Foldable electronic device

Abstract

The invention provides a foldable electronic device. The foldable electronic equipment comprises a foldable main body and an antenna assembly, and the foldable main body comprises a first foldable main body and a second foldable main body so as to present a folded state and an unfolded state; the antenna assembly comprises a first radiator, a second radiator and a feed source. The first radiator is arranged corresponding to the first main body and is provided with a feeding point; the feed source is electrically connected to the feed point; the second radiator is arranged corresponding to the second main body; when the foldable electronic device is in an unfolded state, the first radiator and the second radiator are located on the same side of the foldable electronic device, the first radiator is excited to generate a first resonance mode, and the first resonance mode supports a first frequency band. When in the folded state, the second radiator and the first radiator are at least partially stacked and coupled, the first radiator and the second radiator are excited to generate a second resonance mode to support a first frequency band, the second radiator is excited to generate a first resonance current I1, the first radiator is excited to generate a second resonance current I2 opposite to the first resonance current, and I2 is smaller than I1.

Description

Technical Field

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

[0002] Electronic devices that can be unfolded and folded have attracted more and more attention because they have a large display screen when unfolded and occupy a small space and are easy to carry when folded. However, the performance of some antennas of electronic devices deteriorates seriously after being folded, which affects the user experience. Therefore, how to improve the antenna performance of foldable electronic devices when folded and unfolded has become a technical problem that needs to be solved. Summary of the invention

[0003] In a first aspect, the present application provides a foldable electronic device. The foldable electronic device comprises a foldable body and an antenna assembly, wherein the foldable body comprises a foldable first body and a foldable second body, so that the foldable electronic device can be in a folded state and an unfolded state; the antenna assembly comprises:

[0004] A first radiator is arranged corresponding to the first body, and the first radiator has a feeding point;

[0005] a feed source electrically connected to the feed point; and

[0006] A second radiator is arranged corresponding to the second body;

[0007] When the foldable electronic device is in an unfolded state, the first radiator and the second radiator are located on the same side of the foldable electronic device, and the first radiator is excited to generate a first resonance mode, wherein the first resonance mode supports a first frequency band within a preset frequency band range;

[0008] When the foldable electronic device is in a folded state, the second radiator is at least partially stacked and coupled with the first radiator, and the first radiator and the second radiator are excited to generate a second resonance mode, wherein the second radiator is excited to generate a first resonance current, and the first radiator is excited to generate a second resonance current that is opposite to the first resonance current, and the current value of the second resonance current is smaller than the current value of the first resonance current, and the second resonance mode supports the first frequency band within the preset frequency band range.

[0009] In summary, in the foldable electronic device provided in the embodiment of the present application, when the foldable electronic device is in the unfolded state, the first radiator serves as the main branch in the antenna assembly that supports the first frequency band. When the foldable electronic device is in the folded state, the working environment of the first radiator changes compared to when the foldable electronic device is in the unfolded state. Therefore, when the foldable electronic device is in the folded state, using the second radiator coupled with the first radiator as the main branch that supports the first frequency band can reduce or even avoid the degradation of the antenna performance of the first frequency band caused by the folding of the foldable electronic device, so that the foldable electronic device still has good antenna performance in the first frequency band when it is in the folded state.

[0010] In addition, since the first resonant current of the second radiator and the current flow direction of the second resonant current are opposite when the foldable electronic device is in the folded state, the magnetic field signal corresponding to the first resonant current on the second radiator and the magnetic field signal corresponding to the second resonant current on the first radiator are partially offset. Therefore, compared with the absence of a second resonant current on the first radiator that is opposite to the first resonant current, the foldable electronic device provided in the embodiment of the present application can reduce the electromagnetic wave signal absorbed by the human body in the folded state, and therefore can play a role in reducing the electromagnetic wave absorption ratio (Specific Absorption Rate, SAR). The foldable electronic device provided in the embodiment of the present application can ensure that the user folds the foldable electronic device and brings it close to the user, and when working in the first frequency band, it can play a role in reducing SAR. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] Figure 1 A schematic diagram of the structure of a foldable electronic device provided in an embodiment of the present application;

[0013] Figure 2 for Figure 1 An exploded perspective view of a foldable electronic device as shown in FIG.

[0014] Figure 3 A schematic diagram of a structure in which a first body and a second body of a foldable electronic device provided in an embodiment of the present application slide and fold;

[0015] Figure 4A schematic diagram of a structure in which a first body and a second body of a foldable electronic device provided in an embodiment of the present application are rotated and folded;

[0016] Figure 5 A schematic diagram of a portion of the structure of a foldable electronic device in an unfolded state provided by an embodiment of the present application;

[0017] Figure 6 for Figure 5 A schematic diagram of a three-dimensional structure of a foldable electronic device when a partial structure thereof is in a folded state;

[0018] Figure 7 for Figure 5 A side view of a partial structure of a foldable electronic device provided in the embodiment of the present invention when the foldable electronic device is in a folded state;

[0019] Figure 8 for Figure 6 A schematic diagram of a first resonant current and a second resonant current in a foldable electronic device shown;

[0020] Fig. 9 for Figure 6 A schematic diagram of a third resonant current and a fourth resonant current in a foldable electronic device shown;

[0021] Fig.10 A schematic diagram of a characteristic mode of a mainboard of a foldable electronic device 1 provided in an embodiment of the present application when the foldable electronic device 1 is in a folded state;

[0022] Fig.11 for Figure 5 A schematic diagram of a fifth resonant current in a foldable electronic device shown;

[0023] Fig.12 for Figure 5 Schematic diagram of the sixth resonant current in the foldable electronic device shown in;

[0024] Fig.13 for Figure 5 Schematic diagram of the coupling gap when the foldable electronic device shown in is in the unfolded state;

[0025] Figure 14-Figure 21 Schematic diagrams of a first matching circuit and a second matching circuit provided in each embodiment;

[0026] Fig. 22 A schematic diagram of a first matching circuit in a foldable device provided in one embodiment of the present application;

[0027] Fig.23 A schematic diagram of the efficiency of a foldable electronic device in an unfolded state provided by an embodiment;

[0028] Fig.24A schematic diagram of the efficiency of a foldable electronic device in a folded state provided by an embodiment;

[0029] Fig.25 A schematic diagram of simulation curves of S parameters, system total efficiency and system radiation efficiency of a foldable electronic device in a folded state provided by an embodiment;

[0030] Fig.26 A schematic diagram of simulation curves of the total system efficiency and the system radiation efficiency of a foldable electronic device provided in an embodiment when the foldable electronic device is in an unfolded state and a folded state.

[0031] Description of main component numbers:

[0032] Foldable electronic device 1, foldable body 10, first body 11, electrical connector 12, first free edge 111, first connecting edge 112, first side edge 113, second side edge 114, second body 13, second free edge 131, second connecting edge 132, third side edge 133, fourth side edge 134, coupling gap 11a, coupling gap 11b;

[0033] Antenna assembly 20, first radiator 21, feeding point P, first free end 21, first ground end 211, first free end 212, feed source S, second radiator 22, second ground end 221, second free end 222;

[0034] Floor 30, first matching circuit M1, second matching circuit M2, housing 40, first housing 41, second housing 42, flexible display screen 50, first fixing portion 51, bending portion 52, second fixing portion 53;

[0035] Switch 610, matching sub-circuit 620, impedance matching sub-circuit 630, series unit 60a, first end 611, second end 612, control end 613;

[0036] The first resonant current I1, the second resonant current I2, the third resonant current I3, the fourth resonant current I4, the fifth resonant current I5, and the sixth resonant current I6. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] See also Figure 1 , Figure 1 A schematic diagram of the structure of a foldable electronic device provided in an embodiment of the present application. The foldable electronic device 1 includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, and other devices with communication functions and capable of being folded or unfolded. The present application embodiment is described using a mobile phone as an example, and other electronic devices may refer to this embodiment.

[0041] For ease of description, see Figure 2 , Figure 2 It is a schematic diagram of the partial disassembled structure of the foldable electronic device 1 provided in the embodiment of the present application. The thickness direction of the foldable electronic device 1 is defined as the Z-axis direction, the length direction is the Y-axis direction, and the width direction is the X-axis direction, and the Z-axis, Y-axis, and X-axis are perpendicular to each other. The present application does not limit the size of the foldable electronic device 1 in the length direction and the width direction. In some embodiments, the size of the foldable electronic device 1 in the length direction is greater than the size in the width direction. In other embodiments, the size of the foldable electronic device 1 in the width direction is greater than or equal to the size in the length direction.

[0042] See also Figure 2 and Figure 3 , Figure 2 for Figure 1 An exploded perspective view of a foldable electronic device as shown in FIG. Figure 3 The foldable electronic device 1 provided in the embodiment of the present application at least comprises a foldable body 10 and an antenna assembly 20.

[0043] See also Figure 3 The foldable body 10 includes a first body 11 and a second body 13. The first body 11 and the second body 13 are movably connected to present a folded state or an unfolded state. In the embodiment of the present application, the movably connected state is not limited to a sliding connection, a rotating connection, or a combination of rotating and sliding, so that the first body 11 and the second body 13 are transformed from a folded state to an unfolded state, or from an unfolded state to a folded state.

[0044] The following is an example of the environment in which the antenna assembly 20 of the foldable electronic device 1, the foldable body 10, etc. is located with reference to the accompanying drawings.

[0045] See also Figure 2 , the foldable electronic device 1 also includes a shell 40. The shell 40 includes a first shell 41 and a second shell 42. The first shell 41 is covered on the outside of the first body 11, and the second shell 42 is covered on the outside of the second body 13. Among them, each shell 40 includes a bottom plate (also called a back cover) and a frame surrounding the periphery of the bottom plate. The bottom plate and the frame around it include a receiving space. Among them, the radiator of the antenna assembly 20 (at least one of the first radiator 21 or the second radiator 22 described later) can be a part of the frame. Among them, the first body 11 is arranged on the bottom plate of the first shell 41 (contained in the first shell 41), and the second body 13 is arranged on the bottom plate of the second shell 42 (contained in the second shell 42). The receiving space is also used to accommodate devices such as the floor 30, the camera module, the receiver module, the battery, and various sensors. The material of the foldable body 10 is a metal conductive material. The present application is not limited to the shapes of the first body 11 and the second body 13. Optionally, the first body 11 may be substantially rectangular, and the second body 13 may be substantially rectangular, and their shapes are not specifically limited, including but not limited to rectangular, square, irregular, etc. The foldable body 10 is provided with through holes, notches, grooves, etc. to accommodate devices.

[0046] The present application does not make any specific limitation on the foldable body 10. Optionally, the foldable body 10 includes but is not limited to a middle plate inside the middle frame of the foldable electronic device 1. The middle plate is used to carry circuit boards, form receiving slots for receiving electronic devices, avoid gaps, etc. The middle plate can be made of metal, or non-metal, or a combination of metal and non-metal. When the middle plate is made of metal, such as magnesium-aluminum alloy, the middle plate can also be used as a reference ground system for the foldable electronic device 1.

[0047] In other embodiments, the floor and the frame are separate structures, and the middle plate and the frame are interconnected and integrated.

[0048] The foldable body 10 includes a folded state or an unfolded state. In the folded state, the first body 11 and the second body 13 are stacked in the thickness direction (Z-axis direction), specifically, along the Z-axis direction, the first body 11 and the second body 13 are respectively arranged in the upper and lower layers.

[0049] The unfolded state is when the first body 11 is translated from the folded state to an overlap area with the second body 13 that is smaller than a preset area, and the preset area is, for example, 20%, 15%, 10%, 5%, 1%, 0%, etc. of the area of ​​the first body 11. At this time, the foldable electronic device 1 includes but is not limited to a slide-type mobile phone.

[0050] See also Figure 3 The first body 11 and the second body 13 are connected by a sliding rail. For example, the sliding rail extends along the Y-axis direction. The first body 11 and / or the second body 13 slide along the extension direction of the sliding rail to a folded state or an unfolded state. Figure 3 The solid line in the middle is in the folded state, and the first body 11 is located Figure 3 The dotted line in the middle indicates the expanded state.

[0051] The unfolded state may also be that the first body 11 is flipped from the folded state to an overlap area with the second body 13 that is less than a preset area, and the preset area is, for example, 20%, 15%, 10%, 5%, 1%, 0%, etc. of the area of ​​the first body 11. At this time, the foldable electronic device 1 includes but is not limited to a foldable mobile phone.

[0052] See also Figure 4 , Figure 4 A schematic diagram of the structure of the first body and the second body of the foldable electronic device provided in an embodiment of the present application rotating and folding. The first body 11 and the second body 13 are connected to each other by a rotating shaft. The axial direction of the rotating shaft is the X-axis direction. The first body 11 and / or the second body 13 rotate around the rotating shaft to a folded state or an unfolded state. The first body 11 is located at Figure 4 The solid line in the middle is in the folded state, and the first body 11 is located Figure 4 The dotted line in the middle indicates the expanded state.

[0053] The embodiment of the present application is described by taking the rotational connection between the first body 11 and the second body 13 as an example.

[0054] See also Figure 2, the foldable electronic device 1 also includes a flexible display screen 50. The flexible display screen 50 is arranged on the front side of the foldable main body 10 (the front side refers to the direction facing the user when the user normally uses the flexible display screen 50). The flexible display screen 50 includes a first fixing portion 51, a bending portion 52, and a second fixing portion 53 arranged in sequence. The first fixing portion 51 is fixedly connected to the first shell 41, and the second fixing portion 53 is fixedly connected to the second shell 42, and the fixing method thereof includes but is not limited to gluing, etc. The bending portion 52 is arranged on the rotating connection mechanism, and the connection method between the two can be a fixed connection or a non-connected state. The bending portion 52 bends when the foldable electronic device 1 is used, and its shape when bent includes but is not limited to a water drop shape or a U shape.

[0055] Please also read Figure 5 , Figure 6 and Figure 7 , Figure 5 A schematic diagram of a portion of the structure of a foldable electronic device in an unfolded state provided by an embodiment of the present application; Figure 6 for Figure 5 A schematic diagram of a three-dimensional structure of a foldable electronic device when a partial structure thereof is in a folded state; Figure 7 for Figure 5 A side view of a partial structure of a foldable electronic device provided in the embodiment of the present invention when it is in a folded state. The foldable electronic device 1 includes a foldable body 10 and an antenna assembly 20. The foldable body 10 includes a foldable first body 11 and a second body 13 so that the foldable electronic device 1 is in a folded state and an unfolded state. The antenna assembly 20 includes a first radiator 21, a feed source S, and a second radiator 22. The first radiator 21 is arranged corresponding to the first body 11, and the first radiator 21 has a feed point P. The feed source S is electrically connected to the feed point P. The second radiator 22 is arranged corresponding to the second body 13. When the foldable electronic device 1 is in an unfolded state, the first radiator 21 and the second radiator 22 are located on the same side of the foldable electronic device 1, and the first radiator 21 is excited to generate a first resonance mode, wherein the first resonance mode supports a first frequency band. When the foldable electronic device 1 is in a folded state, the second radiator 22 is at least partially stacked and coupled with the first radiator 21, and the second radiator 22 is excited to generate a second resonance mode, wherein the second resonance mode supports the first frequency band within a preset frequency band range.

[0056] See also Figure 5The first body 11 includes a first connecting edge 112 and a first free edge 111 that are disposed opposite to each other. The first body 11 is substantially rectangular. The first connecting edge 112 and the first free edge 111 are edges at two ends along the Y-axis direction. The first body 11 also includes a first side edge 113 and a second side edge 114 that are disposed opposite to each other and are both connected between the first free edge 111 and the first connecting edge 112. The first side edge 113 and the second side edge 114 are edges at two ends along the X-axis direction.

[0057] See also Figure 5 The second body 13 includes a second connecting edge 132 and a second free edge 131 which are arranged opposite to each other. The second body 13 is roughly rectangular. The second connecting edge 132 and the second free edge 131 are edges at two ends along the Y-axis direction. The second body 13 also includes a third side edge 133 and a fourth side edge 134 which are arranged opposite to each other and are both connected between the second free edge 131 and the second connecting edge 132. The third side edge 133 and the fourth side edge 134 are edges at two ends along the X-axis direction.

[0058] See also Figure 5 , the first body 11 and the second body 13 are both conductive parts. That is, the first body 11 and the second body 13 are both conductive structures. When the first body 11 and the second body 13 are folded, the first body 11 and the second body 13 are arranged opposite to each other. The first body 11 and the second body 13 are similar to two similar conductive plate structures.

[0059] In one embodiment, the first connecting edge 112 and the second connecting edge 132 are rotatably electrically connected via the electrical connector 12. When the first body 11 is folded relative to the second body 13, the first body 11 and the second body 13 are folded in half. The first free edge 111 and the second free edge 131 are aligned with each other and spaced apart. In other words, the lengths of the first body 11 and the second body 13 in the Y-axis direction are similar or the same.

[0060] See also Figure 5 When the foldable electronic device 1 is in the unfolded state, the first side edge 113 and the third side edge 133 are arranged in a collinear or approximately collinear manner, and the second side edge 114 and the fourth side edge 134 are arranged in a collinear or approximately collinear manner. When the foldable electronic device 1 is in the folded state, the first side edge 113 and the third side edge 133 are aligned and spaced apart; the second side edge 114 and the fourth side edge 134 are aligned and spaced apart, and the first free edge 111 and the second free edge 131 are aligned and spaced apart.

[0061] In the schematic diagram of this embodiment, the first radiator 21 is disposed on one side of the first side 113, and the second radiator 22 is disposed on one side of the third side 133. When the foldable electronic device 1 is in the unfolded state, the first radiator 21 and the second radiator 22 are located on the right side of the foldable body 10. It can be understood that as the foldable electronic device 1 is placed in different postures, the positions of the first radiator 21 and the second radiator 22 relative to the foldable body 10 also change.

[0062] The first radiator 21 can be a Laser Direct Structuring (LDS) radiator, or a Flexible Printed Circuit (FPC) radiator, or a Print Direct Structuring (PDS) radiator, or a metal branch radiator. When the antenna assembly 20 is applied to the foldable electronic device 1, the first radiator 21 can be a structural antenna (Mechanical Design Antenna, MDA) radiator designed using the metal insert of the foldable electronic device 1 itself. For example, the first radiator 21 can be an antenna radiator designed using the middle frame formed by plastic and metal of the foldable electronic device 1. In addition, the first radiator 21 can also be a radiator of a metal frame antenna designed with a metal middle frame.

[0063] It is understandable that the present application does not specifically limit the shape, structure and material of the first radiator 21, and the shapes of the first radiator 21 include but are not limited to bent, straight, L-shaped, sheet-shaped, rod-shaped, coated, thin film, etc. When the first radiator 21 is in a strip shape, the present application does not limit the extension track of the first radiator 21, so the first radiator 21 can be extended in a straight line, a curve, a multi-stage bend, etc. The first radiator 21 can be a line with uniform width on the extension track, or it can be an irregular shape with different widths such as a gradual width and a widened area.

[0064] The feed source S may be electrically connected to the feed point P by, but is not limited to, direct electrical connection (such as welding) or indirect electrical connection to the feed point P by coaxial line, microstrip line, conductive spring, conductive glue, etc.

[0065] The second radiator 22 can be a Laser Direct Structuring (LDS) radiator, or a Flexible Printed Circuit (FPC) radiator, or a Print Direct Structuring (PDS) radiator, or a metal branch radiator. When the antenna assembly 20 is applied to the foldable electronic device 1, the second radiator 22 can be a structural antenna (Mechanical Design Antenna, MDA) radiator designed using the metal insert of the foldable electronic device 1 itself. For example, the second radiator 22 can be an antenna radiator designed using the middle frame formed by plastic and metal of the foldable electronic device 1. In addition, the second radiator 22 can also be a radiator of a metal frame antenna designed with a metal middle frame.

[0066] It is understandable that the present application does not specifically limit the shape, structure and material of the second radiator 22. The shapes of the second radiator 22 include but are not limited to bent, straight, L-shaped, sheet-shaped, rod-shaped, coated, thin film, etc. When the second radiator 22 is in a strip shape, the present application does not limit the extension trajectory of the second radiator 22, so the second radiator 22 can extend in a straight line, a curve, a multi-stage bend, etc. The second radiator 22 can be a line with uniform width on the extension trajectory, or it can be an irregular shape with different widths such as a gradual width and a widened area. The second radiator 22 can be made of the same or different material as the first radiator 21, and the embodiments of the present application do not limit this.

[0067] The foldable electronic device 1 provided in the embodiment of the present application, when the foldable electronic device 1 is in a folded state, the second radiator 22 is at least partially overlapped with the first radiator 21, and the second radiator 22 is spaced apart from the first radiator 21 to form a coupling gap 11a, and the second radiator 22 can be coupled with the first radiator 21 through the coupling gap 11a.

[0068] When the foldable electronic device 1 is in an unfolded state, the first radiator 21 is excited by the feed source S to generate a first resonance mode, and the first resonance mode is used to support the first frequency band of the preset frequency band range. This will be explained later in conjunction with the simulation diagram of the antenna assembly 20. When the foldable electronic device 1 is in an unfolded state, the first radiator 21 serves as a main radiation branch in the antenna assembly 20 that supports the first frequency band.

[0069] When the foldable electronic device 1 is in the unfolded state, the first radiator 21 serves as the main radiating branch in the antenna assembly 20 that supports the first frequency band. However, when the foldable electronic device 1 changes from the unfolded state to the folded state: the working environment of the first radiator 21 changes. If the first radiator 21 continues to be used as the main radiating branch that supports the first frequency band, the antenna performance of the antenna assembly 20 supporting the first frequency band will be seriously degraded. For example, the radiation effect of the antenna assembly 20 supporting the first frequency band is not high, which in turn affects the antenna performance of the antenna assembly 20 in the first frequency band. When the foldable electronic device 1 is in the folded state, the foldable electronic device 1 provided in the embodiment of the present application uses the second radiator 22 as the radiating branch that supports the first frequency band. The second radiator 22 is excited by the first radiator 21 to generate a second resonance mode, rather than continuing to use the first radiator 21 to support the first frequency band. Therefore, the degradation of the antenna performance in the first frequency band caused by the foldable electronic device 1 changing from the unfolded state to the foldable state can be overcome.

[0070] In summary, in the foldable electronic device 1 provided in the embodiment of the present application, when the foldable electronic device 1 is in the unfolded state, the first radiator 21 serves as the main branch supporting the first frequency band in the antenna assembly 20. When the foldable electronic device 1 is in the folded state, the working environment of the first radiator 21 changes compared to when the foldable electronic device 1 is in the unfolded state. Therefore, when the foldable electronic device 1 is in the folded state, using the second radiator 22 coupled to the first radiator 21 as the main branch supporting the first frequency band can reduce or even avoid the degradation of the antenna performance of the first frequency band caused by the folding of the foldable electronic device 1, so that the foldable electronic device 1 still has good antenna performance in the first frequency band when it is in the folded state.

[0071] Next, the specific structures of the first radiator 21 and the second radiator 22 and the situation where the foldable electronic device 1 is in the folded state are described in detail. Figures 5 to 7, the first radiator 21 includes a first grounding end 211 and a first free end 212. The first grounding end 211 is grounded, the feeding point P is located between the first grounding end 211 and the first free end 212, and the first grounding end 211 is away from the second body 13 compared to the first free end 212. The second radiator 22 includes a second grounding end 221 and a second free end 222. The second grounding end 221 is grounded, and the second grounding end 221 is closer to the first free end 212 than the second free end 222. When the foldable electronic device 1 is in a folded state: the second free end 222 is arranged corresponding to the first grounding end 211, the second grounding end 221 is arranged corresponding to the first free end 212, and a coupling gap 11a is formed between the second radiator 22 and the first radiator 21, and in the direction from the first body 11 to the second body 13, the size W of the coupling gap 11a satisfies: 0.5mm≤W≤4.0mm.

[0072] The first grounding terminal 211 is electrically connected to the ground of the foldable electronic device 1 to ground the first grounding terminal 211. The grounding of the first grounding terminal 211 includes but is not limited to the following embodiments. The way in which the first grounding terminal 211 is electrically connected to the ground may include but is not limited to direct electrical connection (such as welding), or indirect electrical connection to the ground of the foldable electronic device 1 through a coaxial line, a microstrip line, a conductive spring, a conductive glue, etc. In this embodiment, the first body 11 is a conductive component that can constitute a ground, so the first grounding terminal 211 is electrically connected to the first body 11 to be grounded.

[0073] The second grounding terminal 221 is electrically connected to the ground of the foldable electronic device 1 to ground the second grounding terminal 221. The grounding of the second grounding terminal 221 includes but is not limited to the following embodiments. The way in which the second grounding terminal 221 is electrically connected to the ground may include but is not limited to direct electrical connection (such as welding), or indirect electrical connection to the ground of the foldable electronic device 1 through a coaxial line, a microstrip line, a conductive spring, a conductive glue, etc. In this embodiment, the second body 13 is a conductive component that can constitute a ground, so the second grounding terminal 221 is electrically connected to the second body 13 to be grounded.

[0074] For example, the size W of the coupling slot 11a may be, but is not limited to, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, or 4.0 mm. When the foldable electronic device 1 is in a folded state, in the direction from the first body 11 to the second body 13, the size W of the coupling slot 11a satisfies: 0.5 mm ≤ W ≤ 4.0 mm, so that the second radiator 22 can better couple the energy of the first radiator 21 and have a better coupling effect, thereby enabling the second radiator 22 to have better antenna performance when supporting the first frequency band.

[0075] In this embodiment, when the first radiator 21 and the second radiator 22 are excited to generate a second resonance mode, the second resonance mode includes a quarter-wavelength mode of the second radiator 22 .

[0076] The quarter-wavelength mode is also called the fundamental mode, and the second resonant mode includes the quarter-wavelength mode of the second radiator 22, that is, the second radiator 22 operates in the fundamental mode. When the second radiator 22 operates in the fundamental mode, the first radiator 21 and the second radiator 22 have better radiation efficiency when supporting the first frequency band of the preset frequency band range.

[0077] Specifically, see Figure 8 , Figure 8 for Figure 6 A schematic diagram of the first resonant current and the second resonant current in the foldable electronic device shown. When the first radiator 21 and the second radiator 22 are excited to generate the second resonant mode: the second radiator 22 is excited to generate the first resonant current I1, and the first radiator 21 is excited to generate the second resonant current I2 which is opposite to the first resonant current I1, and the current value of the second resonant current I2 is less than the current value of the first resonant current I1.

[0078] Specifically, in the schematic diagram of the present embodiment, the first resonant current I1 is represented by a solid line, and the second resonant current I2 is represented by a dotted line. The current value of the second resonant current I2 is less than the current value of the first resonant current I1. In other words, in the antenna assembly 20 provided in the embodiment of the present application, the current corresponding to the quarter-wavelength mode on the second radiator 22 is dominant, accompanied by a reverse current with a smaller current intensity on the first radiator 21. Since the current flow direction of the first resonant current I1 of the second radiator 22 is opposite to that of the second resonant current I2, the magnetic field signal corresponding to the first resonant current I1 on the second radiator 22 and the magnetic field signal corresponding to the second resonant current I2 on the first radiator 21 are partially offset. Therefore, compared with the absence of the second resonant current I2 on the first radiator 21 that is opposite to the first resonant current I1, the foldable electronic device 1 provided in the embodiment of the present application can reduce the electromagnetic wave signal absorbed by the human body in the folded state, and therefore can play a role in reducing the electromagnetic wave absorption ratio (Specific Absorption Rate, SAR). The foldable electronic device 1 provided in the embodiment of the present application can ensure that the user folds the foldable electronic device 1 and puts it close to the user (for example, in a pocket), and when working in the first frequency band, it can play a role in reducing SAR. In addition, generally speaking, the foldable electronic device 1 provided in the embodiment of the present application is in the unfolded state as the main working scene, and at this time, the performance antenna performance of the first frequency band is better.

[0079] In one embodiment, when the foldable electronic device 1 is in an unfolded state and the antenna assembly 20 supports the first frequency band, the SAR value of the foldable electronic device 1 is a first SAR value; when the foldable electronic device 1 is in a folded state and the antenna assembly 20 supports the first frequency band, the SAR value of the foldable electronic device 1 is a second SAR value, wherein the second SAR value is less than the first SAR value.

[0080] In this embodiment, when the foldable electronic device 1 is in a folded state, since the first radiator 21 is excited to generate a second resonant current I2 which is opposite to the first resonant current I1, the magnetic field signal corresponding to the first resonant current I1 on the second radiator 22 and the magnetic field signal corresponding to the second resonant current I2 on the first radiator 21 are partially offset, thereby making the SAR (i.e., the second SAR value) of the foldable electronic device 1 when it is in a folded state and supports the first frequency band lower than the SAR value (i.e., the first SAR value) of the foldable electronic device 1 when it is in an unfolded state and supports the first frequency band (i.e., the second SAR value), and the radiation to the user is smaller.

[0081] When the foldable electronic device 1 is in a folded state, the first radiator 21 and the second radiator 22 are excited to support a third resonance mode within the preset frequency band range, wherein the resonance frequency point of the resonance frequency band supported by the third resonance mode is located in the preset frequency band and is less than the resonance frequency point corresponding to the second resonance mode.

[0082] In this embodiment, when the first radiator 21 and the second radiator 22 are excited to support the third resonance mode of the preset frequency range, the first radiator 21 and the second radiator 22 support the second frequency band of the preset frequency range.

[0083] When the foldable electronic device 1 provided in the embodiment of the present application is in a folded state, the resonant frequency of the third resonant mode is lower than the resonant frequency of the second resonant mode. In other words, the resonant frequency of the first radiator 21 and the second radiator 22 in the second frequency band supported by the third resonant mode is large, and the resonant frequency of the first radiator 21 and the second radiator 22 in the first frequency band supported by the first resonant mode is small. That is, the resonant frequency of the second frequency band is lower than the resonant frequency of the first frequency band. The antenna assembly 20 provided in the embodiment of the present application, the resonant frequency of the second frequency band is lower than the resonant frequency of the first frequency band, which can help improve the bandwidth and radiation efficiency of the first radiator 21 and the second radiator 22 when supporting the first frequency band.

[0084] When the first radiator 21 and the second radiator 22 are excited to generate a third resonance mode, the third resonance mode includes a quarter wavelength mode of the first radiator 21 .

[0085] The quarter-wavelength mode is also called the fundamental mode, and the third resonance mode includes the quarter-wavelength mode of the first radiator 21, that is, the first radiator 21 operates in the fundamental mode. When the first radiator 21 operates in the fundamental mode, the first radiator 21 supports the second frequency band of the preset frequency band range with good radiation efficiency.

[0086] See also Fig. 9 , Fig. 9 for Figure 6 The schematic diagram of the third resonant current and the fourth resonant current in the foldable electronic device shown in FIG. When the first radiator 21 is excited to generate the third resonant mode, it has a third resonant current I3, and the second radiator 22 is excited to generate a fourth resonant current I4 which is opposite to the third resonant current I3, and the current value of the fourth resonant current I4 is less than the current value of the third resonant current I3.

[0087] Specifically, in the schematic diagram of the present embodiment, the third resonant current I3 is represented by a solid line, and the fourth resonant current I4 is represented by a dotted line. The current value of the fourth resonant current I4 is less than the current value of the third resonant current I3. In other words, in the antenna assembly 20 provided in the embodiment of the present application, when the first radiator 21 and the second radiator 22 are excited to generate the third resonant mode, the current corresponding to the quarter-wavelength mode on the first radiator 21 is dominant, accompanied by a reverse current with a smaller current intensity on the second radiator 22. Since the third resonant current I3 of the first radiator 21 and the fourth resonant current I4 flow in opposite directions, the magnetic field signal corresponding to the third resonant current I3 on ​​the first radiator 21 and the magnetic field signal corresponding to the fourth resonant current I4 on the second radiator 22 are partially offset. Therefore, compared with the absence of the fourth resonant current I4 on the second radiator 22 that is opposite to the third resonant current I3, the foldable electronic device 1 provided in the embodiment of the present application can reduce the electromagnetic wave signal absorbed by the human body in the folded state, and thus can play a role in reducing SAR. The foldable electronic device 1 provided in the embodiment of the present application can ensure that when the user folds the foldable electronic device 1 and puts it in a pocket, it can play the function of reducing SAR when working in the second frequency band. In addition, generally speaking, the foldable electronic device 1 provided in the embodiment of the present application is in the unfolded state as the main working scene, and at this time, the performance antenna performance of the second frequency band is better.

[0088] See also Fig.10 , Fig.10 A schematic diagram of a characteristic mode of a mainboard of a foldable electronic device 1 provided in an embodiment of the present application when the foldable electronic device 1 is in a folded state. The foldable electronic device 1 further includes a floor 30. In this embodiment, the floor 30 is the ground of the mainboard of the foldable electronic device 1. It can be understood that in other embodiments, the floor 30 is also the front shell (also called the middle frame) of the foldable electronic device 1, or the conductive battery cover of the foldable electronic device 1, or the shielding member (also called the supporting member) of the display screen of the foldable electronic device 1, etc. When the foldable electronic device 1 is in a folded state, the antenna assembly 20 also supports a fourth resonance mode, wherein the resonance frequency band supported by the fourth resonance mode is located in the preset frequency band, and the fourth resonance mode is the characteristic mode of the floor 30. When the floor 30 is the ground of the mainboard of the foldable electronic device 1, the fourth resonance mode is the characteristic mode of the mainboard.

[0089] In this embodiment, when the foldable electronic device 1 is in a folded state and the floor 30 of the foldable electronic device 1 is excited to support the fourth resonance mode, the floor 30 supports the third frequency band of the preset frequency band range.

[0090] When the foldable electronic device 1 operates in the third frequency band, the floor 30 acts as an antenna radiator to receive and transmit electromagnetic wave signals in the third frequency band within the preset frequency band, and has good radiation efficiency. In addition, compared with using a separate radiator to directly receive and transmit electromagnetic wave signals in the third frequency band, the floor 30 of the foldable electronic device 1 in this embodiment is reused as a radiator to reduce the number of radiators in the foldable electronic device 1, thereby reducing the difficulty of device layout in the foldable electronic device 1.

[0091] In this embodiment, when the foldable electronic device 1 is in a folded state, the floor 30 of the foldable electronic device 1 is excited to generate a fourth resonance mode, supporting the third frequency band of the preset frequency band range, so that the antenna assembly 20 has a better communication effect within the preset frequency band range. In one embodiment, the resonance frequency of the third frequency band is greater than the resonance frequency of the second frequency band.

[0092] In one embodiment, the resonant current corresponding to the characteristic mode of the floor 30 is a half-wavelength characteristic mode along the length direction of the foldable electronic device 1. In this embodiment, the length direction of the foldable electronic device 1 is the extension direction of the third side 133 of the foldable electronic device 1, which can also be regarded as the extension direction of the first side 113 of the foldable electronic device 1.

[0093] When the resonant current corresponding to the characteristic mode of the floor 30 is along the length direction of the foldable electronic device 1 and is a half-wavelength characteristic mode, it can be excited more conveniently and the floor 30 can have better radiation efficiency in the third frequency band within the preset frequency band.

[0094] Next, the situation where the foldable electronic device 1 is in the unfolded state is described in detail.

[0095] Further, in this embodiment, the first resonance mode is a quarter-wavelength mode of the first radiator 21 .

[0096] See also Fig.11 , Fig.11 for Figure 5Schematic diagram of the fifth resonant current in the foldable electronic device shown. When the first radiator 21 supports the first resonant mode, the first radiator 21 is excited to generate the fifth resonant current I5. The fifth resonant current I5 is distributed between the first ground terminal 211 and the first free end 212. In the schematic diagram of this embodiment, the fifth resonant current I5 flowing from the first ground terminal 211 to the first free end 212 is used as an example for illustration. It can be understood that the fifth resonant current I5 is a periodically changing current. In half of a cycle, the fifth resonant current I5 flows from the first ground terminal 211 to the first free end 212; in the other half of a cycle, the fifth resonant current I5 flows from the first free end 212 to the first ground terminal 211.

[0097] The quarter-wavelength mode is also called the fundamental mode. When the first radiator 21 works in the fundamental mode, the first radiator 21 has good radiation efficiency when supporting the first frequency band in the preset frequency band range.

[0098] Please continue reading Figure 5 When the foldable electronic device 1 is in the unfolded state, the second ground end 221 is spaced apart from the first free end 212 by a coupling gap 11b, the second radiator 22 is coupled to the first radiator 21 through the coupling gap 11b, and the second radiator 22 is excited to support the fifth resonance mode within the preset frequency band, and the resonance frequency of the fifth resonance mode is less than the resonance frequency of the first resonance mode.

[0099] In this embodiment, when the second radiator 22 is excited to support the fifth resonance mode within the preset frequency range, the second radiator 22 supports the second frequency band within the preset frequency range.

[0100] When the foldable electronic device 1 provided in the embodiment of the present application is in the unfolded state, the resonant frequency of the fifth resonant mode is lower than the resonant frequency of the first resonant mode. In other words, the resonant frequency supported by the second radiator 22 is small, and the resonant frequency supported by the first radiator 21 is large. That is, the resonant frequency of the second frequency band is lower than the resonant frequency of the first frequency band. The antenna assembly 20 provided in the embodiment of the present application, the resonant frequency of the second frequency band is lower than the resonant frequency of the first frequency band, which can help improve the bandwidth and radiation efficiency of the first radiator 21 when supporting the first frequency band.

[0101] The fifth resonance mode is a quarter-wavelength mode of the second radiator 22 .

[0102] See also Fig.12 , Fig.12 for Figure 5Schematic diagram of the sixth resonant current in the foldable electronic device shown in . When the second radiator 22 supports the fifth resonant mode, the second radiator 22 is excited to generate the sixth resonant current I6. The sixth resonant current I6 is distributed between the second ground terminal 221 and the second free end 222. In the schematic diagram of this embodiment, the sixth resonant current I6 flowing from the second ground terminal 221 to the second free end 222 is used as an example for illustration. It can be understood that the sixth resonant current I6 is a periodically changing current. In half of a cycle, the sixth resonant current I6 flows from the second ground terminal 221 to the second free end 222; in the other half of a cycle, the sixth resonant current I6 flows from the second free end 222 to the second ground terminal 221.

[0103] It can be understood that when the first radiator 21 supports the first resonance mode, the fifth resonance current I5 on the first radiator 21 and the sixth resonance current I6 on the second radiator 22 when the second radiator 22 supports the fifth resonance mode have the same flow direction. Fig.11 and Fig.12 In the figure, it is illustrated by taking the example that in half a cycle, the fifth resonant current I5 and the sixth resonant current I6 flow upward (from the perspective of the diagram), and in the other half a cycle, the fifth resonant current I5 and the sixth resonant current I6 flow downward (from the perspective of the diagram).

[0104] The quarter-wavelength mode is also called the fundamental mode, and the fifth resonance mode is the quarter-wavelength mode of the second radiator 22, that is, the second radiator 22 operates in the fundamental mode. When the second radiator 22 operates in the fundamental mode, the second radiator 22 has better radiation efficiency when supporting the second frequency band of the preset frequency band range.

[0105] See also Figure 5 and Fig.13 , Fig.13 for Figure 5 In one embodiment, when the foldable electronic device 1 is in the unfolded state, the dimension d of the coupling gap 11b along the arrangement direction of the first body 11 and the second body 13 satisfies: 5mm≤d≤10mm.

[0106] The size of the coupling gap 11b may be, but is not limited to, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0107] When the coupling gap 11b is too small, for example, less than 5mm, when the foldable electronic device 1 is in the unfolded state and the first body 11 and the second body 13 are relatively folded, the first radiator 21 and the second radiator 22 are easily interfered with, which may damage the first radiator 21 and the second radiator 22. When the coupling gap 11b is too large, for example, greater than 10mm, when the coupling effect between the second radiator 22 and the first radiator 21 is not good, the second radiator 22 cannot couple more energy from the first radiator 21, thereby reducing the antenna performance of the second radiator 22 when supporting the second frequency band. In addition, the effect of the second radiator 22 on increasing the bandwidth of the first frequency band supported by the first radiator 21 will also be reduced, and the improvement of the radiation efficiency of the second radiator 22 on the first frequency band supported by the first radiator 21 will also be reduced. In the foldable electronic device 1 provided in the embodiment of the present application, the dimension d of the coupling gap 11b along the arrangement direction of the first body 11 and the second body 13 satisfies: 5mm≤d≤10mm. On the one hand, when the foldable electronic device 1 is in the unfolded state and the first body 11 and the second body 13 are folded relative to each other, the first radiator 21 and the second radiator 22 are not easy to interfere with each other, and the first radiator 21 and the second radiator 22 are not easy to be damaged. On the other hand, the second radiator 22 can couple more energy from the first radiator 21, ensuring that the first frequency band supported by the second radiator 22 has a larger bandwidth and higher radiation efficiency.

[0108] Please continue reading Figure 5 The antenna assembly 20 further includes a first matching circuit M1 and a second matching circuit M2. One end of the first matching circuit M1 is electrically connected to the feed point P, and the other end of the first matching circuit M1 is electrically connected to the feed source S. The first matching circuit M1 is used to adjust the electrical length of the first radiator 21. One end of the second matching circuit M2 is electrically connected to the second ground terminal 221, and the other end of the second matching circuit M2 is grounded. The second matching circuit M2 is used to adjust the electrical length of the second radiator 22.

[0109] In one embodiment, the first matching circuit M1 includes a switch and a matching device (also referred to as a matching subcircuit). The matching device may be, but is not limited to, at least one of a variable capacitor or an inductor. For example, in one embodiment, the first matching circuit M1 may include a switch and a variable capacitor, etc.; the second matching circuit M2 may include a switch and a variable capacitor, etc. In another embodiment, the first matching circuit M1 may include a switch, a variable capacitor or an inductor, etc.; the second matching circuit M2 may include a switch, a variable capacitor or an inductor, etc.

[0110] Accordingly, in one embodiment, the second matching circuit M2 includes a switch and a matching device (also referred to as a matching subcircuit). The matching device may be, but is not limited to, at least one of a variable capacitor or an inductor. For example, in one embodiment, the second matching circuit M2 may include a switch and a variable capacitor, etc.; the second matching circuit M2 may include a switch and a variable capacitor, etc. In another embodiment, the second matching circuit M2 may include a switch, a variable capacitor or an inductor, etc.; the second matching circuit M2 may include a switch, a variable capacitor or an inductor, etc.

[0111] In another embodiment, the switch in the first matching circuit M1 may include a single-pole single-throw switch (SPST). When the foldable electronic device 1 is in the folded state: the switch and the matching device may be used to adjust the electrical length of the first radiator 21, thereby adjusting the second frequency band supported by the first radiator 21, or adjusting the resonant frequency point of the second frequency band supported by the first radiator 21.

[0112] Accordingly, in another embodiment, the switch in the second matching circuit M2 may include a single-pole single-throw switch (SPST). When the foldable electronic device 1 is in the folded state: the switch and the matching device may be used to adjust the electrical length of the second radiator 22, thereby adjusting the first frequency band supported by the second radiator 22, or adjusting the resonant frequency of the first frequency band supported by the second radiator 22.

[0113] The specific circuit structures of the first matching circuit M1 and the second matching circuit M2 are described below.

[0114] Please also read Figures 14 to 21 , Figure 14-Figure 21 Schematic diagrams of the first matching circuit and the second matching circuit provided in various embodiments. The matching sub-circuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes one or more of the following circuits.

[0115] Please also read Fig.14 ,exist Fig.14 In the embodiment, the matching sub-circuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes a band-pass circuit formed by connecting the inductor L0 and the capacitor C0 in series.

[0116] Please also read Fig.15 ,exist Fig.15 In the embodiment, the matching sub-circuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes a band-stop circuit formed by connecting an inductor L0 and a capacitor C0 in parallel.

[0117] See also Fig.16 ,exist Fig.16 In the embodiment, the matching subcircuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes an inductor L0, a first capacitor C1, and a second capacitor C2. The inductor L0 is connected in parallel with the first capacitor C1, and the second capacitor C2 is electrically connected to a node where the inductor L0 and the first capacitor C1 are electrically connected.

[0118] Please also read Fig.17 ,exist Fig.17 In the embodiment, the matching subcircuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes a capacitor C0, a first inductor L1, and a second inductor L2. The capacitor C0 is connected in parallel with the first inductor L1, and the second inductor L2 is electrically connected to a node where the capacitor C0 and the first inductor L1 are electrically connected. Fig.18 ,exist Fig.18 In the embodiment, the matching subcircuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes an inductor L0, a first capacitor C1, and a second capacitor C2. The inductor L0 is connected in series with the first capacitor C1, and one end of the second capacitor C2 is electrically connected to the first end of the inductor L0 that is not connected to the first capacitor C1, and the other end of the second capacitor C2 is electrically connected to the end of the first capacitor C1 that is not connected to the inductor L0.

[0119] Please also read Fig.19 ,exist Fig.19 In the embodiment, the matching subcircuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes a capacitor C0, a first inductor L1, and a second inductor L2. The capacitor C0 is connected in series with the first inductor L1, one end of the second inductor L2 is electrically connected to an end of the capacitor C0 that is not connected to the first inductor L1, and the other end of the second inductor L2 is electrically connected to an end of the first inductor L1 that is not connected to the capacitor C0.

[0120] Please also read Fig. 20 ,exist Fig. 20 In the embodiment, the matching subcircuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes a first capacitor C1, a second capacitor C2, a first inductor L1, and a second inductor L2. The first capacitor C1 is connected in parallel with the first inductor L1, the second capacitor C2 is connected in parallel with the second inductor L2, and one end of the whole formed by the second capacitor C2 and the second inductor L2 in parallel is electrically connected to one end of the whole formed by the first capacitor C1 and the first inductor L1 in parallel.

[0121] Please also read Fig.21 ,exist Fig.21In the embodiment, the matching subcircuit 620 in the first matching circuit M1 (or the second matching circuit M2) includes a first capacitor C1, a second capacitor C2, a first inductor L1, and a second inductor L2. The first capacitor C1 and the first inductor L1 are connected in series to form a first unit 113b. The second capacitor C2 and the second inductor L2 are connected in series to form a second unit 113c. The first unit 113b and the second unit 113c are connected in parallel.

[0122] The following is an introduction to a foldable electronic device provided by an embodiment of the present application. Fig. 22 , Fig. 22 This is a schematic diagram of a first matching circuit in a foldable device provided in one embodiment of the present application. Fig. 22 (a) is a schematic diagram of a switch in the first matching circuit being disconnected (off); Fig. 22 (b) is a schematic diagram when the switch in the first matching circuit is turned on. In this embodiment, the first matching circuit M1 includes a switch 610 and a matching sub-circuit 620 as an example for illustration. The matching sub-circuit 620 is connected in series with the switch 610 to form a series unit 60a, one end of the series unit 60a is electrically connected to the feeding point P, and the other end of the series unit 60a is grounded. When the foldable electronic device 1 is in the unfolded state, the switch 610 is disconnected, and the first radiator 21 is excited to generate the first resonant mode. When the foldable electronic device 1 is in the folded state, the switch 610 is turned on, and the second radiator 22 is excited to generate the first resonant current.

[0123] In this embodiment, the first end 611 is electrically connected to the feed point P, and the second end 612 is electrically connected to the matching sub-circuit 620 to the ground. It can be understood that in other embodiments, one end of the matching sub-circuit 620 is electrically connected to the feed point P, and the other end of the matching sub-circuit 620 is electrically connected to the switch 610 to the ground. In the schematic diagram of this embodiment, the switch 610 is a single-pole single-throw switch 610 as an example for illustration, and the switch 610 includes a first end 611, a second end 612 and a control end 613. When the control end 613 is disconnected from the electrical connection between the first end 611 and the second end 612, the switch 610 is disconnected; when the control end 613 is electrically connected to the first end 611 and the second end 612, the switch 610 is turned on. The matching sub-circuit 620 can refer to the previous description, which will not be repeated here.

[0124] In the schematic diagram of this embodiment, the first matching circuit M1 further includes an impedance matching subcircuit 630, and the first feed source S1 is electrically connected to the impedance matching subcircuit 630 to the feeding point P. The impedance matching subcircuit 630 is used to match the output impedance of the first feed source S1 and the input impedance of the first radiator 21, so that the excitation signal output by the feed source S1 can be output to the first radiator 21 more.

[0125] When the foldable electronic device 1 is in the unfolded state, the switch 610 is disconnected, the matching subcircuit 620 is not electrically connected to the path of the first radiator 21, and the first radiator 21 is excited to generate a first resonant mode. When the foldable electronic device 1 is in the folded state, the switch 610 is turned on, the matching subcircuit 620 is electrically connected to the path of the first radiator 21, and the matching subcircuit 620 adjusts the electrical length of the first radiator 21 so that the first radiator 21 no longer serves as the main branch supporting the first frequency band, and the second radiator 22 is used as the main radiation branch when the foldable electronic device 1 is in the folded state. Therefore, when the foldable electronic device 1 is in the folded state, the use of the second radiator 22 coupled with the first radiator 21 as the main branch supporting the first frequency band can reduce or even avoid the degradation of the antenna performance of the first frequency band caused by the folding of the foldable electronic device 1, so that the foldable electronic device 1 still has good antenna performance in the first frequency band when it is in the folded state.

[0126] Specifically, when the foldable electronic device 1 is in the unfolded state, the ground electrode of the foldable electronic device 1 is larger. When the foldable electronic device 1 is in the folded state, the ground electrode of the foldable electronic device 1 becomes smaller, and the ground electrode of the foldable electronic device 1 in the folded state is halved compared to the ground electrode of the foldable electronic device 1 in the unfolded state. Affected by the halving of the ground electrode of the foldable electronic device 1, the system total efficiency and system radiation efficiency of the mode (i.e., the third resonance mode) supported by the first radiator 21 are both reduced. At this time, through the switching of the switch, the switch 610 is turned on, and the matching subcircuit 620 is electrically connected to the feeding point P. Therefore, the second radiator 22 serves as the main radiation branch supporting the first frequency band. When the foldable electronic device 1 is in the folded state, the second radiator 22 is used as the main radiation branch supporting the first frequency band, which has a higher system radiation efficiency and a higher system total efficiency.

[0127] In this implementation, the preset frequency band range is a low frequency (Low Band, LB) frequency band, and the first frequency band is an N28 frequency band.

[0128] In this embodiment, the preset frequency band range is the LB frequency band, and the first frequency band is the N28 frequency band, so that the foldable electronic device 1 can communicate with other devices in the N28 frequency band of the low frequency band.

[0129] In other implementations, the preset frequency band range may also be a middle high frequency band (Middle High Band, MHB) or the like.

[0130] The first body 11 and the second body 13 are both conductive structures. When the foldable body 10 is in the unfolded state: the first body 11 is electrically connected to the second body 13, the first body 11 and the second body 13 constitute a radiating arm of a dipole antenna, and the other radiating arm of the dipole antenna includes at least the first radiator 21, wherein the dipole antenna supports the first frequency band.

[0131] In this embodiment, when the foldable body 10 is in the unfolded state, the first body 11 is electrically connected to the second body 13, and the first body 11 and the second body 13 constitute at least part of the ground pole in the foldable electronic device 1. The at least part of the ground pole constitutes a radiating arm of the dipole antenna, which can help reduce the size of the first radiator 21.

[0132] Next, the performance of the antenna assembly 20 in the foldable electronic device 1 provided in the embodiment of the present application is simulated and described.

[0133] See also Fig.23 , Fig.23A schematic diagram of the efficiency of a foldable electronic device provided in an embodiment when it is in an unfolded state. In the schematic diagram of this embodiment, the horizontal axis is frequency (Frequency), the unit is GHz; the vertical axis unit is dB. Among them, curve ① is the system radiation efficiency (System Rad.Efficiency) curve when the antenna component 20 of the foldable electronic device 1 does not include the second radiator 22, which is marked as System Rad.Efficiency without parasitics in the figure; curve ② is the system radiation efficiency curve when the antenna component 20 of the foldable electronic device 1 includes the second radiator 22, which is marked as System Rad.Efficiency with added parasitic branches in the figure; curve ③ is the system total efficiency (System Tot.Efficiency) curve when the antenna component 20 of the foldable electronic device 1 does not include the second radiator 22, which is marked as System Tot.Efficiency without parasitics in the figure; curve ④ is the system efficiency curve when the antenna component 20 of the foldable electronic device 1 includes the second radiator 22, which is marked as System Tot.Efficiency with added parasitic branches in the figure. It should be noted that when the antenna assembly 20 includes the first radiator 21 but not the second radiator 22, it can be regarded as the first radiator 21 in the antenna assembly 20 working alone. It can be seen from this simulation diagram that when the foldable electronic device 1 is in the unfolded state: the antenna assembly 20 includes the first radiator 21 and the second radiator 22, that is, it is equivalent to adding the second radiator 22 to the antenna assembly 20 including the first radiator 21, and the radiation efficiency and the total efficiency of the first frequency band supported by the antenna assembly 20 are improved.

[0134] See also Fig.24 , Fig.24This is a schematic diagram of the efficiency of a foldable electronic device in a folded state provided by an embodiment. In the schematic diagram of this embodiment, the horizontal axis is frequency (Frequency), the unit is GHz; the vertical axis unit is dB. Among them, curve ① represents the S parameter (S1,1); curve ② represents the system radiation efficiency (System Rad.Efficiency) curve of the antenna component 20 of the foldable electronic device 1; curve ③ is the system total efficiency (System Tot.Efficiency) curve of the antenna component 20 of the foldable electronic device 1. It can be seen from curve ① that the foldable electronic device 1 has three resonant modes when it is in a folded state, from left to right: the third resonant mode, the second resonant mode and the fourth resonant mode. It can be seen from this simulation diagram that in this embodiment, the first frequency band supported by the second resonant mode is the N28 frequency band. The first frequency band has a higher system radiation efficiency and system total efficiency. The system radiation efficiency of the third resonant mode (i.e., the first mode from the left) is less than the system radiation efficiency of the second resonant mode, and the system total efficiency of the third resonant mode is less than the system total efficiency of the second resonant mode. The specific reasons are analyzed as follows. Generally speaking, the first body 11 and the second body 13 are conductive, and therefore, the first body 11 and the second body 13 can be used as the ground (e.g., main ground) of the foldable electronic device 1. When the foldable electronic device 1 is in an unfolded state, the ground of the foldable electronic device 1 is relatively large. When the foldable electronic device 1 is in a folded state, the first body 11 and the second body 13 are folded up, and the ground of the foldable electronic device 1 becomes smaller. When the first body 11 and the second body 13 are equal or approximately equal in size, the ground of the foldable electronic device 1 in the folded state is halved compared to the ground of the foldable electronic device 1 in the unfolded state. Affected by the halving of the ground of the foldable electronic device 1, the total system efficiency and system radiation efficiency of the mode supported by the first radiator 21 (i.e., the third resonance mode) are both reduced. At this time, the second radiator 22 serves as the main radiating branch supporting the first frequency band. For example, the electrical length of the second radiator 22 itself can support the first frequency band, or at least one of the first matching circuit M1 and the second matching circuit M2 is adjusted (for example, the switch in the corresponding matching antenna is switched to adjust the matching device loaded to the corresponding radiator) so that the second radiator 22 serves as the main radiating branch supporting the first frequency band. It can be seen from this simulation diagram that when the foldable electronic device 1 is in a folded state, using the second radiator 22 as the main radiating branch supporting the first frequency band has a higher system radiation efficiency and a higher system total efficiency.

[0135] See also Fig.25 , Fig.25A schematic diagram of simulation curves of S parameters, system total efficiency and system radiation efficiency of a foldable electronic device in a folded state provided by an embodiment. In this simulation diagram, the horizontal axis is frequency (Frequency), in GHz; the vertical axis is in dB. Among them, curve ① is a schematic diagram of the curve of the S parameter (S1,1) when the foldable electronic device 1 is in a folded state; curve ①' is a schematic diagram of the S parameter (S1,1) curve when the foldable electronic device 1 is in a folded state and there is no second radiator 22 (referred to as no parasitic); curve ② is a system radiation efficiency (System Rad.Efficiency) curve when the foldable electronic device 1 is in a folded state, and curve ②' is the system radiation efficiency when the foldable electronic device 1 is in a folded state and there is no parasitic; curve ③ is a system total efficiency (System Tot.Efficiency) curve when the foldable electronic device 1 is in a folded state, and curve ③' is a system total efficiency curve when the foldable electronic device 1 is in a folded state and there is no parasitic. It can be seen from the simulation diagram that the total system radiation efficiency of the foldable electronic device 1 provided in this embodiment when it is in a folded state is improved by about 3dB (specifically, the absolute value of the difference between -7.003302 and -3.4836598) compared with the total system radiation efficiency of the foldable electronic device 1 without parasitics when it is in a folded state.

[0136] See also Fig.26 , Fig.26 A schematic diagram of the simulation curves of the total system efficiency and the system radiation efficiency of a foldable electronic device in an unfolded state and a folded state provided by an embodiment. Among them, curve ① is the system radiation efficiency (System Rad. Efficiency) curve of the foldable electronic device 1 in the unfolded state, and curve ② is the system radiation efficiency of the foldable electronic device 1 in the folded state; curve ①' is the system total efficiency (System Tot. Efficiency) curve of the foldable electronic device 1 in the unfolded state, and curve ②' is the system total efficiency curve of the foldable electronic device 1 in the folded state. It can be seen that the efficiency of the foldable electronic device 1 in the unfolded state and in the first frequency band (taking the N28 frequency band, the resonant frequency is 0.75GHz as an example) is -4.2dB, and the efficiency of the foldable electronic device 1 in the folded state and in the first frequency band (taking the N28 frequency band, the resonant frequency is 0.75GHz as an example) is -7.2dB, and the efficiency decreases by 3dB, which is much better than the 6dB to 10dB decrease in efficiency generally observed in the related art.

[0137] To summarize, the antenna assembly 20 of the foldable electronic device 1 provided in the embodiment of the present application increases the efficiency of the first frequency band of the preset frequency band range of the foldable electronic device 1 in the folding scenario by adding a second radiator 22 (also called a parasitic branch), and utilizing the second radiator 22 as the main radiating branch when the foldable electronic device 1 is in a folded state, thereby significantly reducing the efficiency drop of the first frequency band (such as the N28 band) of the preset frequency band range (such as the LB band).

[0138] In one embodiment, the length of the second radiator 22 (also called a parasitic branch) is relatively long. By adding a longer second radiator 22 and switching the matching devices in at least one of the first matching circuit M1 and the second matching circuit M2, and using the second radiator 22 as the main radiation branch when the foldable electronic device 1 is in a folded state, the efficiency of the first frequency band (such as the N28 band) of the preset frequency band range (such as the LB band) of the foldable electronic device 1 in the folding scenario can be improved, and the efficiency reduction of the first frequency band of the preset frequency band range can be significantly reduced.

[0139] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A foldable electronic device, characterized in that: The foldable electronic device comprises a foldable body and an antenna assembly, wherein the foldable body comprises a foldable first body and a foldable second body, so that the foldable electronic device can be in a folded state and an unfolded state; the antenna assembly comprises: A first radiator is arranged corresponding to the first body, and the first radiator has a feeding point; a feed source electrically connected to the feed point; and A second radiator is arranged corresponding to the second body; When the foldable electronic device is in an unfolded state, the first radiator and the second radiator are located on the same side of the foldable electronic device, and the first radiator is excited to generate a first resonance mode, wherein the first resonance mode supports a first frequency band within a preset frequency band range; When the foldable electronic device is in a folded state, the second radiator is at least partially stacked and coupled with the first radiator, and the first radiator and the second radiator are excited to generate a second resonance mode, wherein the second radiator is excited to generate a first resonance current, and the first radiator is excited to generate a second resonance current that is opposite to the first resonance current, and the current value of the second resonance current is smaller than the current value of the first resonance current, and the second resonance mode supports the first frequency band within the preset frequency band range.

2. The foldable electronic device according to claim 1, characterized in that: The first radiator comprises a first grounding end and a first free end, the first grounding end is grounded, the feeding point is located between the first grounding end and the first free end, and the first grounding end is farther away from the second body than the first free end; The second radiator includes a second ground end and a second free end, the second ground end is grounded, and the second ground end is closer to the first free end than the second free end; When the foldable electronic device is in a folded state: the second free end is set corresponding to the first ground end, the second ground end is set corresponding to the first free end, and a coupling gap is formed between the second radiator and the first radiator, and in the direction from the first body to the second body, the size W of the coupling gap satisfies: 0.5mm≤W≤4.0mm.

3. The foldable electronic device according to claim 2, characterized in that: When the first radiator and the second radiator are excited to generate a second resonance mode, the second resonance mode includes a quarter wavelength mode of the second radiator.

4. The foldable electronic device according to claim 2, characterized in that: When the foldable electronic device is in a folded state, the first radiator and the second radiator are excited to support a third resonance mode within the preset frequency band range, wherein the resonance frequency point of the resonance frequency band supported by the third resonance mode is located in the preset frequency band and is less than the resonance frequency point corresponding to the second resonance mode.

5. The foldable electronic device according to claim 4, characterized in that: When the first radiator and the second radiator are excited to generate a third resonance mode, the third resonance mode includes a quarter wavelength mode of the first radiator.

6. The foldable electronic device according to claim 5, characterized in that: When the first radiator and the second radiator are excited to support the third resonant mode within the preset frequency band, the first radiator is excited to generate a third resonant current, and the second radiator is excited to generate a fourth resonant current that is opposite to the third resonant current, and a current value of the fourth resonant current is less than a current value of the first resonant current.

7. The electronic device according to claim 4, characterized in that: The foldable electronic device also includes a floor. When the foldable electronic device is in a folded state, the antenna assembly also supports a fourth resonance mode, wherein the resonance frequency band supported by the fourth resonance mode is located in the preset frequency band, and the fourth resonance mode is a characteristic mode of the floor.

8. The electronic device according to claim 7, characterized in that: The resonant current corresponding to the characteristic mode of the floor flows in the direction along the length of the foldable electronic device and is a half-wavelength characteristic mode.

9. The foldable electronic device according to claim 2, wherein: The first resonance mode is a quarter-wavelength mode of the first radiator.

10. The foldable electronic device according to claim 2, characterized in that: When the foldable electronic device is in an unfolded state, the second ground end is separated from the first free end by a coupling gap, the second radiator is coupled to the first radiator through the coupling gap, the second radiator is excited to support a fifth resonance mode within the preset frequency band, and the resonance frequency of the fifth resonance mode is lower than the resonance frequency of the first resonance mode.

11. The foldable electronic device according to claim 10, characterized in that: The fifth resonance mode is a quarter-wavelength mode of the second radiator.

12. The foldable electronic device according to claim 2, characterized in that: When the foldable electronic device is in an unfolded state, a dimension d of the coupling gap along an arrangement direction of the first body and the second body satisfies: 5 mm ≤ d ≤ 10 mm.

13. The foldable electronic device according to claim 2, characterized in that: The antenna assembly further comprises: a first matching circuit, one end of the first matching circuit being electrically connected to the feeding point, the other end of the first matching circuit being electrically connected to a feed source, and the first matching circuit being used to adjust the electrical length of the first radiator; and A second matching circuit, one end of the second matching circuit is electrically connected to the second ground end, the other end of the second matching circuit is grounded, and the second matching circuit is used to adjust the electrical length of the second radiator.

14. The foldable electronic device according to claim 13, characterized in that: The matching subcircuit in the first matching circuit or the matching subcircuit in the second matching circuit further includes one or more of the following circuits: A bandpass circuit formed by connecting an inductor and a capacitor in series; A resistance circuit formed by connecting an inductor and a capacitor in parallel; an inductor, a first capacitor, and a second capacitor, wherein the inductor is connected in parallel with the first capacitor, and the second capacitor is electrically connected to a node where the inductor and the first capacitor are electrically connected; A capacitor, a first inductor, and a second inductor, wherein the capacitor is connected in parallel with the first inductor, and the second inductor is electrically connected to a node where the capacitor and the first inductor are electrically connected; an inductor, a first capacitor, and a second capacitor, wherein the inductor is connected in series with the first capacitor, one end of the second capacitor is electrically connected to the first end of the inductor that is not connected to the first capacitor, and the other end of the second capacitor is electrically connected to the end of the first capacitor that is not connected to the inductor; A capacitor, a first inductor, and a second inductor, wherein the capacitor is connected in series with the first inductor, one end of the second inductor is electrically connected to an end of the capacitor that is not connected to the first inductor, and the other end of the second inductor is electrically connected to an end of the first inductor that is not connected to the capacitor; A first capacitor, a second capacitor, a first inductor, and a second inductor, wherein the first capacitor is connected in parallel with the first inductor, the second capacitor is connected in parallel with the second inductor, and one end of a whole formed by the second capacitor and the second inductor in parallel is electrically connected to one end of a whole formed by the first capacitor and the first inductor in parallel; A first capacitor, a second capacitor, a first inductor, and a second inductor, the first capacitor and the first inductor are connected in series to form a first unit, the second capacitor and the second inductor are connected in series to form a second unit, and the first unit and the second unit are connected in parallel.

15. The foldable electronic device according to claim 13, characterized in that: The first matching circuit includes a switch and a matching subcircuit, wherein the matching subcircuit is connected in series with the switch to form a series unit, one end of the series unit is electrically connected to the feeding point, and the other end of the series unit is grounded; When the foldable electronic device is in an unfolded state, the switch is disconnected, and the first radiator is excited to generate a first resonance mode; When the foldable electronic device is in a folded state, the switch is turned on and the second radiator is excited to generate the first resonant current.

16. The foldable electronic device according to claim 1, wherein: The preset frequency band range is the LB frequency band, and the first frequency band is the N28 frequency band.

17. The foldable electronic device according to claim 1, wherein: Both the first body and the second body are conductive structures. When the foldable body is in an unfolded state: the first body is electrically connected to the second body, the first body and the second body constitute a radiating arm of a dipole antenna, and the other radiating arm of the dipole antenna includes at least the first radiator, wherein the dipole antenna supports the first frequency band.

18. The foldable electronic device according to claim 1, wherein: When the foldable electronic device is in an unfolded state and the antenna assembly supports the first frequency band, the SAR value of the foldable electronic device is a first SAR value; When the foldable electronic device is in a folded state and the antenna assembly supports the first frequency band, the SAR value of the foldable electronic device is a second SAR value, wherein the second SAR value is less than the first SAR value.

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