10 shown is only an example and does not limit the shape of the first radiator 10 provided in the present application. In the present embodiment, the first radiators 10 are all in a strip shape. The present application does not limit the extension trajectory of the first radiator 10. Optionally, the first radiator 10 may extend along a curve or along a bending line. In the present embodiment, the first radiator 10 is in a bent shape. The above-mentioned first radiator 10 may be a line with uniform width on the extension trajectory, or may be a strip with unequal width such as a gradient width and a widened area.

[0056] The present application does not specifically limit the form of the first radiator 10. Optionally, the form of the first radiator 10 includes but is not limited to a metal frame, a metal frame embedded in a plastic frame, a metal first radiator 10 located in or on the frame 320, a flexible printed circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct structured antenna by laser direct structure (LDS), a printed direct structured antenna by printing direct structure (PDS), a conductive sheet antenna (such as a metal bracket antenna), etc.

[0057] See also Figure 4 , the main branch 11 includes a first free end C, a first feeding point B and a first grounding point A which are arranged in sequence. The first grounding point A is electrically connected to the reference ground, and the electrical connection method includes but is not limited to interconnection as a whole by physical contact, or indirect methods such as coaxial lines, microstrip lines, conductive springs, conductive adhesives, etc. Among them, the first free end C is the end disconnected from other conductive structures. Of course, insulating material can be filled between the first free end C and the other conductive structures to ensure the firmness of the connection between the main branch 11 and the other conductive structures.

[0058] The parasitic branch 41 includes a second free end 411. The second free end 411 is opposite to and spaced from the first free end C. The end of the parasitic branch 41 away from the second free end 411 is a free end or a ground end, which will be described in detail later.

[0059] At least part of the auxiliary branch node 23 is close to the inner side of the electronic device 1000 relative to the main branch node 11. The frame 320 is a conductive frame. The main branch node 11 is a part of the frame 320, and the auxiliary branch node 23 is a conductor located on the inner side of the frame 320. The present application does not specifically describe the extension direction of the auxiliary branch node 23. Optionally, the extension direction of the auxiliary branch node 23 is relative to and parallel to the extension direction of the main branch node 11. Optionally again, the extension direction of the auxiliary branch node 23 intersects with the extension direction of the main branch node 11.

[0060] See also Figure 4 The two ends of the auxiliary branch node 23 are respectively a first connection end 23a and a second connection end 23b. The first connection end 23a of the auxiliary branch node 23 is connected to the first feeding point B. The second connection end 23b of the auxiliary branch node 23 extends in a direction away from the first feeding point B and is connected to the parasitic branch node 41. Optionally, the second connection end 23b of the auxiliary branch node 23 is connected to the middle of the parasitic branch node 41, or to the second free end 411 of the parasitic branch node 41, or to an end of the parasitic branch node 41 away from the second free end 411.

[0061] The first signal source 20 is electrically connected to the first feeding point B.

[0062] The first signal source 20 includes but is not limited to a radio frequency transceiver chip, etc. The first signal source 20 is used to transmit a radio frequency signal (radio frequency current). After the radio frequency signal is transmitted to the first radiator 10, it can excite part or all of the first radiator 10 to generate a resonant current to form a resonant mode to support the frequency band corresponding to the resonant current.

[0063] In the embodiment of the present application, the first signal source 20 is disposed on the mainboard. The electrical connection method between the first signal source 20 and the first radiator 10 includes but is not limited to direct welding, or indirect connection through coaxial lines, microstrip lines, conductive springs, conductive adhesives, etc. Specifically, the first signal source 20 is electrically connected to the first feeding point B through a feeding spring (conductive spring) disposed on the mainboard.

[0064] See also Figure 5, the first signal source 20 is used to excite the first feeding point B to the first free end C to form a first resonance mode supporting the first frequency band, and at the same time, the first signal source 20 also excites the first feeding point B to the second connection end 23b to form a second resonance mode supporting the first frequency band. In other words, under the excitation signal provided by the signal source, the first radiator 10 simultaneously generates a first resonance current between the first feeding point B and the first free end C, and a second resonance current between the first feeding point B and the second connection end 23b. When the return loss corresponding to the first resonance mode is -10dB (-10dB is an example value, and can also be -5dB, -6dB, -7dB, -8dB, etc.), the corresponding frequency band covers the first frequency band. When the return loss corresponding to the second resonance mode is -10dB (-10dB is an example value, and can also be -5dB, -6dB, -7dB, -8dB, etc.), the corresponding frequency band covers the first frequency band. In other words, the antenna assembly 100 can generate dual-wave resonance covering the first frequency band, improve the efficiency of the first frequency band and increase the working bandwidth of the first frequency band. The present application does not limit the first frequency band, and optionally, at least one of the LB band (less than 1 GHz), the MHB band (1-3 GHz), the UHB band (greater than 3 GHz), the Wi-Fi band, the GPS band, etc.

[0065] The present application designs a first radiator 10 of an antenna assembly 100 including a main branch 11, a parasitic branch 41 and an auxiliary branch 23. The main branch 11 includes a first free end C, a first feeding point B and a first grounding point A which are arranged in sequence. The parasitic branch 41 includes a second free end 411, and the second free end 411 is opposite to and spaced from the first free end C. At least a portion of the auxiliary branch 23 is close to the inner side of the electronic device 1000 relative to the main branch 11. The auxiliary branch 23 includes a first connecting end 23a and a second connecting end 23b. The first connecting end 23a of the auxiliary branch 23 is connected to the first feeding point B, and the second connecting end 23b of the auxiliary branch 23 extends in a direction away from the first feeding point B and connects to the first grounding point A. The parasitic branch 41, the first signal source 20 is electrically connected to the first feeding point B, the first signal source 20 is used to excite the first feeding point B to the first free end C to form a first resonant mode supporting the first frequency band, and excite the first feeding point B to the second connection end 23b to form a second resonant mode supporting the first frequency band. The setting of the auxiliary branch 23 increases the resonant mode of the first frequency band, increases the bandwidth of the first frequency band, and disperses the current intensity on the main branch 11. The auxiliary branch 23 is farther away from the human body than the main branch 11, that is, part of the current on the main branch 11 is set at a position farther away from the human body, thereby reducing the SAR value of the antenna operation, reducing the human body's absorption of electromagnetic radiation, and reducing the power back-off of the antenna assembly 100.

[0066] For further information, see Figure 6, the electrical length between the first feeding point B and the first free end C on the main branch 11 is close to or equal to 1 / 4 wavelength of the first frequency band, and the first resonant mode is the 1 / 4 wavelength mode of the first frequency band. Since the resonant current of the first resonant mode is mainly distributed from the first feeding point B to the first free end C, the first resonant mode is a monopole mode (resonant current mode of a monopole antenna). The 1 / 4 wavelength mode is the ground state mode of the monopole mode, and the ground state mode supporting the first frequency band is formed on the exciting main branch 11, so that the first frequency band has better efficiency.

[0067] For further information, see Figure 7 , the electrical length between the first feeding point B and the second free end 411 is 1 / 4 wavelength of the first frequency band, and the second resonance mode is the 1 / 4 wavelength mode of the first frequency band. Since the resonant current of the second resonance mode is mainly distributed from the first feeding point B to the second free end 411, the second resonance mode is a monopole mode (resonant current mode of a monopole antenna). The 1 / 4 wavelength mode is the ground state mode of the monopole mode, and the ground state mode supporting the first frequency band is formed on the exciting auxiliary branch 23, so that the first frequency band has better efficiency. When the first feeding point B is connected to the signal source 20 through the connecting protrusion 325, the resonant current of the first resonance mode is mainly distributed from the connecting protrusion 325 to the second free end 411.

[0068] When the antenna assembly 100 operates in the first frequency band, the first resonant mode and the second resonant mode are generated simultaneously, a part of the resonant current is distributed between the first feed point B and the first free end C, and the other part of the resonant current is distributed between the first feed point B and the first connection end 23a. The resonant current of the antenna assembly 100 without the auxiliary branch 23 when operating in the first frequency band is distributed between the first feed point B and the first free end C. Compared with the antenna assembly 100 without the auxiliary branch 23, the antenna assembly 100 provided in the present application changes the distribution of the resonant current when operating in the first frequency band. By setting the auxiliary branch 23 that can generate the resonant mode of the first frequency band, a part of the resonant current when operating in the first frequency band is pulled down to the inner side of the frame 320, which is farther away from the human body, and the resonant current intensity on the main branch 11 is dispersed to the auxiliary branch 23. In this way, the SAR value at a certain distance (for example, 5 cm) outside the frame 320 is reduced because the resonant current intensity on the main branch 11 is dispersed.

[0069] It should be noted that the technicians of the present application have found that not any conductive structure set inside the main branch 11 can pull down the resonant current of the first frequency band, but the conductive structure that is pulled down must be able to generate a resonant mode in the first frequency band to pull down the resonant current of the first frequency band.

[0070] The above embodiments of the present application are based on the main branch 11 and the first signal source 20 forming a monopole mode supporting the first frequency band, and the auxiliary branch 23 and the first signal source 20 forming a monopole mode supporting the first frequency band. In other embodiments, the main branch 11 can also form an inverted F mode supporting the first frequency band with the first signal source 20; the auxiliary branch 23 can also form an inverted F mode supporting the first frequency band with the first signal source 20. Specifically, a first resonance mode supporting the first frequency band is formed between the first grounding point A and the first free end C, and a second resonance mode supporting the first frequency band is formed between the second connection end 23b of the auxiliary branch 23 and the first grounding point A, which can also achieve a reduced SAR value for the first frequency band.

[0071] In other implementations, the main branch 11 may also be a T-shaped antenna, a monopole antenna, etc.

[0072] In other embodiments, see Figure 8 , the first radiator may not be provided with a parasitic branch node 41, wherein the second connection end 23b of the auxiliary branch node 23 is a free end. The electrical length of the auxiliary branch node 23 is designed to be close to 1 / 4 wavelength of the first frequency band. There is no specific limitation on the extension direction of the auxiliary branch node 23. Optionally, the auxiliary branch node 23 extends from the first feeding point B toward the first grounding point A; or, the auxiliary branch node 23 extends from the first feeding point B toward the direction where the first free end C is located; or, the auxiliary branch node 23 extends from the first feeding point B in a direction perpendicular to the main branch node 11.

[0073] Optionally, the main branch 11 is a part of the frame 320, and the frame 320 is a conductive frame. A connecting protrusion 325 is provided at a position corresponding to the first feeding point B inside the frame 320, and the connecting protrusion 325 can be used to electrically connect the first signal source 20 and the first connecting end 23a of the auxiliary branch 23.

[0074] In one embodiment, the first free end C on the main branch node 11 and the first grounding point A are also used to form a resonant current supporting other frequency bands. Thus, this embodiment designs the auxiliary branch node 23 to extend from the connecting protrusion 325 in the direction toward the first free end C to reduce the influence between the resonant current on the auxiliary branch node 23 and the resonant current between the first feeding point B to the first grounding point A.

[0075] Also, see Figure 8 The auxiliary branch node 23 extends along the connecting protrusion 325 in the direction toward the first free end C, which can prevent the auxiliary branch node 23 from extending to the circuit board inside the frame, reduce the position interference of the auxiliary branch node 23 on the electronic components on the circuit board, and avoid the influence of the metal on the circuit board on the auxiliary branch node 23 receiving and transmitting signals, thereby increasing the antenna clearance.

[0076] For further information, see Figure 6 and Figure 7, the direction of the resonant current of the first resonant mode is the same as the direction of the resonant current of the second resonant mode. That is, the first resonant current flows from the first feeding point B to the first free end C, and the second resonant current flows from the first feeding point B to the second free end 411. Alternatively, the first resonant current flows from the first free end C to the first feeding point B, and the second resonant current flows from the second free end 411 to the first feeding point B. In this way, the first resonant current on the main branch node 11 and the second resonant current on the auxiliary branch node 23 overlap in position and have the same direction in the direction from the inside to the outside of the frame 320 (electromagnetic waves radiate toward the outside of the frame 320), effectively avoiding the energy cancellation caused by the reverse resonant current when the electromagnetic waves radiate toward the outside of the frame 320, and then the first resonant current and the second resonant current in the same direction are superimposed on each other when radiating toward the outside of the frame 320, thereby improving the radiation efficiency.

[0077] For details, please refer to Figure 8 and Fig. 9 , the auxiliary branch 23 includes a first branch segment 231. The extension direction of the first branch segment 231 is consistent with the extension direction of the main branch 11. Furthermore, the first branch segment 231 is parallel to and opposite to the main branch 11. The first branch segment 231 is closer to the inner side of the electronic device 1000 relative to the main branch 11. With reference to the inside and outside of the electronic device 1000, the first branch segment 231 is located on the inner side of the main branch 11, and the first branch segment 231 is further away from the human body. One end of the first branch segment 231 is electrically connected to the first feeding point B. The first branch segment 231 extends toward the side away from the first grounding point A.

[0078] In one embodiment, see Figure 8 The auxiliary branch 23 is the first branch segment 231, that is, the entire auxiliary branch 23 is parallel to the main branch 11, that is, the second resonant current on the entire auxiliary branch 23 is arranged on the inner side of the main branch 11, away from the human body, thereby reducing the SAR value.

[0079] In another embodiment, see Fig. 9 , the first branch segment 231 is a part of the auxiliary branch segment 23. The auxiliary branch segment 23 is a bent branch segment. The auxiliary branch segment 23 also includes a second branch segment 232. The second branch segment 232 intersects with the first branch segment 231. One end of the second branch segment 232 is connected to an end of the first branch segment 231 away from the first feeding point B, and the other end of the second branch segment 232 extends toward the parasitic branch segment 41 and connects to the parasitic branch segment 41. Specifically, the first branch segment 231 is a transverse branch segment, and the second branch segment 232 is a longitudinal branch segment or an inclined branch segment extending toward the outer direction of the frame 320.

[0080] In this embodiment, the first free end C of the main branch 11 and the first feeding point B, the first branch segment 231 and the second branch segment 232 of the auxiliary branch 23, and the parasitic branch 41 are connected to form a ring structure, so that the first signal source 20 can excite a ring mode, loop mode, on the above-mentioned ring structure.

[0081] Optional, see Figure 4 and Fig. 9 , the antenna assembly 100 also includes a matching circuit M. The matching circuit M is electrically connected between the first feeding point B and the first signal source 20. The matching circuit M adjusts the impedance matching between the port of the first signal source 20 and the port of the first radiator 10. The matching circuit M includes at least one of a capacitor and an inductor. The matching circuit M is used to make the electrical length between the first feeding point B and the first free end C close to or equal to 1 / 4 wavelength of the second frequency band, so that a third resonance mode supporting the second frequency band is formed between the first feeding point B and the first free end C, and the third resonance mode is a 1 / 4 wavelength mode. At the same time, the electrical length between the first free end C and the second free end 411 is close to or equal to 1 / 2 wavelength mode of the second frequency band, and the first free end C to the second free end 411 is roughly annular, so the first signal source 20 can also excite the first free end C to form a fourth resonance mode supporting the second frequency band between the second free end 411, which is also an annular mode and a 1 / 2 wavelength mode.

[0082] Optionally, the second frequency band is different from the first frequency band. Taking the first frequency band as the N78 frequency band as an example, the second frequency band may be the Wi-Fi 5G frequency band.

[0083] Through the above design, the antenna assembly 100 can simultaneously support multiple frequency bands, such as the N78 band and the Wi-Fi 5G band; the auxiliary branch node 23 can form a dual-wave resonance together with the main branch node 11. While the auxiliary branch node 23 disperses the distribution of the resonant current of the N78 band to reduce the SAR value, it can also form a ring antenna with a part of the main branch node 11 to support the dual-wave resonance of the Wi-Fi 5G band.

[0084] See also Fig. 9 The parasitic branch 41 further includes a third free end D, and the third free end D is arranged opposite to the second free end 411.

[0085] The parasitic branch 41 is a part of the frame 320 and is disposed adjacent to the main branch 11 .

[0086] In this embodiment, a part of the frame 320 is used as a parasitic branch 41, so that the connection strength between the auxiliary branch 23 and the main branch 11 can be increased; in addition, from the perspective of the molding method, the auxiliary branch 23 and the main branch 11 can be molded on the frame 320 by cutting or other methods.

[0087] For details, please refer to Fig.10 and Fig.11 The first signal source 20 is also used to excite the first feeding point B to the first free end C to form a third resonance mode supporting the second frequency band, and to excite the first free end C to the second free end 411 to form a fourth resonance mode supporting the second frequency band.

[0088] In this embodiment, the main current of the resonant current of the second resonant mode is distributed on the first branch segment 231. In other words, the strong current point of the resonant current of the second resonant mode is distributed on the first branch segment 231, while the weak current point is on the parasitic branch 41. Since the main second resonant current is distributed on the first branch segment 231 and the second branch segment 232 on the auxiliary branch 23, the main current part of the second resonant current is still far away from the human body, so even if the parasitic branch 41 is set on the frame 320, the auxiliary branch 23 still has the function of dispersing the current on the main branch 11, thereby reducing the SAR value in the first frequency band.

[0089] In addition, since the resonant current of the fourth resonant mode in the second frequency band is also distributed in the first branch segment 231 and the second branch segment 232 of the auxiliary branch segment 23 , the auxiliary branch segment 23 can also reduce the SAR value in the second frequency band.

[0090] In one embodiment, see Fig.12 The parasitic branch 41 further includes a second grounding point E, the second grounding point E is arranged opposite to the second free end 411, and the first free end 411 and the second free end E are coupled via a gap.

[0091] See also Fig.12 , the second connection end 23b to the second grounding point E is a fourth branch segment 234. The end of the fourth branch segment 234 away from the second free end 411 is a second grounding point E. The second grounding point E is grounded. The first free end C is coupled to the second free end 411 via a gap.

[0092] The first free end C, the first feeding point B, the first branch segment 231 , the second branch segment 232 , and the parasitic branch 41 form a ring structure.

[0093] Optional, see Fig.13 , the electrical length between the second free end 411 and the second grounding point E is close to or equal to the 1 / 4 wavelength mode of the second frequency band. The first signal source 20 is also used to excite the formation of a fifth resonance mode supporting the second frequency band between the second free end 411 and the second grounding point E. The second frequency band includes at least one of a Wi-Fi frequency band, an LTE frequency band, and an NR frequency band.

[0094] In this embodiment, by designing the electrical length of each part of the antenna component 100, it is achieved that the antenna component 100 can generate a third resonance mode, a fourth resonance mode, and a fifth resonance mode supporting the second frequency band. The third resonance mode is a 1 / 4 wavelength mode supporting the second frequency band. The fourth resonance mode is a loop mode supporting the second frequency band. The fifth resonance mode is a 1 / 4 wavelength mode supporting the second frequency band. In this way, the antenna component 100 designed in the present application can not only generate a dual-wave resonance in the first frequency band, but also generate a triple-wave resonance supporting the second frequency band. In this way, the radiation efficiency of the first and second frequency bands can be improved, the working bandwidth of the first and second frequency bands can be increased, and the frequency deviation can be reduced.

[0095] The electrical length between the first grounding point A and the first free end C is close to 1 / 4 wavelength of the GPS-L1 frequency band or the GPS-L5 frequency band. The first signal source 20 is also used to excite the first grounding point A to the first free end C to form an eighth resonance mode supporting the fifth frequency band. The fifth frequency band includes the GPS frequency band. The eighth resonance mode is a 1 / 4 wavelength mode of the fifth frequency band. In this way, the antenna assembly 100 can not only generate dual-wave resonance in the first frequency band, but also generate triple-wave resonance supporting the second frequency band, and can also support the fifth frequency band. For example, the antenna assembly 100 can support the N78+Wi-Fi+GPS frequency band.

[0096] See also Fig.14 The antenna assembly 100 further includes a third radiator 30 and a second signal source 40. The third radiator 30 includes a third ground point H, a second feeding point G and a fourth free end F which are arranged in sequence. The fourth free end F is spaced apart from the first free end C. The second signal source 40 is electrically connected to the second feeding point G.

[0097] The third radiator 30 may be located on a side of the parasitic branch 41 away from the main branch 11 .

[0098] See also Fig.15 , the electrical length between the second feeding point G and the fourth free end F is close to or equal to 1 / 4 wavelength of the fourth frequency band. The second signal source 40 is used to excite the sixth resonance mode supporting the third frequency band between the second feeding point G and the fourth free end F. The sixth resonance mode is a 1 / 4 wavelength mode of the third frequency band. Optionally, the third frequency band includes the Wi-Fi 2.4G frequency band.

[0099] Also, see Fig.16, the electrical length between the third ground point H and the fourth free end F is close to or equal to 1 / 4 wavelength of the fourth frequency band. The second signal source 40 is also used to excite the seventh resonance mode supporting the fourth frequency band between the third ground point H and the fourth free end F. The seventh resonance mode is a 1 / 4 wavelength mode of the fifth frequency band. Optionally, the fourth frequency band includes the MHB frequency band.

[0100] In this way, the antenna assembly 100 can simultaneously support N78+Wi-Fi 5G+GPS+Wi-Fi 2.4G+MHB bands. Among them, the antenna supporting the MHB band can switch the electrical length of the radiator through the switch switching circuit to switch the sub-bands in the MHB band to achieve full coverage of the MHB band, so that the antenna assembly 100 can support more bands while occupying a small space, and can also reduce the single-shot SAR value and joint SAR value of some working bands.

[0101] Optionally, the third radiator 30 may be a part of the conductive portion, for example, the third radiator 30 is a part of the conductive segment of the frame 320 .

[0102] The present application does not make any specific limitation on the main branch nodes 11 and the auxiliary branch nodes 23 , and the specific structures of the main branch nodes 11 and the auxiliary branch nodes 23 are illustrated below.

[0103] See also Fig.17 , the middle frame 300 includes a frame 320, a conductive part 311 and a plastic part (located below the reference floor 600). The conductive part 311 and the plastic part are the aforementioned middle plate 310. The conductive part 311 and the frame 320 are interconnected as a whole and the conductive part 311 is arranged inside the frame 320. The size of the conductive part 311 in the thickness direction of the electronic device 1000 is smaller than the size of the frame 320 in the thickness direction of the electronic device 1000. The conductive part 311 is a conductive sheet to form a supporting structure or a connecting structure. The plastic part is molded on the conductive part 311 or fixedly connected to the conductive part 311 to form an integral middle frame 300.

[0104] See also Fig.17 The main branch 11 and the parasitic branch 41 are both part of the frame 320 .

[0105] In an alternative embodiment, see Fig.17, the first branch segment 231 is a part of the conductive part 311, and the second branch segment 232 is a part of the conductive part 311. In this way, when processing the middle frame 300, the conductive part 311 corresponding to the main branch 11 is switched to an inverted L-shape, and the conductive part 311 is integrally connected or fixedly connected to the connecting protrusion 325 of the first feeding point B, and at the same time, the conductive part 311 is disconnected from the reference ground system. This embodiment can realize the processing of the auxiliary branch 23 and the fixed connection between the auxiliary branch 23 and the main branch 11 when processing the conductive part 311 of the middle frame 300, and the operation is simple and convenient.

[0106] In the embodiment with the parasitic branch 41 , the second branch segment 232 may also be interconnected with the parasitic branch 41 as a whole.

[0107] In another alternative embodiment, see Fig.18 , the second branch segment 232 is a part of the conductive portion 311, the first branch segment 231 is an inductor element, one end of the inductor element is electrically connected to the first feeding point B, and the other end of the inductor element is electrically connected to the second branch segment 232. The inductor element can be arranged on a circuit board. In this embodiment, by setting the first branch segment 231 as an inductor element, the space occupied by the second branch segment 232 can be reduced, and it is also convenient to design the first branch segment 231 with a suitable electrical length by adjusting the inductance value of the inductor element.

[0108] In yet another optional embodiment, see Fig.19 , the first branch segment 231 is a conductive trace, and the second branch segment 232 is a part of the conductive portion 311. One end of the conductive trace is electrically connected to the first feeding point B, and the other end of the conductive trace is electrically connected to the second branch segment 232. The conductive trace includes but is not limited to a microstrip line, etc. In this embodiment, by setting the first branch segment 231 as a conductive trace, the space occupied by the second branch segment 232 can be reduced, and it is also convenient to design the first branch segment 231 with a suitable electrical length by adjusting the length value of the conductive trace.

[0109] Optionally, the first radiator 10 may be disposed on the top edge 321 of the frame, and the parasitic branch 41 may be disposed at a position of the first radiator 10 close to the side edge.

[0110] In the embodiment with the third radiator 30, see Fig. 20 A portion of the third radiator 30 is disposed on the top edge 321, and another portion is disposed on the side edge, so that the antenna assembly 100 has a higher upper hemisphere occupancy when supporting the GPS frequency band.

[0111] In the implementation manner where both the first branch segment 231 and the second branch segment 232 are part of the conductive portion 311 , the embodiment of the present application improves the structure of the middle frame 300 .

[0112] Optionally, an embodiment of the present application provides a method for forming a middle frame 300. The method is used to prepare the middle frame 300, wherein the frame 320 of the middle frame 300 can be used as the main branch 11 of the antenna assembly 100, and the conductive portion 311 of the middle frame 300 can be used as the auxiliary branch 23 of the antenna assembly 100, and the auxiliary branch 23 can disperse the current intensity on the main branch 11. The auxiliary branch 23 is farther away from the human body than the main branch 11, that is, part of the current on the main branch 11 is set at a position farther away from the human body, thereby reducing the SAR value of the antenna operation, reducing the absorption of electromagnetic radiation by the human body, and reducing the power back-off of the antenna assembly 100.

[0113] See also Fig.21 The middle frame 300 forming method includes the following steps:

[0114] Step S100 : providing a conductive plate, forming a frame 320 and a conductive portion 311 on the conductive plate, wherein the conductive portion 311 is disposed inside the frame 320 and is integrally formed with the frame 320 .

[0115] Optionally, a frame 320 and a conductive part 311 are processed on the conductive plate by a numerical control milling machine (CNC). The frame 320 is roughly rectangular. The conductive part 311 is interconnected with the frame 320 as a whole and is arranged inside the frame 320. The size of the conductive part 311 in the thickness direction of the electronic device 1000 is smaller than the size of the frame 320 in the thickness direction of the electronic device 1000. The conductive part 311 is a conductive sheet to form a support structure or a connecting structure. Subsequently, a plastic part is formed on the conductive part 311 or the plastic part is fixedly connected to the conductive part 311 to form an integral middle frame 300.

[0116] Step S200: Please refer to Fig. 22 , cutting the frame 320 to form a main branch 11 and a parasitic branch 41 that are arranged at intervals, the main branch 11 includes a first free end C, a first feeding point B and a first grounding point A that are arranged in sequence, the first grounding point A is used for grounding, and the first free end C and the parasitic branch 41 are arranged at intervals.

[0117] Specifically, the structure of the main branch 11 may refer to the above description of the main branch 11 .

[0118] Step S300: Cut the conductive portion 311 to form an auxiliary branch 23, at least a portion of the auxiliary branch 23 is close to the inner side of the frame 320 relative to the main branch 11, and the auxiliary branch 23 includes a first connection end 23a and a second connection end 23b, the first connection end 23a is connected to the first feeding point B, and the second connection end 23b extends in a direction away from the first feeding point B and connects to the parasitic branch 41. The first feeding point B is used to feed an excitation signal to excite the first feeding point B to the first free end C to form a first resonance mode supporting the first frequency band, and to excite the first feeding point B to the second connection end 23b to form a second resonance mode supporting the first frequency band.

[0119] The specific structure of the auxiliary branch 23 can refer to the above description.

[0120] In an optional embodiment, when processing the middle frame 300, the conductive portion 311 corresponding to the main branch node 11 is switched to an inverted L shape, and the conductive portion 311 is integrally connected or fixedly connected to the connection protrusion 325 of the first feeding point B, and at the same time, the conductive portion 311 is disconnected from the reference ground system. This embodiment can realize the processing of the auxiliary branch node 23 and the fixed connection between the auxiliary branch node 23 and the main branch node 11 when processing the conductive portion 311 of the middle frame 300, and the operation is simple and convenient.

[0121] In the embodiment with the parasitic branch 41 , the second branch segment 232 may also be interconnected with the parasitic branch 41 as a whole.

[0122] Optionally, the first resonance mode is a 1 / 4 wavelength mode of the first frequency band, and the second resonance mode is a 1 / 2 wavelength mode of the first frequency band.

[0123] Furthermore, the electrical length between the first feeding point B and the first free end C is approximately or is 1 / 4 wavelength of the first frequency band, and the electrical length between the first feeding point B and the second connecting end 23b is approximately 1 / 2 wavelength of the first frequency band, so that the first feeding point B feeds an excitation signal to stimulate the first feeding point B to the first free end C to form a 1 / 4 wavelength mode supporting the first frequency band, and stimulates the first feeding point B to the second connecting end 23b to form a 1 / 4 wavelength mode supporting the first frequency band.

[0124] Through the above design, when the antenna component 100 works in the first frequency band, the first resonant mode and the second resonant mode are generated simultaneously, a part of the resonant current is distributed between the first feed point B and the first free end C, and the other part of the resonant current is distributed between the first feed point B and the first connection end 23a. The resonant current of the antenna component 100 without the auxiliary branch 23 when working in the first frequency band is distributed between the first feed point B and the first free end C. Compared with the antenna component 100 without the auxiliary branch 23, the antenna component 100 provided in the present application changes the distribution of the resonant current when working in the first frequency band. By setting the auxiliary branch 23 that can generate the resonant mode of the first frequency band, a part of the resonant current when working in the first frequency band is pulled down to the inner side of the frame and further away from the human body, and the resonant current intensity on the main branch 11 is dispersed to the auxiliary branch 23. In this way, the SAR value at a certain distance (for example, 5 cm) outside the frame is reduced because the resonant current intensity on the main branch 11 is dispersed.

[0125] Step S200: includes:

[0126] See also Fig. 22 , cutting the frame 320, forming a first slit 10a and a second slit 10b on the frame 320, wherein the first slit 10a is located between the main branch 11 and the parasitic branch 41, and the second slit 10b is located on the side of the parasitic branch 41 away from the main branch 11. The parasitic branch 41 is located between the first slit 10a and the second slit 10b. In other words, the parasitic branch 41 is the frame 320.

[0127] Step S300: includes:

[0128] See also Fig. 22 , cutting the conductive portion 311, forming a first slot 20a connected to the first slit 10a, and a second slot 20b connected to the second slit 10b on the conductive portion 311, and the conductive portion 311 between the first slot 20a and the second slot 20b is an auxiliary branch 23.

[0129] Specifically, the second slot 20b extends in the direction of the frame 320 where the second gap 10b is located. For example, if the first gap 10a is at the top edge 321, the second slot 20b extends along the top edge 321. The second slot 20b is used to disconnect the auxiliary branch 23 from the reference floor.

[0130] The first slot 20a extends from the first slit 10a toward the location of the first feeding point B. The extending direction of the first slot 20a is the same as the extending direction of the second slot 20b.

[0131] The present application provides a method for forming a middle frame 300 , which can realize the processing of the auxiliary branch nodes 23 and the fixed connection between the auxiliary branch nodes 23 and the main branch nodes 11 when processing the conductive part 311 of the middle frame 300 , and the operation is simple and convenient.

[0132] See also Fig. 22 , an embodiment of the present application provides a middle frame 300 , and the middle frame 300 includes a frame 320 and a conductive portion 311 .

[0133] The frame 320 includes a main branch 11 and a parasitic branch 41 arranged at intervals. The main branch 11 includes a first free end C, a first feeding point B and a first grounding point A arranged in sequence. The parasitic branch 41 includes a second free end 411, which is opposite to the first free end C and arranged at intervals.

[0134] The conductive portion 311 is disposed inside the frame 320 and is integrally formed with the frame 320. The thickness of the conductive portion 311 (the dimension along the thickness direction of the electronic device 1000) is less than the thickness of the frame 320. The conductive portion 311 includes an auxiliary branch 23, a first connection end 23a of the auxiliary branch 23 is electrically connected to the first feeding point B, a second connection end 23b of the auxiliary branch 23 extends toward a side away from the first grounding point A and is connected to the parasitic branch 41, and the first feeding point B is used to feed an excitation signal to excite the first feeding point B to the first free end C to form a first resonance mode supporting the first frequency band, and to excite the first feeding point B to the second connection end 23b to form a second resonance mode supporting the first frequency band.

[0135] The first feeding point B is used to feed an excitation signal to excite the first feeding point B to the first free end C to form a first resonance mode supporting a first frequency band, and to excite the first feeding point B to the second connecting end 23b to form a second resonance mode supporting the first frequency band.

[0136] The present application provides a middle frame 300, wherein a portion of the conductive portion 311 on the middle frame 300 can be used as a portion of the auxiliary branch node 23 to form a portion of the antenna assembly 100, thereby changing the resonant current distribution when operating in the first frequency band. By setting the auxiliary branch node 23 that can generate the resonant mode of the first frequency band, a portion of the resonant current when operating in the first frequency band is pulled down to a position inside the frame 320 that is farther away from the human body, and the resonant current intensity on the main branch node 11 is dispersed to the auxiliary branch node 23. In this way, the SAR value at a certain distance (for example, 5 cm) outside the frame 320 is reduced because the resonant current intensity on the main branch node 11 is dispersed.

[0137] From another perspective, the electronic device 1000 provided in the embodiment of the present application includes a signal source (first signal source 20), a reference floor 600, and a middle frame 300 as described in any of the above embodiments. The signal source is electrically connected to the first feeding point B, and the reference floor 600 is electrically connected to the first grounding point A to form the above antenna assembly 100.

[0138] In the following, in conjunction with the accompanying drawings, the auxiliary branch 23 includes a first branch segment 231, a second branch segment 232 and a parasitic branch 41, wherein the parasitic branch 41 is located between the main branch 11 and the third radiator 30, the main branch 11 and the parasitic branch 41 are the frame 320, and the first branch segment 231 and the second branch segment 232 are the conductive portion 311. The parasitic branch 41 is disconnected from the reference floor, and the parasitic branch 41 is connected to the connecting protrusion 325 at the first feeding point B through the second branch segment 232 and the first branch segment 231, forming a one-feed two-path structure. The parasitic branch 41 is in a rectangular bent shape when connected to the connecting protrusion 325, and can also be connected in an arc or other vertex-free form.

[0139] In order to better demonstrate the effect of this solution, the simulation results of this solution are compared with those of an antenna comparison solution without the first branch segment 231 and the second branch segment 232 .

[0140] See also Fig.23 , Fig.23 It is an S parameter and efficiency curve diagram of the antenna without the first branch segment 231 and the second branch segment 232. Curve a is the S parameter curve of the antenna without the first branch segment 231 and the second branch segment 232. Curve b is the radiation efficiency curve of the antenna without the first branch segment 231 and the second branch segment 232. Curve c is the total efficiency curve of the antenna without the first branch segment 231 and the second branch segment 232. It can be seen from curve a that the antenna supports the GPS-L1+N78+Wi-Fi 5G frequency bands. It can be seen from curve b that the efficiency under the GPS-L1 frequency band is -4dB, the N78 efficiency is -4.3dB, and the Wi-Fi 5G efficiency is -3.3dB.

[0141] See also Fig.24 , Fig.24 3.55 GHz is a schematic diagram of the SAR hotspot distribution of the antenna without the first branch segment 231 and the second branch segment 232. The SAR hotspot corresponding to the N78 frequency band is mainly concentrated just above the first feeding point B. When the input power is 26 dBm, the SAR value of the N78 frequency band at 3.55 GHz is 4.3 W / kg.

[0142] See also Fig.25 , Fig.25It is an S parameter and efficiency curve diagram of the antenna assembly 100 provided in the embodiment of the present application. Curve a is the S parameter curve of the antenna assembly 100 provided in the embodiment of the present application. Curve b is the radiation efficiency curve of the antenna assembly 100 provided in the embodiment of the present application. Curve c is the total efficiency curve of the antenna assembly 100 provided in the embodiment of the present application. It can be seen from curve a that the antenna supports GPS-L1+N78+Wi-Fi 5G frequency bands. It can be seen from curve b that the efficiency in the GPS-L1 frequency band is -4dB, the efficiency in the N78 frequency band is -4.2dB, and the efficiency in the Wi-Fi 5G frequency band is -2.8dB.

[0143] See also Fig.26 , Fig.26 It is a schematic diagram of the SAR hotspot distribution of the antenna assembly 100 provided in the embodiment of the present application at 3.55GHz. The SAR hotspot corresponding to the N78 frequency band is mainly concentrated just above the first feeding point B. When the input power is 26dbm, the SAR value of the N78 frequency band at 3.55GHz is 3.3W / kg. Compared with the antenna without the first branch segment 231 and the second branch segment 232, the antenna assembly 100 provided in the embodiment of the present application has equivalent efficiency at the GPS L1 frequency band and the N78 frequency band, and the efficiency of the Wi-Fi 5G frequency band is improved by 0.5dB. This is because the antenna assembly 100 provided in the embodiment of the present application has added a loop mode of the Wi-Fi5G frequency band. Moreover, the antenna assembly 100 provided in the embodiment of the present application has a significant SAR reduction effect in the N78 frequency band. While reducing SAR, the present application ensures the efficiency of the original frequency band, and the Wi-Fi 5G efficiency is improved by 0.5Db.

[0144] See also Fig. 27 , Fig. 27 2 is a resonant current distribution diagram of an antenna without the first branch segment 231 and the second branch segment 232 in the N78 frequency band. Fig.28 , Fig.28 It is a resonant current distribution diagram of the antenna assembly 100 provided in an embodiment of the present application in the N78 frequency band.

[0145] By comparison, Fig. 27 The strong points of the resonant current are mainly concentrated between the first feeding point B and the first free end C, which is on the frame. Fig.28The resonant current is not only distributed between the first feeding point B and the first free end C, but also distributed on the first branch segment 231 and the second branch segment 232 of the auxiliary branch 23. In this way, the auxiliary branch 23 plays a role in dispersing the resonant current. In addition, since the first branch segment 231 and the second branch segment 232 of the auxiliary branch 23 are 1-5mm lower than the main branch 11, they are further away from the human body, and the resonant current is dispersed to a position away from the human body, so as to achieve the effect of being away from the absorbing human body, reduce the human body's absorption of electromagnetic radiation, and reduce the SAR value. It can be seen from the N78 resonant current that the embodiment of the present application feeds the auxiliary branch 23 and the main branch 11 together, which plays a role in dispersing the resonant current and keeping the resonant current away from the human body, so as to reduce the SAR value of the N78 frequency band, and thus solve the problem of the N78 joint SAR over-standard fallback.

[0146] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. An electronic device, characterized in that: An antenna assembly is included, the antenna assembly comprising: A first radiator includes a main branch, a parasitic branch and an auxiliary branch, wherein the main branch includes a first free end, a first feeding point and a first grounding point which are arranged in sequence; the parasitic branch includes a second free end which is opposite to and spaced from the first free end, at least a portion of the auxiliary branch is close to the inner side of the electronic device relative to the main branch, the auxiliary branch includes a first connecting end and a second connecting end, the first connecting end of the auxiliary branch is connected to the first feeding point, and the second connecting end of the auxiliary branch is connected to the parasitic branch; and A first signal source, the first signal source is electrically connected to the first feeding point, and the first signal source is used to excite the first feeding point to the first free end to form a first resonant mode supporting a first frequency band, and to excite the first feeding point to the second free end to form a second resonant mode supporting the first frequency band.

2. The electronic device according to claim 1, wherein: The electrical length between the first feeding point and the second free end is 1 / 4 wavelength of the first frequency band.

3. The electronic device according to claim 1, wherein: The first resonance mode is a 1 / 4 wavelength mode of the first frequency band; the second resonance mode is a 1 / 4 wavelength mode of the first frequency band.

4. The electronic device according to claim 1, wherein: The auxiliary branch node includes a first branch node segment, the extension direction of the first branch node segment is consistent with the extension direction of the main branch node, the first branch node segment is close to the inner side of the electronic device relative to the main branch node, one end of the first branch node segment is electrically connected to the first feeding point, and the first branch node segment extends toward a side away from the first grounding point.

5. The electronic device according to claim 4, characterized in that: The auxiliary branch also includes a second branch segment, which intersects with the first branch segment, one end of the second branch segment is connected to an end of the first branch segment away from the first feeding point, and the other end of the second branch segment extends toward the parasitic branch and connects to the parasitic branch.

6. The electronic device according to claim 5, characterized in that: The first signal source is further used to excite the first feeding point to the first free end to form a third resonance mode supporting the second frequency band, and to excite the first free end to the second free end to form a fourth resonance mode supporting the second frequency band.

7. The electronic device according to claim 6, characterized in that: The first frequency band includes the N78 frequency band, the second frequency band includes the Wi-Fi 5G frequency band, the third resonance mode is a 1 / 4 wavelength mode supporting the second frequency band, and the fourth resonance mode is a loop mode supporting the second frequency band.

8. The electronic device according to claim 1, wherein: The parasitic branch further includes a third free end, and the third free end is arranged opposite to the second free end.

9. The electronic device according to claim 6, characterized in that: The parasitic branch further includes a second grounding point, the second grounding point is arranged opposite to the second free end, and the first free end and the second free end are coupled via a gap.

10. The electronic device according to claim 9, characterized in that: The first signal source is also used to excite the formation of a fifth resonance mode supporting the second frequency band between the second free end and the second grounding point; the second frequency band includes at least one of a Wi-Fi band, an LTE band, and an NR band; the third resonance mode is a 1 / 4 wavelength mode supporting the second frequency band, the fourth resonance mode is a loop mode supporting the second frequency band, and the fifth resonance mode is a 1 / 4 wavelength mode supporting the second frequency band.

11. The electronic device according to claim 8, characterized in that: The antenna assembly also includes a third radiator and a second signal source, the third radiator includes a third grounding point, a second feeding point and a fourth free end arranged in sequence, the fourth free end is spaced apart from the third free end, the second signal source is electrically connected to the second feeding point, and the second signal source is used to excite a sixth resonance mode supporting a third frequency band between the second feeding point and the fourth free end, and to excite a seventh resonance mode supporting a fourth frequency band between the third grounding point and the fourth free end.

12. The electronic device according to claim 11, characterized in that: The third frequency band includes the Wi-Fi 2.4G frequency band, and the sixth resonance mode is a 1 / 4 wavelength mode of the third frequency band; the fourth frequency band includes the MHB frequency band, and the seventh resonance mode is a 1 / 4 wavelength mode of the fourth frequency band.

13. The electronic device according to claim 5, characterized in that: The electronic device further comprises a middle frame, the middle frame comprises a frame portion and a conductive portion, the conductive portion and the frame portion are interconnected as one body and the conductive portion is arranged inside the frame portion, the main branch node and the parasitic branch node are both part of the frame portion, and the second branch node segment is part of the conductive portion; The first branch segment is a part of the conductive portion; or, the first branch segment is an inductor element; or, the first branch segment is a conductive trace.

14. The electronic device according to any one of claims 1 to 13, characterized in that: The first signal source is further used to excite the first ground point to the first free end to form an eighth resonance mode supporting a fifth frequency band, the fifth frequency band includes a GPS frequency band, and the eighth resonance mode is a 1 / 4 wavelength mode of the fifth frequency band.

15. A middle frame, characterized in that: The middle frame includes: A frame portion, the frame portion comprising a main branch and a parasitic branch arranged at intervals, the main branch comprising a first free end, a first feeding point and a first grounding point arranged in sequence, the parasitic branch comprising a second free end, the second free end being opposite to the first free end and arranged at intervals; and A conductive portion, wherein the conductive portion is arranged inside the frame portion and is integrally formed with the frame portion, the conductive portion includes an auxiliary branch node, a first connection end of the auxiliary branch node is electrically connected to the first feeding point, a second connection end of the auxiliary branch node extends toward a side away from the first grounding point and is connected to the parasitic branch node, and the first feeding point is used to feed an excitation signal to excite the first feeding point to the first free end to form a first resonant mode supporting a first frequency band, and to excite the first feeding point to the second free end to form a second resonant mode supporting the first frequency band.

16. An electronic device, characterized in that: It comprises a signal source, a reference floor and the middle frame as claimed in claim 15, wherein the signal source is electrically connected to the first feeding point, and the reference floor is electrically connected to the first grounding point.

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