Foldable electronic device

Abstract

The application discloses a foldable electronic device, a main radiator is arranged on a first extending edge of a foldable main body, the main radiator comprises a first free end and a feed point which are arranged at intervals; a signal source is electrically connected with the feed point, and is used for feeding an excitation current into the main radiator; at least part of a first parasitic radiator is arranged on the first extending edge of the foldable main body, the first parasitic radiator comprises a second free end and a first grounding point, and a first coupling gap is formed between the second free end and the first free end; a second parasitic radiator is arranged on a second extending edge, the second parasitic radiator comprises a third free end and a second grounding point, when the foldable main body is in a folded state, a direction in which the feed point points to the first free end is opposite to a direction in which the second grounding point points to the third free end, and in a thickness direction of the foldable main body, the second parasitic radiator is opposite to and coupled with at least part of the main radiator. The application can improve the antenna performance of the foldable electronic device when being folded.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically to a foldable electronic device. Background Technology

[0002] Electronic devices with unfolded and folded configurations are gaining increasing attention due to their large displays when unfolded and their small footprint and portability when folded. However, the performance of some antennas deteriorates significantly when folded, impacting user experience. Therefore, improving the antenna performance of foldable electronic devices during both unfolding and folding modes has become a key technical challenge. Summary of the Invention

[0003] This application provides a foldable electronic device that can improve antenna performance when folded and unfolded.

[0004] This application provides a foldable electronic device, including a foldable body and an antenna assembly. The foldable body includes a first body and a second body. The first body and the second body are movably connected to present a folded state or an unfolded state. The first body includes a first extension edge, and the second body includes a second extension edge. When the foldable body is in the folded state, the first extension edge and the second extension edge are opposite to each other in the thickness direction of the foldable body.

[0005] The antenna assembly includes:

[0006] A main radiator is disposed on the first extended side, and the main radiator includes a first free end and a feed point that are spaced apart.

[0007] A signal source, which is electrically connected to the feed point, is used to feed an excitation current into the main radiator.

[0008] A first parasitic radiator is at least partially disposed on the first extension edge. The first parasitic radiator includes a second free end and a first grounding point. A first coupling gap is formed between the second free end and the first free end. The first parasitic radiator is coupled to the main radiator through the first coupling gap.

[0009] The second parasitic radiator is disposed on the second extended side. The second parasitic radiator includes a third free end and a second grounding point. When the foldable body is in a folded state, the direction of the feed point pointing to the first free end is opposite to the direction of the second grounding point pointing to the third free end. In the thickness direction of the foldable body, the second parasitic radiator is at least partially opposite and coupled to the main radiator.

[0010] The foldable electronic device provided in this application embodiment comprises a main radiator disposed on a first extension edge of a first main body, the main radiator including a first free end and a feed point spaced apart; a signal source electrically connected to the feed point, the signal source being used to feed an excitation current to the main radiator; at least a portion of a first parasitic radiator disposed on the first extension edge of the first main body, the first parasitic radiator including a second free end and a first ground point, a first coupling gap forming between the second free end and the first free end, the first parasitic radiator being coupled to the main radiator through the first coupling gap; and a second parasitic radiator disposed on a second extension edge of a second main body, the second parasitic radiator including a third free end and a second ground point. The foldable main body... When the body is in a folded state, the direction of the feed point pointing to the first free end is opposite to the direction of the second ground point pointing to the third free end. In the thickness direction of the foldable body, the second parasitic radiator is at least partially opposite and coupled to the main radiator. By setting the first parasitic radiator and the second parasitic radiator, wherein the first parasitic radiator is coupled to the main radiator in the unfolded state to generate a resonant mode to cover the required frequency band, and the direction of the free end of the second parasitic radiator is opposite to the direction of the free end of the main radiator, and it can be coupled to the main radiator in the folded state to generate a resonant mode to cover the required frequency band and improve efficiency, thereby improving the antenna performance of the foldable electronic device when folded and unfolded. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

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

[0013] Figure 2 This is a schematic diagram of a partially disassembled structure of the foldable electronic device provided in an embodiment of this application;

[0014] Figure 3 This is a schematic diagram of the sliding folding structure of the first main body and the second main body in the foldable electronic device provided in the embodiments of this application;

[0015] Figure 4 This is a schematic diagram of the structure of the first main body and the second main body of the foldable electronic device provided in the embodiments of this application, showing their rotational folding.

[0016] Figure 5 This is a schematic diagram of the first antenna assembly provided in the embodiments of this application in its deployed state;

[0017] Figure 6 yes Figure 5 A 3D structural diagram of the provided antenna assembly when folded;

[0018] Figure 7 yes Figure 5 Side view of the provided antenna assembly when folded;

[0019] Figure 8 This is a schematic diagram of a second position of the antenna assembly provided in an embodiment of this application;

[0020] Figure 9 This is a schematic diagram of a third position of the antenna assembly provided in the embodiments of this application;

[0021] Figure 10 This is a schematic diagram of the structure of the second antenna assembly provided in the embodiments of this application;

[0022] Figure 11 This is a schematic diagram of the structure of the third antenna assembly provided in the embodiments of this application;

[0023] Figure 12 This is a current distribution diagram of the first resonant mode of the first antenna assembly provided in the embodiments of this application when deployed;

[0024] Figure 13 This is a current distribution diagram of the second resonant mode of the first antenna assembly provided in this application embodiment when deployed;

[0025] Figure 14 This is a current distribution diagram of the third resonant mode of the first antenna assembly provided in this application embodiment when folded;

[0026] Figure 15 This is a current distribution diagram of the fourth resonant mode of the first antenna assembly provided in this application embodiment when folded;

[0027] Figure 16 This is a first type of control circuit block diagram provided in the embodiments of this application;

[0028] Figure 17 This is a schematic diagram of the detection circuit provided in this application being electrically connected to the main radiator;

[0029] Figure 18 This is a schematic diagram of the detection circuit provided in this application being electrically connected to the first parasitic radiator;

[0030] Figure 19 This is a schematic diagram of the detection circuit provided in this application being electrically connected to the second parasitic radiator;

[0031] Figure 20 This is a second control circuit block diagram provided in the embodiments of this application;

[0032] Figure 21The S-parameter curves of the antenna assembly of the foldable electronic device provided in this application embodiment are shown in the following states: unfolded state, folded state with the first switch circuit in the on state and the second switch circuit in the off state, folded state with the first switch circuit in the off state and the second switch circuit in the closed state, and folded state with both the first switch circuit and the second switch circuit in the on state.

[0033] Figure 22 and Figure 23 This is a current distribution diagram of the working mode of the foldable electronic device provided in this application embodiment, where the first switching circuit is in the on state and the second switching circuit is in the off state when the device is folded.

[0034] Figure 24 and Figure 25 This is a current distribution diagram of the working mode when the first and second switching circuits of the foldable electronic device provided in this application are simultaneously in the on state when folded;

[0035] Figure 26 This is a comparison chart of the efficiency of the antenna assembly provided in the embodiments of this application and the antenna assembly opposite the slot.

[0036] Explanation of icon numbers:

[0037] Foldable electronic device 1000; foldable main body 10; antenna assembly 100; first main body 11; second main body 13; first housing 41; second housing 42; flexible display screen 200; first fixing part 210; bending part 220; second fixing part 230; first connecting edge 112; first free edge 111; first side edge 113; second side edge 114; second connecting edge 132; second free edge 131; third side edge 133; fourth side edge 134; electrical connector 12; first free end A; feed point B; matching circuit M1; second free end C; first ground point D; third free end E; second ground point F; connection point G; controller 40; first switching circuit SW1; second switching circuit SW2; detection module 50; first detector 51; second detector 52; detection circuit 60; third switching circuit SW3; matching circuit M1; first tuning circuit M2; second tuning circuit M3. Detailed Implementation

[0038] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0039] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0040] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0041] Please see Figure 1 , Figure 1 This is a schematic diagram of a foldable electronic device provided in an embodiment of this application. The foldable electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablets, laptops, computers, wearable devices, and drones that can be folded or unfolded. This embodiment uses a mobile phone as an example for illustration; other electronic devices can refer to this embodiment.

[0042] For ease of description, please refer to Figure 2 The thickness direction of the foldable electronic device 1000 is defined as the Z-axis, the length direction as the Y-axis, and the width direction as the X-axis, with the Z, Y, and X axes being perpendicular to each other. This application does not limit the dimensions of the foldable electronic device 1000 in the length and width directions. In some embodiments, the dimension of the foldable electronic device 1000 in the length direction is larger than its dimension in the width direction; in other embodiments, the dimension of the foldable electronic device 1000 in the width direction is greater than or equal to its dimension in the length direction.

[0043] Please see Figure 3 The foldable electronic device 1000 provided in this application embodiment includes at least a foldable body 10 and an antenna assembly 100.

[0044] Please see Figure 3The 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 embodiments of this application, the movable connection is not limited to a sliding connection, a rotational connection, or a combination of rotation and sliding, etc., so that the first body 11 and the second body 13 change from a folded state to an unfolded state, or from an unfolded state to a folded state.

[0045] The following examples, with reference to the accompanying drawings, illustrate the environment in which the foldable electronic device 100, the foldable main body 10, and the antenna assembly 100 are located.

[0046] Please see Figure 2 The foldable electronic device 1000 also includes a first housing 41 and a second housing 42. The first housing 41 covers the outside of the first main body 11, and the second housing 42 covers the outside of the second main body 13. Each housing includes a base plate (also referred to as a back cover) and a frame surrounding the periphery of the base plate. The base plate and the periphery of the frame form a receiving space. The radiator of the antenna assembly 100 can be part of the frame. The first main body 11 is disposed on the base plate of the first housing 41 (received within the first housing), and the second main body 13 is disposed on the base plate of the second housing 42 (received within the second housing). The receiving space is also used to receive devices such as a motherboard, a camera module, a receiver module, a battery, and various sensors. The foldable main body 10 is made of a conductive metallic material. This application is not limited to the shape of the first main body 11 and the second main body 13. Optionally, the first main body 11 may be generally rectangular, and the second main body 13 may be generally rectangular. Their shapes are not specifically limited, including but not limited to rectangles, squares, irregular shapes, etc. The foldable body 10 has through holes, notches, slots, etc., to accommodate devices.

[0047] This application does not specifically limit the foldable body 10. Optionally, the foldable body 10 may include, but is not limited to, a middle plate inside the middle frame of the foldable electronic device 1000. This middle plate is used to support circuit boards, form receiving slots for electronic devices, and provide clearance. The middle plate can be made of metal, non-metal, or a combination of metal and non-metal materials. When the middle plate is made of metal, such as magnesium-aluminum alloy, it can also serve as a reference ground system for the foldable electronic device 1000.

[0048] In other embodiments, the floor and frame are separate structures. The middle plate and frame are interconnected as a single unit.

[0049] The foldable body 10 includes a folded state and an unfolded state. In the folded state, the first body 11 and the second body 13 are superimposed in the thickness direction (Z-axis direction), specifically, the first body 11 and the second body 13 are respectively disposed on the upper and lower layers along the Z-axis direction.

[0050] When unfolded, the first main body 11 is moved from the folded state to a position where the overlapping area between it and the second main body 13 is less than a preset area. The preset area is, for example, 20%, 15%, 10%, 5%, 1%, or 0% of the area of ​​the first main body 11. In this case, the foldable electronic device 1000 is, but is not limited to, a slider phone.

[0051] Please see Figure 3 The first body 11 and the second body 13 are slidably connected by a slide rail. For example, the slide rail extends along the Y-axis. The first body 11 and / or the second body 13 slide along the extension direction of the slide rail to a folded state or an unfolded state. The first body 11 is located... Figure 3 The solid line indicates a folded state, and the first main body 11 is located in... Figure 3 The middle dashed line indicates the expanded state.

[0052] The unfolded state can also be such that the first main body 11 flips from the folded state to a state where the overlapping area between it and the second main body 13 is less than a preset area. The preset area is, for example, 20%, 15%, 10%, 5%, 1%, 0% of the area of ​​the first main body 11. In this case, the foldable electronic device 1000 includes, but is not limited to, a foldable mobile phone.

[0053] Please see Figure 4 The first body 11 and the second body 13 are rotatably connected via a pivot. The axis of the pivot is the X-axis. The first body 11 and / or the second body 13 can rotate around the pivot to a folded or unfolded state. The first body 11 is located... Figure 4 The solid line indicates a folded state, and the first main body 11 is located in... Figure 4 The middle dashed line indicates the expanded state.

[0054] This application uses the example of a rotating connection between the first body 11 and the second body 13 to illustrate the concept.

[0055] Please see Figure 2The electronic device 1000 also includes a flexible display screen 200. The flexible display screen 200 is located on the front side of the foldable main body 10 (the front side refers to the direction facing the user when the flexible display screen 200 is in normal use). The flexible display screen 200 includes a first fixing part 210, a bending part 220, and a second fixing part 230 arranged sequentially. The first fixing part 210 is fixedly connected to the first housing 41, and the second fixing part 230 is fixedly connected to the second housing 42; the fixing method includes, but is not limited to, adhesive bonding. The bending part 220 is located on the rotating connecting mechanism; the connection between the two can be a fixed connection or a non-connected state. When the foldable electronic device 1000 is in use, the bending part 220 bends, and its bending shape includes, but is not limited to, a teardrop shape or a U-shape.

[0056] The above is an explanation of the foldable electronic device 1000, which includes slider phones and flip phones.

[0057] Please see Figure 5 The first body 11 includes a first connecting edge 112 and a first free edge 111 arranged opposite to each other. The first body 11 is generally rectangular. The first connecting edge 112 and the first free edge 111 are the two ends along the Y-axis direction, respectively. The first body 11 also includes a first side edge 113 and a second side edge 114 arranged opposite to each other and 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 the two ends along the X-axis direction, respectively.

[0058] Please see Figure 5 The second main body 13 includes a second connecting edge 132 and a second free edge 131 arranged opposite to each other. The second main body 13 is generally rectangular. The second connecting edge 132 and the second free edge 131 are the two ends along the Y-axis. The second main body 13 also includes a third side edge 133 and a fourth side edge 134 arranged opposite to each other and 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 the two ends along the X-axis.

[0059] Please see Figure 5 Both the first body 11 and the second body 13 are conductive components. That is, both the first body 11 and the second body 13 are conductive structures. When the first body 11 and the second body 13 are folded, they are positioned opposite each other and close to each other, forming a capacitor structure between them. The first body 11 and the second body 13 resemble two close conductive plates.

[0060] In one embodiment, the first connecting edge 112 and the second connecting edge 132 are rotatably electrically connected via an 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 together. 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.

[0061] Please see Figure 5 When unfolded, the first side 113 and the third side 133 are collinear, and the second side 114 and the fourth side 134 are collinear. When folded, the first side 113 and the third side 133 are aligned and spaced apart; the second side 114 and the fourth side 134 are aligned and spaced apart; and the first free edge and the second free edge are aligned and spaced apart.

[0062] Please see Figure 6 and Figure 7 When folded, the first free edge 111 and the second free edge 131 form an open circuit, while the first connecting edge 112 and the second connecting edge 132 form a short circuit. The foldable body 10 forms a slit cavity structure with openings on three sides (i.e., open circuit ends) and a short circuit end on one side.

[0063] Please see Figure 7 After folding, the first free edge 111 of the first main body 11 and the second free edge 131 of the second main body 13 are separated by a small distance d, where d ranges from 0.5mm to 4mm, but is not limited to this value. During folding, a first gap is formed between the first side 113 and the third side 133. A second gap is formed between the first free edge 111 and the second free edge 131, and a third gap is formed between the second side 114 and the fourth side 134. During folding, the foldable main body 10 can form a gap cavity structure with gaps (open circuits) on three sides and a short circuit on one side.

[0064] In another embodiment, the connector between the first connecting edge 112 and the second connecting edge 132 is an insulated connection.

[0065] The following description, in conjunction with the accompanying drawings, provides specific examples illustrating the placement of the antenna assembly 100 provided in the embodiments of this application.

[0066] Please see Figure 5 The antenna assembly 100 includes at least a main radiator 21, a first parasitic radiator 22, a second parasitic radiator 23, and a signal source 24.

[0067] Please see Figure 5The first body 11 includes a first extended edge. Figure 5 The first extended edge is the second side edge 114. The second main body 13 includes the second extended edge. Figure 5 The second extended edge is the fourth side edge 134. When the first main body 11 and the second main body 13 are in a folded state (i.e., when the foldable main body 10 is in a folded state), the first extended edge and the second extended edge are opposite each other in the thickness direction of the foldable main body 10. The thickness direction of the foldable main body 10 is parallel to the direction from the first main body 11 to the second main body 13 in the folded state.

[0068] The main radiator 21 is disposed on the first extending edge. The first parasitic radiator 22 is at least partially disposed on the first extending edge. In other words, the main radiator 21 and the first parasitic radiator 22 are at least partially disposed on the same side of the first main body 11. The second parasitic radiator 23 is disposed on the second extending edge.

[0069] Optional, please refer to Figure 8 The first extended edge can be one of the first side 113 and the third side 133, and the second extended edge can be the other of the first side 113 and the third side 133.

[0070] Alternatively, please refer to Figure 5 The first extended edge can be one of the second side 114 and the fourth side 134, and the second extended edge can be the other of the second side 114 and the fourth side 134.

[0071] Alternatively, please refer to Figure 9 The first extended edge can be one of the first free edge 111 and the second free edge 131, and the second extended edge can be the other of the first free edge 111 and the second free edge 131.

[0072] Optionally, the first main body 11 is the upper half of the foldable electronic device 1000, and the second main body 13 is the lower half of the foldable electronic device 1000. When the foldable electronic device 1000 is in the unfolded portrait mode, the lower half of the foldable electronic device 1000 faces the ground.

[0073] The specific structure of the antenna assembly 100 provided in the embodiments of this application will be specifically illustrated below with reference to the accompanying drawings. The antenna assembly 100 provided in this application can be used in embodiments where the first main body 11 and the second main body 13 are electrically connected or non-electrically connected. Taking the example of the main radiator 21 and the first parasitic radiator 22 being disposed on the second side 114 and the second parasitic radiator 23 being disposed on the fourth side 134, the description will be provided.

[0074] Please see Figure 5The main radiator 21 is disposed on the first main body 11. Optionally, the main radiator 21 is disposed on one side of the first main body 11. The orthographic projection of the main radiator 21 in the thickness direction does not overlap with the orthographic projection of the first main body 11 in the thickness direction. Taking the first extended edge as the second side edge 114 as an example, the main radiator 21 is disposed along the second side edge 114.

[0075] The main radiator 21 is made of a conductive material, including but not limited to metals, alloys, conductive oxides, conductive polymers, graphene, etc. The form of the main radiator 21 includes, but is not limited to, the metal frame of a mobile phone, a metal frame embedded in a plastic frame, a metal radiator located inside or on the surface of a frame, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser-directly formed antenna (LDS), a printed-directly formed antenna (PDS), a conductive sheet antenna (e.g., a metal bracket antenna), etc. In this embodiment, the main radiator 21 is taken as an example of the metal frame of a mobile phone.

[0076] Optionally, this application does not specifically limit the shape of the main radiator 21. For example, the shape of the main radiator 21 includes, but is not limited to, strip, sheet, rod, coating, or film. Figure 5 The main radiator 21 shown is merely an example and does not limit the shape of the main radiator 21 provided in this application. In this embodiment, the main radiator 21 is strip-shaped. This application does not limit the extension trajectory of the main radiator 21. In this embodiment, the main radiator 21 is straight. In other embodiments, the main radiator 21 may also extend in a bent, curved, or other trajectory. The main radiator 21 described above may be a line of uniform width on its extension trajectory, or it may be a strip of varying width, such as one with gradually changing width or widened areas. In this embodiment, the main radiator 21 is generally strip-shaped.

[0077] Please see Figure 5 The main radiator 21 includes a first free end A and a feed point B spaced apart. The first free end A is the end where other conductive structures are physically disconnected. This application does not specifically describe the location of the feed point B on the main radiator 21. Optionally, the feed point B can be the other end of the main radiator 21, or located between the two ends. The specific location of the feed point B will be described in detail in subsequent embodiments.

[0078] Signal source 24 is electrically connected to feed point B. The signal source 24 is electrically connected to feed excitation current to the main radiator 21.

[0079] Optionally, the signal source 24 includes, but is not limited to, radio frequency transceiver chips. The signal source 24 is used to transmit radio frequency signals (radio frequency current). The radio frequency signals are transmitted to the main radiator 21 to excite the main radiator 21 to generate a resonant current, forming a resonant mode, so as to receive or transmit electromagnetic wave signals covering the required frequency band, covering the frequency band corresponding to the resonant current.

[0080] In this embodiment, the signal source 24 is mounted on the motherboard. The motherboard is mounted on the foldable body 10. The electrical connection between the signal source 24 and the feed point B includes, but is not limited to, methods such as through conductive springs, soldering, coaxial cables, microstrip lines, and conductive adhesive. Specifically, the signal source 24 is electrically connected to the feed point B through a feed spring (conductive spring) mounted on the motherboard.

[0081] Optional, please refer to Figure 5 The foldable electronic device 1000 further includes a matching circuit M1, which is electrically connected between the feed point B and the signal source 24. The matching circuit M1 is used to achieve impedance matching between the signal source 24 and the radiator, thereby exciting a resonant mode. The matching circuit M1 includes, but is not limited to, capacitors and inductors.

[0082] Specifically, the matching circuit M1 may include, but is not limited to, a capacitor, an inductor, a series connection of a capacitor and an inductor, a parallel connection of a capacitor and an inductor, a series connection of the above-mentioned components in parallel with a capacitor, a series connection of the above-mentioned components in parallel with an inductor, two series connections of the above-mentioned components in parallel, two parallel connections of the above-mentioned components in series, and so on.

[0083] Please see Figure 5 A first parasitic radiator 22 is disposed on a first main body 11. The structure, shape, and material of the first parasitic radiator 22 are similar to those of the main radiator 21. The positional relationship between the first parasitic radiator 22 and the first main body 11 can be referenced to the positional relationship between the main radiator 21 and the first main body 11. Optionally, the first parasitic radiator 22 may be part of a frame. With the first extending edge as the second side edge 114, at least a portion of the first parasitic radiator 22 is disposed along the second side edge 114. Optionally, the main radiator 21 may be closer to the first connecting edge 112 relative to the first parasitic radiator 22. Further optionally, the first parasitic radiator 22 may be closer to the first connecting edge 112 relative to the main radiator 21.

[0084] Please see Figure 5The first parasitic radiator 22 includes a second free end C and a first grounding point D. A first coupling gap is formed between the second free end C and the first free end A. The first parasitic radiator 22 is coupled to the main radiator 21 through the first coupling gap. The second free end C is the end that is physically disconnected from other conductive structures. The distance between the first free end A and the second free end C is approximately 0.5-2.5 mm, but is not limited to this data. When the main radiator 21 receives an excitation signal from the signal source 24, the second free end C of the first parasitic radiator 22 and the first free end A of the main radiator 21 form a capacitor, enabling the first parasitic radiator 22 to resonate under the excitation of the signal source 24.

[0085] Please see Figure 5 The first grounding point D is the end of the first parasitic radiator 22 furthest from the second free end C. The first grounding point D is grounded. When the first body 11 is a conductive element and is part of a reference ground system, the first grounding point D is electrically connected to the first body 11, wherein the electrical connection method includes, but is not limited to, through conductive springs, physical connection (interconnected as one unit), welding, through coaxial lines, through microstrip lines, through conductive adhesive, etc.

[0086] Please see Figure 5 The second parasitic radiator 23 is disposed on the second main body 13. The structure, shape, and material of the second parasitic radiator 23 are the same as those of the main radiator 21. The second parasitic radiator 23 is disposed on one side of the second main body 13. Optionally, the second parasitic radiator 23 is part of the frame, and the second parasitic radiator 23 is disposed along the fourth side 134.

[0087] Please see Figure 5 The second parasitic radiator 23 includes a third free end E and a second grounding point F. The third free end E is the end where other conductive structures are physically disconnected.

[0088] When the foldable body 10 is in a folded state, the direction of the power supply point B pointing to the first free end A is opposite to the direction of the second grounding point F pointing to the third free end E.

[0089] Please see Figure 4 and Figure 5When the first body 11 and the second body 13 are in a folded state, the first body 11 and the second body 13 are stacked in the thickness direction. The orthographic projection of the main radiator 21 in the thickness direction of the foldable body 10 at least partially overlaps with the region where the second parasitic radiator 23 is located. The main radiator 21 and the second parasitic radiator 23 are spaced apart and coupled to each other. The direction of the feed point B pointing to the first free end A is opposite to the direction of the second ground point F pointing to the third free end E. That is, the free end of the main radiator 21 points opposite to the free end of the second parasitic radiator 23.

[0090] Specifically, the main radiator 21 is arranged parallel to the second side 114. The second parasitic radiator 23 is arranged parallel to the fourth side 134. When the first body 11 and the second body 13 are folded, the second side 114 and the fourth side 134 are aligned, and the extension direction of the main radiator 21 is parallel to the extension direction of the second parasitic radiator 23. A first opening is formed between the first free end A of the main radiator 21 and the second side 114, and a second opening is formed between the second free end C of the second parasitic radiator 23 and the fourth side 134. The orientation of the first opening and the orientation of the second opening are opposite when folded.

[0091] In this embodiment, both the first body 11 and the second body 13 are conductive structures. When the first body 11 and the second body 13 are folded, they form a capacitor structure with their surfaces facing each other and a small gap between them. When the signal source 24 excites the main radiator 21, a current distribution occurs on the capacitor structure formed by the first body 11 and the second body 13, creating an electric field between them (the direction of the electric field is either from the first body 11 to the second body 13, or from the second body 13 to the first body 11). The current flow direction on the first body 11 is opposite to that on the second body 13. For example, the current on the first body 11 flows from the first free edge 111 to the first connecting edge 112, while the current on the second body 13 flows from the second connecting edge 132 to the second free edge 131. That is, the first body 11 and the second body 13 generate currents in opposite directions. In the capacitor structure formed by the first body 11 and the second body 13, if the free ends of the main radiator 21 and the second parasitic radiator 23 point in the same direction, opposite currents will be generated between the main radiator 21 and the second parasitic radiator 23. These reverse currents not only cause the far-field energy to cancel each other out, leading to a decrease in the efficiency of the frequency band supported by the main radiator 21, but also prevent it from forming a resonant mode that improves efficiency.

[0092] This embodiment designs the free end of the main radiator 21 to point in the opposite direction to the free end of the second parasitic radiator 23. This conforms to the current distribution on the main radiator 21 and the second parasitic radiator 23 under the capacitor structure formed by the first body 11 and the second body 13, avoiding the formation of reverse currents on the main radiator 21 and the second parasitic radiator 23; it also facilitates the coupling of the main radiator 21 and the second parasitic radiator 23 and their joint formation of a resonant mode.

[0093] In the thickness direction of the foldable body 10, the second parasitic radiator 23 is at least partially opposite and coupled to the main radiator 21. The orthographic projection of the second parasitic radiator 23 in the thickness direction at least partially covers the area where the main radiator 21 is located. When the foldable body 10 is in a folded state, the second parasitic radiator 23 and the main radiator 21 are opposite and spaced apart in the thickness direction; this application does not specifically limit this spacing. When the signal source 24 excites a current to be generated on the main radiator 21, a capacitor structure is formed between the second parasitic radiator 23 and the main radiator 21, thus enabling the second parasitic radiator 23 to resonate under the excitation of the signal source 24.

[0094] When the foldable body 10 is in the unfolded state, the signal source 24 excites the main radiator 21 and the first parasitic radiator 22 to jointly form a resonant mode. At this time, the second parasitic radiator 23 cannot couple with the main radiator 21, and therefore cannot form a resonant mode with the main radiator 21. When the foldable body 10 is in the folded state, since both the first parasitic radiator 22 and the second parasitic radiator 23 are close to the main radiator 21, there are conditions for forming coupling capacitor structures between the first parasitic radiator 22 and the main radiator 21, and between the second parasitic radiator 23 and the main radiator 21. Therefore, when the foldable body 10 is in the folded state, one or both of the first parasitic radiator 22 and the second parasitic radiator 23 couple with the main radiator 21 to jointly form a resonant mode, thereby enhancing the frequency band supported by the main radiator 21.

[0095] The foldable electronic device 1000 provided in this application embodiment includes a main radiator 21 disposed on the first extended side of a first main body 11. The main radiator 21 includes a first free end A and a feed point B spaced apart. A signal source 24 is electrically connected to the feed point B and is used to excite a resonant mode on the main radiator 21. A first parasitic radiator 22 is at least partially disposed on the second side 114 of the first main body 11. The first parasitic radiator 22 includes a second free end C and a first ground point D. A first coupling gap is formed between the second free end C and the first free end A. The first parasitic radiator 22 can generate a resonant mode under the excitation of the signal source 24. A second parasitic radiator 23 is disposed on the second side 114 of the second main body 13. The second parasitic radiator 23 includes a third free end E and a second ground point F. The device is foldable. When the stack body 10 is in the folded state, the direction of the feed point B pointing to the first free end A is opposite to the direction of the second ground point F pointing to the third free end E. The second parasitic radiator 23 is at least partially opposite and coupled to the main radiator 21. The second parasitic radiator 23 can generate a resonant mode under the excitation of the signal source 24. By setting the first parasitic radiator 22 and the second parasitic radiator 23, wherein the first parasitic radiator 22 is coupled to the main radiator 21 in the unfolded state and generates a resonant mode to cover the required frequency band, and the direction of the free end of the second parasitic radiator 23 is opposite to the direction of the free end of the main radiator 21, and can be coupled to the main radiator 21 in the folded state to generate a resonant mode to cover the required frequency band and improve efficiency, the antenna performance of the foldable electronic device 1000 is improved when folded and unfolded.

[0096] This application does not specify the relative lengths of the main radiator 21 and the second parasitic radiator 23.

[0097] Please see Figure 7 In the folded state, the orthographic projection of the second grounding point F in the thickness direction of the foldable body 10 lies on the first parasitic radiator 22. The orthographic projection of the third free end E in the thickness direction of the foldable body 10 lies on the main radiator 21.

[0098] Specifically, when folded, the orthographic projection of the second grounding point F in the direction (i.e., the thickness direction) from the second extended side (fourth side 134) to the first extended side (second side 114) is located on the side of the second free end C away from the feed point B.

[0099] Specifically, the orthographic projection of the third free end E in the direction (i.e., the thickness direction) from the second extended side (fourth side 134) to the first extended side (second side 114) is located in the region where the main radiator 21 is located.

[0100] In other words, the main radiator 21 and the second parasitic radiator 23 are staggered in the direction of the first extending edge. That is, a part of the second parasitic radiator 23 faces the main radiator 21, and the other part of the second parasitic radiator 23 extends beyond the area facing the main radiator 21. In this embodiment, the other part of the second parasitic radiator 23 faces the first coupling gap and the first parasitic radiator 22, so that when a reverse current is formed on the second parasitic radiator 23 and the main radiator 21, the strong points of the reverse current on the second parasitic radiator 23 and the main radiator 21 will not face each other, thereby effectively avoiding the problem of the far-field energy of the reverse current on the main radiator 21 and the second parasitic radiator 23 canceling each other out when the strong points of the reverse current face each other.

[0101] Furthermore, the orthographic projection of the third free end E of the second parasitic radiator 23 onto the main radiator 21 is spaced apart from the end of the main radiator 21 away from the first free end A. The orthographic projection of the second grounding point F of the second parasitic radiator 23 onto the first parasitic radiator 22 is spaced apart from the first grounding point D.

[0102] In other words, the second grounding point F of the second parasitic radiator 23 is staggered from the first grounding point D of the first parasitic radiator 22 to avoid the strong points of the reverse current on the second parasitic radiator 23 and the first parasitic radiator 22 being directly opposite when reverse currents are formed on the second parasitic radiator 23 and the first parasitic radiator 22. This effectively avoids the problem of the far-field energy of the reverse currents on the first parasitic radiator 22 and the second parasitic radiator 23 canceling each other out when the strong points of the reverse currents are directly opposite.

[0103] When the second grounding point F and the third free end E of the second parasitic radiator 23 are directly opposite the area where the main radiator 21 is located, the main radiator 21 and the second parasitic radiator 23 cannot improve efficiency. When the second grounding point F of the second parasitic radiator 23 is directly opposite the side of the first free end A of the main radiator 21 away from the feed point B, and the third free end E of the second parasitic radiator 23 is located on the side of the main radiator 21 away from the second parasitic radiator 23, since the length of the second parasitic radiator 23 is greater than the length of the main radiator 21, the resonant frequency of the second parasitic radiator 23 is lower than the resonant frequency of the main radiator 21, and therefore cannot improve the efficiency of the main radiator 21.

[0104] The above design further avoids the current strength points being directly opposite when the main radiator 21 and the second parasitic radiator 23, and the main radiator 21 and the first parasitic radiator 22 form reverse currents. This effectively avoids the problem of the far-field energy of the reverse currents on the first parasitic radiator 22 and the main radiator 21, and the main radiator 21 and the second parasitic radiator 23 canceling each other out.

[0105] This application does not specify the type of the main radiator 21. The following examples, in conjunction with the accompanying drawings, illustrate the specific type of the main radiator 21 and the corresponding resonant modes.

[0106] Please see Figure 5 and Figure 7 The main radiator 21 further includes a connection point G. The connection point G is located at the end of the main radiator 21 away from the first free end A and / or the connection point G is the feed point B.

[0107] In the first implementation, please refer to Figure 5 Connection point G is located at the end of the main radiator 21 furthest from the first free end A, and feed point B is located between connection point G and the first free end A, with connection point G grounded. That is, the main radiator 21 also includes a third grounding point ( Figure 5 The connection point G in the diagram is located at the third grounding point, which is located at the opposite ends of the main radiator 21, and the feed point B is located between the third grounding point and the first free end A. In this embodiment, the main radiator 21 is an IFA antenna.

[0108] In the second implementation, please refer to Figure 10 Connection point G is located at the end of the main radiator 21 furthest from the first free end A, and feed point B is located at connection point G. That is, feed point B and the first free end A are located at opposite ends of the main radiator 21. In this embodiment, the main radiator 21 is a monopole antenna.

[0109] In the third implementation, please refer to Figure 11 The end of the main radiator 21 furthest from the first free end A is a free end, disconnected from other conductive structures. Feed point B is located between the two free ends and is a connection point G. The matching circuit also includes a grounding point, which is grounded. That is, the main radiator 21 also includes a fourth free end, which is located at opposite ends of the main radiator 21, and the feed point B is located between the first free end A and the fourth free end. In this embodiment, the main radiator 21 is a T-type antenna.

[0110] The signal source 24 excites the main radiator 21 and the first parasitic radiator 22 to jointly form a first resonant mode supporting the first frequency band.

[0111] Please see Figure 12In this embodiment, the main radiator 21 and the first parasitic radiator 22 of the antenna assembly 100 form a port-to-port antenna. The current in the first resonant mode includes a first sub-current distributed from the connection point G to the first free end A and a second sub-current distributed from the second free end C to the first ground point D. The direction of the first sub-current is the same as the direction of the second sub-current. The current intensity of the first sub-current is greater than the current intensity of the second sub-current. That is, the first resonant mode is a quarter-wavelength mode of the main radiator 21, accompanied by a current in the same direction on the first parasitic radiator 22. In this embodiment, the electrical length of the main radiator 21 corresponds to 1 / 4 wavelength of the first frequency band.

[0112] Specifically, the current distribution in the first resonant mode is as follows: a stronger current flows from connection point G to the first free end A on the main radiator 21, and a weaker current flows from the second free end C to the first ground point D. The resonant mode on the main radiator 21 makes the main contribution to the efficiency of the first resonant mode, and the frequency band supported by the resonant mode on the main radiator 21 determines the effective frequency band of the first resonant mode. In other words, the frequency band supported by the first resonant mode is the first frequency band.

[0113] It should be noted that the first frequency band supported by the first resonant mode described in this application is the frequency range corresponding to a return loss of -4dB, -5dB, -6dB, or other values ​​in the S-parameters. Similarly, the second frequency band supported by the second resonant mode described in this application is the frequency range corresponding to a return loss of -4dB, -5dB, -6dB, or other values ​​in the S-parameters.

[0114] This application does not specifically limit the size of the first frequency band. Optionally, the first frequency band may include, but is not limited to, the LB band (less than or equal to 1 GHz), the MHB band (greater than 1 GHz and less than or equal to 3 GHz), or the UHB band (greater than 3 GHz). The first frequency band can be a 4G LTE (Long Term Evolution) band or a 5G NR band. Of course, the first frequency band can also be a GPS band, a Bluetooth band, or a Wi-Fi band, etc. The first frequency band can be determined according to actual needs. For example, the first frequency band can be at least one of the following: GPS L5 band, B3 band, N78 band, Wi-Fi 2.4G band, etc.

[0115] Please see Figure 13 The signal source 24 excites the main radiator 21 and the first parasitic radiator 22 to form a second resonant mode that supports the second frequency band.

[0116] The current in the second resonant mode includes a third sub-current distributed from the connection point G to the first free end A and a fourth sub-current distributed between the second free end C and the first grounding point D. The direction of the third sub-current is opposite to that of the fourth sub-current, and the current intensity of the fourth sub-current is greater than that of the third sub-current.

[0117] Specifically, the second resonant mode is a quarter-wavelength mode biased towards the first parasitic radiator 22. The second resonant mode generates a weak current on the main radiator 21, while simultaneously generating a strong reverse current on the first parasitic radiator 22. In this embodiment, the electrical length of the first parasitic radiator 22 corresponds to 1 / 4 wavelength of the second frequency band.

[0118] Specifically, the current distribution in the second resonant mode is as follows: a weaker current flows from connection point G to the first free end A on the main radiator 21, and a stronger current flows from the second free end C to the first grounding point D. The resonant mode on the first parasitic radiator 22 makes the main contribution to the efficiency of the second resonant mode, and the frequency band supported by the resonant mode on the first parasitic radiator 22 determines the effective frequency band of the second resonant mode. In other words, the frequency band supported by the second resonant mode is the second frequency band.

[0119] The first resonant mode is also called the high-mode radiating mode. The second resonant mode is also called the high-mode balanced mode.

[0120] The minimum value of the second frequency band is greater than the maximum value of the first frequency band. The difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than 1 GHz. In other words, the electrical length of the first parasitic radiator 22 is less than the electrical length of the main radiator 21. The resonant frequency of the first resonant mode is located before the resonant frequency of the second resonant mode.

[0121] The resonant frequency of the second resonant mode is close to that of the first resonant mode, for example, less than 1 GHz, but not limited to this value. For instance, the difference between the resonant frequency of the second resonant mode and that of the first resonant mode can be 200 MHz, 300 MHz, 400 MHz, 800 MHz, 900 MHz, 1000 MHz, etc. When the resonant frequency of the second resonant mode is less than that of the first resonant mode, the second resonant mode dominated by the first parasitic radiator 22 cannot improve the efficiency of the first resonant mode dominated by the main radiator 21.

[0122] When the resonant frequency of the second resonant mode is greater than that of the first resonant mode and the distance between them is large, the second resonant mode dominated by the first parasitic radiator 22 has little influence on the first resonant mode dominated by the main radiator 21. That is, the first parasitic radiator 22 has little influence on the current distribution (current traction) on the main radiator 21, and cannot guide the electric field on the main radiator 21 to improve the frequency band efficiency supported by the resonant mode on the main radiator 21. When the center frequency of the second frequency band is greater than that of the first frequency band, and the difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than 1 GHz, the second resonant mode dominated by the first parasitic radiator 22 merges with the first resonant mode dominated by the main radiator 21, producing a wave boost effect, and the generation of the second resonant mode can improve the efficiency of the first resonant mode on the main radiator 21.

[0123] Generally, after the antenna assembly 100 generates high-mode radiating mode and high-mode balanced mode, it will improve the radiation efficiency of the frequency band supported by the main radiator 21, thereby increasing the efficiency bandwidth and improving the radiation efficiency (waveboost) within the antenna band.

[0124] When the first frequency band is close to the second frequency band, the frequency band supported by the main radiating branch and the frequency band supported by the first parasitic radiator 22 form a continuous frequency band with good bandwidth.

[0125] In this application, the main radiator 21 can be a T-type antenna, an IFA antenna, or a monopole antenna, all of which can generate the aforementioned high-mode radiation mode and high-mode balanced mode.

[0126] The above describes the resonant modes formed by the main radiator 21 and the first parasitic radiator 22 under the excitation of the signal source 24. The following describes the resonant modes formed by the main radiator 21 and the second parasitic radiator 23 under the excitation of the signal source 24.

[0127] Please see Figure 14 When the foldable body 10 is in a folded state, the signal source 24 excites the main radiator 21 to form a third resonant mode supporting the third frequency band. The current of the third resonant mode includes a fifth sub-current distributed from the connection point G to the first free end A.

[0128] In this embodiment, when the foldable body 10 is in a folded state, the main radiator 21 is coupled with the second parasitic radiator 23. The second parasitic radiator 23 generates a current in the opposite direction to that on the main radiator 21 in the environment of the capacitor plate structure formed by the first body 11 and the second body 13.

[0129] The current in the third resonant mode includes the current distributed from the connection point G to the first free end A and the current distributed between the third free end E and the second ground point F. The current generated on the second parasitic radiator 23 due to the third resonant mode cancels out the current generated by the capacitor plate structure formed by the first body 11 and the second body 13; therefore, the current on the second parasitic radiator 23 is extremely weak. Thus, in this embodiment, the current in the third resonant mode appears to include a fifth sub-current distributed from the connection point G to the first free end A. The current flows, for example, from the connection point G to the first free end A.

[0130] The third resonant mode is the 1 / 4 wavelength mode corresponding to the third frequency band. Optionally, the third frequency band is the same as the first frequency band mentioned above. Of course, when the main radiator 21 is equipped with a switch circuit or adjustable capacitor for the adjustable frequency band, the third frequency band can be a different frequency band after tuning from the first frequency band.

[0131] The above does not consider the first parasitic radiator 22. When the first parasitic radiator 22 and the second parasitic radiator 23 are simultaneously coupled to the main radiator 21, the resonant mode jointly generated by the first parasitic radiator 22, the second parasitic radiator 23, and the main radiator 21 has the same current distribution as the first resonant mode described above. This is because the same-direction current generated on the second parasitic radiator 23 due to coupling with the main radiator 21 cancels out the reverse current generated by the capacitor plate structure formed by the first main body 11 and the second main body 13.

[0132] Please see Figure 15 Simultaneously with generating the third resonant mode, the signal source 24 also excites the main radiator 21 and the second parasitic radiator 23 to form a fourth resonant mode supporting the fourth frequency band. The current of the fourth resonant mode includes a sixth sub-current distributed from the connection point G to the first free end A and a seventh sub-current distributed from the third free end E to the second ground point F. The direction of the sixth sub-current is opposite to the direction of the seventh sub-current. The current intensity of the seventh sub-current is greater than that of the sixth sub-current.

[0133] Specifically, the fourth resonant mode is a quarter-wavelength mode of the second parasitic radiator 23. The fourth resonant mode generates a weak current on the main radiator 21, while simultaneously generating a strong reverse current on the second parasitic radiator 23. In this embodiment, the electrical length of the second parasitic radiator 23 corresponds to 1 / 4 wavelength of the fourth frequency band.

[0134] Specifically, the current distribution in the fourth resonant mode is as follows: a weaker current flows from connection point G to the first free end A on the main radiator 21, and a stronger current flows from the third free end E to the second grounding point F. The resonant mode on the second parasitic radiator 23 makes the main contribution to the efficiency of the fourth resonant mode, and the frequency band supported by the resonant mode on the second parasitic radiator 23 determines the effective frequency band of the fourth resonant mode. In other words, the frequency band supported by the fourth resonant mode is the fourth frequency band.

[0135] In this embodiment, the fourth frequency band and the second frequency band can cover the same frequency band, for example, both covering the B41 frequency band. Furthermore, by designing the first parasitic radiator 22 and the second parasitic radiator 23 to have the same or similar electrical lengths, the resonant frequency of the fourth resonant mode is the same as the resonant frequency formed by the second resonant mode. Therefore, during folding, when the efficiency of the second resonant mode formed by the first parasitic radiator 22 and the main radiator 21 in supporting the B41 frequency band decreases, the second parasitic radiator 23 can replace the fourth resonant mode formed by the first parasitic radiator 22 and the main radiator 21 in supporting the B41 frequency band. Alternatively, while retaining the second resonant mode, a fourth resonant mode between the second parasitic radiator 23 and the main radiator 21 can be added to support the B41 frequency band, thereby improving the radiation efficiency of the B41 frequency band.

[0136] The minimum value of the fourth frequency band is greater than the maximum value of the third frequency band, and the difference between the center frequency of the fourth frequency band and the center frequency of the third frequency band is less than 1 GHz.

[0137] In other words, the electrical length of the second parasitic radiator 23 is less than that of the main radiator 21. The resonant frequency of the third resonant mode is earlier than that of the fourth resonant mode.

[0138] The resonant frequency of the fourth resonant mode is close to that of the third resonant mode, for example, less than 1 GHz, but not limited to this value. For instance, the difference between the resonant frequency of the fourth resonant mode and that of the third resonant mode can be 200 MHz, 300 MHz, 400 MHz, 800 MHz, 900 MHz, 1000 MHz, etc. When the resonant frequency of the fourth resonant mode is less than that of the third resonant mode, the fourth resonant mode dominated by the second parasitic radiator 23 cannot improve the efficiency of the third resonant mode dominated by the main radiator 21.

[0139] When the resonant frequency of the fourth resonant mode is greater than that of the third resonant mode and the distance between them is large, the fourth resonant mode dominated by the second parasitic radiator 23 has little influence on the third resonant mode dominated by the main radiator 21. That is, the second parasitic radiator 23 has little influence on the current distribution (current traction) on the main radiator 21, and cannot guide the electric field on the main radiator 21 to improve the frequency band efficiency supported by the resonant mode on the main radiator 21. When the center frequency of the second frequency band is greater than that of the first frequency band, and the difference between the center frequency of the second frequency band and the center frequency of the first frequency band is less than 1 GHz, the fourth resonant mode dominated by the second parasitic radiator 23 merges with the third resonant mode dominated by the main radiator 21, producing a wave boost effect, and the generation of the fourth resonant mode can improve the efficiency of the third resonant mode on the main radiator 21.

[0140] When the third frequency band is close to the fourth frequency band, the frequency band supported by the main radiating branch and the frequency band supported by the second parasitic radiator 23 form a continuous frequency band with good bandwidth.

[0141] The above does not consider the first parasitic radiator 22. When the first parasitic radiator 22 and the second parasitic radiator 23 are simultaneously coupled to the main radiator 21, the current of the resonant mode jointly generated by the first parasitic radiator 22, the second parasitic radiator 23 and the main radiator 21 includes a weaker current flowing from the connection point G to the first free end A on the main radiator 21, a stronger current from the second free end C to the first grounding point D, and a stronger current from the third free end E to the second grounding point F. When the electric lengths on the first parasitic radiator 22 and the second parasitic radiator 23 are the same, the resonant modes formed by the currents on the first parasitic radiator 22 and the second parasitic radiator 23 can be the same resonant mode. That is, when the first parasitic radiator 22 and the second parasitic radiator 23 are coupled with the main radiator 21 at the same time, two resonant modes are formed. One of the resonant modes is the 1 / 4 wavelength mode dominated by the main radiator 21, and the other mode is the 1 / 4 wavelength mode dominated by the first parasitic radiator 22 and the second parasitic radiator 23. The latter 1 / 4 wavelength mode is the 1 / 4 wavelength mode synthesized by the 1 / 4 wavelength mode dominated by the first parasitic radiator 22 and the 1 / 4 wavelength mode dominated by the second parasitic radiator 23.

[0142] The above explains that in the unfolded state, the main radiator 21 and the first parasitic radiator 22 form a port-to-port antenna, generating radiating and balanced modes to improve the efficiency of the frequency bands supported by the main radiator 21. Taking the main radiator 21 supporting the B3 band and the first parasitic radiator 22 supporting the B41 band as an example, the formation of radiating and balanced modes can improve the efficiency of the B3 band. In the folded state, the main radiator 21 can form the aforementioned radiating and balanced modes with the first parasitic radiator 22, and can also couple with the second parasitic radiator 23 to form a third resonant mode similar to the radiating mode, and a fourth resonant mode similar to the balanced mode. Therefore, when the efficiency of the B3 and B41 bands decreases during folding, the coupling between the second parasitic radiator 23 and the main radiator 21 can be switched, or the first parasitic radiator 22 and the second parasitic radiator 23 can be coupled together with the main radiator 21 to improve the efficiency of the B3 and B41 bands. Furthermore, the electrical length of the second parasitic radiator 23 is designed to be different from that of the first parasitic radiator 22. For example, if the second parasitic radiator 23 supports the B1 band, then when folded, the antenna assembly 100 can support the B3 band + B1 band + B41 band, or support the B1 band + B41 band.

[0143] In this embodiment, the first parasitic radiator 22 has a grounded working state or a suspended state disconnected from the reference floor, and the second parasitic radiator 23 has a grounded working state or a suspended state disconnected from the reference floor.

[0144] The operating state of the first parasitic radiator 22 refers to its ability to couple with the main radiator 21 under the influence of the signal source 24 and jointly support the resonant mode. The first parasitic radiator 22 is grounded.

[0145] The floating state of the first parasitic radiator 22 means that the first parasitic radiator 22 cannot conduct the current of the required frequency band to the ground. It is in a floating state for the current of that frequency band. For example, the grounding point and the reference ground are in an open circuit state or the current of the required frequency band is in a high impedance state (i.e., not conducting). The operating state and floating state of the second parasitic radiator 23 can be referred to the above description.

[0146] Please see Figure 16 The antenna assembly 100 further includes a controller 40. The controller 40 is used to control the first parasitic radiator 22 to be in an operating state or a suspended state, and to control the second parasitic radiator 23 to be in an operating state or a suspended state.

[0147] The controller 40 is used to control the first parasitic radiator 22 and / or the second parasitic radiator 23 to be in working state when the foldable body 10 is in a folded state.

[0148] By setting the controller 40 to control the operating states of the first parasitic radiator 22 and the second parasitic radiator 23 respectively, the antenna assembly 100 can operate in the following modes when the foldable electronic device 1000 is folded: The first mode is that the first parasitic radiator 22 is coupled to the main radiator 21, and the second parasitic radiator 23 is not working. The second mode is that the second parasitic radiator 23 is coupled to the main radiator 21, and the first parasitic radiator 22 is not working. The third mode is that both the first parasitic radiator 22 and the second parasitic radiator 23 are coupled to the main radiator 21. Each mode corresponds to a different scenario, thus enabling the antenna assembly 100 to cope with different usage scenarios when folded, providing more operating modes, and achieving improvements in frequency band efficiency or increasing the supported frequency bands.

[0149] For details, please refer to Figure 5 The antenna assembly 100 further includes a first switching circuit SW1. The first switching circuit SW1 is electrically connected to the first grounding point D, and the other end of the first switching circuit SW1 is grounded. The controller 40 is electrically connected to the first switching circuit SW1. The first switching circuit SW1 includes a switching transistor, etc. The controller 40 is electrically connected to the first switching circuit SW1 and is used to control the conduction state of the first switching circuit SW1 for current. The conduction state includes a short-circuit state or a low-impedance state. Specifically, when the first switching circuit SW1 is in a short-circuit state between the first grounding point D and the reference ground, or in a low-impedance state for the frequency band required to be supported by the first parasitic radiator 22, the first parasitic radiator 22 can generate a resonance mode together with the main radiator 21 under the excitation of the signal source 24, that is, the first parasitic radiator 22 is in a working state. When the first switching circuit SW1 is in an open-circuit state between the first grounding point D and the reference ground, or in a high-impedance state for the frequency band required to be supported by the first parasitic radiator 22, the first parasitic radiator 22 is equivalent to a floating state, at which time the first parasitic radiator 22 is in a floating state.

[0150] Optionally, the first switching circuit SW1 may consist only of a switching transistor, enabling the first switching circuit SW1 to switch between a short-circuit state and an open state. Of course, the first switching circuit SW1 may also include components such as a switching transistor, capacitor, and inductor, enabling the first switching circuit SW1 to switch between a short-circuit state, a low-impedance state, an open state, and a high-impedance state.

[0151] Please see Figure 5The antenna assembly 100 further includes a second switching circuit SW2. The second switching circuit SW2 is electrically connected to the second grounding point F, and its other end is grounded. The controller 40 is electrically connected to the second switching circuit SW2. The second switching circuit SW2 includes a switching transistor, etc. The controller 40 is electrically connected to the second switching circuit SW2 and is used to control the conduction state of the second switching circuit SW2. The conduction state includes a short-circuit state or a low-impedance state.

[0152] Specifically, when the second switching circuit SW2 is in a short-circuit state between the second ground point F and the reference ground, or when the frequency band required to be supported by the second parasitic radiator 23 is in a low-impedance state, the second parasitic radiator 23 can generate a resonant mode together with the main radiator 21 under the excitation of the signal source 24, that is, the second parasitic radiator 23 is in an operating state. When the second switching circuit SW2 is in an open-circuit state between the second ground point F and the reference ground, or when the frequency band required to be supported by the second parasitic radiator 23 is in a high-impedance state, the second parasitic radiator 23 is equivalent to being in a floating state.

[0153] Optionally, the second switching circuit SW2 may consist only of a switching transistor, enabling it to switch between a short-circuit state and an open state. Alternatively, the second switching circuit SW2 may also include components such as a switching transistor, capacitor, and inductor, enabling it to switch between short-circuit, low-impedance, open, and high-impedance states.

[0154] The controller 40 is used to control the antenna assembly 100 to switch between a first operating mode, a second operating mode, and a third operating mode when the foldable body 10 is in a folded state. In the first operating mode, the first switching circuit SW1 is in a conducting state and the second switching circuit SW2 is in a de-conducting state. In the second operating mode, the first switching circuit SW1 is in a de-conducting state and the second switching circuit SW2 is in a conducting state. In the third operating mode, the first switching circuit SW1 is in a conducting state and the second switching circuit SW2 is in a conducting state.

[0155] The controller 40 is also configured to control the antenna assembly 100 to be in the first operating mode when the foldable electronic device 1000 is in the unfolded state, so that the first parasitic radiator 22 is coupled to the main radiator 21 to support the required frequency band and have good efficiency.

[0156] In the first operating mode, the signal source 24 excites the main radiator 21 and the first parasitic radiator 22 to form a first resonant mode and a second resonant mode. The intensity of the resonant current of the first resonant mode on the main radiator 21 is greater than the intensity of the resonant current of the first resonant mode on the first parasitic radiator 22. The direction of the resonant current of the first resonant mode on the main radiator 21 is the same as the direction of the resonant current of the first resonant mode on the first parasitic radiator 22.

[0157] The intensity of the resonant current of the second resonant mode on the main radiator 21 is less than the intensity of the resonant current of the first resonant mode on the first parasitic radiator 22. The direction of the resonant current of the first resonant mode on the main radiator 21 is opposite to the direction of the resonant current of the first resonant mode on the first parasitic radiator 22.

[0158] The first resonant mode is a high-mode radiation mode, and the second resonant mode is a high-mode balanced mode. When folded, the first parasitic radiator 22 is coupled with the main radiator 21 to support the required frequency band and has good efficiency.

[0159] In the second operating mode, the signal source 24 excites the main radiator 21 and the second parasitic radiator 23 to form a third resonant mode and a fourth resonant mode. The resonant current of the third resonant mode is distributed on the main radiator 21.

[0160] The intensity of the resonant current of the fourth resonant mode on the main radiator 21 is less than the intensity of the resonant current of the fourth resonant mode on the second parasitic radiator 23. The direction of the resonant current of the fourth resonant mode on the main radiator 21 is opposite to the direction of the resonant current of the fourth resonant mode on the second parasitic radiator 23.

[0161] When folded, the second parasitic radiator 23 couples with the main radiator 21 to support the required frequency band with good efficiency.

[0162] In the third operating mode, the signal source 24 excites the main radiator 21, the first parasitic radiator 22, and the second parasitic radiator 23 to form a fifth resonant mode and a sixth resonant mode. The resonant current of the fifth resonant mode is distributed on the main radiator 21. The resonant current distribution of the fifth resonant mode is consistent with the current distribution of the third resonant mode; for details, please refer to the description of the current distribution of the third resonant mode.

[0163] The intensity of the resonant current of the sixth resonant mode on the main radiator 21 is less than the intensity of the resonant current of the sixth resonant mode on the first parasitic radiator 22. The intensity of the resonant current of the sixth resonant mode on the main radiator 21 is less than the intensity of the resonant current of the sixth resonant mode on the second parasitic radiator 23. The direction of the resonant current of the sixth resonant mode on the main radiator 21 is opposite to the direction of the resonant current of the sixth resonant mode on the first parasitic radiator 22. The direction of the resonant current of the sixth resonant mode on the main radiator 21 is opposite to the direction of the resonant current of the sixth resonant mode on the second parasitic radiator 23.

[0164] When folded, both the first parasitic radiator 22 and the second parasitic radiator 23 are coupled to the main radiator 21 to support the required frequency band and have good efficiency.

[0165] In a first optional scenario, the controller 40 is used to control the first switching circuit SW1 to be in an open circuit state or a high impedance state, the first parasitic radiator 22 to be in a suspended state, and the second parasitic radiator 23 to be in an active state when the foldable body 10 is in a folded state and the first parasitic radiator 22 is blocked.

[0166] For details, please refer to Figure 16 The foldable electronic device 1000 also includes a detection module 50. The detection module 50 includes at least one detector. Optionally, the detection module 50 includes a first detector 51 for detecting the folded state and a second detector 52 for detecting whether the first parasitic radiator 22 is blocked.

[0167] The first detector 51 includes, but is not limited to, a position monitor for detecting the rotational position of the shaft, an angle detector for detecting the rotational angle of the shaft, a gyroscope for detecting relative orientation, or a light detector, Hall effect detector, magnetic detector, etc., for detecting proximity.

[0168] The second detector 52 includes, but is not limited to, a proximity detector for detecting the first parasitic radiator 22 of a human hand, head, or other object approaching the foldable electronic device 1000.

[0169] Because the first parasitic radiator 22 is blocked by a hand, head, or other object, the frequency band supported by the first parasitic radiator 22 will experience frequency deviation, resulting in reduced efficiency or inability to support the required frequency band. To address this issue, when the detection module 50 detects that the foldable electronic device 1000 is in a folded state and the first parasitic radiator 22 is blocked by a hand, head, or other object, the detection module 50 sends a monitoring signal to the controller 40. The controller 40 controls the electrical conduction state of the first switching circuit SW1 and the second switching circuit SW2 based on this monitoring signal, thereby making the first parasitic radiator 22 suspended and the second parasitic radiator 23 operational. In this way, the second parasitic radiator 23 can continue to support the required frequency band along with the main radiator 21, ensuring that the required frequency band (e.g., B3 and B41) maintains good coverage and support even when the first parasitic radiator 22 is blocked during unfolding and folding.

[0170] Furthermore, when the first parasitic radiator 22 is blocked, controlling the first parasitic radiator 22 to be in a suspended state relative to the first parasitic radiator 22 being in a working state has little impact on the formation of a resonant mode between the second parasitic radiator 23 and the main radiator 21.

[0171] In a second optional scenario, the controller 40 is configured to control the second switching circuit SW2 to be in an open circuit state or a high impedance state when the foldable body 10 is in a folded state and the second parasitic radiator 23 is blocked, and the second parasitic radiator 23 is in a suspended state; and the first switching circuit SW1 is in a conducting state, and the first parasitic radiator 22 is in a working state.

[0172] Because the second parasitic radiator 23 is blocked by a hand, head, or other object, the frequency band supported by the second parasitic radiator 23 will experience frequency deviation, resulting in reduced efficiency or inability to support the required frequency band. To address this issue, when the detection module 50 detects that the foldable electronic device 1000 is in a folded state and the second parasitic radiator 23 is blocked by a hand, head, or other object, the detection module 50 sends a monitoring signal to the controller 40. The controller 40 controls the electrical conduction state of the second switching circuit SW2 and the first switching circuit SW1 based on this monitoring signal, thereby making the second parasitic radiator 23 suspended and the first parasitic radiator 22 operational. In this way, the first parasitic radiator 22 and the main radiator 21 can continue to support the required frequency band, ensuring that the required frequency band (e.g., B3 and B41) maintains good coverage and support even when the second parasitic radiator 23 is blocked during unfolding and folding.

[0173] Furthermore, when the second parasitic radiator 23 is blocked, controlling the second parasitic radiator 23 to be in a suspended state relative to the second parasitic radiator 23 being in an operating state has little impact on the formation of a resonant mode between the first parasitic radiator 22 and the main radiator 21.

[0174] In a third optional scenario, the controller 40 is used to control both the first switching circuit SW1 and the second switching circuit SW2 to be in a conducting state when the foldable body 10 is in a folded state and both the first parasitic radiator 22 and the second parasitic radiator 23 are blocked.

[0175] Because both the first parasitic radiator 22 and the second parasitic radiator 23 are blocked by hands, heads, etc., the frequency bands supported by the first parasitic radiator 22 and the second parasitic radiator 23 will experience frequency deviation, resulting in reduced efficiency or inability to support the required frequency bands. To address this issue, when the detection module 50 detects that the foldable electronic device 1000 is in a folded state and both the first parasitic radiator 22 and the second parasitic radiator 23 are blocked by hands, heads, etc., the detection module 50 sends a monitoring signal to the controller 40. The controller 40 controls the electrical conduction state of the second switching circuit SW2 and the first switching circuit SW1 according to the monitoring signal, thereby enabling the second parasitic radiator 23 and the first parasitic radiator 22 to operate. By improving the mode efficiency of the first parasitic radiator 22 and the second parasitic radiator 23, good coverage and support for the required frequency bands (e.g., B3 and B41) can be maintained.

[0176] The controller 40 is also used to control the first switching circuit SW1 to be in a conducting state and the second switching circuit SW2 to be in a closed state or a high impedance state when the foldable body 10 is in an unfolded state.

[0177] Please see Figure 17 The foldable electronic device 1000 further includes a detection circuit 60. The detection circuit 60 is used to detect whether a subject under test is close to the foldable electronic device 1000. The detection circuit 60 is electrically connected to at least one of the main radiator 21, the first parasitic radiator 22, and the second parasitic radiator 23. The detection circuit 60 includes, but is not limited to, a circuit for detecting capacitance changes. The detection circuit 60 also includes a large inductor for AC isolation to prevent AC signals in the detection circuit 60 from affecting the radio frequency signals on the radiators.

[0178] The subject to be measured includes, but is not limited to, parts of the human body such as the head and hands that carry electrical charges. The specific detection principle is as follows: When no subject is near the radiator, a stable initial capacitance, such as Cnv, is formed between the radiator and the reference ground. When the subject approaches the radiator, the electric field generated by the charged subject changes the initial electric field between the radiator and the reference ground, thus changing the capacitance between them to Cnv + Cuser. The detection circuit 60 detects the presence of a subject near the proximity sensor by detecting this change in capacitance between the radiator and the reference ground.

[0179] In this embodiment, by electrically connecting the detection circuit 60 to at least one of the main radiator 21, the first parasitic radiator 22, and the second parasitic radiator 23, at least one of the main radiator 21, the first parasitic radiator 22, and the second parasitic radiator 23 is used as an electrode to detect whether the subject under test is close to the foldable electronic device 1000, thereby realizing the reuse of radiators, the integration of the antenna assembly 100 and the proximity sensor, and reducing the space occupied.

[0180] The detection circuit 60 and the electrically connected detection electrodes form a SAR sensor. SAR stands for Specific Absorption Rate, which is the ratio of electromagnetic radiation absorbed by the human body.

[0181] The foldable electronic device 1000 also includes a SAR detector (not shown). The controller 40 is electrically connected to the SAR detector. The controller 40 is also configured to control the antenna assembly 100 to be in the first operating mode when the SAR detector detects that the second parasitic radiator 23 is blocked, to control the antenna assembly 100 to be in the second operating mode when the SAR detector detects that the first parasitic radiator 22 is blocked, and to control the antenna assembly 100 to be in the third operating mode when the SAR detector detects that both the first parasitic radiator 22 and the second parasitic radiator 23 are blocked.

[0182] The foldable electronic device 1000 provided in this application embodiment can also intelligently switch between the first switching circuit SW1 and the second switching circuit SW2 via a SAR sensor, ensuring the performance of the B41 band for human hands. When the SAR sensor detects a finger on the first parasitic radiator 22, the controller 40 controls the first switching circuit SW1 to be in the off state and the second switching circuit SW2 to be in the on state, using the second parasitic radiator 23 to avoid the finger. When the SAR sensor detects a hand on the second parasitic radiator 23, the controller 40 controls the first switching circuit SW1 to be in the on state and the second switching circuit SW2 to be in the off state, using the first parasitic radiator 22 to avoid the finger. This ensures that one parasitic radiator in the B41 band is working normally, without a large frequency offset (unpredictable frequency offset will occur when a finger touches it), improving the user experience. If, in an extreme scenario, a finger touches both parasitic radiators, the controller 40 controls both the first switching circuit SW1 and the second switching circuit SW2 to be in the on state simultaneously to improve antenna efficiency and reduce frequency offset.

[0183] Optionally, the matching circuit M1 includes a DC blocking capacitor electrically connected to the main radiator 21. The DC blocking capacitor is used to isolate DC signals or small AC signals. The DC blocking capacitor acts as an open circuit for DC signals or small AC signals. The DC blocking capacitor is a large capacitor, for example, around 100pF, but is not limited to this value.

[0184] When the main radiator 21 is a monopole antenna, after setting the DC blocking capacitor in the matching circuit M1, the main radiator 21 is a suspended stub relative to the DC signal or small AC signal without switching, and can be used as a detection electrode for the proximity of the subject under test to detect whether the subject under test is close to the antenna assembly 100.

[0185] When the main radiator 21 is a T-type antenna or an IFA antenna, the DC blocking capacitor set in the matching circuit M1 is the first DC blocking capacitor. In addition, the grounding point of the main radiator 21 is grounded through another DC blocking capacitor (called the second DC blocking capacitor). The main radiator 21 is a floating stub relative to the DC signal or small AC signal without switching, and can be used as a detection electrode for the proximity of the subject under test to detect whether the subject under test is close to the antenna assembly 100.

[0186] After designing the main radiator 21 as a suspended branch, the detection circuit 60 is electrically connected to the main radiator 21, so that the main radiator 21 serves as an electrode for detecting whether the subject under test is close to the foldable electronic device 1000, thereby realizing the reuse of the radiator, the integration of the antenna assembly 100 and the proximity sensor, and reducing the space occupied.

[0187] Optional, please refer to Figure 18When the first switching circuit SW1 is in the open state, the first parasitic radiator 22 is in the floating state, and the detection circuit 60 is electrically connected to the first parasitic radiator 22, so that the first parasitic radiator 22 is used as a detection electrode for the proximity of the subject under test, and the detection circuit 60 detects whether the subject under test is close to the antenna assembly 100.

[0188] Alternatively, a DC blocking capacitor (referred to as a third DC blocking capacitor) may be provided inside the first switching circuit SW1 or between the first switching circuit SW1 and the first parasitic radiator 22. The first parasitic radiator 22 is a suspended stub relative to the DC signal or small AC signal when the first switching circuit SW1 does not need to be in the off state. It can be used as a detection electrode for the proximity of the subject under test to detect whether the subject under test is close to the antenna assembly 100.

[0189] Optional, please refer to Figure 19 When the second switch circuit SW2 is in the off state, the second parasitic radiator 23 is in the floating state, and the detection circuit 60 is electrically connected to the second parasitic radiator 23, so that the second parasitic radiator 23 is used as a detection electrode for the proximity of the subject under test, and the detection circuit 60 detects whether the subject under test is close to the antenna assembly 100.

[0190] Alternatively, a DC blocking capacitor (referred to as a fourth DC blocking capacitor) may be provided inside the second switching circuit SW2 or between the second switching circuit SW2 and the second parasitic radiator 23. The second parasitic radiator 23 is a suspended stub relative to the DC signal or small AC signal when the first switching circuit SW1 does not need to be in the off state. It can be used as a detection electrode for the proximity of the subject under test to detect whether the subject under test is close to the antenna assembly 100.

[0191] Optional, please refer to Figure 20 The antenna assembly 100 further includes a third switching circuit SW3. The fixed terminal of the third switching circuit SW3 is electrically connected to the detection circuit 60. The selection terminal of the third switching circuit SW3 is electrically connected to the main radiator 21, the first parasitic radiator 22, and the second parasitic radiator 23. The controller 40 is electrically connected to the third switching circuit SW3. The controller 40 is used to control the selection terminal of the third switching circuit SW3 to switch to the first parasitic radiator 22 when the first parasitic radiator 22 is in a floating state. It is also used to control the selection terminal of the third switching circuit SW3 to switch to the second parasitic radiator 23 when the second parasitic radiator 23 is in a floating state.

[0192] Specifically, when the first switching circuit SW1 is in the open state, and the first parasitic radiator 22 is in a floating state, the controller 40 controls the selection terminal of the third switching circuit SW3 to switch to the first parasitic radiator 22. Utilizing the floating state of the first parasitic radiator 22, it serves as a detection electrode to detect whether the subject under test is close to the antenna assembly 100. After the first parasitic radiator 22 and the detection circuit 60 detect that the subject under test is moving away from the first parasitic radiator 22, the controller 40 can control the first switching circuit SW1 to switch to a short-circuit state or a low-impedance state. In this way, the first parasitic radiator 22 can form a resonant mode with the main radiator 21, improving radiation efficiency and enabling intelligent switching to support the required frequency band.

[0193] Specifically, the controller 40 is further configured to, when the second switching circuit SW2 is in the open state and the second parasitic radiator 23 is in a floating state, control the selection terminal of the third switching circuit SW3 to switch to the second parasitic radiator 23. Utilizing the floating state of the second parasitic radiator 23, it serves as a detection electrode to detect whether the subject under test is close to the antenna assembly 100. After the second parasitic radiator 23 and the detection circuit 60 detect that the subject under test is moving away from the second parasitic radiator 23, the controller 40 can control the second switching circuit SW2 to switch to a short-circuit state or a low-impedance state. In this way, the second parasitic radiator 23 can form a resonant mode with the main radiator 21, improving radiation efficiency and enabling intelligent switching to support the required frequency band.

[0194] Please see Figure 5 The antenna assembly 100 further includes a first tuning circuit M2. The first tuning circuit M2 includes a plurality of grounded first tuning branches. The end of the first switching circuit SW1 furthest from the first grounding point D is selectively electrically connected to one of the plurality of first tuning branches. The first tuning branches include capacitors and / or inductors, etc. Of course, in other embodiments, the first tuning branches also include variable capacitors. Each first tuning branch has a different impedance value. By switching the first switching circuit SW1, different impedance values ​​of the first tuning branches are connected to the first parasitic radiator 22, changing the electrical length from the first parasitic radiator 22 to ground, and the first tuning circuit M2 is used to adjust the frequency band of the first resonant mode.

[0195] Please see Figure 5The antenna assembly 100 further includes a second tuning circuit M3. The second tuning circuit M3 includes multiple grounded second tuning branches. One end of the second switching circuit SW2, away from the second grounding point F, is selectively electrically connected to one of the multiple second tuning branches. The second tuning branches include capacitors and / or inductors, etc. Of course, in other embodiments, the second tuning branches also include variable capacitors. Each second tuning branch has a different impedance value. By switching the second switching circuit SW2, different impedance values ​​of the second tuning branches are connected to the second parasitic radiator 23, changing the electrical length from the second parasitic radiator 23 to ground. The second tuning circuit M3 is used to adjust the frequency band of the second resonant mode.

[0196] The following example assumes that the main radiator 21 operates in the B3 frequency band, while both the first parasitic radiator 22 and the second parasitic radiator 23 can operate in the B41 frequency band. When folded, the first parasitic radiator 22 and the main radiator 21 are misaligned and coupled. The intelligent switching of the first switching circuit SW1 and the second switching circuit SW2 ensures the performance of the B41 frequency band. When the first switching circuit SW1 is in the ON state and the second switching circuit SW2 is in the OFF state, the electromagnetic wave generated by the main radiator 21 is coupled to the first parasitic radiator 22, and the first parasitic radiator 22 operates in the B41 frequency band. When the first switching circuit SW1 is in the OFF state and the second switching circuit SW2 is in the ON state, the electromagnetic wave generated by the main radiator 21 is coupled to the second parasitic radiator 23, and the second parasitic radiator 23 operates in the B41 frequency band. When both the first switching circuit SW1 and the second switching circuit SW2 are in the ON state, the electromagnetic wave generated by the main radiator 21 can be coupled to the first parasitic radiator 22 and the second parasitic radiator 23, and the first parasitic radiator 22 and the second parasitic radiator 23 operate in the B41 frequency band simultaneously, which can improve the performance of the B41 frequency band.

[0197] Please see Figure 21 , Figure 21These are the S-parameter curves of the antenna assembly 100 of the foldable electronic device 1000 provided in this application embodiment, in the unfolded state, in the folded state with the first switching circuit SW1 in the on state and the second switching circuit SW2 in the off state, in the folded state with the first switching circuit SW1 in the off state and the second switching circuit SW2 in the off state, and in the folded state with both the first switching circuit SW1 and the second switching circuit SW2 in the on state. Curve a refers to the S-parameter curve of the antenna assembly 100 of the foldable electronic device 1000 in the unfolded state. Curve b refers to the S-parameter curve of the antenna assembly 100 in the folded state with the first switching circuit SW1 in the on state and the second switching circuit SW2 in the off state. Curve c refers to the S-parameter curve of the antenna assembly 100 in the folded state with the first switching circuit SW1 in the off state and the second switching circuit SW2 in the off state. Curve d refers to the S-parameter curve of the antenna assembly 100 in the folded state with both the first switching circuit SW1 and the second switching circuit SW2 in the on state.

[0198] As can be seen from the curve, the antenna assembly 100 provided in this application supports both the B3 and B41 frequency bands when it is in the unfolded state, when the first switching circuit SW1 is in the on state and the second switching circuit SW2 is in the off state, when it is in the folded state, when the first switching circuit SW1 is in the off state and the second switching circuit SW2 is in the closed state, and when both the first switching circuit SW1 and the second switching circuit SW2 are in the on state.

[0199] Please see Figure 12 and Figure 13 Please see Figure 12 and Figure 13 This is a current distribution diagram of the foldable electronic device 1000 provided in this application when it is unfolded, in its operating mode. Please refer to... Figure 12 In the deployed state, the operating mode current in the B3 band is primarily a quarter-wavelength current of the main radiator 21, accompanied by a weaker quarter-wavelength unidirectional current of the first parasitic radiator 22; please refer to [link / reference]. Figure 13 The operating mode current of the B41 band is mainly the quarter-wavelength current of the first parasitic radiator 22, accompanied by a weaker quarter-wavelength reverse current of the main radiator 21.

[0200] Please see Figure 22 and Figure 23 , Figure 22 and Figure 23 This is a current distribution diagram showing the operating mode of the foldable electronic device 1000 provided in this application, where the first switching circuit SW1 is in the on state and the second switching circuit SW2 is in the off state when folded. Please refer to... Figure 22The operating mode current in the B3 band is primarily a quarter-wavelength current from the main radiator 21, accompanied by a weaker quarter-wavelength current in the same direction from the first parasitic radiator 22. Please refer to [link / reference]. Figure 23 The operating mode current in the B41 band is mainly a quarter-wavelength current from the first parasitic radiator 22, accompanied by a weaker quarter-wavelength reverse current from the main radiator 21. Since the second switching circuit SW2 is in the off state, the second parasitic radiator 23 is floating. The resonant frequency of the second parasitic radiator 23 is very high, and the matching circuit M1 can filter out higher frequencies. Therefore, when the B41 band is operating, the second parasitic radiator 23 does not generate reverse current, thus reducing the canceling effect of the reverse current and improving efficiency.

[0201] Please see Figure 14 and Figure 15 , Figure 14 and Figure 15 This is a current distribution diagram showing the operating mode of the foldable electronic device 1000 provided in this application, where the first switching circuit SW1 is in the off state and the second switching circuit SW2 is in the on state when folded. Please refer to... Figure 14 The operating mode current in the B3 band is primarily a quarter-wavelength current of the main radiator 21. (See also...) Figure 15 The operating mode of the B41 band is mainly a quarter-wavelength current from the second parasitic radiator 23, accompanied by a weaker quarter-wavelength reverse current from the main radiator 21. Since the first switching circuit SW1 is in the off state, the first parasitic radiator 22 is floating. The resonant frequency of the first parasitic radiator 22 is very high, and the matching circuit M1 can filter out higher frequencies. Therefore, when the B41 band is operating, no current is generated in the first parasitic radiator 22. Meanwhile, the second parasitic radiator 23 is relatively misaligned with the main radiator 21, and the large current return to ground is relatively offset from the main radiator 21, thus the decrease in radiation efficiency is relatively weakened.

[0202] Please see Figure 24 and Figure 25 , Figure 24 and Figure 25 This is a current distribution diagram showing the operating mode of the foldable electronic device 1000 provided in this application, where the first switching circuit SW1 and the second switching circuit SW2 are simultaneously in the on state when folded. Please refer to... Figure 24 The operating mode current in the B3 band is primarily a quarter-wavelength current of the main radiator 21. (See also...) Figure 25 The operating mode current in the B41 band is mainly the quarter-wavelength current of the first parasitic radiator 22 and the second parasitic radiator 23, accompanied by a weaker quarter-wavelength reverse current of the main radiator 21. At this time, the first parasitic radiator 22 and the second parasitic radiator 23 work simultaneously, resulting in a double improvement in overall efficiency.

[0203] Please see Figure 26 , Figure 26 This is a comparison diagram of the efficiency of the antenna assembly 100 provided in this application embodiment and the slot-opposite antenna assembly. The slot-opposite antenna assembly refers to the second parasitic radiator being directly opposite the first parasitic radiator and having the same length, and the third parasitic radiator being directly opposite the main radiator and having the same length. The slot between the main radiator and the first parasitic radiator is directly opposite the slot between the second parasitic radiator and the third parasitic radiator.

[0204] As can be seen from the figure, the antenna assembly 100 provided in this embodiment of the application can ensure the working efficiency of the B41 band when folded and unfolded by intelligent switching. The efficiency of the B41 band is greatly improved when the first parasitic radiator 22 and the second parasitic radiator 23 work simultaneously. The antenna assembly 100 provided in this embodiment of the application improves the efficiency of either parasitic radiator when working by setting the second parasitic radiator 23 and the main radiator 21 to be staggered, compared with the design with gaps. In addition, the antenna assembly 100 provided in this embodiment of the application can intelligently avoid fingers by setting the second parasitic radiator 23 and the main radiator 21 to ensure that the B41 band cannot be gripped tightly.

[0205] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. A foldable electronic device, characterized in that, The device includes a foldable body and an antenna assembly. The foldable body includes a first body and a second body. The first body and the second body are movably connected to each other to present a folded state or an unfolded state. The first body includes a first extension edge, and the second body includes a second extension edge. When the foldable body is in the folded state, the first extension edge and the second extension edge are opposite to each other in the thickness direction of the foldable body. The antenna assembly includes: A main radiator is disposed on the first extended side, and the main radiator includes a first free end and a feed point that are spaced apart. A signal source, which is electrically connected to the feed point, is used to feed an excitation current into the main radiator. A first parasitic radiator is at least partially disposed on the first extension edge. The first parasitic radiator includes a second free end and a first grounding point. A first coupling gap is formed between the second free end and the first free end. The first parasitic radiator is coupled to the main radiator through the first coupling gap. The second parasitic radiator is disposed on the second extended side. The second parasitic radiator includes a third free end and a second grounding point. When the foldable body is in a folded state, the direction of the feed point pointing to the first free end is opposite to the direction of the second grounding point pointing to the third free end. In the thickness direction of the foldable body, the second parasitic radiator is at least partially opposite and coupled to the main radiator.

2. The foldable electronic device as claimed in claim 1, characterized in that, The first parasitic radiator has a grounded working state or a suspended state disconnected from the reference floor, and the second parasitic radiator has a grounded working state or a suspended state disconnected from the reference floor.

3. The foldable electronic device as described in claim 2, characterized in that, The antenna assembly further includes a controller, a first switching circuit, and a second switching circuit. The first switching circuit is electrically connected to the first grounding point, and the other end of the first switching circuit is grounded. The second switching circuit is electrically connected to the second grounding point, and the other end of the second switching circuit is grounded. The controller is electrically connected to the first switching circuit and the second switching circuit. The controller is used to control the antenna assembly to switch between a first operating mode, a second operating mode, and a third operating mode when the foldable body is in a folded state. The first operating mode is when the first switching circuit is in a conducting state and the second switching circuit is in a de-conducting state; the second operating mode is when the first switching circuit is in a de-conducting state and the second switching circuit is in a conducting state; and the third operating mode is when the first switching circuit is in a conducting state and the second switching circuit is in a conducting state.

4. The foldable electronic device as claimed in claim 3, characterized in that, In the first operating mode, the signal source excites the main radiator and the first parasitic radiator to form a first resonant mode and a second resonant mode. The intensity of the resonant current of the first resonant mode on the main radiator is greater than the intensity of the resonant current of the first resonant mode on the first parasitic radiator. The direction of the resonant current of the first resonant mode on the main radiator is the same as the direction of the resonant current of the first resonant mode on the first parasitic radiator. The intensity of the resonant current of the second resonant mode on the main radiator is less than the intensity of the resonant current of the first resonant mode on the first parasitic radiator, and the direction of the resonant current of the first resonant mode on the main radiator is opposite to the direction of the resonant current of the first resonant mode on the first parasitic radiator.

5. The foldable electronic device as claimed in claim 3, characterized in that, In the second operating mode, the signal source excites the main radiator and the second parasitic radiator to form a third resonant mode and a fourth resonant mode, and the resonant current of the third resonant mode is distributed on the main radiator; The intensity of the resonant current of the fourth resonant mode on the main radiator is less than the intensity of the resonant current of the fourth resonant mode on the second parasitic radiator, and the direction of the resonant current of the fourth resonant mode on the main radiator is opposite to the direction of the resonant current of the fourth resonant mode on the second parasitic radiator.

6. The foldable electronic device as claimed in claim 3, characterized in that, In the third operating mode, the signal source excites the main radiator, the first parasitic radiator and the second parasitic radiator to form a fifth resonant mode and a sixth resonant mode, and the resonant current of the fifth resonant mode is distributed on the main radiator; The intensity of the resonant current of the sixth resonant mode on the main radiator is less than the intensity of the resonant current of the sixth resonant mode on the first parasitic radiator, and the intensity of the resonant current of the sixth resonant mode on the main radiator is less than the intensity of the resonant current of the sixth resonant mode on the second parasitic radiator. The direction of the resonant current of the sixth resonant mode on the main radiator is opposite to the direction of the resonant current of the sixth resonant mode on the first parasitic radiator; the direction of the resonant current of the sixth resonant mode on the main radiator is opposite to the direction of the resonant current of the sixth resonant mode on the second parasitic radiator.

7. The foldable electronic device as claimed in claim 3, characterized in that, The foldable electronic device further includes a SAR detector, and the controller is electrically connected to the SAR detector. The controller is also configured to control the antenna assembly to be in the first operating mode when the SAR detector detects that the second parasitic radiator is blocked, to control the antenna assembly to be in the second operating mode when the SAR detector detects that the first parasitic radiator is blocked, and to control the antenna assembly to be in the third operating mode when the SAR detector detects that both the first parasitic radiator and the second parasitic radiator are blocked.

8. The foldable electronic device as claimed in claim 3, characterized in that, The controller is also configured to control the antenna assembly to be in the first operating mode when the foldable electronic device is in the unfolded state.

9. The foldable electronic device according to any one of claims 1-8, characterized in that, In the folded state, the orthographic projection of the second grounding point in the thickness direction of the foldable body is located on the first parasitic radiator, and the orthographic projection of the third free end in the thickness direction of the foldable body is located on the main radiator.

10. The foldable electronic device as claimed in claim 9, characterized in that, The orthographic projection of the third free end of the second parasitic radiator onto the main radiator is spaced apart from the end of the main radiator away from the first free end; the orthographic projection of the second grounding point of the second parasitic radiator onto the first parasitic radiator is spaced apart from the first grounding point.

11. The foldable electronic device according to any one of claims 1-8, characterized in that, The feed point and the first free end are located at opposite ends of the main radiator; or... The main radiator further includes a fourth free end, which is located at opposite ends of the main radiator, as are the first free end. The feed point is located between the first free end and the fourth free end; or... The main radiator also includes a third grounding point, which is located at opposite ends of the main radiator, and the feed point is located between the third grounding point and the first free end.

12. The foldable electronic device according to any one of claims 3-8, characterized in that, The antenna assembly further includes a first tuning circuit, which includes a plurality of grounded first tuning branches. The end of the first switching circuit away from the first grounding point can be selectively grounded to one of the plurality of first tuning branches. And / or, the antenna assembly further includes a second tuning circuit, the second tuning circuit including a plurality of grounded second tuning branches, and one end of the second switching circuit away from the second ground point is selectively grounded to one of the plurality of second tuning branches.

13. The foldable electronic device according to any one of claims 1-8, characterized in that, Both the first body and the second body are conductive structures. When the first body and the second body are folded, the first body and the second body are positioned opposite each other, and a capacitor structure is formed between the first body and the second body.

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