Foldable electronic device

Abstract

The application provides a foldable electronic device, a first radiator is arranged on a top edge, the first radiator 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 greater than or equal to a first preset avoidance distance, a first signal source excites the first radiator to generate a resonance mode supporting a GPS frequency band, at least part of a second radiator is arranged on a bottom edge, the second radiator comprises a second free end and a second grounding end, when the foldable main body is in a folded state, the direction in which the first grounding end points to the first free end is opposite to the direction in which the second grounding end points to the second free end, and in the thickness direction of the foldable main body, at least part of the first radiator and the second radiator are opposite and coupled. The application provides a foldable electronic device capable of improving the efficiency of the GPS frequency band and improving the antenna performance of the navigation cover.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a foldable electronic device. BACKGROUND

[0002] Foldable electronic devices with unfolded and folded states are attracting more and more attention because they have a large display screen when unfolded, occupy less space when folded, and are easy to carry. Foldable electronic devices also have a folded handheld state. How to improve the efficiency of the GPS frequency band and improve the antenna performance of the combined cover navigation has become a technical problem to be solved. SUMMARY

[0003] The present application provides a foldable electronic device capable of improving the efficiency of the GPS frequency band and improving the antenna performance of the combined cover navigation.

[0004] The foldable electronic device provided by the present application comprises a foldable main body and an antenna assembly. The foldable main body comprises a first main body and a second main body. The first main body and the second main body are movably connected to present an unfolded state or a folded state. The first main body comprises a top edge comprising a first end and a second end arranged opposite to each other. The second main body comprises a bottom edge. When the foldable main body is in the unfolded state, the top edge and the bottom edge are respectively located on opposite sides of the electronic device. When the foldable main body is in the folded state, the top edge and the bottom edge overlap in the thickness direction.

[0005] The antenna assembly comprises:

[0006] A first radiator is arranged on 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 less 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 is electrically connected to the first feeding point. The first signal source is used to feed an excitation current to the first radiator to excite the first radiator to generate a resonance mode supporting the GPS frequency band.

[0008] A second radiator is arranged on the bottom edge. The second radiator comprises a second free end and a second grounding end arranged at intervals. The second grounding end is grounded.

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

[0010] The foldable electronic device provided by the application avoids the first radiator being shielded by the hand when the hand holds the foldable electronic device in the folded state, and thus avoids the frequency deviation problem caused by the hand holding, so that the foldable electronic device supports the cover-closed navigation function; in the folded state, the first radiator can be coupled with the reversely arranged second radiator, and thus the first radiator conducts the excitation current of the signal source to the second radiator, so that the second radiator generates the resonant current, thereby improving the efficiency of the GPS frequency band and the antenna performance of the cover-closed navigation. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced.

[0012] Figure 1 is a structural schematic diagram of a foldable electronic device provided by the embodiments of the application;

[0013] Figure 2 is an exploded structural schematic diagram of a foldable electronic device provided by the embodiments of the application;

[0014] Figure 3 is a structural schematic diagram of a sliding folding of a foldable electronic device provided by the embodiments of the application;

[0015] Figure 4 is a structural schematic diagram of a rotating folding of a foldable electronic device provided by the embodiments of the application;

[0016] Figure 5 is a position layout schematic diagram of a first antenna assembly provided by the embodiments of the application when unfolded;

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

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

[0019] Figure 7 is a three-dimensional schematic diagram of a first antenna assembly provided by the embodiments of the application when folded;

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

[0021] Figure 9 is a three-dimensional schematic diagram of an antenna assembly provided by an embodiment of the present application without a parasitic branch;

[0022] Figure 10 is an S curve and an efficiency curve of a GPS-L1 antenna without a parasitic branch and arranged in a middle portion of a top edge of a foldable electronic device (in a folded state) in a free space and in a right-hand holding scenario;

[0023] Figure 11 is Figure 7 is an S curve and an efficiency curve of a GPS-L1 antenna provided by an embodiment of the present application and arranged in a middle portion of a top edge of a foldable electronic device (in a folded state) in a free space and in a right-hand holding scenario;

[0024] Figure 12 is an S curve and an efficiency curve of a GPS-L1 antenna without a parasitic branch and a GPS-L1 antenna with a parasitic branch arranged in a middle portion of a top edge of a foldable electronic device (in a folded state) in a right-hand holding scenario;

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

[0026] Figure 14 is an S curve and an efficiency curve of a GPS-L1 antenna without a parasitic branch and a GPS-L1 antenna with a parasitic branch (a second radiator) arranged close to a corner of a ground in a middle portion of a top edge of a foldable electronic device (in a folded state) in a free space scenario;

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

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

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

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

[0031] Figure 19 is an S curve and an efficiency curve of a GPS-L1 antenna without a parasitic branch and a GPS-L1 antenna with a long parasitic branch arranged in a middle portion of a top edge of a foldable electronic device (in a folded state) in a right-hand holding scenario;

[0032] Figure 20 is a top view schematic diagram of the sixth antenna assembly in the folded state provided by the embodiment of the present application;

[0033] Figure 21 is a top view schematic diagram of the sixth antenna assembly in the folded state provided by the embodiment of the present application;

[0034] Figure 22 is the S curve and efficiency curve of the GPS-L1 antenna provided with the first parasitic branch and the GPS-L1 antenna provided with the second parasitic branch in the top edge middle part of the foldable electronic device (folded state) in free space;

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

[0036] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the embodiments described in the present application are only part of the embodiments, not all the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0037] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0038] The terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects, not to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example: an assembly or device including one or more components is not limited to the listed one or more components, but can optionally include one or more components that are not listed but are inherent to the product exemplified, or one or more components that should be included based on the described function.

[0039] In general electronic devices, the GPS antenna is often arranged on the corner of the electronic device to ensure better environment and higher efficiency, and higher proportion of the upper hemisphere of the directivity pattern. In the foldable electronic device, in the folding scene, the left hand holds the fingers and the right hand holds the user's tiger mouth, which will cover the GPS antenna, and the user may hold the GPS antenna on the corner when looking at the map. The performance comparison of the GPS antenna in the free scene and the hand-holding scene shows that in the hand-holding scene, the GPS antenna frequency deviation is serious, reaching more than 200 MHz, and the GPS antenna in the GPS-L1 frequency band (near 1.575 GHz) has no resonance in the hand-holding scene. Compared with the free scene, the performance decreases by nearly 10 dB. The reasons for the efficiency decrease mainly include 1. the efficiency decrease caused by folding. 2. the influence of human body energy absorption in hand-holding. 3. the influence of frequency deviation. How to improve the efficiency of the GPS frequency band in the folding and hand-holding state and improve the antenna performance of the closed navigation has become a technical problem to be solved.

[0040] Referring to Figure 1 , Figure 1 A structural schematic diagram of a foldable electronic device is provided in the embodiments of the present application. The foldable electronic device 1000 includes but is not limited to a mobile phone, a tablet computer, a notebook computer, a computer, a wearable device, a drone, and the like, which has a communication function and can be folded or unfolded. The embodiments of the present application take a mobile phone as an example for description, and other electronic devices can refer to the embodiments.

[0041] For ease of description, referring to Figure 2 , the thickness direction of the foldable electronic device 1000 is defined as the Z-axis direction, the length direction is defined as the Y-axis direction, and the width direction is defined as the X-axis direction. The Z-axis, the Y-axis, and the 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, and 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] Referring to Figure 3 , the foldable electronic device 1000 provided in the embodiments of the present application at least includes a foldable main body 10 and an antenna assembly 20.

[0043] Referring to Figure 3 , the foldable main body 10 includes a first main body 11 and a second main body 13. The first main body 11 and the second main body 13 are movably connected to present a folded state or an unfolded state. In the embodiments of the present application, the movable connection is not limited to sliding connection, or rotary connection, or rotary and sliding combination, etc., so that the first main body 11 and the second main body 13 are changed from the folded state to the unfolded state, or from the unfolded state to the folded state.

[0044] Optionally, the first body 11 is an upper half of the foldable electronic device 1000, and the second body 13 is a lower half of the foldable electronic device 1000. When the foldable electronic device 1000 is in an unfolded portrait mode, the lower half of the foldable electronic device 1000 is a part facing the ground.

[0045] The environment in which the foldable electronic device 1000, the foldable body 10, and the antenna assembly 20 are located is described below with reference to the accompanying drawings.

[0046] Referring to Figure 2 The foldable electronic device 1000 further includes a first housing 41 and a second housing 42. The first housing 41 covers the outer side of the first body 11, and the second housing 42 covers the outer side of the second body 13. Each housing includes a bottom plate (which can also be referred to as a back cover) and a frame surrounding the periphery of the bottom plate. The bottom plate and the frame surrounding the periphery thereof include a receiving space. The radiator of the antenna assembly 20 can be part of the frame or embedded on the frame. The first body 11 is disposed on the bottom plate of the first housing 41 (received in the first housing), and the second body 13 is disposed on the bottom plate of the second housing 42 (received in the second housing). The receiving space is also used to receive a main board, a camera module, a receiver module, a battery, various sensors, and the like. The material of the foldable body 10 is a metal conductive material. The present application is not limited to the shape of the first body 11 and the second body 13. Optionally, the first body 11 can be substantially rectangular, and the second body 13 can be substantially rectangular. The shape is not specifically limited and includes, but is not limited to, a rectangle, a square, an irregular shape, and the like. The foldable body 10 is provided with a through hole, a notch, a slot, and the like to receive the devices.

[0047] The present application does not specifically limit the foldable body 10, which can include, 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 a circuit board, form a receiving slot for receiving electronic devices, and form an empty notch. The middle plate can be a metal material or a non-metal material or a combination of metal and non-metal materials. When the middle plate is a metal material, such as magnesium-aluminum alloy, the middle plate can also serve as a reference ground system of the foldable electronic device 1000.

[0048] In other embodiments, the floor and the frame are a split structure. The middle plate and the frame are an interconnected structure.

[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, the first body 11 and the second body 13 are respectively disposed in the upper and lower layers along the Z-axis direction.

[0050] The unfolded state is that the first body 11 is translated from the folded state to the overlapping area between the first body 11 and the second body 13 is less than a preset area, for example, 20%, 15%, 10%, 5%, 1%, 0% of the area of the first body 11. At this time, the foldable electronic device 1000 includes, but is not limited to, a sliding cover phone.

[0051] Referring to 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 slides along the extension direction of the sliding rail to the folded state or the unfolded state. Wherein, the first body 11 is located in the solid line position in Figure 3 , the folded state, and the first body 11 is located in the dotted line position in Figure 3 , the unfolded state.

[0052] Referring to Figure 4 , the first body 11 and the second body 13 are connected by a rotating shaft. The axis direction of the rotating shaft is the X-axis direction. The first body 11 and / or the second body 13 rotates around the rotating shaft to the folded state or the unfolded state. Wherein, the first body 11 is located in the solid line position in Figure 4 , the folded state, and the first body 11 is located in the dotted line position in Figure 4 , the unfolded state.

[0053] The embodiments of the present application take the rotating connection between the first body 11 and the second body 13 as an example for illustration.

[0054] Referring to Figure 2 , the electronic device 1000 further includes a flexible display screen 200. The flexible display screen 200 is arranged on the front side of the foldable 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 fixed part 210, a bending part 220, and a second fixed part 230 arranged in sequence. The first fixed part 210 is fixedly connected to the first shell 41, and the second fixed part 230 is fixedly connected to the second shell 42, and the fixing mode includes, but is not limited to, adhesion and the like. The bending part 220 is arranged on the rotating connection mechanism, and the connection mode of the two can be fixed connection or non-connection state. The bending part 220 is bent when the foldable electronic device 1000, and the shape when bent includes, but is not limited to, a water drop type or a U type.

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

[0056] Referring to Figure 5 , the first body 11 and the second body 13 are both conductive members. 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 conductive plate structures close to each other.

[0057] In an embodiment, the first connecting edge 112 and the second connecting edge 132 are rotatably electrically connected by an electrical connecting member 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 arranged in alignment with each other and spaced apart. In other words, the first body 11 and the second body 13 have similar or identical lengths in the Y-axis direction.

[0058] Referring to Figure 5 , when unfolded, the first side edge 113 and the third side edge 133 are arranged in a line, and the second side edge 114 and the fourth side edge 134 are arranged in a line. When folded, the first side edge 113 and the third side edge 133 are arranged in alignment and spaced apart. The second side edge 114 and the fourth side edge 134 are arranged in alignment and spaced apart, and the top edge 111 and the bottom edge 131 are arranged in alignment and spaced apart.

[0059] Optionally, when folded, the top edge 111 and the bottom edge 131 are open circuits, and the first connecting edge 112 and the second connecting edge 132 are short circuits. The foldable body 10 forms a gap cavity structure with three open sides, i.e., open circuit ends, and one short circuit 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, which is 0.5mm-4mm, but is not limited to this data.

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

[0061] Referring to Figure 5 The top edge 111 includes a first end 111a and a second end 111b opposite to each other. 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 of the top edge 111 and the first side edge 113, and the second end 111b is also the connection position of the top edge 111 and the second side edge 114.

[0062] Referring to 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 arranged on the top edge 111. Optionally, the first radiator 21 can be parallel to the top edge 111. The first radiator 21 does not overlap with the first main body 11 in the thickness direction.

[0064] The first radiator 21 is made of 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 a metal frame of a mobile phone, a metal frame inlaid in a plastic frame, a metal radiator in the frame or on the surface, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct structuring (LDS) antenna, a print direct structuring (PDS) antenna, a conductive sheet antenna (such as a metal support antenna), etc. In this embodiment, the first radiator 21 is taken as an example of a metal frame of a mobile phone.

[0065] Optionally, the shape of the first radiator 21 is not limited in this application. For example, the shape of the first radiator 21 includes but is not limited to strip, sheet, rod, coating, film, etc. Figure 5 The first radiator 21 shown is only an example and cannot limit the shape of the first radiator 21 provided in this application. In this embodiment, the first radiator 21 is in the form of a strip. The extension track of the first radiator 21 is not limited in this application. In this embodiment, the first radiator 21 is in the form of a straight line. In other embodiments, the first radiator 21 can also extend in the form of a bent line, a curved line, etc. The first radiator 21 described above can be a line with uniform width in the extension track, or a strip with non-uniform width, such as a gradually changing width or a widened area. In this embodiment, the first radiator 21 is in the form of a strip.

[0066] Please refer to Figure 5 The first radiator 21 includes a first free end A, a first feeding point B and a first grounding end C arranged in sequence. The first free end A is an end physically disconnected from other conductive structures. The present application does not make specific limitations on the position of the feeding point B on the first radiator 21. The first grounding end C is electrically connected to the reference ground. When the first main body 11 is a conductive member and part of the reference ground system, the first grounding end C is electrically connected to the first main body 11, and the electrical connection includes but is not limited to being achieved by a conductive spring, physical connection (interconnected as a whole), welding, through a coaxial line, through a microstrip line, through conductive glue, etc.

[0067] Please refer to Figure 5 、 Figure 6a , Figure 6a The dashed box in the figure is the area covered by the foldable electronic device 1000 when held in the left-hand folding state. 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 the foldable main body 10 is in the handheld folding state, so as to avoid the left thumb from covering the first radiator 21. For example, the first preset avoidance distance La is about 10 mm.

[0068] Please refer to Figure 5 and Figure 6b , Figure 6b The dashed box in the figure is the area covered by the foldable electronic device 1000 when held in the right-hand folding state. The distance L2 between the first grounding end C and the second end 111b is greater than or equal to the first preset avoidance distance La, which is used to avoid the thumb when the foldable main body 10 is in the handheld folding 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 folding state can be effectively avoided, the frequency band stability of the foldable electronic device 1000 when held in the folding state is improved, especially the stability of the GPS signal, and the cover navigation function is realized.

[0069] The first signal source 23 is electrically connected to the first feeding point B, for feeding an excitation current to the first radiator 21, so as to excite the first radiator 21 to generate a resonance mode supporting the GPS frequency band. The GPS frequency band includes but is not limited to GPS-L1 and GPS-L5. The present 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 and the like. The signal source 24 is used to emit 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, so as to receive or emit an electromagnetic wave signal covering a required frequency band, which covers the frequency band corresponding to the resonant current.

[0071] In the embodiment of the application, the signal source 24 is arranged on the mainboard. The mainboard is arranged on the foldable main body 10. The electrical connection mode of the signal source 24 and the feed point B includes but is not limited to the following modes: through a conductive spring, welding, through a coaxial line, through a microstrip line, through conductive glue and the like. Specifically, the signal source 24 is electrically connected to the feed point B through a feed spring (conductive spring) arranged on the mainboard.

[0072] Optionally, referring to Figure 5 , the foldable electronic device 1000 further includes a matching circuit M1 electrically connected between the feed point B and the signal source 24. The matching circuit M1 is used to realize impedance matching at the signal source 24 end and the radiator end, so as to excite the resonant mode. The matching circuit M1 includes but is not limited to a capacitor, an inductor and the like.

[0073] Specifically, the matching circuit M1 includes but is not limited to a capacitor, an inductor, a series device of a capacitor and an inductor, a parallel device of a capacitor and an inductor, a parallel device of the above-mentioned series device and a capacitor, a parallel device of the above-mentioned series device and an inductor, a parallel device of two above-mentioned series devices, a series device of two above-mentioned parallel devices and the like.

[0074] Referring to Figure 5 , at least part of the second radiator 22 is arranged on the bottom edge 131. Optionally, the second radiator 22 can be parallel to the bottom edge 131. The orthogonal projection of the second radiator 22 in the thickness direction does not overlap with the orthogonal projection of the second main body 13 in the thickness direction. The structure, form and material of the second radiator 22 refer to the structure, form and material of the first radiator 21.

[0075] Referring to Figure 5 , the second radiator 22 includes a second free end D and a second ground end E arranged at intervals. The second free end D is a physically disconnected end of other conductive structures. The second ground end E is grounded. When the second main body 13 is a conductive member and is part of a reference ground system, the second ground end E is electrically connected to the second main body 13. The electrical connection mode includes but is not limited to the following modes: through a conductive spring, physical connection (interconnected as a whole), welding, through a coaxial line, through a microstrip line, through conductive glue and the like.

[0076] Referring toFigure 7 When the foldable main body 10 is in the folded state, the first ground end C points in the direction of the first free end A, and the second ground end E points in the direction of the second free end D. That is, the free end of the first radiator 21 points in the opposite direction of the free end of the second radiator 22.

[0077] In this embodiment, the first main body 11 and the second main body 13 are both conductive structures. When the first main body 11 and the second main body 13 are folded, the first main body 11 and the second main body 13 form a capacitive structure with a small gap between them. When the signal source 24 excites the first radiator 21, the capacitive structure formed by the first main body 11 and the second main body 13 has a current distribution, and an electric field is formed between the first main body 11 and the second main body 13 (the electric field direction is that the first main body 11 points to the second main body 13, or the second main body 13 points to the first main body 11). Among them, the current flowing on the first main body 11 is opposite to the current flowing on the second main body 13. For example, the current on the first main body 11 is from the top edge 111 to the first connecting edge 112, and the current on the second main body 13 is from the second connecting edge 132 to the bottom edge 131. That is, the first main body 11 and the second main body 13 generate currents in opposite directions. Under the capacitive structure formed by the first main body 11 and the second main 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 opposite currents on the first radiator 21 and the second radiator 22 not only cause the mutual cancellation of far-field energy, thereby causing the efficiency of the frequency band supported by the first radiator 21 to decrease, but also cause it to be unable to form a resonance mode that improves efficiency.

[0078] This embodiment designs the free end of the first radiator 21 to point in the opposite direction of the free end of the second radiator 22. It conforms to the current distribution on the first radiator 21 and the second radiator 22 under the capacitive structure formed by the first main body 11 and the second main body 13, avoids the formation of opposite currents on the first radiator 21 and the second radiator 22, and is beneficial to the coupling of the first radiator 21 and the second radiator 22 and the formation of a resonance mode together.

[0079] Please refer to Figure 8 In the thickness direction of the foldable main body 10, at least part of the first radiator 21 and the second radiator 22 are opposite and coupled. 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 resonance current.

[0080] Please refer to Figure 8When the first body 11 and the second body 13 are in the folded state, the first body 11 and the second body 13 are arranged in the thickness direction. The first radiator 21 is at least partially overlapped with the area where the second radiator 22 is located in the thickness direction of the foldable body 10. The first radiator 21 and the second radiator 22 are spaced apart and coupled. When the signal source 24 excites the first radiator 21 to generate a current, a capacitive 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. At this time, the second radiator 22 cannot form a resonance mode with the first radiator 21 because it cannot be coupled with the first radiator 21. When the foldable body 10 is in the folded state, the second radiator 22 and the second radiator 22 are both close to the first radiator 21, and the second radiator 22 and the first radiator 21 both have the condition to form a coupled capacitive 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 to improve the frequency band supported by the first radiator 21.

[0082] By placing the first radiator 21 in the middle of the top edge 111 of the foldable electronic device 1000 and reserving a predetermined clearance distance between the two ends of the first radiator 21 and the corner position of the top edge 111, the first radiator 21 is not blocked by the hand when holding in the folded state, thereby avoiding the frequency offset problem caused by hand holding, and enabling the foldable electronic device 1000 to support the cover navigation function. In the folded state, the first radiator 21 can be coupled with the reversely arranged second radiator 22, 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 to improve the efficiency of the GPS frequency band and improve the antenna performance of the cover navigation.

[0083] The antenna assembly 20 provided by the present application ensures that the fingers cannot hold the GPS antenna main branch (first radiator 21) in the folded state by placing the GPS antenna in the middle of the top edge 111. In the left-hand holding scenario, the fingers cannot reach the upper edge, and in the right-hand holding scenario, the right-hand knuckle also leaves a gap with the GPS antenna at this time, ensuring that the GPS antenna cannot be completely held.

[0084] Please refer to Figure 9 , Figure 9is a structure diagram of a GPS-L1 antenna without a parasitic branch and arranged in the middle of the top edge 111 of the foldable electronic device 1000 (in a folded state).

[0085] Please refer to Figure 10 , Figure 10 is the S-curve and efficiency curve of the GPS-L1 antenna without a parasitic branch and arranged in the middle of the top edge 111 of the foldable electronic device 1000 (in a folded state) in free space and in a 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] As can be seen from curves a1 and a2, the GPS-L1 antenna arranged in the middle of the top edge 111 of the foldable electronic device 1000 has almost no frequency offset in free space and in the right-hand holding scenario. As can be seen from the efficiency curves, the GPS-L1 antenna arranged in the middle of the top edge 111 of the foldable electronic device 1000 has good efficiency in the right-hand holding scenario.

[0087] Please refer to Figure 11 , Figure 11 is Figure 7 the S-curve and efficiency curve of the GPS-L1 antenna with a parasitic branch and the GPS-L1 antenna without a parasitic branch and arranged in the middle of the top edge 111 of the foldable electronic device 1000 (in a folded state). Among them, curve a1 is the S-curve of the GPS-L1 antenna without a parasitic branch, curve a2 is the S-curve of the GPS-L1 antenna with a parasitic branch, curve b1 is the radiation efficiency curve of the GPS-L1 antenna without a parasitic branch, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with a parasitic branch, curve c1 is the total efficiency curve of the GPS-L1 antenna without a parasitic branch, and curve c2 is the total efficiency curve of the GPS-L1 antenna with a parasitic branch.

[0088] From Figure 10 and Figure 11 the efficiency curves, it can be seen that by adding a parasitic branch, the overall radiation efficiency of the GPS-L1 antenna provided by the present application in the right-hand holding scenario is improved, and the efficiency bandwidth is also improved.

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

[0090] As can be seen from the efficiency curve in the figure, after adding the parasitic branch, the efficiency of the GPS frequency band in the hand-holding scenario is significantly improved, and the peak efficiency is increased by nearly 3 dB.

[0091] The present application does not specifically limit the length of the first radiator 21 opposite to the second radiator 22.

[0092] Please refer to Figure 8 In the folded state, the orthogonal 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 is opposite to and coupled with the second radiator 22.

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

[0094] If the length opposite between the first radiator 21 and the second radiator 22 is small, it may cause the coupling area between the first radiator 21 and the second radiator 22 to be relatively small, especially in the case that the first radiator 21 and the second radiator 22 are not co-located, the coupling effect between the first radiator 21 and the second radiator 22 is not enough to make the second radiator 22 generate resonant current under the excitation of the signal source. The present application designs the length of the first radiator 21 opposite to the second radiator 22 to be greater than or equal to 1 / 2 of the total length of the first radiator 21, so that the first radiator 21 and the second radiator 22 have a large enough coupling effect, and then 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 less 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 current in the longitudinal (Y-axis direction) mode on the reference ground plane when a resonant current is generated, to improve the radiation efficiency of the GPS frequency band.

[0096] In this application, the distance between the first ground end C and the midpoint of the top edge 111 is less than or equal to a first preset distance. The first preset distance is not limited in this application, and can be 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 end C is close to the midpoint of the top edge 111, so that the first radiator 21 forms less current in the transverse (X-axis direction) mode and more current in the longitudinal mode on the reference ground plane when a resonant current is generated, and the current in the longitudinal mode can more effectively improve the radiation efficiency of the GPS frequency band.

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

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

[0100] Optionally, the second ground end E is located on the top edge 111. By locating the second ground end E on the top edge 111, the second radiator 22 is away from being held by the left hand when the foldable electronic device 1000 is folded. In addition, by locating the second ground end E on the top edge 111, the resonant current on the second radiator 22 forms a longitudinal mode floor current on the reference floor, compared to the resonant current on the second radiator 22 forming a transverse mode floor current on the reference floor when the second ground end E is located on the first side edge 113, the modes of the floor currents on the reference floor of the first radiator 21 and the second radiator 22 are not orthogonal, the first radiator 21 and the second radiator 22 both form a longitudinal mode floor current on the reference floor, which is beneficial to improving the efficiency of the GPS of the resonant current on the second radiator 22 and the resonant current of the second radiator 22. Wherein, the reference floor can be the foldable main body 10.

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

[0102] Optionally, please refer to Figure 13 , the bottom edge 131 includes a third end 131a and a fourth end 131b located opposite to each other. The distance between the second ground end E and the third end 131a is less than the distance between the second ground end E and the fourth end 131b. The distance between the second ground 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 ground end E is close to the connection point between the two adjacent edges intersecting the reference floor, that is, the large current return-to-ground position of the second radiator 22 is located at the connection point (corner point) between the two adjacent edges intersecting the reference floor, so as to reduce the reverse current formed by the floor current of the second radiator 22 along the edge of the reference floor. The floor current on the reference floor has a greater contribution to the radiation of the GPS, the more the reverse current on the reference floor, the more the far-field energy is offset, and the contribution of the floor current on the reference floor to the radiation of the GPS is reduced. The embodiment reduces the reverse current formed by the floor current of the second radiator 22 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, and improve the efficiency of the second radiator 22 and the in-band efficiency of the first radiator 21.

[0103] Please refer to Figure 14 , Figure 14The S curve and efficiency curve of the GPS-L1 antenna without a parasitic branch and the GPS-L1 antenna with a parasitic branch (the second radiator 22) close to the corner of the ground in the free space scenario are shown in the top edge 111 of the foldable electronic device 1000 (in the folded state). Among them, the curve a2 is the S curve of the GPS-L1 antenna without a parasitic branch, the curve a1 is the S curve of the GPS-L1 antenna with a parasitic branch (the second radiator 22) close to the corner of the ground, the curve b2 is the radiation efficiency curve of the GPS-L1 antenna without a parasitic branch, the curve b1 is the radiation efficiency curve of the GPS-L1 antenna with a parasitic branch (the second radiator 22) close to the corner of the ground, the curve c2 is the total efficiency curve of the GPS-L1 antenna without a parasitic branch, and the curve c1 is the total efficiency curve of the GPS-L1 antenna with a parasitic branch (the second radiator 22) close to the corner of the ground.

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

[0105] The first signal source 23 is further configured to excite 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, and the like.

[0106] The electrical length and the physical length of the first radiator 21 and the second radiator 22 are illustrated below in conjunction with the accompanying drawings.

[0107] In the 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 the present application can satisfy the following formula:

[0109]

[0110] Wherein, 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 the free space.

[0111] The first radiator 21 and the second radiator 22 generate a first resonant mode and a second resonant mode under the signal source. The resonant current of the first resonant mode includes a first current distributed on the first radiator 21 and a second current distributed on the second radiator 22. The first current and the second current are same-direction currents. The first current is a 1 / 4 wavelength mode of a first resonant frequency point, and the electrical length of the first radiator 21 is close to the 1 / 4 wavelength of the first resonant frequency point. The intensity of the first current is greater than the intensity of the second current, and the first current determines the resonant frequency point of the first resonant mode, i.e., the first resonant frequency point is the resonant frequency point of the first resonant mode, and the first resonant frequency point is also the center frequency point 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 same-direction currents. The third current and the first current are same-direction currents. The fourth current is a 1 / 4 wavelength mode of a second resonant frequency point, and the electrical length of the second radiator 22 is close to the 1 / 4 wavelength of the second resonant frequency point. The intensity of the fourth current is greater than the intensity of the third current, and the fourth current determines the resonant frequency point of the second resonant mode, i.e., the second resonant frequency point is the resonant frequency point of the second resonant mode. The second resonant frequency point is greater than the first resonant frequency point.

[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 point of the second radiator 22 is greater than or equal to the resonant frequency point of the first radiator 21. Further, the second resonant frequency point is slightly higher than the first resonant frequency point. The first resonant mode and the second resonant mode are fused, 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 embodiment, please refer to Figure 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] Specifically, please refer to Figure 15The antenna assembly 20 further comprises a third radiator 30 and a second signal source (shielded). 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 frequency band, the MHB frequency band, and the UHB frequency band. In other words, the second radiator 22 can not only act as a parasitic radiator of the first radiator 21 when the foldable electronic device 1000 is in a folded state, but also can act 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 frequency band, but also can be used to support at least one of the MHB frequency band and the UHB frequency band to support more frequency bands.

[0116] In the embodiment, the physical lengths of the first radiator 21 and the second radiator 22 can be close to each other and are arranged on the top edge 111, so as to avoid the folding hand-holding area and improve the folding hand-holding performance. Meanwhile, 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 optional embodiment, please refer to Figure 16 and Figure 17 The physical length of the second radiator 22 is greater than the physical length of the first radiator 21.

[0118] Optionally, please refer to Figure 16 The antenna assembly 20 further comprises 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 ground end 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, so as to meet the condition 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 less than the electrical length of the first radiator 21. Here, the electrical length of the first radiator 21 includes the electrical length of the first radiator 21 itself and the electrical length increment caused by the first inductive element 25.

[0119] The specific devices included in the first inductive element 25 are not specifically described in the present application. Optionally, the first inductive element 25 includes but is not limited to inductors, capacitors, and the like. For example, the first inductive element 25 is a large inductor, for example, 10 nH, but is not limited to this data.

[0120] Optionally, please refer to Figure 17The antenna assembly 20 further comprises a capacitive element 26. One end of the capacitive element 26 is electrically connected to the second ground terminal 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 as to satisfy the condition 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 less than the electrical length of the first radiator 21. Here, 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 specific device included in the capacitive element 26 is not specifically described in the present application. Optionally, the capacitive element 26 includes, but is not limited to, inductors, capacitors, and the like. For example, the capacitive element 26 is a large capacitor.

[0122] Optionally, the antenna assembly 20 can simultaneously include the first inductive element 25 and the capacitive element 26 described above.

[0123] In the present embodiment, the physical length of the second radiator 22 is greater than the physical length of the first radiator 21, and the first radiator 21 can also serve as a low-frequency antenna. By avoiding the second ground terminal E of the second radiator 22 from the folding hand-held area, the folding hand-held performance is improved. At the same time, the function of the second radiator 22 is increased, which not only improves the efficiency of the first radiator 21 supporting the GPS frequency band, but also supports the LB frequency band, and can realize the cover navigation and cover low-frequency call.

[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 ground plane can be equivalent to a large capacitor, and this area is relatively sensitive to hand holding. In the present embodiment, since the second radiator 22 is coupled to the first radiator 21, the second radiator 22 plays a role of pulling 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. Thus, in the folded hand-held state, the electrical length of the second radiator 22 is greater than the electrical length of the first radiator 21, the resonant frequency point of the second resonant mode is less than the resonant frequency point of the first resonant mode, and the efficiency of the first radiator 21 supporting the GPS frequency band is also improved, and the cover navigation performance is improved.

[0126] Optionally, please refer to Figure 18The second radiator 22 further comprises a second feed point F between the second free end D and the second ground end E. The antenna assembly 20 further comprises a third signal source 27. The third signal source 27 is electrically connected to the second feed 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 acts as a parasitic branch to improve the efficiency of the GPS frequency band, but also acts as a main branch to support the LB frequency band.

[0127] In the first alternative embodiment, the physical length of the second radiator 22 is greater than the physical length of the first radiator 21. The second radiator 22 can be referred to as a long parasitic branch.

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

[0129] It can be seen that after adding the long parasitic branch, the efficiency of the GPS frequency band under the hand-holding scenario is significantly improved.

[0130] In the second alternative embodiment, the physical length of the second radiator 22 is less than or equal to the physical length of the first radiator 21.

[0131] Please refer to Figure 20 The antenna assembly 20 further comprises a second inductive element 28. One end of the second inductive element 28 is electrically connected to the second feed point F or the second ground 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 as to satisfy that the physical length of the second radiator 22 is less than or equal to the physical length of the first radiator 21, while the electrical length of the second radiator 22 is greater than the electrical length of the first radiator 21. Among them, 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 second inductive element 28 includes, but is not limited to, an inductor, a capacitor, etc. For example, the second inductive element 28 is a large inductor, for example, 10 nH, but is not limited to this data.

[0133] The distance between the second ground end E and the third end 131a is less than the distance between the second ground end E and the fourth end 131b. That is, the second ground end E is located close to the third end 131a. The distance between the second ground 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 ground end E is close to the connection point between the two adjacent edges intersecting the reference floor, that is, the large current ground position of the second radiator 22 is located at the connection point (corner point) between the two adjacent edges intersecting the reference floor, so as to reduce the reverse current formed along the edge of the reference floor by the floor current formed by the second radiator 22 on the reference floor. The floor current on the reference floor has a large contribution to the radiation of GPS, the more the reverse current on the reference floor, the more the far-field energy is offset, and the contribution of the floor current on the reference floor to the radiation of GPS is reduced. The embodiment reduces the reverse current formed along the edge of the reference floor by the floor current formed by the second radiator 22 on the reference floor, increases the contribution of the floor current on the reference floor to the radiation of GPS, and improves the efficiency of the second radiator 22 and the in-band efficiency of the first radiator 21.

[0134] Please refer to Figure 21 The antenna assembly 20 further includes an adjusting circuit 29. The adjusting circuit 29 is electrically connected to the second ground end E. The adjusting 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 in the unfolded state, and the electrical length of the second radiator 22 is less than the electrical length of the first radiator 21 in the folded state. For example, the adjusting 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 end E, and the other end of the switch unit K1 is selectively directly grounded or grounded through the capacitor device Cn. In the unfolded state, the switch unit K1 is switched 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 is switched 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 with an electrical length greater than that of the first radiator 21 is referred to as a first parasitic branch, and the second radiator 22 with an electrical length less than that of the first radiator 21 is referred to as a second parasitic branch.

[0136] Referring to Figure 22 , Figure 22 are S curves and efficiency curves of the GPS-L1 antenna with the first parasitic branch and the GPS-L1 antenna with the second parasitic branch in the middle of the top edge 111 of the foldable electronic device 1000 (in a folded state) under 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] Referring to Figure 23 , Figure 23 are S curves and efficiency curves of the GPS-L1 antenna with the first parasitic branch and the GPS-L1 antenna with the second parasitic branch in the middle of the top edge 111 of the foldable electronic device 1000 (in a folded state) under 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.

[0138] From Figure 22 and Figure 23 it can be seen that in the hand-held scenario, the peak efficiency of the antenna assembly 20 with the second parasitic branch is slightly higher than that of the antenna assembly 20 with the first parasitic branch; under free space, the overall efficiency and bandwidth of the antenna assembly 20 with the first parasitic branch are higher than those of the antenna assembly 20 with the second parasitic branch.

[0139] The antenna assembly 20 provided by the application can improve the GPS antenna performance in the hand-held scenario at the low frequency side or the high frequency side of the resonant frequency point of the first radiator 21. In the hand-held scenario, the GPS antenna in the middle of the top edge 111 can improve the efficiency by 3-4 dB compared with the corner position, and the efficiency of the GPS antenna can be further improved by 3-4 dB after adding a suitable parasitic branch, the overall efficiency is improved by 6-8 dB compared with the corner position, and the performance is obviously improved.

[0140] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and are not to be construed as limiting the application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application, and these improvements and refinements are also considered as the protection scope of the application.

Claims

1. A foldable electronic device, characterized by, The foldable main body comprises a first main body and a second main body; the first main body and the second main body are movably connected to present a folded state or an unfolded state; the first main body comprises a top edge comprising a first end and a second end arranged oppositely; the second main body comprises a bottom edge; when the foldable main body is in the unfolded state, the top edge and the bottom edge are respectively located at two opposite sides of the electronic device; when the foldable main body is in the folded state, the top edge and the bottom edge overlap in a thickness direction; The antenna assembly comprises: A first radiator arranged on 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 clearance distance; the distance between the first grounding end and the second end is greater than or equal to the first preset clearance distance; the first grounding end is grounded; A first signal source electrically connected to the first feeding point, for feeding an excitation current to the first radiator to excite the first radiator to generate a resonance mode supporting a GPS frequency band; A second radiator; 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 arranged at intervals; the second grounding end is grounded; When the foldable main body is in the folded state, the direction in which the first grounding end points to the first free end is opposite to the direction in which the second grounding end points to the second free end; in the thickness direction of the foldable main body, at least part of the first radiator and the second radiator are opposite and coupled.

2. The foldable electronic device of claim 1, wherein, When the foldable main body is in the folded state, the orthographic projection of the second free end in the thickness direction of the foldable main body is located on the first radiator.

3. The foldable electronic device of claim 2, wherein, The length of the first radiator opposite to the second radiator is greater than or equal to 1 / 2 of the total length of the first radiator.

4. The foldable electronic device of claim 1, wherein, The distance between the first free end and the first end is smaller than the distance between the first grounding end and the second end.

5. The foldable electronic device of claim 4, wherein, The distance between the first grounding end and the midpoint of the top edge is smaller than or equal to a first preset distance.

6. The foldable electronic device of claim 1, wherein, The bottom edge comprises a third end and a fourth end arranged oppositely; when the foldable electronic device is in the folded state, the third end and the first end are arranged oppositely in the thickness direction; the fourth end and the second end are arranged oppositely in the thickness direction; 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 of claim 6, wherein, The distance between the second grounding end and the third end is greater than or equal to a second preset clearance distance; or The distance between the second grounding end and the third end is smaller than or equal to 1 / 16 wavelength of the GPS frequency band.

8. The foldable electronic device of claim 1, wherein, The second grounding end is located on the top edge.

9. The foldable electronic device of any of claims 1-8, wherein, The second radiator has an electrical length less than or equal to that of the first radiator, and a resonant frequency greater than or equal to that of the first radiator.

10. The foldable electronic device of claim 9, wherein, The second radiator has a physical length less than or equal to that of the first radiator.

11. The foldable electronic device of claim 10, wherein, The antenna assembly further comprises a third radiator and a second signal source, the third radiator is arranged on the bottom side, the third radiator is coupled with the second radiator, and the second signal source is electrically connected to the third radiator, and the second signal source is configured to excite the third radiator and the second radiator to support at least one of an LB frequency band, an MHB frequency band, and a UHB frequency band.

12. The foldable electronic device of claim 9, wherein, The second radiator has a physical length greater than that of the first radiator.

13. The foldable electronic device of claim 12, wherein, The antenna assembly further comprises a first inductive element, one end of the first inductive element is electrically connected to the first feeding point or the first ground terminal, and the other end of the first inductive element is grounded, and the first inductive element is configured to increase the electrical length of the first radiator.

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

15. The foldable electronic device of any of claims 1-8, wherein, The second radiator has an electrical length greater than that of the first radiator.

16. The foldable electronic device of claim 15, wherein, The second radiator further comprises a second feeding point between the second free end and the second ground terminal, and the antenna assembly further comprises a third signal source electrically connected to the second feeding point, and the third signal source is configured to excite the second radiator to support an LB frequency band.

17. The foldable electronic device of claim 16, wherein, The second radiator has a physical length greater than that of the first radiator; or The second radiator has a physical length less than or equal to that of the first radiator, and the antenna assembly further comprises a second inductive element, one end of the second inductive element is electrically connected to the second feeding point or the second ground terminal, and the other end of the second inductive element is grounded, and the second inductive element is configured to increase the electrical length of the second radiator; the bottom side comprises a third end and a fourth end arranged opposite to each other, a distance between the second ground terminal and the third end is less than a distance between the second ground terminal and the fourth end, and the distance between the second ground terminal and the third end is less than or equal to 1 / 16 wavelength of the GPS frequency band.

18. The foldable electronic device of any of claims 1-8, wherein, The antenna assembly further comprises an adjusting circuit electrically connected to the second ground terminal, and the adjusting circuit is configured to adjust the electrical length of the second radiator, the electrical length of the second radiator in an unfolded state is greater than that of the first radiator, and the electrical length of the second radiator in a folded state is less than that of the first radiator.

19. The foldable electronic device of any of claims 1-8, wherein, The first signal source is further configured to excite the first radiator to support at least one of an N78 frequency band, a Wi-Fi 2.4G frequency band, and a Wi-Fi 5G frequency band.

Images