Foldable electronic device

Abstract

The invention provides foldable electronic equipment, which is characterized in that a first radiator is arranged on a top edge and comprises a first free end, a first feeding point and a first grounding end; the distance between the first free end and the first end and the distance between the first grounding end and the second end are both greater than or equal to a first preset avoidance distance; the first signal source excites the first radiator to generate a resonance mode supporting a GPS frequency band; at least part of the second radiator is arranged on the bottom edge, the second radiator comprises a second free end and a second grounding end, and when the foldable body is in the folded state, the direction of the first grounding end pointing to the first free end is opposite to the direction of the second grounding end pointing to the second free end. At least parts of the first radiator and the second radiator are opposite and coupled. According to the foldable electronic equipment, the efficiency of a GPS frequency band can be improved, and the antenna performance of cover closing navigation is 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] Foldable electronic devices with unfolded and folded states are gaining more and more attention because they have a large display screen when unfolded and take up little space and are easy to carry when folded. Foldable electronic devices also have a folded handheld state. How to improve the efficiency of the GPS frequency band and the antenna performance of the closed navigation have become technical problems that need to be solved. Summary of the invention

[0003] The present application provides a foldable electronic device that can improve the efficiency of the GPS frequency band and improve the antenna performance of closed-cover navigation.

[0004] The present application provides a foldable electronic device, comprising a foldable body and an antenna assembly, wherein 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 top edge, the top edge comprises a first end and a second end arranged oppositely, the second body comprises a bottom edge, when the foldable body is in the unfolded state, the top edge and the bottom edge are respectively located on opposite sides of the electronic device, and when the foldable body is in the folded state, the top edge and the bottom edge overlap in the thickness direction;

[0005] Antenna assembly, comprising:

[0006] A first radiator is arranged at the top edge, the first radiator comprises a first free end, a first feeding point and a first grounding end arranged in sequence; the distance between the first free end and the first end is smaller than the distance between the first free end and the second end, the distance between the first free end and the first end is greater than or equal to a first preset avoidance distance, the distance between the first grounding end and the second end is greater than or equal to the first preset avoidance distance; the first grounding end is grounded;

[0007] a first signal source, the first signal source being electrically connected to the first feeding point and used for feeding an excitation current to the first radiator to excite the first radiator to generate a resonant mode supporting a GPS frequency band;

[0008] A second radiator, at least a portion of the second radiator is disposed on the bottom edge, the second radiator comprises a second free end and a second grounding end which are spaced apart, and the second grounding end is grounded;

[0009] When the foldable body is in a folded state, the direction in which the first ground end points to the first free end is opposite to the direction in which the second ground end points to the second free end, and in the thickness direction of the foldable body, at least parts of the first radiator and the second radiator are opposite and coupled.

[0010] The foldable electronic device provided by the present application arranges the first radiator at the middle position of the top edge of the foldable electronic device, and reserves a preset avoidance distance between both ends of the first radiator and the corner position of the top edge, so as to avoid the first radiator being blocked by the hand when the hand is held in the folded state, thereby avoiding the frequency deviation problem caused by hand holding, so that the foldable electronic device supports the closed-cover navigation function; in the folded state, the first radiator can be coupled with the second radiator arranged in the opposite direction, and then the first radiator conducts the excitation current of the signal source to the second radiator, so that a resonant current is generated on the second radiator, so as to improve the efficiency of the GPS frequency band and improve the antenna performance of the closed-cover navigation. 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 the exploded structure of a foldable electronic device provided in an embodiment of the present application;

[0014] Figure 3 This is a schematic diagram of a foldable electronic device that can slide and fold, as provided in an embodiment of the present application;

[0015] Figure 4 This is a schematic diagram of a foldable electronic device that is rotated and folded, as provided in an embodiment of the present application;

[0016] Figure 5 This is a schematic diagram of the position layout of the first antenna assembly provided in an embodiment of the present application when it is unfolded;

[0017] Figure 6a is a schematic diagram of an antenna assembly provided by an embodiment of the present application being held by a left hand;

[0018] Figure 6b is a schematic diagram of an antenna assembly provided by an embodiment of the present application being held by a right hand;

[0019] Figure 7 is a three-dimensional schematic diagram of the first antenna assembly provided in an embodiment of the present application when folded;

[0020] Figure 8is a top view schematic diagram of the first antenna assembly provided in an embodiment of the present application when folded;

[0021] Fig. 9 is a three-dimensional schematic diagram of an antenna assembly provided in an embodiment of the present application when no parasitic branches are provided;

[0022] Fig.10 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and located in the middle of the top edge of the foldable electronic device (folded state) in free space and in the right-hand holding scenario;

[0023] Fig.11 yes Figure 7 The S curve and efficiency curve of the provided GPS-L1 antenna and located in the middle of the top edge of the foldable electronic device (folded state) in free space and in the right hand holding scenario;

[0024] Fig.12 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with parasitic branches located in the middle of the top edge of the foldable electronic device (folded state) in the right hand holding scenario;

[0025] Fig.13 is a three-dimensional schematic diagram of the second antenna assembly provided in an embodiment of the present application when folded;

[0026] Fig.14 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with parasitic branches (second radiators) near the corner of the ground are arranged in the middle of the top edge of the foldable electronic device (folded state) in the free space scenario;

[0027] Fig.15 is a top view schematic diagram of a third antenna assembly provided in an embodiment of the present application when folded;

[0028] Fig.16 is a top view schematic diagram of a fourth antenna assembly provided in an embodiment of the present application when folded;

[0029] Fig.17 is a top view schematic diagram of the fifth antenna assembly provided in an embodiment of the present application when folded;

[0030] Fig.18 is a top view schematic diagram of a sixth antenna assembly provided in an embodiment of the present application when folded;

[0031] Fig.19 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with long parasitic branches located in the middle of the top edge of the foldable electronic device (folded state) in the right hand holding scenario;

[0032] Fig. 20 is a top view schematic diagram of a sixth antenna assembly provided in an embodiment of the present application when folded;

[0033] Fig.21 is a top view schematic diagram of a sixth antenna assembly provided in an embodiment of the present application when folded;

[0034] Fig. 22 The S curve and efficiency curve of the GPS-L1 antenna with the first parasitic branch and the GPS-L1 antenna with the second parasitic branch located at the middle of the top edge of the foldable electronic device (folded state) in free space;

[0035] Fig.23 The S-curve and efficiency curve of the GPS-L1 antenna with a first parasitic branch and the GPS-L1 antenna with a second parasitic branch located in the middle of the top edge of the foldable electronic device (folded state) in the right-hand holding scenario. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In general electronic devices, GPS antennas are often placed at the corners of electronic devices to ensure a better environment, higher efficiency, and a higher upper hemisphere share of the directional diagram. In foldable electronic devices, in the folded scenario, the left hand holding fingers will touch the GPS antenna, and the right hand holding the user's palm will touch the GPS antenna, that is, the user may completely hold the GPS antenna on the corner when looking at the map. Comparing the performance of GPS antennas in free scenarios and hand-held scenarios, it can be seen that in the hand-held scenario, the GPS antenna frequency deviation is serious, reaching more than 200MHz. In the hand-held scenario, the S parameters of the GPS antenna in the GPS-L1 frequency band (near 1.575GHz) are basically not resonant. Compared with the free scenario, the performance decreases by nearly 10dB. The main reasons for the decrease in efficiency include 1. The decrease in efficiency caused by folding. 2. The influence of energy absorption by the human body when holding the hand. 3. The influence of frequency deviation. How to improve the efficiency of the GPS frequency band in the folded handheld state and improve the antenna performance of the closed navigation have become technical problems that need to be solved.

[0040] 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.

[0041] 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.

[0042] See also Figure 3 The foldable electronic device 1000 provided in the embodiment of the present application includes at least a foldable body 10 and an antenna assembly 20.

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

[0044] 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.

[0045] The following is an example of the environment in which the antenna assembly 20 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 20 can be a part of the frame or embedded in the frame. Wherein, the first body 11 is arranged on the bottom plate of the first shell 41 (accommodated in the first shell), and the second body 13 is arranged on the bottom plate of the second shell 42 (accommodated 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 has 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] 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.

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

[0054] See also Figure 2 , the 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.

[0055] See also Figure 5The peripheral side of the first body 11 includes a top side 111, a first side 113, a first connecting side 112, and a second side 114 connected in sequence. The peripheral side of the second body 13 includes a bottom side 131, a third side 133, a second connecting side 132, and a fourth side 134 connected in sequence. When the foldable body 10 is in a folded state, the top side 111 and the bottom side 131 are respectively located on opposite sides of the electronic device 1000, and when the foldable body 10 is in a folded state, the top side 111 and the bottom side 131 overlap in the thickness direction.

[0056] 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.

[0057] In one embodiment, the first connection edge 112 and the second connection 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 top edge 111 and the bottom 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.

[0058] See also Figure 5 When flattened, the first side 113 is collinearly arranged with the third side 133, and the second side 114 is collinearly arranged with the fourth side 134. When folded, the first side 113 is aligned with the third side 133 and spaced apart. The second side 114 is aligned with the fourth side 134 and spaced apart, and the top side 111 is aligned with the bottom side 131 and spaced apart.

[0059] Optionally, when folded, the top edge 111 and the bottom edge 131 are disconnected, and the first connecting edge 112 and the second connecting edge 132 are short-circuited. The foldable body 10 forms a slit cavity structure with three sides being open, i.e., disconnected ends, and one side being a short-circuited end. After folding, the top edge 111 of the first body 11 and the bottom edge 131 of the second body 13 are separated by a small distance d, and the value of d is 0.5 mm-4 mm, but is not limited to this data.

[0060] In another embodiment, the connection between the first connection edge 112 and the second connection edge 132 is an insulating connection.

[0061] See also Figure 5 , the top edge 111 includes a first end 111a and a second end 111b that are oppositely disposed. The first end 111a is connected to the first side edge 113, and the second end 111b is connected to the second side edge 114. In other words, the first end 111a is also the connection position between the top edge 111 and the first side edge 113, and the second end 111b is also the connection position between the top edge 111 and the second side edge 114.

[0062] See also Figure 5 The antenna assembly 20 at least includes a first radiator 21 , a first signal source 23 and a second radiator 22 .

[0063] The first radiator 21 is disposed on the top side 111. Optionally, the first radiator 21 may be parallel to the top side 111. The orthographic projection of the first radiator 21 in the thickness direction does not overlap with the orthographic projection of the first body 11 in the thickness direction.

[0064] The material of the first radiator 21 is a conductive material, including but not limited to metal, alloy, conductive oxide, conductive polymer, graphene, etc. The form of the first 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 first radiator 21 takes the metal frame of the mobile phone as an example.

[0065] Optionally, the present application does not specifically limit the shape of the first radiator 21. For example, the shape of the first radiator 21 includes but is not limited to a strip, a sheet, a rod, a coating, a film, and the like. Figure 5 The first radiator 21 shown is only an example and does not limit the shape of the first radiator 21 provided in the present application. In the present embodiment, the first radiator 21 is in a strip shape. The present application does not limit the extension trajectory of the first radiator 21. In the present embodiment, the first radiator 21 is in a straight line shape. In other embodiments, the first radiator 21 may also extend in a bent, curved or other trajectory. The above-mentioned first radiator 21 may be a line with uniform width on the extension trajectory, or may be a strip with unequal width such as a gradient width and a widened area. In the present embodiment, the first radiator 21 is roughly in a strip shape.

[0066] See also Figure 5 , the first radiator 21 includes a first free end A, a first feeding point B and a first grounding terminal C which are arranged in sequence. The first free end A is an end where other conductive structures are physically disconnected. The present application does not specifically limit the position of the feeding point B on the first radiator 21. The first grounding terminal C is electrically connected to the reference ground. When the first body 11 is a conductive member and serves as part of the reference ground system, the first grounding terminal C is electrically connected to the first body 11, wherein the electrical connection method includes but is not limited to methods such as through conductive springs, physical connection (interconnected as one), welding, through coaxial lines, through microstrip lines, through conductive adhesives, etc.

[0067] See also Figure 5 , Figure 6a , Figure 6a The dotted box in the figure is the area covered by the foldable electronic device 1000 when the left hand holds the folded device. The distance between the first free end A and the first end 111a is less than the distance between the first free end A and the second end 111b. The distance L1 between the first free end A and the first end 111a is greater than or equal to the first preset avoidance distance La. The first preset avoidance distance La is used to avoid the thumb when holding the foldable body 10 in the folded state, so as to prevent the left thumb from covering the first radiator 21. For example, the first preset avoidance distance La is about 10 mm.

[0068] See also Figure 5 and Figure 6b , Figure 6b The dotted box in the figure is the area covered by the foldable electronic device 1000 when held in the right hand and folded. The distance L2 between the first ground terminal C and the second terminal 111b is greater than or equal to the first preset avoidance distance La, which is used to avoid the thumb when holding the foldable body 10 in the folded state, so as to avoid the right thumb from covering the second radiator 22. Through the above design, the frequency deviation of the foldable electronic device 1000 when held in the folded state can be effectively avoided, and the frequency band stability of the foldable electronic device 1000 when held in the folded state is improved, especially the stability of the GPS signal, so as to realize the closed navigation function.

[0069] The first signal source 23 is electrically connected to the first feeding point B, and is used to feed an excitation current to the first radiator 21 to excite the first radiator 21 to generate a resonant mode supporting the GPS frequency band. The GPS frequency band includes but is not limited to GPS-L1 and GPS-L5. This embodiment takes the GPS-L1 frequency band as an example.

[0070] 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 first radiator 21 to excite the first 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] See also Figure 5 , at least part of the second radiator 22 is disposed on the bottom edge 131. Optionally, the second radiator 22 may be parallel to the bottom edge 131. The orthographic projection of the second radiator 22 in the thickness direction does not overlap with the orthographic projection of the second body 13 in the thickness direction. The structure, shape, and material of the second radiator 22 refer to the structure, shape, and material of the first radiator 21.

[0075] See also Figure 5 , the second radiator 22 includes a second free end D and a second ground end E which are spaced apart. The second free end D is an end physically disconnected from other conductive structures. The second ground end E is grounded. When the second body 13 is a conductive member and is part of the reference ground system, the second ground end E is electrically connected to the second body 13, wherein the electrical connection method includes but is not limited to through a conductive spring, physical connection (interconnected as one), welding, through a coaxial line, through a microstrip line, through a conductive adhesive, and the like.

[0076] See also Figure 7 When the foldable body 10 is in the folded state, the direction in which the first ground end C points to the first free end A is opposite to the direction in which the second ground end E points to the second free end D. That is, the free end of the first radiator 21 points in the opposite direction to the free end of the second radiator 22.

[0077] 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 first 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 top 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 bottom 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 first radiator 21 and the free end of the second radiator 22 point in the same direction, opposite currents will be generated between the first radiator 21 and the second radiator 22. The reverse currents on the first radiator 21 and the second radiator 22 will not only lead to the mutual cancellation of far-field energy, thereby reducing the efficiency of the frequency band supported by the first radiator 21, but also make it impossible to form a resonant mode that improves efficiency.

[0078] In this embodiment, the free end of the first radiator 21 is designed to point in the opposite direction to the free end of the second radiator 22. This is in accordance with the current distribution on the first radiator 21 and the second radiator 22 under the capacitor structure formed by the first body 11 and the second body 13, and avoids the formation of reverse current on the first radiator 21 and the second radiator 22, which is conducive to the coupling of the first radiator 21 and the second radiator 22 and the formation of a resonance mode together.

[0079] See also Figure 8 In the thickness direction of the foldable body 10, the first radiator 21 is opposite to and coupled with at least part of the second radiator 22. The first radiator 21 conducts the excitation current of the first signal source 23 to the second radiator 22 to excite the second radiator 22 to generate a resonant current.

[0080] See also Figure 8, when the first body 11 and the second body 13 are in a folded state, the first body 11 and the second body 13 are arranged to overlap in the thickness direction. The orthographic projection of the first radiator 21 in the thickness direction of the foldable body 10 at least partially overlaps with the area where the second radiator 22 is located. The first radiator 21 and the second radiator 22 are spaced apart and coupled with each other. This application does not make a specific limitation on this spacing. When the signal source 24 excites the first radiator 21 to generate current, a capacitor structure is formed between the second radiator 22 and the first radiator 21, so that the second radiator 22 can resonate under the excitation of the signal source 24.

[0081] When the foldable body 10 is in the unfolded state, the signal source 24 excites the first radiator 21 and the second radiator 22 to form a resonance mode together. At this time, the second radiator 22 cannot be coupled with the first radiator 21, and thus cannot form a resonance mode together with the first radiator 21. When the foldable body 10 is in the folded state, since the second radiator 22 and the second radiator 22 are both close to the first radiator 21, the second radiator 22 and the first radiator 21 have the conditions to form a coupling capacitor structure. Therefore, when the foldable body 10 is in the folded state, one or both of the second radiator 22 and the second radiator 22 are coupled with the first radiator 21 to form a resonance mode together, so as to improve the frequency band supported by the first radiator 21.

[0082] By arranging the first radiator 21 in the middle of the top edge 111 of the foldable electronic device 1000, and reserving a preset avoidance distance between both ends of the first radiator 21 and the corner position of the top edge 111, the first radiator 21 is prevented from being blocked by the hand when the hand is held in the folded state, thereby avoiding the frequency deviation problem caused by the hand holding, so that the foldable electronic device 1000 supports the closed-cover navigation function. In the folded state, the first radiator 21 can be coupled with the second radiator 22 arranged in the opposite direction, and then the first radiator 21 conducts the excitation current of the signal source to the second radiator 22, so that the second radiator 22 generates a resonant current, so as to improve the efficiency of the GPS frequency band and improve the antenna performance of the closed-cover navigation.

[0083] The antenna assembly 20 provided in the present application, by arranging the GPS antenna in the middle of the top edge 111, ensures that in a folded scenario, the fingers will not hold the main branch of the GPS antenna (the first radiator 21). In the left-handed holding scenario, the fingers cannot reach the upper side. In the right-handed holding scenario, there will be a gap between the base of the right hand and the GPS antenna, ensuring that the GPS antenna cannot be completely gripped.

[0084] See also Fig. 9 , Fig. 9It is a structural schematic diagram of a GPS-L1 antenna without parasitic branches and arranged in the middle of the top edge 111 of the foldable electronic device 1000 (folded state).

[0085] See also Fig.10 , Fig.10 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and arranged in the middle of the top edge 111 of the foldable electronic device 1000 (folded state) in free space and in the right-hand holding scenario. Among them, curve a1 is the S curve in free space, curve a2 is the S curve in the right-hand holding scenario, curve b1 is the radiation efficiency curve in free space, curve b2 is the radiation efficiency curve in the right-hand holding scenario, curve c1 is the total efficiency curve in free space, and curve c2 is the total efficiency curve in the right-hand holding scenario.

[0086] It can be seen from curves a1 and a2 that the GPS-L1 antenna disposed in the middle of the top edge 111 of the foldable electronic device 1000 has almost no frequency deviation in free space and in the right-hand holding scenario. It can be seen from the efficiency curve that the GPS-L1 antenna disposed in the middle of the top edge 111 of the foldable electronic device 1000 has good efficiency in the right-hand holding scenario.

[0087] See also Fig.11 , Fig.11 yes Figure 7 Provided are S curves and efficiency curves of a GPS-L1 antenna with parasitic branches and a GPS-L1 antenna without parasitic branches and arranged in the middle of the top edge 111 of a foldable electronic device 1000 (folded state). Curve a1 is the S curve of the GPS-L1 antenna without parasitic branches, curve a2 is the S curve of the GPS-L1 antenna with parasitic branches, curve b1 is the radiation efficiency curve of the GPS-L1 antenna without parasitic branches, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with parasitic branches, curve c1 is the total efficiency curve of the GPS-L1 antenna without parasitic branches, and curve c2 is the total efficiency curve of the GPS-L1 antenna with parasitic branches.

[0088] from Fig.10 and Fig.11 It can be seen from the efficiency curve that by adding parasitic branches, the overall radiation efficiency of the GPS-L1 antenna provided in the embodiment of the present application in the right-hand holding scenario is improved, and the efficiency bandwidth is also improved.

[0089] See also Fig.12 , Fig.12The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with parasitic branches (second radiator 22) are arranged in the middle of the top edge 111 of the foldable electronic device 1000 (folded state) in the right hand holding scenario. Among them, curve a1 is the S curve of the GPS-L1 antenna without parasitic branches, curve a2 is the S curve of the GPS-L1 antenna with parasitic branches (second radiator 22), curve b1 is the radiation efficiency curve of the GPS-L1 antenna without parasitic branches, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with parasitic branches (second radiator 22), curve c1 is the total efficiency curve of the GPS-L1 antenna without parasitic branches, and curve c2 is the total efficiency curve of the GPS-L1 antenna with parasitic branches (second radiator 22).

[0090] From the efficiency curve in the figure, it can be seen that after adding parasitic branches, the efficiency of the GPS band in the handheld scenario is significantly improved, and the peak efficiency is increased by nearly 3dB.

[0091] The present application does not specifically limit the relative lengths of the first radiator 21 and the second radiator 22 .

[0092] See also Figure 8 In the folded state, the orthographic projection of the second free end D in the thickness direction of the foldable body 10 is located on the first radiator 21, so that the first radiator 21 and the second radiator 22 are opposite and coupled.

[0093] Optionally, a relative length between the first radiator 21 and the second radiator 22 is greater than or equal to 1 / 2 of a total length of the first radiator 21 .

[0094] If the relative length between the first radiator 21 and the second radiator 22 is small, the coupling area between the first radiator 21 and the second radiator 22 may be relatively small, especially when the first radiator 21 and the second radiator 22 are not in common ground, the coupling effect between the first radiator 21 and the second radiator 22 is insufficient to enable the second radiator 22 to generate a resonant current under the excitation of the signal source. The present application designs the relative length between the first radiator 21 and the second radiator 22 to be greater than or equal to 1 / 2 of the total length of the first radiator 21, so that there is a sufficiently large coupling effect between the first radiator 21 and the second radiator 22, and the signal source can fully excite the first radiator 21 and the second radiator 22.

[0095] The distance between the first free end A and the first end 111a is smaller than the distance between the first ground end C and the second end 111b. In other words, the first free end A is closer to the first end 111a than the first ground end C. The first ground end C is closer to the midpoint of the top edge 111 than the first free end A, so that the first radiator 21 forms more longitudinal (Y-axis direction) mode current on the reference floor when generating the resonant current, so as to improve the radiation efficiency of the GPS frequency band.

[0096] In the present application, the distance between the first ground terminal C and the midpoint of the top edge 111 is less than or equal to the first preset distance. The present application does not limit the first preset distance, and optionally, the first preset distance is less than or equal to 10 mm. For example, the first preset distance is 5 mm, 4 mm, 3 mm, 2 mm, 1 mm, 0 mm, etc.

[0097] The first ground terminal C is close to the midpoint of the top edge 111. When generating a resonant current, the first radiator 21 forms less transverse (X-axis direction) mode current and more longitudinal mode current on the reference floor. The longitudinal mode current can further improve the radiation efficiency of the GPS frequency band.

[0098] See also Figure 8 , the bottom edge 131 includes a third end 131a and a fourth end 131b that are arranged opposite to each other. When the foldable electronic device 1000 is in a folded state, the third end 131a and the first end 111a are arranged opposite to each other in the thickness direction, and the fourth end 131b and the second end 111b are arranged opposite to each other in the thickness direction. The distance between the second grounding end E and the third end 131a is smaller than the distance between the second grounding end E and the fourth end 131b. In other words, the second grounding end E is closer to the position of the third end 131a. The distance between the second grounding end E and the third end 131a is greater than or equal to the second preset avoidance distance. The second preset avoidance distance is used to avoid the thumb when holding the foldable body 10 in the folded state, so as to avoid the left thumb covering the second grounding end E of the second radiator 22 when the left hand is holding it. Since the second grounding end E is a high current position back to the ground, if this position is covered by a finger, a large frequency deviation will occur in the frequency band supported by the antenna assembly 20. Through the above design in this embodiment, frequency deviation can be effectively avoided when the foldable electronic device 1000 is held in a folded state, and the frequency band stability of the foldable electronic device 1000 when held in a folded state is improved, especially the stability of the GPS signal, thereby realizing the closed-cover navigation function.

[0099] The second preset avoidance distance is greater than or equal to the partial overlap size of the thumb. The present application does not limit the specific value of the second preset avoidance distance. For example, the second preset avoidance distance is about 10 mm.

[0100] Optionally, the second ground terminal E is located at the top edge 111. By setting the second ground terminal E at the top edge 111, the second radiator 22 avoids being held by the left hand when the foldable electronic device 1000 is folded. In addition, when the second ground terminal E is located at the top edge 111, the resonant current on the second radiator 22 forms a longitudinal mode floor current on the reference floor. Compared with the resonant current on the second radiator 22 forming a transverse mode floor current on the reference floor when the second ground terminal E is set at the first side edge 113, the modes of the floor currents of the first radiator 21 and the second radiator 22 on the reference floor are avoided to be orthogonal. The first radiator 21 and the second radiator 22 both form longitudinal mode floor currents on the reference floor, which is beneficial to the resonant current on the second radiator 22 and the resonant current of the second radiator 22 to improve the efficiency of GPS. The reference floor can be the foldable body 10.

[0101] In other embodiments, the second ground end E may also be disposed on the first side 113. In this embodiment, the second free end D is located on the top edge 111. In this case, the length of the second radiator 22 may be greater than that of the first radiator 21, and the second radiator 22 may also serve as a low-frequency antenna.

[0102] Optional, see Fig.13 , the bottom edge 131 includes a third end 131a and a fourth end 131b that are arranged opposite to each other. The distance between the second grounding end E and the third end 131a is less than the distance between the second grounding end E and the fourth end 131b. The distance between the second grounding end E and the third end 131a is less than or equal to 1 / 16 wavelength of the GPS frequency band. In other words, the second grounding end E is close to the connection point between the two intersecting adjacent edges of the reference floor, that is, the large current return position of the second radiator 22 is located at the connection point (corner point) between the two intersecting adjacent edges of the reference floor, so as to reduce the floor current formed by the second radiator 22 on the reference floor to form a reverse current along the edge of the reference floor. The floor current on the reference floor has a greater contribution to the radiation of GPS. The more reverse current on the reference floor, the more far-field energy cancels each other, and the contribution of the floor current on the reference floor to the radiation of GPS is reduced. This embodiment reduces the floor current formed by the second radiator 22 on the reference floor to form a reverse current along the edge of the reference floor, which can increase the contribution of the floor current on the reference floor to the radiation of the GPS, improve the efficiency of the second radiator 22 and improve the in-band efficiency of the first radiator 21.

[0103] See also Fig.14 , Fig.14The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with parasitic branches (second radiator 22) back to the ground near the corner are arranged in the middle of the top edge 111 of the foldable electronic device 1000 (folded state) in the free space scene. Among them, curve a2 is the S curve of the GPS-L1 antenna without parasitic branches, curve a1 is the S curve of the GPS-L1 antenna with parasitic branches (second radiator 22) back to the ground near the corner, curve b2 is the radiation efficiency curve of the GPS-L1 antenna without parasitic branches, curve b1 is the radiation efficiency curve of the GPS-L1 antenna with parasitic branches (second radiator 22) back to the ground near the corner, curve c2 is the total efficiency curve of the GPS-L1 antenna without parasitic branches, and curve c1 is the total efficiency curve of the GPS-L1 antenna with parasitic branches (second radiator 22) back to the ground near the corner.

[0104] from Fig.14 It can be seen that the GPS-L1 antenna with the parasitic branch (the second radiator 22) close to the corner has a certain improvement in overall efficiency compared with the antenna without the parasitic branch.

[0105] The first signal source 23 is also used to stimulate the first radiator 21 to support at least one of the N78 frequency band, the Wi-Fi 2.4G frequency band, and the Wi-Fi 5G frequency band. In other words, the antenna assembly 20 can simultaneously cover the GPS+N78 frequency band, the GPS+Wi-Fi 2.4G frequency band, the GPS+Wi-Fi 5G frequency band, etc.

[0106] The electrical length and physical length of the first radiator 21 and the second radiator 22 are exemplified below with reference to the accompanying drawings.

[0107] In a first embodiment, the electrical length of the second radiator 22 is less than or equal to the electrical length of the first radiator 21 .

[0108] The electrical length described in this application can satisfy the following formula:

[0109]

[0110] Where L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in free space.

[0111] The first radiator 21 and the second radiator 22 generate a first resonance mode and a second resonance mode under a signal source. Among them, the resonance current of the first resonance mode includes a first current distributed on the first radiator 21 and a second current distributed on the second radiator 22. Among them, the first current and the second current are currents in the same direction. The first current is a 1 / 4 wavelength mode of the first resonance frequency, and the electrical length of the first radiator 21 is close to 1 / 4 wavelength of the first resonance frequency. The intensity of the first current is greater than the intensity of the second current, and the first current determines the resonance frequency of the first resonance mode, that is, the first resonance frequency is the resonance frequency of the first resonance mode, and the first resonance frequency is also the center frequency of the GPS frequency band.

[0112] The resonant current of the second resonant mode includes a third current distributed on the first radiator 21 and a fourth current distributed on the second radiator 22. The third current and the fourth current are currents in the same direction. The third current and the first current are currents in the same direction. The fourth current is a 1 / 4 wavelength mode of the second resonant frequency, and the electrical length of the second radiator 22 is close to 1 / 4 wavelength of the second resonant frequency. The intensity of the fourth current is greater than the intensity of the third current, and the fourth current determines the resonant frequency of the second resonant mode, that is, the second resonant frequency is the resonant frequency of the second resonant mode. The second resonant frequency is greater than the first resonant frequency.

[0113] Further, the electrical length of the second radiator 22 is slightly smaller than the electrical length of the first radiator 21. The resonant frequency of the second radiator 22 is greater than or equal to the resonant frequency of the first radiator 21. Further, the second resonant frequency is slightly higher than the first resonant frequency. The first resonant mode is integrated with the second resonant mode, and the second resonant mode can improve the efficiency of the first resonant mode to increase the in-band efficiency and in-band bandwidth of GPS.

[0114] In a first alternative implementation, see Fig.15 , the physical length of the second radiator 22 is less than or equal to the physical length of the first radiator 21. Generally, the physical length of the first radiator 21 is positively correlated with the electrical length of the first radiator 21.

[0115] For details, please refer to Fig.15, the antenna assembly 20 also includes a third radiator 30 and a second signal source (blocked). The third radiator 30 is arranged on the bottom edge 131. The third radiator 30 is coupled with the second radiator 22 (for example, forming a mouth-to-mouth antenna). The second signal source is electrically connected to the third radiator 30. The second signal source is used to excite the third radiator 30 and the second radiator 22 to support at least one of the LB band, the MHB band, and the UHB band. In other words, the second radiator 22 can not only serve as a parasitic radiator of the first radiator 21 when the foldable electronic device 1000 is in a folded state, but also serve as a parasitic radiator of the third radiator 30. In this way, the second radiator 22 can not only improve the efficiency of the GPS band, but also can be used to support at least one of the MHB band and the UHB band to support more frequency bands.

[0116] In this embodiment, the physical lengths of the first radiator 21 and the second radiator 22 can be close, and both are arranged on the top edge 111, which can avoid the folded hand-held area and improve the folded hand-held performance; at the same time, the resonant current (or resonant mode) formed by the second radiator 22 can improve the GPS frequency band supported by the first radiator 21.

[0117] In a second alternative implementation, see Fig.16 and Fig.17 , the physical length of the second radiator 22 is greater than the physical length of the first radiator 21.

[0118] Optional, see Fig.16 , the antenna assembly 20 further includes a first inductive element 25. One end of the first inductive element 25 is electrically connected to the first feeding point B or the first grounding terminal C, and the other end of the first inductive element 25 is grounded. The first inductive element 25 is used to increase the electrical length of the first radiator 21 to meet the requirement that the physical length of the second radiator 22 is greater than the physical length of the first radiator 21, and the electrical length of the second radiator 22 is slightly smaller than the electrical length of the first radiator 21. The electrical length of the first radiator 21 includes the electrical length of the first radiator 21 itself and the electrical length increment brought by the first inductive element 25.

[0119] The present application does not specifically describe the specific components included in the first inductive element 25. Optionally, the first inductive element 25 includes but is not limited to components such as inductors and capacitors. For example, the first inductive element 25 is a large inductor, such as 10 nH, but is not limited to this data.

[0120] Optional, see Fig.17, the antenna assembly 20 further includes a capacitive element 26. One end of the capacitive element 26 is electrically connected to the second grounding end E, and the other end of the capacitive element 26 is grounded. The capacitive element 26 is used to reduce the electrical length of the second radiator 22, so that the physical length of the second radiator 22 is greater than the physical length of the first radiator 21, and the electrical length of the second radiator 22 is slightly smaller than the electrical length of the first radiator 21. The electrical length of the second radiator 22 includes the electrical length of the second radiator 22 itself and the electrical length reduction brought by the capacitive element 26.

[0121] The present application does not provide a detailed description of the specific components included in the capacitive element 26. Optionally, the capacitive element 26 includes but is not limited to components such as an inductor and a capacitor. For example, the capacitive element 26 is a large capacitor.

[0122] Optionally, the antenna assembly 20 may include both the first inductive element 25 and the capacitive element 26 mentioned above.

[0123] In this embodiment, the physical length of the second radiator 22 is greater than the physical length of the first radiator 21. The first radiator 21 can also serve as a low-frequency antenna. The folding hand-held performance is improved by keeping the second ground end E of the second radiator 22 away from the folding hand-holding area. At the same time, adding the function of the second radiator 22 can not only improve the efficiency of the first radiator 21 in supporting the GPS frequency band, but also support the LB frequency band, thereby realizing closed-cover navigation and closed-cover low-frequency calls.

[0124] In the second embodiment, the electrical length of the second radiator 22 is greater than the electrical length of the first radiator 21 .

[0125] Generally, the first free end A of the first radiator 21 and the reference floor can be equivalent to a large capacitor, and this area is relatively sensitive to hand holding. In this embodiment, since the second radiator 22 is coupled to the first radiator 21, the second radiator 22 plays a pulling role on the resonant current on the first radiator 21, so that the current on the first radiator 21 is pulled to the second radiator 22, so as to reduce the sensitivity of the first free end A of the first radiator 21 to hand holding. In this way, in the folded handheld state, the electrical length of the second radiator 22 is greater than the electrical length of the first radiator 21, and the resonant frequency of the second resonant mode is less than the resonant frequency of the first resonant mode, which can also improve the efficiency of the first radiator 21 in supporting the GPS frequency band and improve the closed navigation performance.

[0126] Optional, see Fig.18, the second radiator 22 also includes a second feeding point F located between the second free end D and the second ground end E. The antenna assembly 20 also includes a third signal source 27. The third signal source 27 is electrically connected to the second feeding point F. The third signal source 27 is used to excite the second radiator 22 to support the LB frequency band. That is, the second radiator 22 not only serves as a parasitic branch to improve the efficiency of the GPS frequency band, but also can serve as a main branch to support the LB frequency band.

[0127] In a first optional implementation manner, the physical length of the second radiator 22 is greater than the physical length of the first radiator 21. The second radiator 22 may be referred to as a long parasitic stub.

[0128] See also Fig.19 , Fig.19 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with long parasitic branches (second radiator 22) are arranged in the middle of the top edge 111 of the foldable electronic device 1000 (folded state) in the right hand holding scenario. Among them, curve a1 is the S curve of the GPS-L1 antenna without parasitic branches, curve a2 is the S curve of the GPS-L1 antenna with long parasitic branches (second radiator 22), curve b1 is the radiation efficiency curve of the GPS-L1 antenna without parasitic branches, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with long parasitic branches (second radiator 22), curve c1 is the total efficiency curve of the GPS-L1 antenna without parasitic branches, and curve c2 is the total efficiency curve of the GPS-L1 antenna with long parasitic branches (second radiator 22).

[0129] It can be seen that after adding long parasitic branches, the efficiency in the GPS frequency band is significantly improved in the handheld scenario.

[0130] In a second optional implementation manner, the physical length of the second radiator 22 is less than or equal to the physical length of the first radiator 21 .

[0131] See also Fig. 20 , the antenna assembly 20 further includes a second inductive element 28. One end of the second inductive element 28 is electrically connected to the second feeding point F or the second grounding end E, and the other end of the second inductive element 28 is grounded. The second inductive element 28 is used to increase the electrical length of the second radiator 22, so that the physical length of the second radiator 22 is less than or equal to the physical length of the first radiator 21, and the electrical length of the second radiator 22 is greater than the electrical length of the first radiator 21. The electrical length of the second radiator 22 includes the electrical length of the second radiator 22 itself and the electrical length increment brought by the second inductive element 28.

[0132] The present application does not specifically describe the specific components included in the second inductive element 28. Optionally, the second inductive element 28 includes but is not limited to components such as inductors and capacitors. For example, the second inductive element 28 is a large inductor, such as 10 nH, but is not limited to this data.

[0133] The distance between the second ground terminal E and the third terminal 131a is smaller than the distance between the second ground terminal E and the fourth terminal 131b. That is, the second ground terminal E is located close to the third terminal 131a. The distance between the second ground terminal E and the third terminal 131a is less than or equal to 1 / 16 wavelength of the GPS frequency band. In other words, the second ground terminal E is close to the connection point between the two intersecting adjacent edges of the reference floor, that is, the large current return position of the second radiator 22 is located at the connection point (corner point) between the two intersecting adjacent edges of the reference floor, so as to reduce the floor current formed by the second radiator 22 on the reference floor to form a reverse current along the edge of the reference floor. The floor current on the reference floor has a greater contribution to the radiation of GPS. The more reverse current on the reference floor, the more far-field energy cancels each other, and the contribution of the floor current on the reference floor to the radiation of GPS is reduced. This embodiment reduces the floor current formed by the second radiator 22 on the reference floor to form a reverse current along the edge of the reference floor, which can increase the contribution of the floor current on the reference floor to the radiation of the GPS, improve the efficiency of the second radiator 22 and improve the in-band efficiency of the first radiator 21.

[0134] See also Fig.21 , the antenna assembly 20 further includes an adjustment circuit 29. The adjustment circuit 29 is electrically connected to the second ground terminal E. The adjustment circuit 29 is used to adjust the electrical length of the second radiator 22, so that the electrical length of the second radiator 22 is greater than the electrical length of the first radiator 21 when in the unfolded state, and the electrical length of the second radiator 22 is less than the electrical length of the first radiator 21 when in the folded state. For example, the adjustment circuit 29 includes a switch unit K1 and a capacitor device Cn. One end of the switch unit K1 is electrically connected to the second ground terminal E, and the other end of the switch unit K1 can be selectively directly grounded or grounded through the capacitor device Cn. In the unfolded state, the switch unit K1 switches to direct grounding, the electrical length of the second radiator 22 is greater than the electrical length of the first radiator 21, and the second radiator 22 supports the LB frequency band. In the folded state, the switch unit K1 switches to grounding through the capacitor device Cn, the electrical length of the second radiator 22 is less than the electrical length of the first radiator 21, and the efficiency of the first radiator 21 supporting the GPS frequency band is improved.

[0135] The second radiator 22 having an electrical length greater than that of the first radiator 21 is referred to as a first parasitic stub, and the second radiator 22 having an electrical length less than that of the first radiator 21 is referred to as a second parasitic stub.

[0136] See also Fig. 22 , Fig. 22 The S curve and efficiency curve of the GPS-L1 antenna with the first parasitic branch and the GPS-L1 antenna with the second parasitic branch are arranged in the middle of the top edge 111 of the foldable electronic device 1000 (folded state) in free space. Among them, curve a1 is the S curve of the GPS-L1 antenna with the first parasitic branch, curve a2 is the S curve of the GPS-L1 antenna with the second parasitic branch, curve b1 is the radiation efficiency curve of the GPS-L1 antenna with the first parasitic branch, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with the second parasitic branch, curve c1 is the total efficiency curve of the GPS-L1 antenna with the first parasitic branch, and curve c2 is the total efficiency curve of the GPS-L1 antenna with the second parasitic branch.

[0137] See also Fig.23 , Fig.23 The S curve and efficiency curve of the GPS-L1 antenna with a first parasitic branch and the GPS-L1 antenna with a second parasitic branch are arranged in the middle of the top edge 111 of the foldable electronic device 1000 (folded state) in the right hand holding scenario. Among them, curve a1 is the S curve of the GPS-L1 antenna with a first parasitic branch, curve a2 is the S curve of the GPS-L1 antenna with a second parasitic branch, curve b1 is the radiation efficiency curve of the GPS-L1 antenna with a first parasitic branch, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with a second parasitic branch, curve c1 is the total efficiency curve of the GPS-L1 antenna with a first parasitic branch, and curve c2 is the total efficiency curve of the GPS-L1 antenna with a second parasitic branch.

[0138] from Fig. 22 and Fig.23 It can be seen that in the hand-held scenario, the peak efficiency of the antenna component 20 with the second parasitic branch is slightly higher than the peak efficiency of the antenna component 20 with the first parasitic branch; in free space, the overall efficiency and bandwidth of the antenna component 20 with the first parasitic branch are higher than the overall efficiency and bandwidth of the antenna component 20 with the second parasitic branch.

[0139] In the antenna assembly 20 provided in the present application, the resonant frequency of the second radiator 22 can improve the performance of the GPS antenna in the hand-held scenario by being on the low-frequency side or the high-frequency side of the resonant frequency of the first radiator 21. In the hand-held scenario, the efficiency of the GPS antenna in the middle of the top edge 111 can be improved by 3-4dB compared to the corner position. After adding appropriate parasitic branches, the efficiency of the GPS antenna can be further improved by 3-4dB. The overall performance is improved by 6-8dB compared to the GPS in the corner, and the performance is significantly improved.

[0140] 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 electronic device comprises a foldable body and an antenna assembly, wherein 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 top edge, the top edge comprises a first end and a second end arranged opposite to each other, the second body comprises a bottom edge, when the foldable body is in the unfolded state, the top edge and the bottom edge are respectively located on opposite sides of the electronic device, and when the foldable body is in the folded state, the top edge and the bottom edge overlap in the thickness direction; Antenna assembly, comprising: A first radiator is arranged at the top edge, the first radiator comprises a first free end, a first feeding point and a first grounding end arranged in sequence; the distance between the first free end and the first end is smaller than the distance between the first free end and the second end, the distance between the first free end and the first end is greater than or equal to a first preset avoidance distance, the distance between the first grounding end and the second end is greater than or equal to the first preset avoidance distance; the first grounding end is grounded; a first signal source, the first signal source being electrically connected to the first feeding point and used for feeding an excitation current to the first radiator to excite the first radiator to generate a resonant mode supporting a GPS frequency band; A second radiator, at least a portion of the second radiator is disposed on the bottom edge, the second radiator comprises a second free end and a second grounding end which are spaced apart, and the second grounding end is grounded; When the foldable body is in a folded state, the direction in which the first ground end points to the first free end is opposite to the direction in which the second ground end points to the second free end, and in the thickness direction of the foldable body, at least parts of the first radiator and the second radiator are opposite and coupled.

2. The foldable electronic device according to claim 1, characterized in that: When the foldable body is in a folded state, the orthographic projection of the second free end in a thickness direction of the foldable body is located on the first radiator.

3. The foldable electronic device according to claim 2, characterized in that: The relative length between the first radiator and the second radiator is greater than or equal to 1 / 2 of the total length of the first radiator.

4. The foldable electronic device according to claim 1, wherein: A distance between the first free end and the first end is smaller than a distance between the first ground end and the second end.

5. The foldable electronic device according to claim 4, characterized in that: The distance between the first grounding end and the midpoint of the top edge is less than or equal to a first preset distance.

6. The foldable electronic device according to claim 1, wherein: The bottom edge includes a third end and a fourth end that are arranged opposite to each other. When the foldable electronic device is in a folded state, the third end and the first end are arranged opposite to each other in the thickness direction, the fourth end and the second end are arranged opposite to each other in the thickness direction, and the distance between the second grounding end and the third end is smaller than the distance between the second grounding end and the fourth end.

7. The foldable electronic device according to claim 6, characterized in that: The distance between the second grounding end and the third end is greater than or equal to a second preset avoidance distance; or, The distance between the second ground end and the third end is less than or equal to 1 / 16 wavelength of the GPS frequency band.

8. The foldable electronic device according to claim 1, wherein: The second grounding terminal is located at the top side.

9. The foldable electronic device according to any one of claims 1 to 8, characterized in that: The electrical length of the second radiator is less than or equal to the electrical length of the first radiator, and the resonant frequency of the second radiator is greater than or equal to the resonant frequency of the first radiator.

10. The foldable electronic device according to claim 9, characterized in that: The physical length of the second radiator is less than or equal to the physical length of the first radiator.

11. The foldable electronic device according to claim 10, characterized in that: The antenna assembly also includes a third radiator and a second signal source. The third radiator is arranged on the bottom edge, the third radiator is coupled with the second radiator, the second signal source is electrically connected to the third radiator, and the second signal source is used to excite the third radiator and the second radiator to support at least one of the LB frequency band, the MHB frequency band, and the UHB frequency band.

12. The foldable electronic device according to claim 9, wherein: The physical length of the second radiator is greater than the physical length of the first radiator.

13. The foldable electronic device according to claim 12, characterized in that: The antenna assembly also includes a first inductive element, one end of which is electrically connected to the first feeding point or the first grounding end, and the other end of the first inductive element is grounded, and the first inductive element is used to increase the electrical length of the first radiator.

14. The foldable electronic device according to claim 12, wherein: The antenna assembly further includes a capacitive element, one end of the capacitive element is electrically connected to the second ground end, the other end of the capacitive element is grounded, and the capacitive element is used to reduce the electrical length of the second radiator.

15. The foldable electronic device according to any one of claims 1 to 8, characterized in that: The electrical length of the second radiator is greater than the electrical length of the first radiator.

16. The foldable electronic device according to claim 15, characterized in that: The second radiator also includes a second feeding point located between the second free end and the second ground end, and the antenna assembly also includes a third signal source, which is electrically connected to the second feeding point and is used to excite the second radiator to support the LB frequency band.

17. The foldable electronic device according to claim 16, wherein: The physical length of the second radiator is greater than the physical length of the first radiator; or, The physical length of the second radiator is less than or equal to the physical length of the first radiator, the antenna assembly also includes a second inductive element, one end of the second inductive element is electrically connected to the second feeding point or the second grounding end, the other end of the second inductive element is grounded, and the second inductive element is used to increase the electrical length of the second radiator; the bottom edge includes a third end and a fourth end arranged opposite to each other, the distance between the second grounding end and the third end is less than the distance between the second grounding end and the fourth end, and the distance between the second grounding end and the third end is less than or equal to 1 / 16 wavelength of the GPS frequency band.

18. The foldable electronic device according to any one of claims 1 to 8, characterized in that: The antenna assembly also includes an adjustment circuit, which is electrically connected to the second ground terminal and is used to adjust the electrical length of the second radiator. The electrical length of the second radiator is greater than the electrical length of the first radiator when in an unfolded state, and the electrical length of the second radiator is less than the electrical length of the first radiator when in a folded state.

19. The foldable electronic device according to any one of claims 1 to 8, characterized in that: The first signal source is also used to stimulate the first radiator to support at least one of the N78 frequency band, the Wi-Fi 2.4G frequency band, and the Wi-Fi 5G frequency band.

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