Electronic device

Abstract

The invention discloses electronic equipment. A first connection point on a second radiator is located at a second free end or is arranged adjacent to the second free end; one end of the capacitive tuning circuit is electrically connected with the first connection point, and the other end of the capacitive tuning circuit is grounded; the first signal source excites the first radiator to form a first resonance mode supporting a first low frequency; the first signal source further excites the second radiator and the capacitive tuning circuit to form an annular mode supporting a second low frequency, resonance current of the annular mode is grounded from the first grounding end and the second radiator through the first connection point and the tuning circuit, and the first low frequency and the second low frequency form a continuous frequency band. The sub-band switching of the first low frequency and the sub-band switching of the second low frequency are mutually independent. The invention provides electronic equipment for improving the working performance of a low-frequency antenna.

Description

Technical Field

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

[0002] As the communication functions on electronic devices increase, low-frequency antennas on electronic devices are widely used. How to improve the working performance of low-frequency antennas has become a technical problem that needs to be solved. Summary of the invention

[0003] The present application provides an electronic device for improving the working performance of a low-frequency antenna.

[0004] The present application provides an electronic device,

[0005] The electronic device includes an antenna assembly, the antenna assembly including:

[0006] A first radiator, the first radiator comprising a first free end, a first feeding point and a first grounding end which are arranged in sequence;

[0007] a second radiator, the second radiator comprising a second ground end and a second free end disposed opposite to each other, a coupling gap being formed between the second free end and the first free end, the second radiator further comprising a first connection point, the first connection point being located at the second free end or disposed adjacent to the second free end;

[0008] a capacitive tuning circuit, one end of the capacitive tuning circuit being electrically connected to the first connection point, and the other end of the capacitive tuning circuit being grounded; and

[0009] a first signal source, the first signal source being electrically connected to the first feeding point to excite the first radiator to form a first resonant mode supporting a first low frequency;

[0010] The first signal source also excites the second radiator and the capacitive tuning circuit to form a ring mode supporting a second low frequency. The resonant current of the ring mode flows from the first ground terminal, the second radiator, through the first connection point, and the capacitive tuning circuit to the ground. The first low frequency and the second low frequency form a continuous frequency band, and the sub-band switching of the first low frequency and the sub-band switching of the second low frequency are independent of each other.

[0011] The electronic device provided by the present application comprises a first radiator including a first free end, a first feeding point and a first grounding end arranged in sequence; a second radiator including a second grounding end and a second free end arranged opposite to each other, a coupling gap is formed between the second free end and the first free end, and the second radiator also includes a first connection point, the first connection point is located at the second free end or is arranged adjacent to the second free end; one end of the capacitive tuning circuit is electrically connected to the first connection point, and the other end of the capacitive tuning circuit is grounded; a signal source is electrically connected to the first feeding point to excite the first radiator to form a first resonant mode supporting a first low frequency; the signal source also excites the second radiator and The capacitive tuning circuit forms a ring mode that supports the second low frequency. The resonant current of the ring mode goes to the ground from the first grounding end, the second radiator, the first connection point, and the tuning circuit. The first low frequency and the second low frequency form a continuous frequency band. The first resonant mode and the ring mode are integrated. The sub-band switching of the first low frequency and the sub-band switching of the second low frequency are independent of each other, realizing dual-wave and dual-cutting without affecting each other. The second radiator and the capacitive tuning circuit are equivalent to an LC resonant circuit. The capacitive tuning circuit tunes the ring mode that supports the low frequency. The first resonant mode and the ring mode form a dual-wave resonance that supports the low frequency, so as to improve the working performance of the low frequency antenna. 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 is a partial exploded schematic diagram of an electronic device provided in an embodiment of the present application;

[0015] Figure 3 It is a structural schematic diagram of a frame and an antenna assembly provided in an embodiment of the present application;

[0016] Figure 4 is a schematic structural diagram of an antenna assembly provided in the first embodiment of the present application;

[0017] Figure 5 is a schematic structural diagram of an antenna assembly provided in a second embodiment of the present application;

[0018] Figure 6 yes Figure 5 A schematic diagram of current distribution in a ring mode of the provided antenna assembly;

[0019] Figure 7 is a structural schematic diagram of an antenna assembly including a switch tuning circuit provided in an embodiment of the present application;

[0020] Figure 8It is a structural schematic diagram of a capacitive tuning circuit of an antenna assembly provided in an embodiment of the present application, including a first switch unit and a plurality of capacitive elements;

[0021] Fig. 9 is a structural schematic diagram of a switch tuning circuit provided in an embodiment of the present application, including a second switch unit and a plurality of impedance tuning branches;

[0022] Fig.10a This is a schematic diagram of a straight-bar electronic device provided by the present application being held in the left hand;

[0023] Fig.10b This is a schematic diagram of a straight-bar electronic device provided by the present application being held in the right hand;

[0024] Fig.11a It is a schematic diagram of a foldable electronic device provided by the present application, with a hinge on top and held by the right hand;

[0025] Fig.11b This is a schematic diagram of a foldable electronic device provided by the present application, with the hinge on top and held by the left hand;

[0026] Fig.12 yes Figure 4 Provide S parameters, radiation efficiency, and total efficiency curves of the antenna assembly in the scenarios of closed cover + free space and closed cover + left hand holding;

[0027] Fig.13 This is an embodiment of the present application Figure 4 Provide S parameters, radiation efficiency, and total efficiency curves of the antenna assembly in the scenarios of closed cover + free space and closed cover + right-hand holding;

[0028] Fig.14 is a structural schematic diagram of an electronic device provided in an embodiment of the present application being a foldable electronic device;

[0029] Fig.15 is a resonant current distribution diagram of the first resonant mode of the antenna assembly provided in an embodiment of the present application;

[0030] Fig.16 It is a structural schematic diagram of a capacitive tuning circuit of an antenna assembly provided in an embodiment of the present application as a capacitor;

[0031] Fig.17 yes Figure 4 Provide S-parameter curves and efficiency curves of antenna components;

[0032] Fig.18 It is a schematic diagram of a structure in which a first connection point and a second free end are arranged at intervals according to an embodiment of the present application;

[0033] Fig.19 is a schematic diagram of a structure in which the second ground terminal provided in an embodiment of the present application is located on the second side;

[0034] Fig. 20 The S parameters and efficiency curves of the antenna assembly provided in the embodiments of the present application, in which the second connection point is located at the second free end and the antenna assembly in which the distance between the second connection point and the second free end is 3 mm;

[0035] Fig.21 This is an efficiency comparison diagram of not setting the second radiator, setting the length of the second radiator to be close to 1 / 8 of the wavelength of the second low frequency and the capacitance of the capacitive tuning circuit to be 2pF, setting the length of the second radiator to be close to 1 / 8 of the wavelength of the second low frequency and the capacitance of the capacitive tuning circuit to be 2.5pF, and setting the length of the second radiator to be greater than 1 / 8 of the wavelength and less than 1 / 4 of the wavelength of the second low frequency;

[0036] Fig. 22 yes Figure 5 The S-parameter curves of the provided antenna assembly in right hand closed, right head hand closed, free closed, left hand closed, left head hand closed, and free unfolded;

[0037] Fig.23 yes Figure 5 The efficiency curves of the provided antenna assembly in right hand closed, right head hand closed, free closed, left hand closed, left head hand closed, and free unfolded;

[0038] Fig.24 is a schematic diagram of a structure in which a second ground terminal is aligned with a first ground terminal provided in an embodiment of the present application;

[0039] Fig.25 yes Fig.24 Schematic diagram of the current distribution of the antenna assembly on the reference floor;

[0040] Fig.26 is a structural schematic diagram including a third switch unit and a fourth switch unit provided in an embodiment of the present application;

[0041] Fig. 27 is a schematic structural diagram of an antenna assembly in an unfolded state provided in a third embodiment of the present application;

[0042] Fig.28 is a side view schematic diagram of an antenna assembly provided in a third embodiment of the present application in a folded state;

[0043] Fig.29 is a current distribution diagram of a first sub-mode of an antenna assembly in a folded state provided by a third embodiment of the present application;

[0044] Fig.30 This is a current distribution diagram of the second sub-mode of the antenna assembly provided in the third embodiment of the present application in a folded state. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] See also Figure 1 , Figure 1 The 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 may refer to this embodiment.

[0049] See also Figure 2 , Figure 21 is a partial exploded schematic diagram of an electronic device 1000. The electronic device 1000 includes an antenna assembly 100. 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 mainboard, a camera module, a receiver module, a battery, and various sensors. One side of the frame 320 is connected to the edge of the display screen 200, and the other side of the frame 320 is connected to 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 integrated structure, and the frame 320 and the back cover 400 can be a separate structure. 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.

[0050] Optionally, the electronic device 1000 is a non-foldable electronic device, such as a bar-type mobile phone.

[0051] Optionally, the electronic device 1000 is a foldable electronic device, such as a foldable mobile phone.

[0052] See also Figure 3 , Figure 33 is a back view of the electronic device 1000. 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 uses it in portrait mode, and the bottom edge 322 is the side facing the ground when the user holds the electronic device 1000 and uses it in portrait mode. The first side edge 323 is the left side when the user holds the electronic device 1000 and uses it in portrait mode. The second side edge 324 is the right side when the user holds the electronic device 1000 and uses it in portrait mode. Of course, the first side edge 323 can also be the right side when the user holds the electronic device 1000 and uses it. The second side edge 324 is the left side when the user holds the electronic device 1000 and uses it. From the perspective of holding, when the user holds and uses the electronic device 1000 in portrait mode, the hand generally holds the first side edge 323 and the second side edge 324, and the hand holds the bottom edge 322 of the part or does not hold the bottom edge 322. The hand does not hold the top edge 321 and the distance between the hand and the top edge 321 is greater than the distance between the hand and the bottom edge 322. Taking the electronic device 1000 as a mobile phone as an example, the distance between the top edge 321 and the camera module in the electronic device 1000 is greater than the distance between the bottom edge 322 and the camera module in the electronic device 1000.

[0053] The specific structure of the antenna assembly 100 is described below by way of example with reference to the accompanying drawings.

[0054] See also Figure 4 and Figure 5 The antenna assembly 100 includes a first radiator 11 , a second radiator 22 , a capacitive tuning circuit 40 and a first signal source 12 .

[0055] See also Figure 4 and Figure 5 The first radiator 11 includes a first free end D, a first feeding point B and a first ground end A which are arranged in sequence.

[0056] The first free end D is an end portion disconnected from other conductive structures.

[0057] The first signal source 12 is electrically connected to the first feeding point B to excite the first radiator 11 to form a first resonant mode supporting a first low frequency. The first signal source 12 includes but is not limited to a radio frequency transceiver chip. The first signal source 12 excites the first radiator 11 to form a resonance, which is used to transmit and receive a first low frequency electromagnetic wave signal.

[0058] The second radiator 22 includes a second free end E and a second ground end G that are disposed opposite to each other. A coupling gap is formed between the second free end E and the first free end D.

[0059] See also Figure 4 and Figure 5 , the second radiator 22 also includes a first connection point F. The first connection point F is located at the second free end or is arranged adjacent to the second free end. One end of the capacitive tuning circuit 40 is electrically connected to the first connection point F, and the other end of the capacitive tuning circuit 40 is grounded. The electrical length of the second radiator 22 is much smaller than the electrical length of the first radiator 11. The electrical length of the second radiator 22 cannot excite a low-frequency resonant mode. At this time, the second radiator 22 can be equivalent to an inductor. An equivalent LC resonant circuit is formed between the second radiator 22 and the capacitive tuning circuit 40, and the capacitive tuning circuit 40 is used to lower the resonant frequency of the equivalent LC resonant circuit to the second low frequency.

[0060] See also Figure 6 The first signal source 12 also excites the second radiator and the capacitive tuning circuit 40 (i.e., the equivalent LC resonant circuit) to form a ring mode supporting a second low frequency. The resonant current of the ring mode flows from the first ground terminal, the second radiator, through the first connection point F, and the capacitive tuning circuit 40 to the ground.

[0061] Among them, the first low frequency supported by the first resonance mode and the second low frequency supported by the second resonance mode form a continuous frequency band. In this way, the first resonance mode and the annular mode form a well-fused dual wave. The improvement effect of the annular mode on the first resonance mode is more obvious, and the low-frequency bandwidth is increased, reducing the influence of hand-holding frequency deviation, etc.

[0062] Furthermore, the switching of the first low-frequency sub-band and the second low-frequency sub-band is independent of each other. The capacitive tuning circuit 40 is used to switch the second low-frequency sub-band.

[0063] See also Figure 7 , the antenna assembly 100 also includes a switch tuning circuit 50. One end of the switch tuning circuit 50 is electrically connected to the second connection point C of the first radiator 11. The other end of the switch tuning circuit 50 is grounded. The switch tuning circuit 50 is used to switch the sub-band of the first low frequency supported by the first resonant mode. Among them, when the capacitive tuning circuit 40 switches the sub-band of the second low frequency, it will not affect the first low frequency, and when the switch tuning circuit 50 switches the sub-band of the first low frequency, it will not affect the second low frequency. In this way, the first resonant mode and the ring mode are integrated and independent of each other.

[0064] The second radiator 22 acts as a parasitic radiator of the first radiator 11. The second radiator 22 needs an electrical length of about 1 / 4 wavelength of the low frequency to generate an intrinsic resonance mode under the action of the first signal source 12. However, the electrical length of the second radiator 22 is much smaller than the electrical length of the first radiator 11, so the electrical length of the second radiator 22 cannot excite a low-frequency resonance mode. The capacitive tuning circuit 40 is used to form an equivalent LC resonant circuit with the second radiator 22, and tune the resonance point of the equivalent LC resonant circuit to a low-frequency band. In this way, the equivalent LC resonant circuit formed by the second radiator 22 and the capacitive resonant circuit and the first radiator 11 form a dual-wave resonance supporting low frequency under the excitation of the first signal source 12, thereby improving the low-frequency efficiency and bandwidth.

[0065] See also Figure 7 , the second connection point C of the first radiator 11 is located at the first feeding point B or between the first feeding point B and the first free end D.

[0066] The electronic device provided by the present application comprises a first radiator 11 including a first free end D, a first feeding point B and a first grounding end A which are arranged in sequence, wherein the first free end D is located at the bottom edge 322, a second radiator 22 including a second grounding end G and a second free end E which are arranged opposite to each other, a coupling gap is formed between the second free end E and the first free end D, the second radiator 22 further comprises a first connection point F, the first connection point F is located at the second free end E or is arranged adjacent to the second free end E, one end of the capacitive tuning circuit 40 is electrically connected to the first connection point F, the other end of the capacitive tuning circuit 40 is grounded, a signal source is electrically connected to the first feeding point B to excite the first radiator 11 to form a first resonant mode supporting a first low frequency, and the first signal source 12 also excites The second radiator 22 and the capacitive tuning circuit 40 are excited to form a ring mode supporting the second low frequency. The resonant current of the ring mode is grounded from the first ground terminal A, the second radiator 22, the first connection point F, and the capacitive tuning circuit 40. The first low frequency and the second low frequency form a continuous frequency band. The first resonant mode and the ring mode are integrated. The sub-band switching of the first low frequency and the sub-band switching of the second low frequency are independent of each other, realizing dual-wave and dual-cutting without affecting each other. The second radiator 22 and the capacitive tuning circuit 40 are equivalent to an equivalent LC resonant circuit. The capacitive tuning circuit 40 tunes the ring mode supporting the low frequency. The first resonant mode and the ring mode form a dual-wave resonance supporting the low frequency, so as to improve the working performance and anti-hand-holding performance of the low-frequency antenna.

[0067] See also Figure 7 The capacitive tuning circuit 40 includes a capacitive element. The number of the capacitive element is at least one.

[0068] See also Figure 8, the capacitive tuning circuit 40 also includes a first switch unit K1. The first switch unit K1 is electrically connected to the first connection point F and at least one capacitive element. The first switch unit K1 is used to switch the first connection point F to any one or more of the capacitive elements to switch the second low-frequency sub-band supported by the annular mode. When the first switch unit K1 switches the first connection point F to any one or more of the capacitive elements to be turned on, the switchable capacitive tuning circuit has different capacitance values ​​(or impedance values), and the capacitive elements with different capacitance values ​​tune the equivalent LC resonant circuit to different resonance points, thereby switching the annular mode to support different low-frequency sub-bands, for example, switching from B8 to B5, from B5 to B28, etc.

[0069] Optionally, the capacitance value of the capacitive element is less than or equal to 10 pF. Since the second radiator 22 having a length of about 1 / 8 wavelength of the second low frequency can be equivalent to an inductor, for example, 10-20 nH. The capacitive tuning circuit 40 is set as a capacitive element, and the capacitive element and the second radiator 22 form an equivalent LC circuit. The capacitance value of the capacitive element is a small capacitor, for example, the capacitance value is less than 10 pF, so as to pull the resonant frequency of the equivalent LC resonant circuit down to the low frequency band, that is, to form a ring mode supporting the second low frequency.

[0070] See also Fig. 9 The switch tuning circuit 50 includes a second switch unit K4 and a plurality of impedance tuning branches 51. By switching the conduction port of the second switch unit K4, the ground impedance of the switch tuning circuit 50 is tuned, and then the electrical length of the first radiator 11 is adjusted to switch the first low-frequency sub-band supported by the first resonant mode.

[0071] In this embodiment, a switch tuning circuit 50 is set to switch the first low-frequency sub-band supported by the first resonant mode, and the second low-frequency sub-band supported by the annular mode is tuned and switched by the capacitance value of the capacitive tuning circuit 40. The switching of the first low-frequency sub-band and the switching of the second low-frequency sub-band are independent of each other to achieve dual-wave dual-cutting.

[0072] See also Figure 10a-Figure 11b, the first side 323 and the second side 324 both include a palm holding area Z1 and a finger overlapping area Z2. The bottom edge 322 includes an open area Z3, which is not held by fingers. The finger overlapping area Z2 is located in the area of ​​the palm holding area Z1 away from the bottom edge 322. Among them, the finger overlapping area Z2 is the overlapping area in the first holding scenario. The palm holding area Z1 is the holding area in the second holding scenario. Among them, the first holding scenario is left-hand holding, and the second holding scenario is right-hand holding; or, the first holding scenario is right-hand holding, and the second holding scenario is left-hand holding. In the first holding scenario and the second holding scenario, the position of the open area Z3 of the bottom edge 322 remains unchanged.

[0073] See also Figure 10a-Figure 11b , Figure 10a-Figure 10b Taking the electronic device 1000 as a bar phone as an example, Figure 10a-Figure 10b It is a front view of the electronic device 1000 (the side where the display screen 200 is located). Figure 11a-Figure 11b Taking the electronic device 1000 as a foldable mobile phone with the hinge on top as an example, different holding states related to the present application are explained.

[0074] In the left-hand holding scenario, the area of ​​the first side 323 close to the bottom edge 322 is the palm holding area Z1, the middle area of ​​the first side 323 is the thumb overlapping area Z21 in the finger overlapping area Z2; the lower and middle part of the second side 324 is the finger overlapping area Z2.

[0075] In the right-hand holding scenario, the area of ​​the second side 324 close to the bottom 322 is the palm holding area Z1, and the area in the middle of the second side 324 is the thumb overlapping area Z21 in the finger overlapping area Z2; the middle and lower part of the first side 323 is the finger overlapping area Z2. It can be understood that due to the differences in the palm sizes of different users, when different users hold the same electronic device 1000 with the same gesture, there will be certain differences in the position where the fingers overlap on the frame 320 of the electronic device 1000 and the position where the palm is held on the frame of the electronic device 1000. As an example, the finger overlapping area Z2 and the palm holding area Z1 described in the present application can be the corresponding areas formed when users with palms of any size hold the electronic device 1000 of the present application with the same gesture. For example, the finger landing zone Z2 of the present application may be an area where the border 320 of the electronic device 1000 is landed by fingers when a user with a palm of any size holds the electronic device 1000 of the present application in the same gesture; the palm holding zone Z1 may be an area where the border 320 of the electronic device 1000 is covered by the palm and in contact with the palm when a user with a palm of any size holds the electronic device 1000 of the present application in the same posture.

[0076] The first free end D is located at the bottom edge 322. Further, the first free end D is located at an open area Z3 of the bottom edge 322. Optionally, the open area Z3 of the bottom edge 322 is located in an area that is more than 20 mm away from the first side edge 323 and the second side edge 324.

[0077] Since the first free end D is located at a point of strong electric field, its electric field direction is parallel to the frame (e.g., bottom edge 322). If the hand touches the first free end D, the energy of the parallel electric field will be absorbed, resulting in serious frequency deviation and other problems. In this embodiment, the first free end D is arranged in the open area Z3 of the bottom edge 322, and the open area Z3 of the bottom edge 322 is located in an area where the fingers will not hold in the left hand holding scene or the right hand holding scene, so as to avoid the first free end D from being affected by holding and reduce frequency deviation.

[0078] See also Figure 3 and Figure 4 , Figure 5 , the first grounding end A is located at the first side 323. The first grounding end A is between the finger overlapping area Z2 on the first side 323 and the bottom edge 322. Optionally, the distance between the finger overlapping area Z2 and the bottom edge 322 is greater than 40 mm. In this way, the distance between the first grounding end A and the bottom edge 322 is less than or equal to 40 mm.

[0079] At least part of the high current segment 110 of the first radiator 11 in the first resonance mode is disposed in the palm holding area Z1 to form dielectric loading under palm holding, thereby improving the radiation efficiency of the first resonance mode.

[0080] See also Figure 3 and Figure 4 , Figure 5 , the first radiator 11 also includes a strong current segment 110 in the first resonance mode. The vicinity of the first free end D (the length is about 1 / 5 of the total length of the first radiator 11) is a weak current segment. The current intensity of the strong current segment 110 is greater than the current intensity on the weak current segment. The first ground terminal A and the first feeding point B are both strong current points in the first resonance mode. The strong current segment 110 of the first radiator 11 in the first resonance mode is the area from the first ground terminal A to the position whose length from the first ground terminal A is 4 / 5 of the total length of the first radiator 11. All or part of the strong current segment 110 is located in the palm holding area.

[0081] See also Figure 3 and Figure 4 , Figure 5, at least part of the high current segment 110 is arranged in the palm holding area Z1 of the first side 323 (for example, the palm contacts the high current segment 110 when the left hand is held), and the high current segment 110 is used to form a dielectric loading for the first resonance mode when the palm is held. The palm holding area Z1 of the first side 323 is the area where the palm is pressed tightly when the left hand is held. For example, the palm holding area is an area on the first side 323 that is connected to the bottom edge 322 and is less than 40 mm. In addition, when the left hand is held, a part of the bottom edge 322 is also the palm holding area Z1, for example, an area that is connected to the first side 323 and is less than 20 mm.

[0082] The high current segment 110 may be entirely disposed in the palm holding area Z1 , or a portion of the high current segment 110 may be disposed in the palm holding area Z1 and another portion of the high current segment 110 may be disposed in an area outside the palm holding area Z1 on the bottom edge 322 .

[0083] Optionally, the first ground terminal A is located in the palm holding area Z1. Since the first ground terminal A is a strong current point in the first resonance mode, in a handheld scenario, when the palm contacts the first ground terminal A, the strong current can enhance the dielectric loading effect, thereby improving the radiation efficiency of the first resonance mode of the antenna assembly 100. Specifically, the distance between the first ground terminal A and the bottom edge 322 is less than 40 mm.

[0084] By designing the structure of the antenna assembly 100 and the installation position on the frame, the high current segment 110 of the antenna assembly 100 is located in the palm holding area Z1 of the first side 323, so that the high current segment 110 of the antenna assembly 100 can be held in the palm holding scenario, thereby forming a dielectric loading effect.

[0085] The following is a specific description of the dielectric loading formed by the antenna assembly 100 when the high current segment 110 is in the palm holding state: Since the high current segment 110 is arranged in the palm holding area Z1 of the first side 323. In the left hand holding scenario, the palm contacts the high current segment 110. The equivalent dielectric constant of the palm is relatively large, for example, 25-40, which is much larger than the dielectric constant of 0 in the air, so the palm contacting the high current segment 110 is equivalent to changing the radiation environment of the electromagnetic waves radiated by the high current segment 110. The palm forms a high dielectric constant medium in the radiation space of the electromagnetic wave. Based on the principle that the wavelength of electromagnetic waves will be shortened in a high dielectric constant medium, allowing the medium (such as the palm) to cover or surround the radiator can greatly reduce the volume of the antenna in the corresponding frequency band, that is, dielectric loading can play a role in miniaturization. In the electronic device 1000, since the length of the strong current segment 110 is equal before and after the palm is held, the equivalent dielectric constant around the strong current segment 110 is changed after the palm is held. Since the electrical length of the strong current segment 110 remains unchanged, according to the wavelength shortening effect, the radiation capacity will shift toward the low frequency, that is, the radiation efficiency peak shifts toward the low frequency side.

[0086] In the first resonant mode, the high current segment 110 encounters a high dielectric constant medium formed by the palm during the radiation process, so that the radiation efficiency peak in the first resonant mode will shift toward the low frequency side. Since the radiation efficiency of the first resonant mode at the first low frequency and the high frequency side of the first low frequency gradually increases, that is, the radiation efficiency at the high frequency side of the first low frequency is higher than the radiation efficiency of the first low frequency. Therefore, after the radiation efficiency peak of the first resonant mode shifts toward the low frequency side, the radiation efficiency of the first low frequency increases, that is, the antenna assembly 100 described in this article forms a dielectric loading in the hand-held state and the first resonant mode, thereby improving the radiation efficiency in the first resonant mode.

[0087] In this embodiment, the efficiency of the high current segment 110 of the first radiator 11 after dielectric loading on the first resonance mode is greater than the efficiency of the high current segment 110 of the first radiator 11 without dielectric loading on the first resonance mode. In other words, the high current segment 110 brings about efficiency improvement after dielectric loading on the first resonance mode.

[0088] Generally speaking, when the hand touches the radiator of the antenna assembly 100, the hand has an absorption effect on the electromagnetic waves radiated by the radiator. In the present application, since the area touched by the palm is not the radiation section where the first free end D is located, and the efficiency improvement brought by the dielectric loading of the palm on the antenna assembly 100 is greater than the efficiency reduction brought by the palm absorption effect, it is generally presented that the antenna assembly 100 forms dielectric loading in the palm holding state and the first resonance mode, thereby improving the radiation efficiency in the first resonance mode.

[0089] The above antenna assembly 100 is designed. When the antenna is held by the left hand, the first free end D of the antenna assembly 100 is located in the open area Z3 of the bottom edge 322 that is not held by the hand, thereby avoiding frequency deviation and the palm holding the strong current segment 110, thereby achieving dielectric loading at the first low frequency and improving the radiation efficiency of the first low frequency. When the antenna is held by the right hand, the first free end D of the antenna assembly 100 is located in the open area Z3 of the bottom edge 322 that is not held by the hand, and the first ground terminal A is located outside the finger overlapping area Z2, thereby reducing the absorption caused by the finger overlapping the first ground terminal A and reducing the efficiency, thereby improving the antenna performance in both the left hand holding scenario and the right hand holding scenario.

[0090] See also Fig.12 , Fig.12 yes Figure 4 The provided antenna assembly has S parameters, radiation efficiency, and total efficiency curves in the closed cover + free space and closed cover + left hand holding scenarios. Among them, curve a1 is Figure 4 The S parameters of the antenna assembly in closed cover + free space are provided. Curve b1 is Figure 4The radiation efficiency curve of the antenna assembly in the closed cover + free space is provided. Curve c1 is Figure 4 The total efficiency curve of the antenna assembly in the closed cover + free space is provided. Curve a2 is Figure 4 The S parameters of the antenna assembly in the closed cover + left hand holding scenario are provided. Curve b2 is Figure 4 The radiation efficiency curve of the antenna assembly provided in the closed cover + left hand holding scenario. Curve c2 is Figure 4 The total efficiency curve of the antenna assembly in the closed lid + left hand holding scenario is provided.

[0091] According to curve a1 and curve b1, Figure 4 The provided antenna assembly supports the B28 frequency band in both the closed cover + free space and closed cover + left hand holding scenarios. According to curve a2 and curve b2, Figure 4 The efficiency peak of the provided antenna assembly in closed cover + free space is located on the high frequency side of the B28 band. Figure 4 The efficiency peak of the provided antenna assembly in the closed cover + left hand holding scenario is located in the B28 frequency band. In other words, compared with the closed cover + free space, Figure 4 The efficiency peak of the provided antenna assembly in the closed cover + left hand holding scenario moves toward the low frequency side, thus improving the efficiency in the B28 frequency band. Figure 4 When the provided antenna assembly is in the scenario of closing the cover and holding it with the left hand, the palm contacts the high current segment 110 of the antenna assembly 100. The palm has a dielectric loading effect on the antenna assembly 100, which changes the equivalent dielectric constant around the radiator, resulting in a low deviation of the radiation efficiency peak, and thus making the efficiency peak located in the B28 frequency band.

[0092] See also Fig.13 , Fig.13 This is an embodiment of the present application Figure 4 The provided antenna assembly has S parameters, radiation efficiency, and total efficiency curves in the closed cover + free space and closed cover + right hand holding scenarios. Among them, curve a1 is Figure 4 The S parameters of the antenna assembly in closed cover + free space are provided. Curve b1 is Figure 4 The radiation efficiency curve of the antenna assembly in the closed cover + free space is provided. Curve c1 is Figure 4 The total efficiency curve of the antenna assembly in the closed cover + free space is provided. Curve a2 is Figure 4 The S parameters of the antenna assembly in the closed cover + right hand holding scenario are provided. Curve b2 is Figure 4 The radiation efficiency curve of the antenna assembly provided in the closed cover + right hand holding scenario. Curve c2 is Figure 4 The total efficiency curve of the antenna assembly in the closed lid + right-hand holding scenario is provided.

[0093] According to curve a1 and curve b1, Figure 4The provided antenna assembly supports the B28 frequency band in both the closed cover + free space and closed cover + right hand holding scenarios. According to curve a2 and curve b2, Figure 4 The efficiency of the provided antenna assembly in the closed cover + right-hand holding scenario is basically unchanged in the resonant bandwidth compared to the closed cover + free space scenario, the resonance becomes slightly deeper, and the efficiency changes little.

[0094] Figure 4 The distance between the first grounding end and the bottom edge is about 40 mm. Figure 5 The distance between the first grounding end and the bottom edge is about 20 mm. Figure 4 and Figure 5 The position of the first ground end of the first radiator 11 is different, which results in different efficiencies. Figure 5 The first grounding end is closer to the bottom edge, and the performance of the electronic device in a free scene is high. At the same time, the first grounding end is closer to the bottom edge, and the fingers are not easy to touch the first grounding end of the antenna component in the closed hand holding / bar holding scene, so the absorption of the radiation power of the antenna component by the fingers is reduced, and the performance of the electronic device in the hand holding scene will also be improved. Take the electronic device as a foldable electronic device as an example.

[0095] Please refer to Table 1-1, which is Figure 4 The distance between the first ground terminal and the bottom edge is about 40mm. Figure 5 The total efficiency of an electronic device with a distance of about 20 mm between the first ground terminal and the bottom edge when unfolding the free space, folding the free space, folding the left hand holding, folding the right hand holding, folding the left head hand (folding the left hand holding close to the head), and folding the right head hand (folding the right hand holding close to the head).

[0096] Table 1-1

[0097]

[0098] It can be seen that in the antenna assembly in which the distance between the first ground end and the bottom edge is about 20 mm, the efficiency from the folded free scenario to the folded left-hand holding scenario is improved from -11.4 dB to -9.4 dB, indicating that the dielectric loading in the antenna assembly in which the distance between the first ground end and the bottom edge is about 20 mm is relatively strong; although the efficiency after folding is lower than that when unfolded, the efficiency peak after dielectric loading is advanced to the vicinity of the resonance point, so the efficiency of the resonance point after dielectric loading is improved.

[0099] In the antenna assembly where the distance between the first ground end and the bottom edge is about 20 mm, the efficiency from the folded free scene to the folded right-hand holding scene increases from -11.4 dB to -11.3 dB, indicating that in the antenna assembly where the distance between the first ground end and the bottom edge is about 20 mm, the dielectric loading of the finger overlap is similar to the absorption of the finger overlap.

[0100] In the antenna assembly in which the distance between the first ground end and the bottom edge is about 40mm, the efficiency from the folded free scene to the folded left-hand holding scene is improved from -13dB to -8.6dB, indicating that the dielectric loading in the antenna assembly in which the distance between the first ground end and the bottom edge is about 40mm is relatively strong; although the efficiency after folding is lower than that when unfolded, the efficiency peak after dielectric loading is advanced to the vicinity of the resonance point, so the efficiency of the resonance point after dielectric loading is improved.

[0101] In the antenna assembly in which the distance between the first ground end and the bottom edge is about 40 mm, the efficiency from the folded free scene to the folded right-hand holding scene is improved from -13dB to -12.2dB, indicating that in the antenna assembly in which the distance between the first ground end and the bottom edge is about 40 mm, the dielectric loading of the finger overlap is similar to the absorption of the finger overlap, and the dielectric loading of the finger overlap is slightly greater than the absorption of the finger overlap.

[0102] The total efficiency of the electronic device with a distance of about 20 mm between the first ground terminal and the bottom edge in the unfolded free scene and the folded free scene is greater than the total efficiency of the electronic device with a distance of about 40 mm between the first ground terminal and the bottom edge in the unfolded free scene and the folded free scene. This shows that the electronic device with a distance of about 20 mm between the first ground terminal and the bottom edge has a stronger performance in the free scene.

[0103] See also Figure 4 and Figure 5 , the second radiator 22 is disposed at the bottom edge 322 . The electrical length of the second radiator 22 is smaller than the electrical length of the first radiator 11 .

[0104] The electrical length described in this application can satisfy the following formula:

[0105]

[0106] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in free space.

[0107] Optional, see Figure 5 , the first feeding point B and the first grounding terminal A are both located in the palm holding area Z1. Among them, the first feeding point B and the first grounding terminal A are both strong current points, so the vicinity of the first grounding terminal A is a strong current area, and the vicinity of the first feeding point B is a strong current area. By setting the strong current segment 110 in the palm holding area Z1 of the left hand, the palm forms a dielectric loading effect at the strong current segment 110, thereby improving the radiation efficiency of the left hand holding.

[0108] Optional, see Figure 5, the first feeding point B is located between the midpoint of the first radiator 11 and the first ground terminal A. In this way, the first radiator 11 and the first signal source 12 form an IFA antenna. The current mode of the first resonant mode is the IFA current mode. In the IFA current mode, the portion between the first ground terminal A and the first feeding point B is a high current segment. Furthermore, in the IFA current mode, the portion from the first ground terminal A to the position where 3 / 4 of the length of the first radiator 11 is located is a high current segment.

[0109] In this embodiment, the first feeding point B is designed to be close to the first ground terminal A. Both the first feeding point B and the first ground terminal A are located in the palm holding area Z1, so that the current mode of the first resonant mode is the IFA current mode, so as to form a longer strong current segment on the first radiator 11, so that more strong current segments are in contact with the left palm, the dielectric loading effect is greater, and the efficiency improvement effect is more obvious.

[0110] Optionally, the distance between the first ground terminal A and the bottom edge 322 is less than or equal to 20 mm. The distance between the first ground terminal A and the bottom edge 322 is relatively close, so that the first ground terminal A can avoid the finger overlap zone Z2 when holding with the right hand as much as possible, reducing the absorption effect when holding with the right hand, and is located in the palm holding zone Z1 when holding with the left hand, making full use of the medium loading effect when holding with the left hand to improve the efficiency in the left-hand holding scenario.

[0111] In addition, since the first ground terminal A and the first feeding point B are both located at the first side 323, and the distance between the first ground terminal A and the bottom 322 is less than or equal to 20 mm, the distance between the first ground terminal A and the first feeding point B is less than 20 mm. Since the first low frequency is a LB frequency band less than 900 MHz, that is, the first feeding point B is located between the midpoint of the first radiator 11 and the first ground terminal A. In this way, the first feeding point B is arranged at the first side 323, so that the antenna assembly 100 is an IFA antenna to form a longer strong current segment, and form more dielectric loading effects when held in the palm.

[0112] See also Fig.14, the electronic device 1000 is a foldable electronic device. The electronic device 1000 includes a first body 10 and a second body 20. The first body 10 and the second body 20 are movably connected (rotationally connected or slidably connected) to present a folded state or an unfolded state. The first body 10 includes a top edge 321. The second body 20 includes a bottom edge 322. When the electronic device 1000 is in the unfolded state, the top edge 321 and the bottom edge 322 are respectively located on opposite sides of the electronic device 1000. When the electronic device 1000 is in the folded state, the top edge 321 and the bottom edge 322 overlap in the thickness direction. In other words, the top edge 321, the first part of the first side edge 323, and the first part of the second side edge 324 are located in the first body 10. The bottom edge 322, the second part of the first side edge 323, and the second part of the second side edge 324 are located in the second body 20.

[0113] For the foldable electronic device 1000, the area of ​​the reference floor is halved after folding, which has a great impact on the efficiency, especially for the low frequency that relies on the radiation of the reference floor. The folding of the electronic device 1000 has a great impact on the efficiency of the low-frequency antenna. In the N28 frequency band, the maximum drop is close to 10dB.

[0114] It can be understood that the above is an example in which the antenna assembly 100 is arranged on the first side 323. Accordingly, the inventive concept of the antenna assembly 100 being arranged on the second side 324 is the same as the inventive concept of the antenna assembly 100 of the present application being arranged on the first side 323.

[0115] This application takes the first radiator 11 as an IFA antenna as an example to illustrate the following inventive concepts.

[0116] Optional, see Figure 3 , the antenna assembly 100 also includes a first matching circuit M1. The first matching circuit M1 is electrically connected between the first feeding point B and the first signal source 12. The first matching circuit M1 is used to adjust the impedance matching between the port of the first signal source 12 and the port of the first radiator 11. The first matching circuit M1 includes at least one of a capacitor and an inductor. Further, the first matching circuit M1 also includes a switch selection circuit, which is used to select devices (inductors and / or capacitors) with different impedances to work, so as to adjust the electrical length of the first radiator 11, thereby changing the aperture of the first radiator 11, adjusting the electrical length of the first radiator 11, and switching the first low-frequency sub-band. For example, switching from the B28 band to the B5 band, etc. Of course, the switch selection circuit can also be electrically connected to the position between the first feeding point B and the first free end D of the first radiator 11 alone.

[0117] In summary, the electronic device 1000 provided in the embodiment of the present application has designed the positions of the first free end D, the first feeding end, the strong current segment and the first grounding terminal A of the antenna component 100. Specifically, the first free end D of the antenna component 100 is arranged in the open area Z3 of the bottom edge 322 to prevent the hand from holding the first free end D in the holding scenario; the first feeding point B is arranged at a position relatively close to the first grounding terminal A to form an IFA antenna, which is more efficient in the closed scenario; the strong current segment is arranged in the palm holding area Z1 in the holding scenario, so that the palm can perform dielectric loading on the strong current segment on the antenna, and the dielectric loading is used to improve the radiation efficiency of the lower frequency band; the first grounding terminal A is arranged below the finger overlapping area Z2 to reduce the impact of the hand holding performance; the above design realizes the formation of dielectric loading by the palm in the left-hand holding scenario, thereby improving the performance, and the first grounding terminal A is away from the finger in the right-hand holding scenario, and the performance does not decrease or decreases slightly, so as to balance the holding performance of the left and right hands and form a low-frequency antenna that is resistant to folding and hand holding.

[0118] For foldable electronic devices, the reduction of the reference floor after folding and hand-held absorption lead to a significant decrease in efficiency in the mid- and high-frequency bands. The embodiment of the present application designs the positions of the ground end, free end and feeding point of the antenna assembly 100 to avoid hand-held absorption and facilitate dielectric loading to improve efficiency. Furthermore, a second radiator 22 is provided to form a radiation mode and a balanced mode of the EE mode, so as to further improve the radiation efficiency of the mid- and high-frequency antenna in the foldable electronic device after folding, thereby ensuring the stability of the closed-cover calling function of the foldable electronic device.

[0119] See also Fig.15 , the electrical length of the first radiator 11 is approximately 1 / 4 wavelength of the first low frequency. The first resonant mode forms a 1 / 4 wavelength mode that supports the first low frequency between the first ground terminal A and the first free end D. Optionally, the resonant current of the first resonant mode flows from the first free end D to the first ground terminal A, or from the first ground terminal A to the first free end D. The current mode of the resonant current of the first resonant mode is a 1 / 4 wavelength mode. In this embodiment, the first radiator 11 is an IFA antenna. The 1 / 4 wavelength mode is the ground mode of the IFA antenna. At this time, the antenna assembly 100 has a higher radiation efficiency at the first low frequency. Therefore, the first ground terminal A and the first feeding point B of the resonant current of the first resonant mode are both current strong points, and the first free end D is a current weak point.

[0120] See also Fig.16 In the ring mode, the current intensity in the path from the second ground terminal G through the second radiator 22 to the first connection point F and then through the capacitive tuning circuit 40 is uniform and all are relatively strong currents, without obvious difference between strong and weak currents.

[0121] Optionally, the electrical length of the second radiator 22 is less than 1 / 4 wavelength of the second low frequency and greater than 1 / 16 wavelength of the second low frequency.

[0122] Generally, if the second radiator 22 generates intrinsic resonance under the excitation of the first signal source 12, the electrical length of the second radiator 22 needs to be close to 1 / 4 wavelength of the second low frequency. In this embodiment, the electrical length of the second radiator 22 is less than 1 / 4 wavelength of the second low frequency, and the second radiator 22 does not generate the intrinsic resonance mode of the second radiator 22. Instead, the second radiator 22 is equivalent to an inductor and is equivalent to an equivalent LC resonant circuit with the capacitive tuning circuit 40. When the equivalent inductance is determined, the capacitive tuning circuit 40 tunes the resonant frequency of the equivalent LC resonant circuit to a low frequency, which is recorded as the second low frequency.

[0123] Generally, the size of the low-frequency antenna is relatively long. If both the first radiator 11 and the second radiator 22 generate intrinsic resonance to support the low-frequency dual waves, the size of the antenna component will be relatively large, for example, 160mm-200mm. Other medium- and high-frequency antennas, Wi-Fi antennas, GPS antennas, etc. need to be set on the frame of the electronic device, so the frame of the electronic device cannot provide 160mm-200mm of space for the dual low-frequency antennas. For this reason, the present application can not only realize the dual low-frequency antennas, but also reduce the space occupied by the dual low-frequency antennas.

[0124] The second radiator 22 is an equivalent inductor for the resonant current of the annular mode. The capacitive tuning circuit 40 and the second radiator 22 are an equivalent LC circuit for the resonant current of the annular mode. The resonant frequency of the equivalent LC circuit is the center frequency of the second low frequency.

[0125] Furthermore, the length of the second radiator 22 is close to 1 / 8 wavelength of the second low frequency. Optionally, the length of the second radiator 22 is 20mm±5mm. If the length of the second radiator 22 is less than 15mm, it is too far from the physical resonant length (1 / 4 wavelength) of the second radiator 22. At this time, from the perspective of the S parameters of the annular mode, the annular mode is weak, and the contribution of the annular mode to the first resonant mode is small, and the effect of improving the efficiency of the first low frequency is small. The present application designs the length of the second radiator 22 to be close to 1 / 8 wavelength of the second low frequency, thereby achieving extremely short low-frequency parasitic branches and forming a low-frequency double wave. The annular mode is integrated with the first resonant mode to improve the radiation efficiency of the first resonant mode, thereby improving the low-frequency efficiency while reducing the size occupied by the antenna assembly 100.

[0126] See also Fig.16, the first connection point F is located at the second free end E. The resonant current of the ring mode flows through the entire second radiator 22, and the entire length of the second radiator 22 is equivalent to an inductor. While satisfying the miniaturization of the size of the second radiator 22, a ring current mode is formed to support the second low frequency. The ring current mode improves the efficiency of the first resonant mode, thereby improving the efficiency and bandwidth of the low frequency.

[0127] The difference between the first resonant mode and the annular mode includes: the first resonant mode is an intrinsic resonant mode in which the electrical length of the first radiator 11 satisfies the 1 / 4 wavelength of the first low frequency. The annular mode is a resonant mode in which the electrical length of the second radiator 22 is much smaller than the 1 / 4 wavelength mode of the second low frequency, the second radiator 22 is equivalent to an inductor, and the second radiator 22 and the capacitive tuning circuit 40 form an equivalent LC resonant circuit. The annular mode is not an intrinsic resonant mode of the second radiator 22.

[0128] Optionally, the second connection point C is located in a relatively weak current segment in the resonance current of the first resonance mode of the first radiator 11. If the switch tuning circuit 50 is electrically connected to a strong current segment (electric wall position) in the resonance current of the first resonance mode of the first radiator 11, the first low-frequency sub-band supported by the first resonance mode cannot be effectively tuned.

[0129] Optionally, the second connection point C is located at the bottom edge 322 .

[0130] Optionally, the distance between the first feeding point B and the first free end D is less than 1 / 4 wavelength of the B8 frequency band, so that the switch tuning circuit 50 covers the B8 frequency band or a lower frequency band higher than B8 during the tuning process to meet actual needs.

[0131] See also Fig.17 , Fig.17 yes Figure 4 The S parameter curve and efficiency curve of the antenna assembly 100 are provided. Curve a is Figure 4 The S parameter curve of the antenna assembly 100 is provided. Curve b is Figure 4 The radiation efficiency curve of the antenna assembly 100 is provided. Curve c is Figure 4 An overall efficiency curve of the antenna assembly 100 is provided.

[0132] In curve a, mode 1 is the first resonant mode and mode 2 is the ring mode. From curve b and curve c, it can be seen that mode 1 has better efficiency. From curve a, it can be seen that mode 1 and mode 2 are fused to form a dual wave to improve the efficiency of mode 1, and a wide frequency band is covered in terms of bandwidth. The first low frequency and the second low frequency form a continuous frequency band.

[0133] Since mode 2 is a ring mode, which is different from the EE (electric field-electric field) mode, the resonance principle of the ring mode is that the second radiator 22 is equivalent to an inductor, and the capacitive tuning circuit 40 is a capacitor grounded, and at this time, the resonance point of the equivalent LC resonant circuit is formed, that is, the resonance position of mode 2. The resonance of mode 2 is determined by its own equivalent inductance and grounded capacitance, so mode 2 and mode 1 are relatively independent, that is, adjusting the resonance point of mode 2 requires changing the grounded capacitance value of the capacitive tuning circuit 40, and adjusting mode 1 is to switch the grounded inductance value through the switch in the switch tuning circuit 50, so mode 1 and mode 2 can not only achieve dual-wave fusion, but also dual-wave dual-cutting, and have no influence on each other.

[0134] By setting the resonant frequency of the first radiator 11 and the resonant frequency of the equivalent LC resonant circuit formed by the second radiator 22 and the capacitive tuning circuit 40 to be located at a similar position, the first low frequency and the second low frequency form a continuous frequency band. In this way, the first resonant mode and the annular mode form a double wave with good fusion, and the annular mode has a more obvious improvement effect on the first resonant mode, and the low-frequency bandwidth is increased, reducing the influence of hand-held frequency deviation and the like.

[0135] See also Fig.18 , the distance between the first connection point F and the second free end E is small. Among them, the second free end E is very close to the first connection point F, and it is easier to excite a ring mode with good efficiency. For the equivalent LC resonant circuit, the part between the first connection point F and the second ground terminal G is equivalent to inductance, and the part between the first connection point F and the second free end E is equivalent to capacitance. When the distance between the first connection point F and the second free end E is longer, the capacitance between the first connection point F and the second free end E has a greater impact on the equivalent LC resonant circuit, and it is necessary to use traditional inductance to tune the low frequency, and it is not easy to form a ring mode.

[0136] The present application does not specifically limit the distance between the first connection point F and the second free end E. Optionally, in this embodiment, the distance between the first connection point F and the second free end E is less than or equal to 1 / 5 of the length of the second radiator 22, and while satisfying the annular mode, the position of the first grounding point and the position of the capacitive tuning circuit 40 can be relatively flexibly set, with the characteristics of low-frequency dual-wave independence and low-frequency dual-wave fusion.

[0137] See also Fig.19 , the electrical length of the second radiator 22 is less than 1 / 4 wavelength of the second low frequency and greater than or equal to 1 / 8 wavelength of the second low frequency.

[0138] The second grounding end G is located at the second side, and the distance between the second grounding end G and the bottom edge 322 is less than or equal to 20 mm.

[0139] Compared with the antenna assembly 100 in which the second ground end G is located at the bottom edge 322, the length of the second radiator 22 in this embodiment is longer and closer to the electrical length of the second radiator 22 generating the intrinsic resonant mode, thereby supporting a higher efficiency of the second low frequency.

[0140] In this embodiment, the length of the second radiator 22 is increased so that the physical length of the second radiator 22 is closer to the equivalent electrical length required for the second low-frequency resonance, thereby further improving the low-frequency dual-wave performance.

[0141] See also Fig. 20 , Fig. 20 The S parameters and efficiency curves of the antenna assembly 100 provided in the embodiments of the present application, in which the second connection point C is located at the second free end E, and the antenna assembly 100 in which the distance between the second connection point C and the second free end E is 3 mm. Curve a1 is the S parameter curve of the antenna assembly 100 in which the second connection point C is located at the second free end E. Curve b1 is the radiation efficiency curve of the antenna assembly 100 in which the second connection point C is located at the second free end E. Curve c1 is the total efficiency curve in which the distance between the second connection point C and the second free end E is 3 mm. Curve a2 is the S parameter curve in which the distance between the second connection point C and the second free end E is 3 mm. Curve b2 is the radiation efficiency curve in which the distance between the second connection point C and the second free end E is 3 mm. Curve c2 is the total efficiency curve in which the distance between the second connection point C and the second free end E is 3 mm.

[0142] It can be seen from curves a1 and b1 that the antenna assembly 100 with a distance of 3 mm between the second connection point C and the second free end E can also realize low-frequency dual-wave to form a continuous frequency band, and can still realize dual-wave dual-cutting independently of each other.

[0143] See also Fig.21 , Fig.21 This is an efficiency comparison diagram when the second radiator 22 is not set, when the length of the second radiator 22 is set to be close to 1 / 8 wavelength of the second low frequency and the capacitive tuning circuit 40 is a 2pF capacitor, when the length of the second radiator 22 is set to be close to 1 / 8 wavelength of the second low frequency and the capacitive tuning circuit 40 is a 2.5pF capacitor, and when the length of the second radiator 22 is set to be greater than 1 / 8 wavelength and less than 1 / 4 wavelength of the second low frequency.

[0144] Curve a1 is the radiation efficiency when the length of the second radiator 22 is set to be greater than 1 / 8 wavelength and less than 1 / 4 wavelength of the second low frequency. Curve b1 is the radiation efficiency when the length of the second radiator 22 is set to be close to 1 / 8 wavelength of the second low frequency and the capacitance of the capacitive tuning circuit 40 is 2pF. Curve c1 is the radiation efficiency when the length of the second radiator 22 is set to be close to 1 / 8 wavelength of the second low frequency and the capacitance of the capacitive tuning circuit 40 is 2.5pF. Curve d1 is the radiation efficiency when the second radiator 22 is not set.

[0145] Curve a2 is the total efficiency when the length of the second radiator 22 is set to be greater than 1 / 8 wavelength and less than 1 / 4 wavelength of the second low frequency. Curve b2 is the total efficiency when the length of the second radiator 22 is set to be close to 1 / 8 wavelength of the second low frequency and the capacitive tuning circuit 40 is a 2pF capacitor. Curve c2 is the total efficiency when the length of the second radiator 22 is set to be close to 1 / 8 wavelength of the second low frequency and the capacitive tuning circuit 40 is a 2.5pF capacitor. Curve d2 is the total efficiency when the second radiator 22 is not set.

[0146] By comparing the efficiency curves b1 and c1, it can be seen that when the capacitor of the capacitive tuning circuit 40 is switched, only the frequency of the ring mode changes, and the efficiency of the first resonant mode does not change. This also shows that at this time, the dual waves are double-cut and there is no mutual influence (no mutual influence means that when one mode is switched, the other mode does not move, and the two modes are independent). By comparing the curves a1 and c1, it can be seen that increasing the length of the second radiator 22 will further improve the efficiency, and the pit of the radiation efficiency will be shallower. By comparing the curves d1 and a1, b1, and c1, it can be seen that whether a relatively long second radiator 22 or a relatively short second radiator 22 is set, the efficiency of the first resonant mode will be greatly improved, and the low-frequency dual waves are efficient. The efficiency of the second radiator 22 can be used as a supplement to the efficiency of the first radiator 11.

[0147] See also Fig. 22 , Fig. 22 yes Figure 5 The provided antenna assembly 100 has S parameter curves in the right hand closed, the right head hand closed, the free closed, the left hand closed, the left head hand closed, and the free unfolded state.

[0148] Curve a is Figure 5 The S parameter curve of the antenna assembly 100 in the right hand of the cover is provided. Curve b is Figure 5 The S parameter curve of the antenna assembly 100 in the right hand of the closed cover is provided. Curve c is Figure 5 The antenna assembly 100 is provided with a free S parameter curve in the closed state. Curve d is Figure 5 The S parameter curve of the antenna assembly 100 in the closed left hand is provided. Curve e is Figure 5 The S parameter curve of the antenna assembly 100 in the closed left hand is provided. Curve f is Figure 5 The antenna assembly 100 is provided in the form of a free S-parameter curve.

[0149] From the above curve, we can see that Figure 5 The provided antenna assembly 100 realizes low-frequency dual waves when covering the right hand, covering the right head hand, covering freely, covering the left hand, covering the left head hand, and unfolding freely, and the low-frequency dual waves form a continuous frequency band.

[0150] See also Fig.23 , Fig.23 yes Figure 5 The provided antenna assembly 100 has efficiency curves when the right hand is closed, the right head hand is closed, the cover is free, the left hand is closed, the left head hand is closed, and the cover is free.

[0151] Curve a1 is Figure 5 The radiation efficiency curve of the antenna assembly 100 in the right hand of the cover is provided. Curve b1 is Figure 5 The radiation efficiency curve of the antenna assembly 100 provided in the right hand of the cover is shown in FIG. Figure 5 The antenna assembly 100 is provided with a free radiation efficiency curve when the cover is closed. Curve d1 is Figure 5 The radiation efficiency curve of the antenna assembly 100 in the closed left hand is provided. Curve e1 is Figure 5 The radiation efficiency curve of the antenna assembly 100 provided in the closed left hand. Curve f1 is Figure 5 The antenna assembly 100 is provided in a free-form radiation efficiency curve.

[0152] Curve a2 is Figure 5 The total efficiency curve of the antenna assembly 100 in the right hand position is provided. Curve b2 is Figure 5 The total efficiency curve of the antenna assembly 100 in the right hand with the cover closed is provided. Curve c2 is Figure 5 The total efficiency curve of the antenna assembly 100 in the closed cover is provided. Curve d2 is Figure 5 The total efficiency curve of the antenna assembly 100 in the closed left hand is provided. Curve e2 is Figure 5 The total efficiency curve of the antenna assembly 100 in the closed left hand is provided. Curve f2 is Figure 5 The antenna assembly 100 is provided in an unrolled overall efficiency curve.

[0153] Please refer to Table 1-2, which is Figure 5 The provided antenna assembly 100 has the efficiency of being closed for the right hand, closed for the right head hand, closed freely, closed for the left hand, closed for the left head hand, and unfolded freely.

[0154] Table 1-2

[0155]

[0156] Figure 5 The first ground terminal A of the provided antenna assembly 100 is closer to the bottom edge 322, and the finger absorbs less when the right hand is held, and the medium recording is similar to the power absorbed by the finger. When the left hand is held, there is dielectric loading, and the dielectric loading effect is greater than the absorption effect, so both left-hand and right-hand holding scenarios are taken into account, and the annular mode is excited deeper, and the annular mode brings better performance improvement on the main mode.

[0157] When the first body 10 and the second body 20 are in the unfolded state, the radiation efficiency of the antenna assembly 100 in a free space scenario is a first radiation efficiency. When the first body 10 and the second body 20 are in the folded state, the radiation efficiency of the antenna assembly 100 in a free space scenario is a second radiation efficiency. The first radiation efficiency is greater than the second radiation efficiency, and the difference between the first radiation efficiency (-6.2dB) and the second radiation efficiency (-10.4dB) is less than or equal to 4.5dB.

[0158] In other words, the radiation efficiency of the antenna assembly 100 in a free scene when folded is relatively close to the radiation efficiency in a free scene when unfolded, and the antenna assembly 100 has a relatively high efficiency even in the folded scene.

[0159] When the first body 10 and the second body 20 are in the folded state, the efficiency of the antenna assembly 100 when held in the left hand (-8.4dB) is greater than the efficiency (-10.4dB) in the free space scenario when the first body 10 and the second body 20 are in the folded state. The antenna assembly 100 provided in the embodiment of the present application has dielectric loading when held in the left hand, and the dielectric loading effect is greater than the absorption effect, so the efficiency in the folded left hand holding scenario is relatively good.

[0160] When the first body 10 and the second body 20 are in the folded state, the efficiency (-10.4dB) of the antenna assembly 100 when held in the right hand is greater than or equal to the efficiency (-10.4dB) in the free space scenario when the first body 10 and the second body 20 are in the folded state. The antenna assembly 100 provided in the embodiment of the present application has dielectric loading and absorption effects when held in the right hand, and the dielectric loading effect is greater than or equal to the absorption effect, so the efficiency in the folded right-hand holding scenario is relatively high.

[0161] The efficiency of the antenna assembly 100 when held close to the head by the left hand in the folded state is greater than or equal to the efficiency in the free space scenario in the folded state. Further, the efficiency of the antenna assembly 100 when held close to the head by the left hand in the folded state (-10.4dB) is equal to the efficiency in the free space scenario in the folded state (-10.4dB). This indicates that the antenna assembly 100 has a relatively high efficiency when held close to the head by the left hand in the folded state.

[0162] The difference between the efficiency of the antenna assembly 100 in the folded state when held close to the head by the right hand and the efficiency in the free space scenario in the folded state is less than or equal to 3 dB, indicating that the antenna assembly 100 has a relatively high efficiency when held close to the head by the right hand in the folded state.

[0163] The difference between the efficiency of the antenna assembly 100 when held close to the head in the right hand (-13.4dB) in the folded state and the efficiency of the antenna assembly 100 when held close to the head in the left hand (-10.4dB) when the first body 10 and the second body 20 are in the folded state is less than or equal to 3dB. Therefore, the efficiency of the antenna assembly 100 when held close to the head in the right hand is similar to that of the antenna assembly 100 when held close to the head in the left hand. When the antenna assembly 100 is used, the signal quality of the left hand is less different from that of the right hand, and is more balanced.

[0164] The electronic device 1000 provided in the present application has further greatly improved performance in the head-and-hand closure scenario, and the head-and-hand closure scenario is the head-and-hand closure scenario. As the secondary screen of foldable mobile phones becomes larger and larger, users will tend to make calls in the head-and-hand closure scenario. The electronic device 1000 provided in the present application can improve the user experience.

[0165] Optional, see Fig.24 The first grounding end A and the second grounding end G are directly opposite to each other along the extension direction of the top edge to form a transverse current, thereby improving the anti-folding performance.

[0166] For details, please refer to Fig.25 , the first side edge 323, the bottom edge 322 and the second side edge 324 are all arranged at intervals along the edge of the reference floor 500. The current of the first resonant mode and the current of the ring mode form a target floor current on the reference floor 500. The target floor current is mainly distributed along the extension direction of the bottom edge 322. In other words, the target floor current is a transverse current I3.

[0167] The first ground terminal A of a general low-frequency antenna is located at a side and relatively far from the bottom edge 322. The low-frequency antenna excites a transverse current mode and a longitudinal current mode on the reference floor 500. At this time, the radiation dependence of the low-frequency antenna on the reference floor 500 is relatively large. When the electronic device 1000 is folded, the area of ​​the reference floor 500 is halved, resulting in a relatively large low-frequency signal loss when folded.

[0168] In the antenna assembly 100 of the present application, when the first ground terminal A and the second ground terminal G are opposite and flush, the first radiator 11 and the second radiator 22 are self-resonant structures, and the modes on the first radiator 11 and the second radiator 22 are electric field coupling. The first radiator 11 and the second radiator 22 are less dependent on the current of the reference floor 500, and the current goes down to the ground from the first ground terminal A and the second ground terminal G respectively. The first ground terminal A and the second ground terminal G are opposite to each other, and a transverse current on the reference floor 500 is formed between the first ground terminal A and the second ground terminal G. The longitudinal length has a low influence on the transverse current, so after the reference floor 500 is folded, the influence on the transverse current is small. Furthermore, the folding of the reference floor 500 has little or no influence on the signal strength of the antenna assembly 100 at low frequencies, thereby improving the anti-folding performance of the present application.

[0169] In addition, since the first ground terminal A of the first radiator 11 is close to the bottom edge 322, the second ground terminal G is also close to the bottom edge 322. The first radiator 11 forms a transverse current on the reference floor 500, and the second radiator 22 forms a transverse current on the reference floor 500. The coupling of the first radiator 11 to the second radiator 22, the current on the reference floor 500 is also transverse, so the wave of the first resonance mode formed by the first radiator 11 and the wave of the ring mode formed by the second radiator 22 are well integrated, and the ring mode contributes greatly to the efficiency improvement of the first resonance mode.

[0170] In the electronic device 1000 provided in the present application, the first ground end A of the first radiator 11 is close to the bottom edge 322, and the second radiator 22 in an annular mode is introduced, thereby ensuring the independence of the first resonant mode and the annular mode, realizing the requirements of LB+LB and dual-wave and dual-cut being independent of each other, improving the hand-holding performance and reducing the drop in hand-holding when the cover is closed.

[0171] See also Fig.26 The second radiator 22 further includes a third connection point N. The third connection point N is located between the first connection point F and the second ground terminal G.

[0172] See also Fig.26The antenna assembly 100 further includes a third switch unit K2 and a fourth switch unit K3. One end of the third switch unit K2 is electrically connected to the third connection point N. The other end of the third switch unit K2 is grounded. One end of the fourth switch unit K3 is electrically connected to the second grounding end G. The other end of the fourth switch unit K3 is grounded.

[0173] The antenna assembly 100 has a first working state and a second working state. The first working state is that the third switch unit K2 is disconnected and the third antenna unit is turned on. The second working state is that the fourth switch unit K3 is disconnected and the second antenna unit is turned on, or the fourth switch unit K3 is turned on and the second antenna unit is turned on.

[0174] Optionally, the total length of the second radiator 22 is close to and less than 1 / 4 wavelength of the second low frequency.

[0175] Optionally, the third connection point N is located near 1 / 8 wavelength of the second low frequency, so that the antenna assembly 100 can be switched to a short second radiator 22, for example, a second radiator 22 with a length of approximately 1 / 8 wavelength of the second low frequency; it can also be switched to a long second radiator 22, for example, a second radiator 22 with a length close to and less than 1 / 4 wavelength of the second low frequency.

[0176] The electronic device 1000 further includes a controller (not shown). When the electronic device 1000 is in the folded state, the controller switches the first working state or the second working state according to the signal strength working at the first low frequency.

[0177] Specifically, when the signal strength at the first low frequency is high when the antenna component 100 is in the first working state, the antenna component 100 is controlled to switch to the first working state; when the signal strength at the first low frequency is high when the antenna component 100 is in the second working state, the antenna component 100 is controlled to switch to the second working state.

[0178] Alternatively, when the signal strength of the antenna component 100 working at the first low frequency in the first working state is greater than or equal to a preset strength threshold, the antenna component 100 is controlled to switch to the first working state; when the signal strength of the antenna component 100 working at the first low frequency in the second working state is greater than or equal to a preset strength threshold, the antenna component 100 is controlled to switch to the second working state.

[0179] Of course, the antenna assembly 100 may further include more switch units, which are electrically connected to different positions on the second radiator 22, so as to switch the second radiator 22 to different lengths, thereby switching the antenna assembly 100 to different antenna structures.

[0180] See also Fig. 27 The antenna assembly 100 further includes a third radiator 33 and a third signal source 31. The second matching circuit M2 is electrically connected between the third radiator 33 and the third signal source 31. The third radiator 33 is disposed at the top edge 321. The third radiator 33 includes a third free end H, a third feeding point J and a third grounding end K which are sequentially arranged. The third signal source 31 is electrically connected to the third feeding point J to excite the third radiator 33 to generate a second resonant mode supporting the first frequency band.

[0181] The third radiator 33 and the third signal source 31 form an IFA antenna, and the electrical length between the third ground terminal K and the third free end H is close to 1 / 4 wavelength of the first frequency band. When the electronic device 1000 is in the unfolded state, the third resonant mode forms a 1 / 4 wavelength mode supporting the first frequency band between the third ground terminal K and the third free end H.

[0182] See also Fig.28 When the electronic device 1000 is in a folded state, the direction in which the third ground terminal K points to the third free terminal H is opposite to the direction in which the second ground terminal G points to the second free terminal E. In the thickness direction of the electronic device 1000, the third radiator 33 is opposite to and coupled with at least a portion of the second radiator 22. The first frequency band includes a GPS frequency band, etc.

[0183] Optionally, the length between the second ground end G and the second free end E is smaller than the length of the third radiator 33 .

[0184] Specifically, when the electronic device 1000 is in a folded state, the direction in which the third ground terminal K points to the third free end H is opposite to the direction in which the second ground terminal G points to the second free end E. In the thickness direction of the electronic device 1000. The third radiator 33 is opposite to and coupled with at least a portion of the second radiator 22. Further, the orthographic projection of the third ground terminal K on the second radiator 22 is located between the second ground terminal G and the second free end E, and the orthographic projection of the second free end E on the third radiator 33 is located between the third ground terminal K and the third free end H. Optionally, the relative length between the second radiator 22 and the third radiator 33 is close to half the length of the second radiator 22. Further, the relative length between the second radiator 22 and the third radiator 33 is (1 / 2-1) times the length of the second radiator 22.

[0185] Specifically, when the electronic device 1000 is in the folded state, the third resonance mode includes a first sub-mode and a second sub-mode. The first sub-mode and the second sub-mode have different resonant current distributions. The first sub-mode and the second sub-mode exist at the same time, and the first sub-mode and the second sub-mode each form a resonance to form a dual-wave resonance. That is, the first sub-mode and the second sub-mode are dual-wave resonances that support the first frequency band.

[0186] See also Fig.29 , the first sub-mode forms a first sub-current Q1 between the third ground terminal K and the third free terminal H, and forms a second sub-current Q2 between the second free terminal E and the second ground terminal G. The current intensity of the first sub-current Q1 is greater than the current intensity of the second sub-current Q2. The current direction of the first sub-current Q1 is the same as the current direction of the second sub-current Q2. For example, the first sub-current Q1 flows from the third ground terminal K to the third free terminal H, and the second sub-current Q2 flows from the second free terminal E to the second ground terminal G. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0187] The first sub-mode forms a 1 / 4 wavelength mode supporting the first sub-frequency band between the third ground end K and the third free end H.

[0188] Specifically, in the first sub-mode, the resonant current on the third ground terminal K and the third free end H is the part that mainly contributes to the radiation energy. The electrical length between the third ground terminal K and the third free end H is about 1 / 4 wavelength of the first sub-band, and the resonant current on the third ground terminal K and the third free end H works in the 1 / 4 wavelength mode of the first sub-band.

[0189] See also Fig.30 , the second sub-mode forms a third sub-current Q3 between the second free end E and the second ground end G, and forms a fourth sub-current Q4 between the third ground end K and the third free end H. The current intensity of the fourth sub-current Q4 is greater than the current intensity of the third sub-current Q3. The current direction of the fourth sub-current Q4 is opposite to the current direction of the third sub-current Q3. For example, the third sub-current Q3 flows from the third ground end K to the third free end H, and the fourth sub-current Q4 flows from the second ground end G to the second free end E. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0190] The second sub-mode forms a 1 / 4 wavelength mode supporting the second sub-frequency band between the second ground end G and the second free end E.

[0191] Specifically, in the second sub-mode, the resonant current on the second ground terminal G and the second free end E is the part that mainly contributes to the radiation energy. The electrical length between the second ground terminal G and the second free end E is about 1 / 4 wavelength of the second sub-frequency band, and the resonant current on the second ground terminal G and the second free end E works in the 1 / 4 wavelength mode of the second sub-frequency band.

[0192] The electrical length between the second ground terminal G and the second free end E is smaller than the electrical length between the third ground terminal K and the third free end H. The center frequency of the second sub-frequency band is greater than the center frequency of the first sub-frequency band. The second sub-frequency band is continuous with the first sub-frequency band and forms the first frequency band. For example, the high-frequency side band of the second sub-frequency band overlaps at least partially with the low-frequency side band of the first sub-frequency band to form a continuous frequency band. The continuous frequency band covers the first frequency band. For example, the first frequency band is the GPS-L1 frequency band (1575MHz), the first sub-frequency band is 1500-1600MHz, and the second sub-frequency band is 1550-1650MHz. This data is for example only.

[0193] Optionally, a difference between a center frequency of the second sub-frequency band and a center frequency of the first sub-frequency band is less than or equal to 1 GHz.

[0194] The present application sets the second radiator 22 as a parasitic radiator of the third radiator 33, and the second sub-mode forms a double-wave resonance with the first sub-mode, wherein the first sub-mode can improve the in-band efficiency and efficiency bandwidth of the second sub-mode. In this way, the antenna assembly 100 can support the GPS band + LB band, improve the efficiency of the LB band and the GPS band when folded, and realize the functions of closing the cover for calls and closing the cover for navigation when the electronic device 1000 is folded. The reuse of the second radiator 22 increases the function of the antenna assembly 100 while reducing the space occupied by the antenna assembly 100.

[0195] Optionally, the length between the second ground terminal G and the second free end E is greater than the length of the third radiator 33. And the distance between the third connection point N and the second free end E is less than the length of the third radiator 33. When the third radiator 33 is working, the controller controls the antenna assembly 100 to work in the second working state, the fourth switch unit K3 is disconnected and the third switch unit K2 is turned on, or the fourth switch unit K3 is turned on and the third switch unit K2 is turned on, so that the second radiator 22 between the third connection point N and the second free end E can be coupled with the third radiator 33.

[0196] 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: The electronic device includes an antenna assembly, the antenna assembly including: A first radiator, the first radiator comprising a first free end, a first feeding point and a first grounding end which are arranged in sequence; a second radiator, the second radiator comprising a second ground end and a second free end disposed opposite to each other, a coupling gap being formed between the second free end and the first free end, the second radiator further comprising a first connection point, the first connection point being located at the second free end or disposed adjacent to the second free end; a capacitive tuning circuit, one end of the capacitive tuning circuit being electrically connected to the first connection point, and the other end of the capacitive tuning circuit being grounded; and a first signal source, the first signal source being electrically connected to the first feeding point to excite the first radiator to form a first resonant mode supporting a first low frequency; The first signal source also excites the second radiator and the capacitive tuning circuit to form a ring mode supporting a second low frequency. The resonant current of the ring mode flows from the first ground terminal, the second radiator, through the first connection point, and the capacitive tuning circuit to the ground. The first low frequency and the second low frequency form a continuous frequency band, and the sub-band switching of the first low frequency and the sub-band switching of the second low frequency are independent of each other.

2. The electronic device according to claim 1, wherein: The first radiator further includes a second connection point, the second connection point being located at the first feeding point or between the first feeding point and the first free end; The antenna assembly further includes a switch tuning circuit, one end of the switch tuning circuit is electrically connected to the second connection point, the other end of the switch tuning circuit is grounded, and the switch tuning circuit is used to switch the first low-frequency sub-band; The capacitive tuning circuit is used for switching the sub-frequency band of the second low frequency.

3. The electronic device according to claim 1, wherein: The capacitive tuning circuit includes a first switching unit and at least one capacitor element, the first switching unit electrically connects the first connection point and at least one capacitor element, and the first switching unit is used to switch the first connection point and any one or more capacitor elements to conduct, so as to switch the second low-frequency sub-band supported by the ring mode.

4. The electronic device according to claim 3, characterized in that: The capacitance value of the capacitive element is less than or equal to 10 pF.

5. The electronic device according to claim 2, characterized in that: The switch tuning circuit includes a second switch unit and multiple impedance tuning branches, the impedance tuning branch includes an inductor, the second switch unit electrically connects the second connection point with the multiple impedance tuning branches, and the second switch unit is used to switch the second connection point and any one or more impedance tuning branches to switch the first low-frequency sub-band.

6. The electronic device according to claim 1, wherein: The first resonant mode forms a 1 / 4 wavelength mode supporting the first low frequency between the first ground end and the first free end; the electrical length of the second radiator is less than 1 / 4 wavelength of the second low frequency and greater than 1 / 16 wavelength of the second low frequency.

7. The electronic device according to claim 6, characterized in that: The length of the second radiator is 20 mm±5 mm.

8. The electronic device according to claim 1, wherein: The distance between the first connection point and the second free end is less than or equal to 1 / 5 of the length of the second radiator.

9. The electronic device according to claim 1, wherein: The second radiator is an equivalent inductor for the resonant current of the annular mode, the capacitive tuning circuit and the second radiator are an equivalent LC circuit for the resonant current of the annular mode, and the resonant frequency of the equivalent LC circuit is the center frequency of the second low frequency.

10. The electronic device according to claim 1, wherein: The distance between the first feeding point and the first free end is less than 1 / 4 wavelength of the B8 frequency band.

11. The electronic device according to claim 1, wherein: The electronic device also includes a frame, which includes a top edge, a first side edge, a bottom edge and a second side edge connected in sequence; the first side edge includes a finger overlapping area and a palm holding area, and the finger overlapping area is located on the side of the palm holding area away from the bottom edge; the first free end is located at the bottom edge, the first grounding end is located at the first side edge, and the first grounding end is located between the finger overlapping area and the bottom edge on the first side edge, and at least part of the high current segment of the first radiator in the first resonance mode is arranged in the palm holding area to form dielectric loading under palm holding.

12. The electronic device according to any one of claims 1 to 11, characterized in that: The first feeding point and the first grounding end are both located in the palm holding area.

13. The electronic device according to any one of claims 1 to 11, characterized in that: The distance between the first grounding end and the bottom edge is less than or equal to 20 mm.

14. The electronic device according to any one of claims 1 to 11, characterized in that: The efficiency of the high current segment of the first radiator after dielectric loading is greater than the efficiency of the high current segment of the first radiator without dielectric loading.

15. The electronic device according to any one of claims 1 to 11, characterized in that: The electronic device is a foldable electronic device, comprising a first body and a second body, wherein the first body is movably connected to the second body to present a folded state or an unfolded state; the top edge, the first part of the first side edge, and the first part of the second side edge are located in the first body, and the bottom edge, the second part of the first side edge, and the second part of the second side edge are located in the second body.

16. The electronic device according to claim 15, characterized in that: The electrical length of the second radiator is less than 1 / 4 wavelength of the second low frequency and greater than or equal to 1 / 8 wavelength of the second low frequency; The second grounding end is located at the second side edge, and a distance between the second grounding end and the bottom edge is less than or equal to 20 mm.

17. The electronic device according to claim 16, characterized in that: The first grounding end and the second grounding end are directly opposite to each other along the extending direction of the top edge.

18. The electronic device according to claim 17, characterized in that: The electronic device also includes a reference floor, the first side, the bottom and the second side are all arranged at intervals along the edge of the reference floor, the current of the first resonant mode and the current of the ring mode form a target floor current on the reference floor, and the target floor current is mainly distributed along the extension direction of the bottom.

19. The electronic device according to claim 15, characterized in that: When the first body and the second body are in the unfolded state, the radiation efficiency of the antenna assembly in a free space scenario is a first radiation efficiency, and when the first body and the second body are in the folded state, the radiation efficiency of the antenna assembly in a free space scenario is a second radiation efficiency, the first radiation efficiency is greater than the second radiation efficiency, and the difference between the first radiation efficiency and the second radiation efficiency is less than or equal to 4.5dB.

20. The electronic device according to claim 15, characterized in that: When the first body and the second body are in the folded state, the efficiency of the antenna assembly when held in the left hand is greater than the efficiency when the first body and the second body are in the folded state in a free space scenario; when the first body and the second body are in the folded state, the efficiency of the antenna assembly when held in the right hand is greater than or equal to the efficiency when the first body and the second body are in the folded state in a free space scenario.

21. The electronic device according to claim 15, characterized in that: In the folded state, the efficiency of the antenna assembly when held in the left hand close to the head is greater than or equal to the efficiency in the folded state in the free space scenario, and the difference between the efficiency of the antenna assembly when held in the right hand close to the head in the folded state and the efficiency in the folded state in the free space scenario is less than or equal to 3dB; the difference between the efficiency of the antenna assembly when held in the right hand close to the head in the folded state and the efficiency of the antenna assembly when held in the left hand close to the head when the first body and the second body are in the folded state is less than or equal to 3dB.

22. The electronic device according to claim 15, characterized in that: The second radiator further includes a third connection point, and the third connection point is located between the first connection point and the second ground terminal; The antenna assembly further includes a third switch unit and a fourth switch unit, wherein one end of the third switch unit is electrically connected to the third connection point, and the other end of the third switch unit is grounded; one end of the fourth switch unit is electrically connected to the second grounding end, and the other end of the fourth switch unit is grounded; The antenna assembly has a first working state and a second working state. The first working state is that the third switch unit is disconnected and the third antenna unit is turned on; the second working state is that the fourth switch unit is disconnected and the second antenna unit is turned on.

23. The electronic device according to claim 22, characterized in that: The electronic device further includes a controller, and when the electronic device is in a folded state, the controller switches the first working state or the second working state according to the signal strength working at the first low frequency.

24. The electronic device according to claim 22, characterized in that: The antenna assembly further includes a third radiator and a second signal source, wherein the third radiator is disposed at the top edge, and the third radiator includes a third free end, a second feeding point, and a third grounding end that are sequentially arranged; the second signal source is electrically connected to the second feeding point to excite the third radiator to generate a second resonance mode that supports the first frequency band; When the electronic device is in a folded state, the direction in which the third ground end points to the third free end is opposite to the direction in which the second ground end points to the second free end, and in the thickness direction of the electronic device, the third radiator is opposite to and coupled with at least part of the second radiator, and the first frequency band includes the GPS frequency band.

25. The electronic device according to claim 24, characterized in that: The length between the second ground end and the second free end is greater than the length of the third radiator, and when the third radiator operates in the first frequency band, the antenna assembly operates in the first operating state.

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