Foldable electronic device

Abstract

The invention discloses foldable electronic equipment, a main radiator is arranged on a first extension edge of a foldable main body, and the main radiator comprises a first free end and a feeding point which are arranged at an interval; the signal source is electrically connected with the feeding point and is used for feeding excitation current into the main radiator; at least part of the first parasitic radiator is arranged on the first extension 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; the second parasitic radiator is arranged on the second extension edge, the second parasitic radiator comprises a third free end and a second grounding point, and when the foldable body is in a folded state, the direction of the feeding point pointing to the first free end is opposite to the direction of the second grounding point pointing to the third free end. The second parasitic radiator is opposite and coupled to at least a portion of the main radiator. According to the invention, the antenna performance of the foldable electronic equipment during folding can be improved.

Description

Technical Field

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

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

[0003] The present application provides a foldable electronic device capable of improving antenna performance when folding and unfolding.

[0004] A foldable electronic device provided in an embodiment of the present application includes a foldable body and an antenna assembly, wherein the foldable body includes a first body and a second body; the first body is movably connected with the second body to present a folded state or an unfolded state, the first body includes a first extending edge, the second body includes a second extending edge, and when the foldable body is in the folded state, the first extending edge and the second extending edge are opposite to each other in a thickness direction of the foldable body;

[0005] The antenna assembly comprises:

[0006] A main radiator is arranged on the first extension edge, and the main radiator includes a first free end and a feeding point which are arranged at intervals;

[0007] A signal source, the signal source being electrically connected to the feeding point and used for feeding an excitation current to the main radiator;

[0008] a first parasitic radiator, at least partially disposed on the first extension edge, the first parasitic radiator comprising a second free end and a first grounding point, a first coupling gap formed between the second free end and the first free end, and the first parasitic radiator being coupled to the main radiator through the first coupling gap;

[0009] A second parasitic radiator is arranged on the second extension edge, 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 in which the feeding point points to the first free end is opposite to the direction in which the second grounding point points to the third free end, and in the thickness direction of the foldable body, the second parasitic radiator is opposite to and coupled with at least a portion of the main radiator.

[0010] The foldable electronic device provided by the embodiment of the present application is characterized in that a main radiator is arranged on the first extension side of the first body, the main radiator includes a first free end and a feeding point arranged at intervals; a signal source is electrically connected to the feeding point, and the signal source is used to feed an excitation current to the main radiator; at least a part of the first parasitic radiator is arranged on the first extension side of the first body, 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, a second parasitic radiator is arranged on the second extension side of the second body, the second parasitic radiator includes a third free end and a second grounding point, and the foldable main When the body is in a folded state, the direction in which the feeding point points to the first free end is opposite to the direction in which the second grounding point points to the third free end, and in the thickness direction of the foldable body, the second parasitic radiator is opposite to and coupled with at least a portion of the main radiator; by arranging the first parasitic radiator and the second parasitic radiator, wherein the first parasitic radiator is coupled with the main radiator in the unfolded state, and a resonant mode is generated together 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 can be coupled with the main radiator when folded, and a resonant mode is generated together to cover the required frequency band and improve efficiency, thereby improving the antenna performance of the foldable electronic device when folded and unfolded. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

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

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

[0014] Figure 3 It is a structural schematic diagram of a first body and a second body in a foldable electronic device provided by an embodiment of the present application that slide and fold;

[0015] Figure 4 It is a schematic diagram of the structure of the first body and the second body of the foldable electronic device provided by the embodiment of the present application being rotated and folded;

[0016] Figure 5 is a structural schematic diagram of a first antenna assembly in an unfolded state provided in an embodiment of the present application;

[0017] Figure 6 yes Figure 5 A three-dimensional structural diagram of the provided antenna assembly when folded;

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

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

[0020] Fig. 9 is a schematic diagram of a third position of an antenna assembly provided in an embodiment of the present application;

[0021] Fig.10 is a structural schematic diagram of a second antenna assembly provided in an embodiment of the present application;

[0022] Fig.11 is a structural schematic diagram of a third antenna assembly provided in an embodiment of the present application;

[0023] Fig.12 is a current distribution diagram of a first resonant mode of a first antenna assembly provided in an embodiment of the present application when deployed;

[0024] Fig.13 is a current distribution diagram of the second resonance mode of the first antenna assembly provided in an embodiment of the present application when it is unfolded;

[0025] Fig.14 is a current distribution diagram of the third resonance mode of the first antenna assembly provided in an embodiment of the present application when folded;

[0026] Fig.15 is a current distribution diagram of the fourth resonance mode of the first antenna assembly provided in an embodiment of the present application when folded;

[0027] Fig.16 This is a first control circuit block diagram provided in an embodiment of the present application;

[0028] Fig.17 It is a schematic diagram of a structure in which a detection circuit provided in an embodiment of the present application is electrically connected to a main radiator;

[0029] Fig.18 is a schematic structural diagram of a detection circuit provided in an embodiment of the present application being electrically connected to a first parasitic radiator;

[0030] Fig.19 is a schematic structural diagram of a detection circuit provided in an embodiment of the present application being electrically connected to a second parasitic radiator;

[0031] Fig. 20 is a block diagram of a second control circuit provided in an embodiment of the present application;

[0032] Fig.21It is an S parameter curve of the antenna assembly of the foldable electronic device provided by the embodiment of the present application in the unfolded state, the first switch circuit is in the on state and the second switch circuit is in the off state when folded, the first switch circuit is in the off state and the second switch circuit is in the closed state when folded, and the first switch circuit and the second switch circuit are both in the on state when folded;

[0033] Fig. 22 and Fig.23 is a current distribution diagram of an operating mode in which the first switch circuit is in an on state and the second switch circuit is in an off state when the foldable electronic device provided by an embodiment of the present application is folded;

[0034] Fig.24 and Fig.25 is a current distribution diagram of a working mode in which the first switch circuit and the second switch circuit are both in a conducting state when the foldable electronic device provided by an embodiment of the present application is folded;

[0035] Fig.26 This is a comparison diagram of the efficiency of the antenna assembly provided in the embodiment of the present application and the antenna assembly opposite to the slot.

[0036] Description of Figure Numbers:

[0037] Foldable electronic device 1000; foldable body 10; antenna assembly 100; first body 11; second body 13; first shell 41; second shell 42; flexible display screen 200; first fixing portion 210; bending portion 220; second fixing portion 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; feeding point B; matching circuit M1; second free end C; first grounding point D; third free end E; second grounding point F; connection point G; controller 40; first switch circuit SW1; second switch circuit SW2; detection module 50; first detector 51; second detector 52; detection circuit 60; third switch circuit SW3; matching circuit M1; first tuning circuit M2; second tuning circuit M3. DETAILED DESCRIPTION

[0038] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

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

[0040] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0041] See also Figure 1 , Figure 1 A schematic diagram of a foldable electronic device provided in an embodiment of the present application. The foldable electronic device 1000 includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, or other device with a communication function and capable of being folded or unfolded. The present application embodiment is described using a mobile phone as an example, and other electronic devices may refer to this embodiment.

[0042] For ease of description, see Figure 2 , the thickness direction of the foldable electronic device 1000 is defined as the Z-axis direction, the length direction is the Y-axis direction, and the width direction is the X-axis direction, and the Z-axis, Y-axis, and X-axis are perpendicular to each other. The present application does not limit the size of the foldable electronic device 1000 in the length direction and the width direction. In some embodiments, the size of the foldable electronic device 1000 in the length direction is greater than the size in the width direction. In other embodiments, the size of the foldable electronic device 1000 in the width direction is greater than or equal to the size in the length direction.

[0043] See also Figure 3 The foldable electronic device 1000 provided in the embodiment of the present application at least includes a foldable body 10 and an antenna assembly 100 .

[0044] See also 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 embodiment of the present application, the movably connected state is not limited to a sliding connection, a rotating connection, or a combination of rotating and sliding, so that the first body 11 and the second body 13 are transformed from a folded state to an unfolded state, or from an unfolded state to a folded state.

[0045] The following is an example of the environment in which the antenna assembly 100 of the foldable electronic device 1000, the foldable body 10, etc. is located with reference to the accompanying drawings.

[0046] See also Figure 2 , the foldable electronic device 1000 also includes a first shell 41 and a second shell 42. The first shell 41 is covered on the outside of the first body 11, and the second shell 42 is covered on the outside of the second body 13. Wherein, each shell includes a bottom plate (also called a back cover) and a frame surrounding the periphery of the bottom plate. The bottom plate and the frame around the periphery include a receiving space. Wherein, the radiator of the antenna assembly 100 can be a part of the frame. Wherein, the first body 11 is arranged on the bottom plate of the first shell 41 (received in the first shell), and the second body 13 is arranged on the bottom plate of the second shell 42 (received in the second shell). The receiving space is also used to accommodate devices such as a main board, a camera module, a receiver module, a battery, and various sensors. The material of the foldable body 10 is a metal conductive material. The present application is not limited to the shapes of the first body 11 and the second body 13. Optionally, the first body 11 can be roughly rectangular, and the second body 13 can be roughly rectangular, and their shapes are not specifically limited, including but not limited to rectangular, square, irregular, etc. The foldable body 10 is provided with through holes, notches, grooves, etc. to accommodate components.

[0047] The present application does not make any specific limitation on the foldable body 10. Optionally, the foldable body 10 includes but is not limited to a middle plate inside the middle frame of the foldable electronic device 1000. The middle plate is used to carry circuit boards, form receiving slots for receiving electronic devices, avoid gaps, etc. The middle plate can be made of metal, non-metal, or a combination of metal and non-metal. When the middle plate is made of metal, such as magnesium-aluminum alloy, the middle plate can also be used as a reference ground system for the foldable electronic device 1000.

[0048] In other embodiments, the floor and the frame are separate structures, and the middle plate and the frame are interconnected and integrated.

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

[0050] The unfolded state is when the first body 11 is translated from the folded state to an overlap area with the second body 13 that is smaller than a preset area, and the preset area is, for example, 20%, 15%, 10%, 5%, 1%, 0%, etc. of the area of ​​the first body 11. At this time, the foldable electronic device 1000 includes but is not limited to a slide-type mobile phone.

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

[0052] The unfolded state may also be that the first body 11 is flipped from the folded state to an overlap area with the second body 13 that is less than a preset area, and the preset area is, for example, 20%, 15%, 10%, 5%, 1%, 0%, etc. of the area of ​​the first body 11. At this time, the foldable electronic device 1000 includes but is not limited to a foldable mobile phone.

[0053] See also Figure 4 The first body 11 and the second body 13 are connected to each other by a rotating shaft. The axial direction of the rotating shaft is the X-axis direction. The first body 11 and / or the second body 13 rotate around the rotating shaft to a folded state or an unfolded state. Figure 4 The solid line in the middle is in the folded state, and the first body 11 is located Figure 4 The dotted line in the middle indicates the expanded state.

[0054] The embodiment of the present application is described by taking the rotational connection between the first body 11 and the second body 13 as an example.

[0055] See also Figure 2, the electronic device 1000 also includes a flexible display screen 200. The flexible display screen 200 is arranged on the front side of the foldable main body 10 (the front side refers to the direction facing the user when the user normally uses the flexible display screen 200). The flexible display screen 200 includes a first fixing portion 210, a bending portion 220, and a second fixing portion 230 arranged in sequence. The first fixing portion 210 is fixedly connected to the first shell 41, and the second fixing portion 230 is fixedly connected to the second shell 42, and the fixing method thereof includes but is not limited to gluing, etc. The bending portion 220 is arranged on the rotating connection mechanism, and the connection method between the two can be a fixed connection or a non-connected state. The bending portion 220 bends when the foldable electronic device 1000 is used, and its shape when bent includes but is not limited to a water drop shape or a U shape.

[0056] The above is an explanation of the foldable electronic device 1000 being a slide-type mobile phone or a flip-type mobile phone.

[0057] See also Figure 5 The first body 11 includes a first connecting edge 112 and a first free edge 111 that are disposed opposite to each other. The first body 11 is substantially rectangular. The first connecting edge 112 and the first free edge 111 are edges at two ends along the Y-axis direction. The first body 11 also includes a first side edge 113 and a second side edge 114 that are disposed opposite to each other and are both connected between the first free edge 111 and the first connecting edge 112. The first side edge 113 and the second side edge 114 are edges at two ends along the X-axis direction.

[0058] See also Figure 5 The second body 13 includes a second connecting edge 132 and a second free edge 131 which are arranged opposite to each other. The second body 13 is roughly rectangular. The second connecting edge 132 and the second free edge 131 are edges at two ends along the Y-axis direction. The second body 13 also includes a third side edge 133 and a fourth side edge 134 which are arranged opposite to each other and are both connected between the second free edge 131 and the second connecting edge 132. The third side edge 133 and the fourth side edge 134 are edges at two ends along the X-axis direction.

[0059] See also Figure 5 , the first body 11 and the second body 13 are both conductive parts. That is, the first body 11 and the second body 13 are both conductive structures. When the first body 11 and the second body 13 are folded, the first body 11 and the second body 13 are arranged opposite to each other and close to each other, and a capacitor structure is formed between the first body 11 and the second body 13. The first body 11 and the second body 13 are similar to two adjacent conductive plate structures.

[0060] In one embodiment, the first connecting edge 112 and the second connecting edge 132 are rotatably electrically connected via the electrical connector 12. When the first body 11 is folded relative to the second body 13, the first body 11 and the second body 13 are folded in half. The first free edge 111 and the second free edge 131 are aligned with each other and spaced apart. In other words, the lengths of the first body 11 and the second body 13 in the Y-axis direction are similar or the same.

[0061] See also Figure 5 When flattened, the first side edge 113 is collinearly arranged with the third side edge 133, and the second side edge 114 is collinearly arranged with the fourth side edge 134. When folded, the first side edge 113 is aligned with the third side edge 133 and spaced apart; the second side edge 114 is aligned with the fourth side edge 134 and spaced apart; and the first free edge is aligned with the second free edge and spaced apart.

[0062] See also Figure 6 and Figure 7 When folded, the first free edge 111 and the second free edge 131 are disconnected, and the first connecting edge 112 and the second connecting edge 132 are shorted. The foldable body 10 forms a slit cavity structure with three sides being open, i.e., disconnected ends, and one side being a shorted end.

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

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

[0065] The following is a specific example description of the location of the antenna assembly 100 provided in the embodiment of the present application with reference to the accompanying drawings.

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

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

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

[0069] Optional, see Figure 8 The first extending edge may be one of the first side edge 113 and the third side edge 133 , and the second extending edge may be the other of the first side edge 113 and the third side edge 133 .

[0070] For optional reference, see Figure 5 The first extending edge may be one of the second side edge 114 and the fourth side edge 134 , and the second extending edge may be the other of the second side edge 114 and the fourth side edge 134 .

[0071] For optional reference, see Fig. 9 The first extending edge may be one of the first free edge 111 and the second free edge 131 , and the second extending edge may be the other of the first free edge 111 and the second free edge 131 .

[0072] Optionally, the first body 11 is the upper half of the foldable electronic device 1000, and the second body 13 is the lower half of the foldable electronic device 1000. When the foldable electronic device 1000 is in the unfolded vertical screen use state, the lower half of the foldable electronic device 1000 is the part facing the ground.

[0073] The specific structure of the antenna assembly 100 provided in the embodiment of the present application is specifically described below in conjunction with the accompanying drawings. The antenna assembly 100 provided in the present application can be used in an embodiment in which the first body 11 and the second body 13 are conductively connected or non-conductively connected. The main radiator 21 and the first parasitic radiator 22 are arranged on the second side 114, and the second parasitic radiator 23 is arranged on the fourth side 134.

[0074] See also Figure 5, the main radiator 21 is arranged on the first body 11. Optionally, the main radiator 21 is arranged on one side of the first body 11. The orthographic projection of the main radiator 21 in the thickness direction does not overlap with the orthographic projection of the first 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 arranged along the second side edge 114.

[0075] The material of the main radiator 21 is a conductive material, including but not limited to metal, alloy, conductive oxide, conductive polymer, graphene, etc. The form of the main radiator 21 includes but is not limited to the metal frame of the mobile phone, the metal frame embedded in the plastic frame, the metal radiator located in the frame or on the surface, the flexible printed circuit board antenna formed on the flexible printed circuit board (Flexible Printed Circuit board, FPC), the laser direct structured antenna by laser direct structure (Laser Direct Structuring, LDS), the printed direct structured antenna by printing direct structure (Print Direct Structuring, PDS), the conductive sheet antenna (such as a metal bracket antenna), etc. In this embodiment, the main radiator 21 takes the metal frame of the mobile phone as an example.

[0076] Optionally, the present 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 a strip, a sheet, a rod, a coating, a film, and the like. Figure 5 The main radiator 21 shown is only an example and does not limit the shape of the main radiator 21 provided in the present application. In the present embodiment, the main radiator 21 is in a strip shape. The present application does not limit the extension trajectory of the main radiator 21. In the present embodiment, the main radiator 21 is in a straight line shape. 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 with uniform width on the extension trajectory, or may be a strip with varying widths such as a gradient width and a widened area. In the present embodiment, the main radiator 21 is roughly in a strip shape.

[0077] See also Figure 5 , the main radiator 21 includes a first free end A and a feeding point B which are spaced apart. The first free end A is an end where other conductive structures are physically disconnected. The present application does not specifically describe the position of the feeding point B on the main radiator 21. Optionally, the feeding point B may be the other end of the main radiator 21, or a position between the two ends. The specific position of the feeding point B is described in detail in the subsequent implementation manner.

[0078] The signal source 24 is electrically connected to the feeding point B. The signal source 24 is electrically connected to the feeding point B, and is used to feed an excitation current to the main radiator 21 .

[0079] Optionally, the signal source 24 includes but is not limited to a radio frequency transceiver chip, etc. The signal source 24 is used to transmit a radio frequency signal (radio frequency current), and the radio frequency signal is transmitted to the main radiator 21 to stimulate the main radiator 21 to generate a resonant current and form a resonant mode to receive or transmit an electromagnetic wave signal covering a required frequency band, covering the frequency band corresponding to the resonant current.

[0080] In the embodiment of the present application, the signal source 24 is disposed on the main board. The main board is disposed on the foldable body 10. The electrical connection method between the signal source 24 and the feeding point B includes but is not limited to a method such as a conductive spring, welding, a coaxial line, a microstrip line, or a conductive adhesive. Specifically, the signal source 24 is electrically connected to the feeding point B through a feeding spring (conductive spring) disposed on the main board.

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

[0082] Specifically, the matching circuit M1 includes but is not limited to a capacitor, or an inductor, a series device of a capacitor and an inductor, a parallel device of a capacitor and an inductor, the above series device in parallel with a capacitor, the above series device in parallel with an inductor, two of the above series devices in parallel, two of the above parallel devices in series, and so on.

[0083] See also Figure 5 , the first parasitic radiator 22 is arranged on the first body 11. The structure, shape and material of the first parasitic radiator 22 refer to the structure, shape and material of the main radiator 21. The positional relationship between the first parasitic radiator 22 and the first body 11 can refer to the positional relationship between the main radiator 21 and the first body 11. Optionally, the first parasitic radiator 22 can be a part of the frame. With the first extension edge as the second side edge 114, at least part of the first parasitic radiator 22 is arranged along the second side edge 114. Optionally, the main radiator 21 can be closer to the first connecting edge 112 relative to the first parasitic radiator 22. Optionally again, the first parasitic radiator 22 can be closer to the first connecting edge 112 relative to the main radiator 21.

[0084] See also Figure 5, the 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 an end physically disconnected from other conductive structures. The distance between the first free end A and the second free end C is about 0.5-2.5 mm, but is not limited to this data. When the main radiator 21 is excited by the signal source 24, the second free end C of the first parasitic radiator 22 forms a capacitor with the first free end A of the main radiator 21, so that the first parasitic radiator 22 can resonate under the excitation of the signal source 24.

[0085] See also Figure 5 , the first grounding point D is an end of the first parasitic radiator 22 away from the second free end C. The first grounding point D is grounded. When the first body 11 is a conductive member and is a part of the 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 a conductive spring, a physical connection (interconnected as one), welding, through a coaxial line, through a microstrip line, through a conductive adhesive, etc.

[0086] See also Figure 5 The second parasitic radiator 23 is disposed on the second body 13. The structure, shape, and material of the second parasitic radiator 23 refer to the structure, shape, and material of the main radiator 21. The second parasitic radiator 23 is disposed on one side of the second body 13. Optionally, the second parasitic radiator 23 is a part of the frame, and the second parasitic radiator 23 is disposed along the fourth side 134.

[0087] See also Figure 5 The second parasitic radiator 23 includes a third free end E and a second ground point F. The third free end E is an end physically disconnected from other conductive structures.

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

[0089] See also 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 superimposed 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 area where the second parasitic radiator 23 is located. The main radiator 21 and the second parasitic radiator 23 are spaced apart from each other and coupled. The direction in which the feeding point B points to the first free end A is opposite to the direction in which the second grounding point F points to the third free end E. That is, the free end of the main radiator 21 points in the opposite direction 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 is aligned with the fourth side 134, 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, and the orientation of the first opening is opposite to the orientation of the second opening when folded.

[0091] In this embodiment, the first body 11 and the second body 13 are both conductive structures. When the first body 11 and the second body 13 are folded, the first body 11 and the second body 13 form a capacitor structure that faces each other and has a small gap between them. When the signal source 24 excites the main radiator 21, the capacitor structure formed by the first body 11 and the second body 13 has a current distribution, and an electric field is formed between the first body 11 and the second body 13 (the direction of the electric field is from the first body 11 to the second body 13, or the second body 13 to the first body 11). Among them, the current flow direction on the first body 11 is opposite to the current flow direction on the second body 13. For example, the current on the first body 11 is from the first free edge 111 to the first connecting edge 112, and the current on the second body 13 is 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 end of the main radiator 21 and the free end of 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. The reverse currents on the main radiator 21 and the second parasitic radiator 23 will not only lead to the mutual cancellation of far-field energy, thereby reducing the efficiency of the frequency band supported by the main radiator 21, but also make it impossible to form a resonant mode that improves efficiency.

[0092] In this embodiment, the free end of the main radiator 21 is designed to point in the opposite direction to the free end of the second parasitic radiator 23. This is in accordance with 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, and avoids the formation of reverse current on the main radiator 21 and the second parasitic radiator 23; it is beneficial for the main radiator 21 and the second parasitic radiator 23 to couple and form a resonance mode together.

[0093] In the thickness direction of the foldable body 10, the second parasitic radiator 23 is opposite to and coupled with at least part of 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 is opposite to and spaced from the main radiator 21 in the thickness direction, and the present application does not make a specific limitation on this spacing. When the signal source 24 excites the main radiator 21 to generate current, a capacitor structure is formed between the second parasitic radiator 23 and the main radiator 21, so that the second parasitic radiator 23 can 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 form a resonance mode together. At this time, the second parasitic radiator 23 cannot be coupled with the main radiator 21, and thus cannot form a resonance mode together with the main radiator 21. When the foldable body 10 is in the folded state, since the first parasitic radiator 22 and the second parasitic radiator 23 are both close to the main radiator 21, the conditions for forming a coupling capacitor structure 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 are coupled with the main radiator 21 to form a resonance mode together, so as to improve the frequency band supported by the main radiator 21.

[0095] The foldable electronic device 1000 provided in the embodiment of the present application is characterized in that a main radiator 21 is arranged on a first extended edge of a first body 11, the main radiator 21 includes a first free end A and a feeding point B which are arranged at intervals; a signal source 24 is electrically connected to the feeding point B, and the signal source 24 is used to excite the main radiator 21 to generate a resonant mode; a first parasitic radiator 22 is at least partially arranged on a second side edge 114 of the first body 11, the 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 can generate a resonant mode under the excitation of the signal source 24, a second parasitic radiator 23 is arranged on a second side edge 114 of the second body 13, and the second parasitic radiator 23 includes a third free end E and a second grounding point F, and the foldable electronic device 1000 is characterized in that When the stacked body 10 is in a folded state, the direction in which the feeding point B points to the first free end A is opposite to the direction in which the second grounding point F points to the third free end E, and the second parasitic radiator 23 is opposite to and coupled with at least a portion of the main radiator 21, and 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 with the main radiator 21 in the unfolded state, and generates a resonant mode to cover the required frequency band, 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 with the main radiator 21 when folded, and generate a resonant mode to cover the required frequency band and improve efficiency, thereby improving the antenna performance of the foldable electronic device 1000 when folded and unfolded.

[0096] The present application does not specifically limit the relative lengths of the main radiator 21 and the second parasitic radiator 23 .

[0097] See also Figure 7 In the folded state, the orthographic projection of the second ground point F in the thickness direction of the foldable body 10 is located on the first parasitic radiator 22. The orthographic projection of the third free end E in the thickness direction of the foldable body 10 is located on the main radiator 21.

[0098] Specifically, when folded, the positive projection of the second grounding point F in the direction from the second extension edge (fourth side 134) to the first extension edge (second side 114) (ie, the thickness direction) is located on the side of the second free end C away from the feeding point B.

[0099] Specifically, the orthographic projection of the third free end E in the direction from the second extension edge (fourth side 134 ) to the first extension edge (second side 114 ) (ie, the thickness direction) 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 in which the first extension edge extends. That is, a portion of the second parasitic radiator 23 is directly opposite to the main radiator 21, and another portion of the second parasitic radiator 23 extends out of the area directly opposite to the main radiator 21. In this embodiment, another portion of the second parasitic radiator 23 is directly opposite to the first coupling slot 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 reverse current strong points on the second parasitic radiator 23 and the main radiator 21 will not be directly opposite, 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 when the reverse current strong points are directly opposite.

[0101] Further, an orthographic projection of a third free end E of the second parasitic radiator 23 on the main radiator 21 is spaced from an end of the main radiator 21 away from the first free end A. An orthographic projection of a second grounding point F of the second parasitic radiator 23 on the first parasitic radiator 22 is spaced 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 on the first parasitic radiator 22, so as to avoid that when a reverse current is formed on the second parasitic radiator 23 and the first parasitic radiator 22, the strong points of the reverse current on the second parasitic radiator 23 and the first parasitic radiator 22 are directly opposite to each other, thereby effectively avoiding the problem of the far-field energy of the reverse current on the first parasitic radiator 22 and the second parasitic radiator 23 canceling each other when the strong points of the reverse current are directly opposite to each other.

[0103] When the second grounding point F and the third free end E of the second parasitic radiator 23 are directly opposite to the area where the main radiator 21 is located, the main radiator 21 and the second parasitic radiator 23 cannot bring about efficiency improvement. When the second grounding point F of the second parasitic radiator 23 is directly opposite to the side of the first free end A of the main radiator 21 away from the feeding 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, at this time, 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 the efficiency of the main radiator 21 cannot be improved.

[0104] The above design further avoids the problem of the strong current points facing each other when the reverse current is formed between the main radiator 21 and the second parasitic radiator 23, and between the main radiator 21 and the first parasitic radiator 22, thereby effectively avoiding the problem of the far-field energy of the reverse current between the first parasitic radiator 22 and the main radiator 21, and between the main radiator 21 and the second parasitic radiator 23 canceling each other out.

[0105] The present application does not specifically limit the type of the main radiator 21 . The specific type of the main radiator 21 and the corresponding resonance mode generated are exemplified below with reference to the accompanying drawings.

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

[0107] In the first implementation, see Figure 5 , the connection point G is located at the end of the main radiator 21 away from the first free end A, the feeding point B is located between the connection point G and the first free end A, and the connection point G is grounded. That is, the main radiator 21 also includes a third grounding point ( Figure 5 The third grounding point and the first free end A are respectively located at opposite ends of the main radiator 21, and the feeding 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, see Fig.10 , the connection point G is located at an end of the main radiator 21 away from the first free end A, and the feeding point B is located at the connection point G. That is, the feeding point B and the first free end A are respectively 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, see Fig.11 , one end of the main radiator 21 away from the first free end A is a free end, which is disconnected from other conductive structures. The feeding point B is located between the two free ends, and the feeding point B is the connection point G. The matching circuit also has a grounding point, which is grounded. That is, the main radiator 21 also includes a fourth free end, and the fourth free end and the first free end A are respectively located at opposite ends of the main radiator 21, and the feeding 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-shaped antenna.

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

[0111] See also Fig.12, the main radiator 21 of the antenna assembly 100 provided in this embodiment forms a mouth-to-mouth antenna with the first parasitic radiator 22. The current of the above-mentioned 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 between the second free end C and the first grounding 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 unidirectional current 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 of the first resonance mode is that on the main radiator 21, there is a relatively strong current from the connection point G to the first free end A, and a relatively weak current from the second free end C and the first grounding point D. Among them, the resonance mode on the main radiator 21 makes a major contribution to the efficiency of the first resonance mode, and the frequency band supported by the resonance mode on the main radiator 21 determines the effective frequency band of the first resonance mode. In other words, the frequency band supported by the first resonance mode is the first frequency band.

[0113] It should be noted that the first frequency band supported by the first resonance mode described in the present application is the frequency range corresponding to the return loss in the S parameter of -4dB, -5dB, -6dB or other values. The second frequency band supported by the second resonance mode described in the present application is the frequency range corresponding to the return loss in the S parameter of -4dB, -5dB, -6dB or other values.

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

[0115] See also Fig.13 , the signal source 24 excites the main radiator 21 and the first parasitic radiator 22 to form a second resonant mode supporting a second frequency band.

[0116] The current of 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 the current intensity of the third sub-current.

[0117] Specifically, the second resonance mode is a quarter wavelength mode of the first parasitic radiator 22. The second resonance mode forms a weaker current on the main radiator 21 and a stronger 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 of the second resonance mode is that on the main radiator 21, there is a relatively weak current flowing from the connection point G to the first free end A, and a relatively strong current flowing from the second free end C and the first grounding point D. Among them, the resonance mode on the first parasitic radiator 22 makes a major contribution to the efficiency of the second resonance mode, and the frequency band supported by the resonance mode on the first parasitic radiator 22 determines the effective frequency band of the second resonance mode. In other words, the frequency band supported by the second resonance mode is the second frequency band.

[0119] The first resonance mode is also called a high mode radiating mode, and the second resonance mode is also called a 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 the resonant frequency of the first resonant mode, for example, less than 1 GHz, but not limited to this data. For example, the difference between the resonant frequency of the second resonant mode and the resonant frequency 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 the resonant frequency 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 the resonant frequency of the first resonant mode and the distance between them is relatively large, the second resonant mode dominated by the first parasitic radiator 22 has little effect on the first resonant mode dominated by the main radiator 21, that is, the first parasitic radiator 22 has little effect on the current distribution (current traction) on the main radiator 21, and the first parasitic radiator 22 cannot guide the electric field on the main radiator 21, thereby improving 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 the center frequency 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, generating a radiation efficiency (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 a high-mode radiation mode and a high-mode balanced mode, the radiation efficiency of the frequency band supported by the main radiator 21 is improved, thereby increasing the efficiency bandwidth and improving the radiation efficiency within the antenna band (wave boost).

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

[0125] In the present application, the main radiator 21 is a T-type antenna, an IFA antenna, a monopole antenna, etc., which can generate the above-mentioned high-mode radiation mode and high-mode balanced mode.

[0126] The above is a resonance mode jointly formed by the main radiator 21 and the first parasitic radiator 22 under the excitation of the signal source 24 . The following is an explanation of a resonance mode jointly formed by the main radiator 21 and the second parasitic radiator 23 under the excitation of the signal source 24 .

[0127] See also Fig.14 When the foldable body 10 is in the folded state, the signal source 24 excites the main radiator 21 to form a third resonance mode supporting a third frequency band. The current of the third resonance 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 , wherein the second parasitic radiator 23 generates a current in the opposite direction to 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 of the third resonant mode includes the current distributed from the connection point G to the first free end A and the current distributed from the third free end E and the second grounding point F. Among them, the current generated by the third resonant mode on the second parasitic radiator 23 and the current direction generated by the capacitor plate structure formed by the first body 11 and the second body 13 offset each other, so the current reflected on the second parasitic radiator 23 is extremely weak. Therefore, in this embodiment, from the performance point of view, the current of the third resonant mode includes the fifth sub-current distributed from the connection point G to the first free end A. The current flows from the connection point G to the first free end A, for example.

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

[0131] The first parasitic radiator 22 is not considered above. When the first parasitic radiator 22 and the second parasitic radiator 23 are coupled with the main radiator 21 at the same time, the resonance mode generated by the first parasitic radiator 22, the second parasitic radiator 23 and the main radiator 21 is the same as the current distribution of the first resonance mode mentioned above. This is because the unidirectional current generated by the coupling of the main radiator 21 on the second parasitic radiator 23 and the reverse current generated by the capacitor plate structure formed by the first body 11 and the second body 13 are offset.

[0132] See also Fig.15 , while generating the third resonance mode, the signal source 24 also excites the main radiator 21 and the second parasitic radiator 23 to form a fourth resonance mode supporting a fourth frequency band. The current of the fourth resonance 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 and the second grounding point F. The direction of the sixth sub-current is opposite to that of the seventh sub-current. The current intensity of the seventh sub-current is greater than the current intensity of the sixth sub-current.

[0133] Specifically, the fourth resonance mode is a quarter wavelength mode of the second parasitic radiator 23. The fourth resonance mode forms a weaker current on the main radiator 21 and a stronger 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 of the fourth resonance mode is that on the main radiator 21, there is a relatively weak current flowing from the connection point G to the first free end A, and a relatively strong current flowing from the third free end E and the second grounding point F. Among them, the resonance mode on the second parasitic radiator 23 makes a major contribution to the efficiency of the fourth resonance mode, and the frequency band supported by the resonance mode on the second parasitic radiator 23 determines the effective frequency band of the fourth resonance mode. In other words, the frequency band supported by the fourth resonance mode is the fourth frequency band.

[0135] In this embodiment, the fourth frequency band and the second frequency band may cover the same frequency band, for example, both cover the B41 frequency band. Further, by designing the first parasitic radiator 22 and the second parasitic radiator 23 to have the same or similar electrical length, the resonant frequency of the fourth resonance mode is the same as the resonant frequency formed by the second resonance mode. Furthermore, when folded, because the efficiency of the second resonance mode formed by the first parasitic radiator 22 and the main radiator 21 in supporting the B41 frequency band is reduced, the fourth resonance mode formed by the first parasitic radiator 22 and the main radiator 21 may be replaced by the second parasitic radiator 23 to support the B41 frequency band, or, on the basis of retaining the second resonance mode, the fourth resonance mode between the second parasitic radiator 23 and the main radiator 21 may be added to support the B41 frequency band to improve 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 point of the fourth frequency band and the center frequency point of the third frequency band is less than 1 GHz.

[0137] In other words, the electrical length of the second parasitic radiator 23 is smaller than the electrical length of the main radiator 21. The resonance frequency point of the third resonance mode is located before the resonance frequency point of the fourth resonance mode.

[0138] The resonant frequency of the fourth resonant mode is close to the resonant frequency of the third resonant mode, for example, less than 1 GHz, but not limited to this data. For example, the difference between the resonant frequency of the fourth resonant mode and the resonant frequency 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 the resonant frequency 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 the resonant frequency of the third resonant mode and the distance between them is relatively large, the fourth resonant mode dominated by the second parasitic radiator 23 has little effect on the third resonant mode dominated by the main radiator 21, that is, the second parasitic radiator 23 has little effect on the current distribution (current traction) on the main radiator 21, and the second parasitic radiator 23 cannot guide the electric field on the main radiator 21, thereby improving 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 the center frequency 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, generating a radiation efficiency (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 radiation branch and the frequency band supported by the second parasitic radiator 23 form a continuous frequency band with a better bandwidth.

[0141] The first parasitic radiator 22 is not considered above. When the first parasitic radiator 22 and the second parasitic radiator 23 are coupled to the main radiator 21 at the same time, the current of the resonant mode generated by the first parasitic radiator 22, the second parasitic radiator 23 and the main radiator 21 includes a relatively weak current flowing from the connection point G to the first free end A on the main radiator 21, a relatively strong current flowing from the second free end C and the first grounding point D, and a relatively strong current flowing from the third free end E and the second grounding point F. When the electrical lengths of the first parasitic radiator 22 and the second parasitic radiator 23 are the same, the resonance mode formed by the current on the first parasitic radiator 22 and the current on the second parasitic radiator 23 may be the same resonance 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 resonance modes are formed, one of which is a 1 / 4 wavelength mode dominated by the main radiator 21, and the other is a 1 / 4 wavelength mode dominated by the first parasitic radiator 22 and the second parasitic radiator 23. The latter 1 / 4 wavelength mode is a 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 description explains that in the unfolded state, the main radiator 21 and the first parasitic radiator 22 form a mouth-to-mouth antenna, and form a radiation mode and a balanced mode to improve the frequency band efficiency supported by the main radiator 21. Taking the case where the main radiator 21 supports the B3 frequency band and the first parasitic radiator 22 supports the B41 frequency band as an example, the formation of the radiation mode and the balanced mode can improve the efficiency of the B3 frequency band; in the folded state, the main radiator 21 can form the above-mentioned radiation mode and balanced mode with the first parasitic radiator 22, and can also couple with the second parasitic radiator 23 to form a third resonance mode similar to the radiation mode, and a fourth resonance mode similar to the balanced mode. When the efficiency of the B3 frequency band and the B41 frequency band is reduced during folding, the second parasitic radiator 23 can be switched to couple with the main radiator 21, or the first parasitic radiator 22 and the second parasitic radiator 23 can be coupled with the main radiator 21 to improve the efficiency of the B3 frequency band and the B41 frequency band. In addition, the electrical length of the second parasitic radiator 23 is designed to be different from the electrical length of the first parasitic radiator 22. For example, the second parasitic radiator 23 supports the B1 band, and the antenna assembly 100 can support the B3 band + the B1 band + the B41 band, or support the B1 band + the B41 band when folded.

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

[0144] The working state of the first parasitic radiator 22 means that the first parasitic radiator 22 can couple with the main radiator 21 and support the resonance mode together under the action of the signal source 24. The first parasitic radiator 22 is grounded.

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

[0146] See also Fig.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 a working state or a suspended state, and is used to control the second parasitic radiator 23 to be in a working 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 a working state when the foldable body 10 is in a folded state.

[0148] By setting the controller 40 to control the working states of the first parasitic radiator 22 and the second parasitic radiator 23 respectively, the antenna assembly 100 includes the following working modes when the foldable electronic device 1000 is folded: the first is that the first parasitic radiator 22 is coupled with the main radiator 21, and the second parasitic radiator 23 is not working. The second is that the second parasitic radiator 23 is coupled with the main radiator 21, and the first parasitic radiator 22 is not working. The third is that both the first parasitic radiator 22 and the second parasitic radiator 23 are coupled with the main radiator 21. Each mode also corresponds to a different scenario, so that the antenna assembly 100 can cope with different usage scenarios when folded, has more working modes, and can achieve improved frequency band efficiency or increased supported frequency bands.

[0149] For details, please refer to Figure 5 , the antenna assembly 100 further includes a first switch circuit SW1. The first switch circuit SW1 is electrically connected to the first grounding point D, and the other end of the first switch circuit SW1 is grounded. The controller 40 is electrically connected to the first switch circuit SW1. The first switch circuit SW1 includes a switch tube, etc. The controller 40 is electrically connected to the first switch circuit SW1, and is used to control the conduction state of the first switch circuit SW1 to the current. Among them, the conduction state includes a short circuit state or a low impedance state. Specifically, when the first switch circuit SW1 is in a short circuit state between the first grounding point D and the reference ground or is 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 resonant 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 switch circuit SW1 is in an open circuit state between the first grounding point D and the reference ground or is 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 suspended state, and the first parasitic radiator 22 is in a suspended state.

[0150] Optionally, the first switch circuit SW1 may only include a switch tube to switch the first switch circuit SW1 between a short circuit state and an open state. Of course, the first switch circuit SW1 may also include a switch tube, a capacitor, an inductor and other components to switch the first switch circuit SW1 between a short circuit state, a low impedance state, an open state and a high impedance state.

[0151] See also Figure 5, the antenna assembly 100 also includes a second switch circuit SW2. The second switch circuit SW2 is electrically connected to the second grounding point F, and the other end of the second switch circuit SW2 is grounded. The controller 40 is electrically connected to the second switch circuit SW2. The second switch circuit SW2 includes a switch tube, etc. The controller 40 is electrically connected to the second switch circuit SW2, and is used to control the conduction state of the second switch circuit SW2 to the current. Among them, the conduction state includes a short circuit state or a low impedance state.

[0152] Specifically, when the second switch circuit SW2 is in a short-circuit state between the second ground point F and the reference ground or is in a low-impedance state for the frequency band that the second parasitic radiator 23 needs to support, 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 a working state. When the second switch circuit SW2 is in an open-circuit state between the second ground point F and the reference ground or is in a high-impedance state for the frequency band that the second parasitic radiator 23 needs to support, the second parasitic radiator 23 is equivalent to being in a suspended state, and at this time, the second parasitic radiator 23 is in a suspended state.

[0153] Optionally, the second switch circuit SW2 may only include a switch tube to switch the second switch circuit SW2 between a short circuit state and an open state. Of course, the second switch circuit SW2 may also include a switch tube, a capacitor, an inductor and other components to switch the second switch circuit SW2 between a short circuit state, a low impedance state, an open state and a high impedance state.

[0154] The controller 40 is used to control the antenna assembly 100 to switch between a first working mode, a second working mode, and a third working mode when the foldable body 10 is in a folded state. The first working mode is that the first switch circuit SW1 is in an on state, and the second switch circuit SW2 is in an off state. The second working mode is that the first switch circuit SW1 is in an off state, and the second switch circuit SW2 is in an on state. The third working mode is that the first switch circuit SW1 is in an on state, and the second switch circuit SW2 is in an on state.

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

[0156] In the first working 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 smaller 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 resonance mode is a high-mode radiation mode, and the second resonance 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 have good efficiency.

[0159] In the second working mode, the signal source 24 excites the main radiator 21 and the second parasitic radiator 23 to form a third resonance mode and a fourth resonance mode. The resonance current of the third resonance 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 is coupled with the main radiator 21 to support the required frequency band with good efficiency.

[0162] In the third working 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 resonance mode and a sixth resonance mode. The resonance current of the fifth resonance mode is distributed on the main radiator 21. The resonance current distribution of the fifth resonance mode is consistent with the current distribution of the resonance mode of the third resonance mode, and the specific description can be referred to the current distribution of the third resonance mode.

[0163] The intensity of the resonant current of the sixth resonant mode on the main radiator 21 is smaller 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 smaller 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, the first parasitic radiator 22 and the second parasitic radiator 23 are coupled with the main radiator 21 to support the required frequency band and have better efficiency.

[0165] In a first optional scenario, the controller 40 is used to control the first switch 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 a working 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 Fig.16 The foldable electronic device 1000 further includes a detection module 50. The detection module 50 includes at least one detector, and optionally, the detection module 50 includes a first detector 51 for detecting a folding 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 rotating shaft, or an angle detector for detecting the rotational angle of the rotating shaft, or a gyroscope for detecting the relative orientation, or a light detector, a Hall detector, a magnetic detector, etc. for detecting whether it is close.

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

[0169] Since the first parasitic radiator 22 is blocked by hands, head, etc., the frequency band supported by the first parasitic radiator 22 will be frequency-deviation, resulting in reduced efficiency or failure to support the required frequency band. Based on this problem, 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 hands, head, etc., the detection module 50 sends a monitoring signal to the controller 40. The controller 40 controls the electrical conduction state of the first switch circuit SW1 and the electrical conduction state of the second switch circuit SW2 according to the monitoring signal, thereby making the first parasitic radiator 22 suspended and the second parasitic radiator 23 in a working state. In this way, the second parasitic radiator 23 can continue to support the required frequency band with the main radiator 21 to ensure that the required supported frequency band (such as B3 and B41) can also maintain good coverage and support when the first parasitic radiator 22 is blocked when unfolding and folding.

[0170] In addition, when the first parasitic radiator 22 is shielded, controlling the first parasitic radiator 22 to be in a suspended state has less influence on the formation of a resonance mode between the second parasitic radiator 23 and the main radiator 21 than the first parasitic radiator 22 being in a working state.

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

[0172] Since the second parasitic radiator 23 is blocked by hands, head, etc., the frequency band supported by the second parasitic radiator 23 will be frequency-deviation, resulting in reduced efficiency or failure to support the required frequency band. Based on this problem, 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 hands, head, etc., the detection module 50 sends a monitoring signal to the controller 40. The controller 40 controls the electrical conduction state of the second switch circuit SW2 and the electrical conduction state of the first switch circuit SW1 according to the monitoring signal, thereby making the second parasitic radiator 23 suspended and the first parasitic radiator 22 in a working state. In this way, the first parasitic radiator 22 can continue to support the required frequency band with the main radiator 21 to ensure that the required supported frequency band (such as B3 and B41) can also maintain good coverage and support when the second parasitic radiator 23 is blocked when unfolding and folding.

[0173] In addition, when the second parasitic radiator 23 is shielded, controlling the second parasitic radiator 23 to be in a suspended state has less influence on the formation of a resonance mode between the first parasitic radiator 22 and the main radiator 21 than the second parasitic radiator 23 being in a working state.

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

[0175] Since the first parasitic radiator 22 and the second parasitic radiator 23 are both blocked by hands, heads, etc., the frequency bands supported by the first parasitic radiator 22 and the second parasitic radiator 23 will be frequency-biased, resulting in reduced efficiency or failure to support the required frequency bands. Based on this problem, when the detection module 50 detects that the foldable electronic device 1000 is in a folded state and the first parasitic radiator 22 and the second parasitic radiator 23 are both 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 switch circuit SW2 and the electrical conduction state of the first switch circuit SW1 according to the monitoring signal, thereby making the second parasitic radiator 23 in a working state and the first parasitic radiator 22 in a working state. By improving the mode efficiency of the first parasitic radiator 22 and the second parasitic radiator 23, good coverage and support for the required supported frequency bands (such as B3 and B41) can be achieved.

[0176] The controller 40 is further configured to control the first switch circuit SW1 to be in a conducting state and the second switch circuit SW2 to be in a disconnecting state or a high impedance state when the foldable body 10 is in an unfolded state.

[0177] See also Fig.17 , the foldable electronic device 1000 further includes a detection circuit 60. The detection circuit 60 is used to detect whether the subject to be detected 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 a change in capacitance. The detection circuit 60 further includes a large inductor for isolating AC to prevent the AC signal in the detection circuit 60 from affecting the RF signal on the radiator.

[0178] The subject to be measured includes but is not limited to the parts of the human body such as the head and hands with charges on the surface. The specific detection principle is: when there is no subject to be measured close to the radiator, a stable initial capacitance, such as Cnv, is formed between the radiator and the reference ground. When the subject to be measured is close to the radiator, since the subject to be measured carries charges, the electric field formed changes the initial electric field between the radiator and the reference ground, and then the capacitance between the radiator and the reference ground changes to Cnv+Cuser. The detection circuit 60 detects whether there is a subject to be measured close to the proximity sensor by detecting the 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 for detecting whether the subject to be tested is close to the foldable electronic device 1000, thereby realizing the reuse of radiators, integrating the antenna assembly 100 and the proximity sensor, and reducing the occupied space.

[0180] The detection circuit 60 and the electrically connected detection electrodes form a SAR sensor. SAR stands for Specific absorption rate in English and for specific absorption rate of biological dose (electromagnetic radiation absorbed by the human body) in Chinese.

[0181] The foldable electronic device 1000 further includes a SAR detector (not shown). The controller 40 is electrically connected to the SAR detector. The controller 40 is also used to control the antenna assembly 100 to be in the first working mode when the SAR detector detects that the second parasitic radiator 23 is blocked, and to control the antenna assembly 100 to be in the second working 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 working 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 the embodiment of the present application can also realize the intelligent switching of the first switch circuit SW1 and the second switch circuit SW2 through the SAR sensor, which can ensure the human hand performance in the B41 frequency band. When the SAR sensor senses that the finger is placed on the first parasitic radiator 22, the controller 40 controls the first switch circuit SW1 to be in an off state, the second switch circuit SW2 to be in an on state, and the second parasitic radiator 23 is operated to avoid the finger. When the SAR sensor senses that the human hand is placed on the second parasitic radiator 23, the controller 40 controls the first switch circuit SW1 to be in an on state, the second switch circuit SW2 to be in an off state, and the first parasitic radiator 22 is operated to avoid the finger, so that it can be ensured that there is a parasitic radiator in the B41 frequency band working normally without a large frequency deviation (unpredictable frequency deviation will occur when the finger is placed), thereby improving the user experience. If the finger is placed on two parasitic radiators in an extreme scenario, the controller 40 controls the first switch circuit SW1 and the second switch circuit SW2 to be in an on state at the same time to improve the antenna efficiency and reduce the frequency deviation.

[0183] Optionally, the matching circuit M1 includes a DC blocking capacitor, which is electrically connected to the main radiator 21. The DC blocking capacitor is used to isolate a DC signal or a small AC signal. The DC blocking capacitor is a circuit breaker for the DC signal or the small AC signal. The DC blocking capacitor is a large capacitor, for example, about 100 pF, but is not limited to this data.

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

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

[0187] Optional, see Fig.18When the first switch circuit SW1 is in the disconnected state, the first parasitic radiator 22 is in the suspended 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 approaching the subject to be tested, thereby detecting whether the subject to be tested is close to the antenna assembly 100.

[0188] Optionally, a DC blocking capacitor (referred to as a third DC blocking capacitor) is provided inside the first switch circuit SW1 or between the first switch circuit SW1 and the first parasitic radiator 22. The first parasitic radiator 22 is a suspended branch relative to a DC signal or a small AC signal without the first switch circuit SW1 being in a disconnected state, and can be used as a detection electrode for the proximity of the subject to be measured, to detect whether the subject to be measured is close to the antenna assembly 100.

[0189] Optional, see Fig.19 When the second switch circuit SW2 is in the disconnected state, the second parasitic radiator 23 is in a suspended 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 approaching the subject to be measured, to detect whether the subject to be measured is close to the antenna assembly 100.

[0190] Optionally, a DC blocking capacitor (called a fourth DC blocking capacitor) is provided inside the second switch circuit SW2 or between the second switch circuit SW2 and the second parasitic radiator 23. The second parasitic radiator 23 is a suspended branch relative to a DC signal or a small AC signal without the need for the first switch circuit SW1 to be in a disconnected state, and can be used as a detection electrode for the proximity of the subject to be measured, to detect whether the subject to be measured is close to the antenna assembly 100.

[0191] Optional, see Fig. 20 The antenna assembly 100 further includes a third switch circuit SW3. A fixed end of the third switch circuit SW3 is electrically connected to the detection circuit 60. A selection end of the third switch 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 switch circuit SW3. The controller 40 is used to control the selection end of the third switch circuit SW3 to switch to the first parasitic radiator 22 when the first parasitic radiator 22 is in a suspended state. The controller 40 is also used to control the selection end of the third switch circuit SW3 to switch to the second parasitic radiator 23 when the second parasitic radiator 23 is in a suspended state.

[0192] Specifically, the controller 40 is used to control the selection end of the third switch circuit SW3 to switch to the first parasitic radiator 22 when the first switch circuit SW1 is in the disconnected state and the first parasitic radiator 22 is in the suspended state. The first parasitic radiator 22 is used as a detection electrode for approaching the subject to be measured by utilizing the suspended state of the first parasitic radiator 22 to detect whether the subject to be measured is close to the antenna assembly 100. After the first parasitic radiator 22 and the detection circuit 60 detect that the subject to be measured is away from the first parasitic radiator 22, the controller 40 can control the first switch circuit SW1 to switch to a short circuit state or a low impedance state, so that the first parasitic radiator 22 can form a resonant mode with the main radiator 21, improve the radiation efficiency, and realize intelligent switching to support the required frequency band.

[0193] Specifically, the controller 40 is also used for controlling the selection end of the third switch circuit SW3 to switch to the second parasitic radiator 23 when the second switch circuit SW2 is in the disconnected state and the second parasitic radiator 23 is in the suspended state. The second parasitic radiator 23 is used as a detection electrode for approaching the subject to be measured, and detects whether the subject to be measured is close to the antenna assembly 100 by using the second parasitic radiator 23 in the suspended state. After the second parasitic radiator 23 and the detection circuit 60 detect that the subject to be measured is away from the second parasitic radiator 23, the controller 40 can control the second switch circuit SW2 to switch to the short circuit state or the low impedance state, so that the second parasitic radiator 23 can form a resonant mode with the main radiator 21, improve the radiation efficiency, and realize intelligent switching to support the required frequency band.

[0194] See also Figure 5 , the antenna assembly 100 also includes a first tuning circuit M2. The first tuning circuit M2 includes a plurality of grounded first tuning branches. One end of the first switch circuit SW1 away from the first grounding point D can be selectively electrically connected to one of the plurality of first tuning branches. The first tuning branch includes a capacitor and / or an inductor, etc. Of course, in other embodiments, the first tuning branch also includes a variable capacitor. The impedance value of each first tuning branch is different. By switching the first switch circuit SW1, the first tuning branches with different impedance values ​​are switched to be connected to the first parasitic radiator 22, and the electrical length from the first parasitic radiator 22 to the ground is changed. The first tuning circuit M2 is used to adjust the size of the frequency band of the first resonant mode.

[0195] See also Figure 5, the antenna assembly 100 also includes a second tuning circuit M3. The second tuning circuit M3 includes a plurality of grounded second tuning branches. One end of the second switch circuit SW2 away from the second grounding point F can be selectively electrically connected to one of the plurality of second tuning branches. The second tuning branch includes a capacitor and / or an inductor, etc. Of course, in other embodiments, the second tuning branch also includes a variable capacitor. The impedance value of each second tuning branch is different. By switching the second switch circuit SW2, the second tuning branches with different impedance values ​​are switched to be connected to the second parasitic radiator 23, and the electrical length from the second parasitic radiator 23 to the ground is changed. The second tuning circuit M3 is used to adjust the size of the frequency band of the second resonant mode.

[0196] In the following example, the main radiator 21 works in the B3 frequency band, and the first parasitic radiator 22 and the second parasitic radiator 23 can both work in the B41 frequency band. When folded, the first parasitic radiator 22 is staggeredly coupled with the main radiator 21, and the first switch circuit SW1 and the second switch circuit SW2 are intelligently switched to ensure the B41 frequency band performance. When the first switch circuit SW1 is in the on state and the second switch 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 switch circuit SW1 is in the off state and the second switch 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 the first switch circuit SW1 and the second switch circuit SW2 are in the on state at the same time, 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 simultaneously operate in the B41 frequency band, which can improve the B41 frequency band performance.

[0197] See also Fig.21 , Fig.21It is an S parameter curve of the antenna assembly 100 of the foldable electronic device 1000 provided in the embodiment of the present application in the unfolded state, the first switch circuit SW1 is in the on state and the second switch circuit SW2 is in the off state when folded, the first switch circuit SW1 is in the off state and the second switch circuit SW2 is in the closed state when folded, and the first switch circuit SW1 and the second switch circuit SW2 are both in the on state when folded. 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 when the first switch circuit SW1 is in the on state and the second switch circuit SW2 is in the off state when folded. Curve c refers to the S parameter curve of the antenna assembly 100 when the first switch circuit SW1 is in the off state and the second switch circuit SW2 is in the closed state when folded. Curve d refers to the S parameter curve of the antenna assembly 100 when the first switch circuit SW1 and the second switch circuit SW2 are both in the on state when folded.

[0198] It can be seen from the curve that the antenna assembly 100 provided in the present application can support the B3 frequency band and the B41 frequency band when in the unfolded state, when the first switch circuit SW1 is in the on state and the second switch circuit SW2 is in the off state when folded, when the first switch circuit SW1 is in the off state and the second switch circuit SW2 is in the closed state when folded, and when the first switch circuit SW1 and the second switch circuit SW2 are both in the on state when folded.

[0199] See also Fig.12 and Fig.13 , see Fig.12 and Fig.13 1 is a current distribution diagram of the working mode of the foldable electronic device 1000 provided in the embodiment of the present application when it is unfolded. Fig.12 In the unfolded state, the operating mode current of the B3 band is mainly the quarter-wavelength current of the main radiator 21, accompanied by the weaker quarter-wavelength unidirectional current of the first parasitic radiator 22; see Fig.13 The working mode current in the B41 band is mainly a quarter-wavelength current of the first parasitic radiator 22 , accompanied by a weaker quarter-wavelength reverse current of the main radiator 21 .

[0200] See also Fig. 22 and Fig.23 , Fig. 22 and Fig.23 This is a current distribution diagram of the working mode when the foldable electronic device 1000 provided by the embodiment of the present application is folded and the first switch circuit SW1 is in the on state and the second switch circuit SW2 is in the off state. Fig. 22The operating mode current in the B3 band is mainly the quarter-wavelength current of the main radiator 21, accompanied by the weaker quarter-wavelength unidirectional current of the first parasitic radiator 22. Fig.23 , the working mode current of the B41 frequency band is mainly the quarter-wavelength current of the first parasitic radiator 22, accompanied by the weaker quarter-wavelength reverse current of the main radiator 21. At this time, since the second switch circuit SW2 is in the off state, the second parasitic radiator 23 is suspended, and the resonant frequency of the second parasitic radiator 23 is very high. The matching circuit M1 can filter out the higher frequency band. Therefore, when the B41 frequency band is working at this time, the second parasitic radiator 23 has no reverse current, so as to reduce the offset effect of the reverse current and improve the efficiency.

[0201] See also Fig.14 and Fig.15 , Fig.14 and Fig.15 This is a current distribution diagram of the working mode when the foldable electronic device 1000 provided in the embodiment of the present application is folded and the first switch circuit SW1 is in the disconnected state and the second switch circuit SW2 is in the on state. Fig.14 , the operating mode current of the B3 band is mainly the quarter-wavelength current of the main radiator 21. Fig.15 , the working mode of the B41 frequency band is mainly the quarter-wavelength current of the second parasitic radiator 23, accompanied by the weaker quarter-wavelength reverse current of the main radiator 21. Since the first switch circuit SW1 is in the off state, the first parasitic radiator 22 is suspended, and the resonance frequency of the first parasitic radiator 22 is very high. The matching circuit M1 can filter out the higher frequency band. Therefore, when the B41 frequency band is working at this time, the first parasitic radiator 22 has no current generated, and the second parasitic radiator 23 is relatively misaligned with the main radiator 21, and the position of the large current returning to the ground is relatively offset from the main radiator 21, so the radiation efficiency is also relatively weakened.

[0202] See also Fig.24 and Fig.25 , Fig.24 and Fig.25 1 is a current distribution diagram of the working mode when the first switch circuit SW1 and the second switch circuit SW2 are both in the on state when the foldable electronic device 1000 provided by the embodiment of the present application is folded. Fig.24 , the working mode current of the B3 band is mainly the quarter-wavelength current of the main radiator 21. Fig.25 , the working mode current in the B41 band is mainly the quarter-wavelength current of the first parasitic radiator 22 and the quarter-wavelength current of the second parasitic radiator 23, accompanied by the 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 at the same time, and the overall efficiency is doubled.

[0203] See also Fig.26 , Fig.26 1 is an efficiency comparison diagram of the antenna assembly 100 provided in the embodiment of the present application and the antenna assembly with a gap opposite to each other. The antenna assembly with a gap opposite to each other means that the second parasitic radiator is directly opposite to the first parasitic radiator and has the same length, and the third parasitic radiator is directly opposite to the main radiator and has the same length. The gap between the main radiator and the first parasitic radiator is directly opposite to the gap between the second parasitic radiator and the third parasitic radiator.

[0204] As can be seen from the figure, the antenna assembly 100 provided in the embodiment of the present application can ensure the working efficiency of the B41 frequency band when folded and unfolded through intelligent switching of the switch, and the efficiency of the B41 frequency band is greatly improved when the first parasitic radiator 22 and the second parasitic radiator 23 work at the same time; the antenna assembly 100 provided in the embodiment of the present application sets the second parasitic radiator 23 and the main radiator 21 in a staggered coupling manner, and the efficiency of any parasitic radiator when working is improved compared to the design with relative gaps; in addition, the antenna assembly 100 provided in the embodiment of the present application sets the second parasitic radiator 23 and the main radiator 21 in a staggered coupling manner, and uses the SAR sensor to intelligently avoid fingers, ensuring that the B41 frequency band cannot be held.

[0205] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims

1. A foldable electronic device, characterized in that: The foldable body comprises a first body and a second body; the first body is movably connected with the second body to present a folded state or an unfolded state; the first body comprises a first extending edge, the second body comprises a second extending edge, and when the foldable body is in the folded state, the first extending edge and the second extending edge are opposite to each other in the thickness direction of the foldable body; The antenna assembly comprises: A main radiator is arranged on the first extension edge, and the main radiator includes a first free end and a feeding point which are arranged at intervals; A signal source, the signal source being electrically connected to the feeding point and used for feeding an excitation current to the main radiator; a first parasitic radiator, at least partially disposed on the first extension edge, the first parasitic radiator comprising a second free end and a first grounding point, a first coupling gap formed between the second free end and the first free end, and the first parasitic radiator being coupled to the main radiator through the first coupling gap; A second parasitic radiator is arranged on the second extension edge, 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 in which the feeding point points to the first free end is opposite to the direction in which the second grounding point points to the third free end, and in the thickness direction of the foldable body, the second parasitic radiator is opposite to and coupled with at least a portion of the main radiator.

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

3. The foldable electronic device according to claim 2, characterized in that: The antenna assembly further includes a controller, a first switch circuit and a second switch circuit, wherein the first switch circuit is electrically connected to the first ground point, and the other end of the first switch circuit is grounded; the second switch circuit is electrically connected to the second ground point, and the other end of the second switch circuit is grounded; The controller is electrically connected to the first switch circuit and the second switch circuit, and 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; wherein the first operating mode is that the first switch circuit is in an on state, and the second switch circuit is in an off state; the second operating mode is that the first switch circuit is in an off state, and the second switch circuit is in an on state; and the third operating mode is that the first switch circuit is in an on state, and the second switch circuit is in an on state.

4. The foldable electronic device according to claim 3, characterized in that: In the first working 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, and 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 smaller 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 according to claim 3, characterized in that: In the second working mode, the signal source excites the main radiator and the second parasitic radiator to form a third resonance mode and a fourth resonance mode, and the resonance current of the third resonance 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 according to claim 3, characterized in that: In the third working mode, the signal source excites the main radiator, the first parasitic radiator and the second parasitic radiator to form a fifth resonance mode and a sixth resonance mode, and the resonance current of the fifth resonance mode is distributed on the main radiator; The intensity of the resonant current of the sixth resonant mode on the main radiator is smaller 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 smaller 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 according to claim 3, characterized in that: The foldable electronic device also includes a SAR detector, and the controller is electrically connected to the SAR detector. The controller is also used to control the antenna component to be in the first operating mode when the SAR detector detects that the second parasitic radiator is blocked, and to control the antenna component to be in the second operating mode when the SAR detector detects that the first parasitic radiator is blocked, and to control the antenna component 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 according to claim 3, characterized in that: The controller is also used to control the antenna assembly to be in the first working mode when the foldable electronic device is in the unfolded state.

9. The foldable electronic device according to any one of claims 1 to 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 according to claim 9, characterized in that: The orthographic projection of the third free end of the second parasitic radiator on the main radiator is spaced apart from an end of the main radiator away from the first free end; the orthographic projection of the second grounding point of the second parasitic radiator on the first parasitic radiator is spaced apart from the first grounding point.

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

12. The foldable electronic device according to any one of claims 1 to 8, characterized in that: The antenna assembly further comprises a first tuning circuit, the first tuning circuit comprising a plurality of grounded first tuning branches, and a terminal of the first switch circuit away from the first ground point can be selectively electrically connected to one of the plurality of first tuning branches; And / or, the antenna assembly also includes a second tuning circuit, the second tuning circuit includes a plurality of grounded second tuning branches, and an end of the second switch circuit away from the second grounding point can be selectively electrically connected to one of the plurality of second tuning branches.

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

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