Electronic device

Abstract

This application provides an electronic device. The frame includes a gripping area and an overlap area. The antenna assembly includes a first radiator and a first signal source. The first radiator includes a first radiating segment, a second radiating segment, and a third radiating segment. The second radiating segment includes a first feed point. The first signal source is electrically connected to the first feed point to excite the formation of a first resonant mode supporting a first frequency band on the first radiator. The first or third radiating segment includes a recessed portion located inside the overlap area of ​​the frame and spaced apart from it. A first resonant current of the first resonant mode is distributed at least in the recessed portion and the second radiating segment. At least a portion of the second radiating segment is the gripping area of ​​the frame. The second radiating segment is used to form a dielectric loading of the first resonant mode when the device is gripped. This application reduces the absorption of electromagnetic waves transmitted and received by the antenna by the hand, improving antenna performance in handheld scenarios.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to an electronic device. Background Technology

[0002] Mobile phones and other electronic devices are commonly used in handheld scenarios. Therefore, reducing the absorption of electromagnetic waves transmitted and received by the antenna by the hand and improving the antenna performance of electronic devices in handheld scenarios has become a technical problem that needs to be solved. Summary of the Invention

[0003] This application provides an electronic device that reduces the absorption of electromagnetic waves transmitted and received by the antenna by the hand, thereby improving the antenna performance in handheld scenarios.

[0004] This application provides an electronic device comprising:

[0005] The frame includes a gripping area and an overlapping area. The gripping area is held by a hand in a first gripping scenario and by a thumb in a second gripping scenario. The overlapping area is overlapped by fingers in a third gripping scenario.

[0006] An antenna assembly includes a first radiator and a first signal source. The first radiator includes a first radiating segment, a second radiating segment, and a third radiating segment interconnected and arranged sequentially. The end of the first radiating segment away from the second radiating segment is a first free end, and the end of the third radiating segment away from the second radiating segment is a first ground end. The second radiating segment includes a first feed point. The first signal source is electrically connected to the first feed point and is used to excite the formation of a first resonant mode supporting a first frequency band on the first radiator. The first radiating segment or the third radiating segment includes a recessed portion, which is located inside the overlap area of ​​the frame and spaced apart from the overlap area of ​​the frame. The first resonant current of the first resonant mode is at least distributed in the recessed portion and the second radiating segment. At least a portion of the second radiating segment is the holding area of ​​the frame, and the second radiating segment is used to form a dielectric loading of the first resonant mode under holding conditions.

[0007] This application sets a first signal source electrically connected to a first feed point to excite a first resonant mode supporting a first frequency band to be formed on a first radiator. The second radiating segment of the antenna assembly is part of the gripping area of ​​the frame. The first resonant current of the first resonant mode is at least distributed in the second radiating segment. The second radiating segment is used to form a dielectric loading on the first resonant mode when held. In this way, the peak radiation efficiency of the first resonant mode will shift towards the low-frequency side, and the radiation efficiency of the first frequency band will increase. The first or third radiating segment is set to include a recessed portion. The recessed portion is located inside the overlap area of ​​the frame and spaced apart from the overlap area of ​​the frame. The first resonant current of the first resonant mode is at least distributed in the recessed portion. In this way, the first free end is located inside the frame to avoid the first free end being blocked by the gripping hand, reducing frequency offset and absorption of the horizontal electric field of the first free end by the hand. Alternatively, the strong current return to ground of the first resonant mode is located inside the frame, away from the gripping hand, thereby reducing the absorption of electromagnetic waves radiated by the first resonant mode by the hand, reducing the reduction in radiation efficiency, and improving the antenna performance in handheld scenarios. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0009] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0010] Figure 2 This is a partially exploded structural diagram of an electronic device provided in an embodiment of this application;

[0011] Figure 3 This is a partial rear view of the first antenna assembly in the electronic device provided in the embodiments of this application;

[0012] Figure 4 This is a schematic diagram of the structure of a second antenna assembly for an electronic device provided in an embodiment of this application;

[0013] Figure 5a This is a schematic diagram of a candybar mobile phone held in the left hand according to an embodiment of this application;

[0014] Figure 5b This is a schematic diagram of a right-hand holding scenario for a candybar mobile phone, as provided in an embodiment of this application.

[0015] Figure 6a This is a schematic diagram of a right-hand grip scenario with the hinge facing upwards, as provided in an embodiment of this application;

[0016] Figure 6b This is a schematic diagram of a folding phone held in the left hand with the hinge facing upwards, according to an embodiment of this application.

[0017] Figure 7a This is a schematic diagram of a right-hand grip scenario with the hinge facing down, as provided in an embodiment of this application;

[0018] Figure 7b This is a schematic diagram of a folding phone held in the left hand with the hinge facing down, according to an embodiment of this application.

[0019] Figure 8 This is a structural diagram of the first antenna assembly provided in the embodiments of this application;

[0020] Figure 9 yes Figure 8 The current distribution diagram of the first type of antenna assembly is provided;

[0021] Figure 10 This is an antenna structure diagram provided in an embodiment of this application, where the first free end is located on the frame and not in the recessed portion;

[0022] Figure 11 yes Figure 10 The S-parameters and efficiency curves of the antenna assembly without a recessed section in a folding scenario are provided.

[0023] Figure 12 yes Figure 10 The provided antenna assembly without a recessed section exhibits S-parameters and efficiency curves under folded + free space, left-hand grip, and right-hand grip conditions.

[0024] Figure 13 yes Figure 10 The provided antenna assembly without a recessed section was tested in five scenarios: folded + free space, left hand grip, left hand grip without thumb, left hand grip with only thumb, and left hand grip with only palm. The S-parameters and efficiency curves were obtained.

[0025] Figure 14 This is a structural diagram of the third type of antenna assembly provided in the embodiments of this application;

[0026] Figure 15 This is a structural diagram of the fourth antenna assembly provided in the embodiments of this application;

[0027] Figure 16 This is a structural diagram of the fifth antenna assembly provided in the embodiments of this application;

[0028] Figure 17 This is a current distribution diagram of the fifth type of antenna assembly provided in the embodiments of this application;

[0029] Figure 18 This is a schematic diagram of the structure of the first antenna unit and antenna assembly when the electronic device provided in the embodiments of this application is a foldable electronic device;

[0030] Figure 19 yes Figure 18 A schematic diagram of the structure of the third radiator and the second radiator when the provided electronic device is folded;

[0031] Figure 20 This is a schematic diagram of the structure of the electronic device provided in this application embodiment when it is a foldable electronic device, having a second type of first antenna unit and antenna assembly;

[0032] Figure 21 yes Figure 20 A schematic diagram of the structure of the third radiator, fourth radiator and second radiator of the provided electronic device when folded;

[0033] Figure 22 yes Figure 15 The S-parameters of the provided antenna assembly during switching circuitry.

[0034] Figure 23 yes Figure 15 The radiation efficiency and overall curve of the provided antenna assembly during switching circuitry;

[0035] Figure 24 yes Figure 15 The provided antenna assembly exhibits S-parameters and efficiency curves under the following scenarios when operating in the B28 band: folded + free space, folded + left-hand grip, and folded + right-hand grip.

[0036] Figure 25 yes Figure 15 The provided S-parameters and efficiency curves show that the folding hinge faces downwards and supports the B28 frequency band.

[0037] Figure 26 This is a back view of the electronic device with a sixth type of antenna assembly provided in the embodiments of this application;

[0038] Figure 27 This is a resonant current distribution diagram of the second resonant mode in the sixth antenna assembly provided in this application embodiment;

[0039] Figure 28 This is a resonant current distribution diagram of the first resonant mode in the sixth antenna assembly provided in this application embodiment;

[0040] Figure 29 This is a schematic diagram of the structure of the electronic device provided in this application embodiment having a sixth type of antenna assembly and a first type of second antenna unit;

[0041] Figure 30 This is a schematic diagram of the structure of the electronic device provided in this application embodiment having a sixth type of antenna assembly and a second type of second antenna unit;

[0042] Figure 31This is a schematic diagram of the sixth antenna assembly provided in this application embodiment, which switches to an inductive element and ground via a first switching unit;

[0043] Figure 32 This is a back view of the electronic device with a seventh antenna assembly provided in the embodiments of this application;

[0044] Figure 33 This is a resonant current distribution diagram of the first resonant mode of the seventh antenna assembly provided in this application embodiment;

[0045] Figure 34 This is a resonant current distribution diagram of the second resonant mode of the seventh antenna assembly provided in this application embodiment;

[0046] Figure 35 yes Figure 4 A schematic diagram of the structure of the second type of antenna assembly;

[0047] Figure 36 This is a resonant current distribution diagram of the third resonant mode of the second antenna assembly provided in the embodiments of this application;

[0048] Figure 37 This is a resonant current distribution diagram of the fourth resonant mode of the second antenna assembly provided in the embodiments of this application;

[0049] Figure 38 yes Figure 10 A resonant current distribution diagram is provided on an antenna whose first free end is located on the frame but not on the recessed part;

[0050] Figure 39 yes Figure 10 Another resonant current distribution diagram is provided for the antenna with its first free end located on the frame and not on the sunken part;

[0051] Figure 40 The S-parameters, radiation efficiency, and total efficiency of the antenna with the first free end A located on the frame, operating in the B28 frequency band and in free space;

[0052] Figure 41 The S-parameters, radiation efficiency, and total efficiency of the antenna with the first free end A set on the frame, operating in the B28 band in free space, held with the left hand, and held with the right hand;

[0053] Figure 42 yes Figure 36 The S-parameters and efficiency of the provided antenna assembly;

[0054] Figure 43 yes Figure 36 The S-parameters of the provided antenna assembly are compared with those of the antenna with the first free end A set on the frame in right-hand / left-hand holding scenarios;

[0055] Figure 44 yes Figure 36 A comparison of the radiation efficiency of the provided antenna assembly with that of an antenna with the first free end A located on the frame in right-hand / left-hand holding scenarios;

[0056] Figure 45 yes Figure 36 The overall efficiency of the provided antenna assembly is compared with that of the antenna with the first free end A set on the frame in right-hand / left-hand holding scenarios.

[0057] Explanation of icon numbers:

[0058] Electronic device 1000; antenna assembly 100; display screen 200, middle frame 300 and back cover 400; middle plate 310; frame 320; first main body 10 and second main body 20; top edge 321 and the first side edge 323 and the second side edge 324 of the bottom edge 322; gripping area Z1, overlapping area Z2 and open area Z3; first radiator 11 and first signal source 12; first radiating segment 111, second radiating segment 112 and third radiating segment 113; first free end A; first feed point B; first grounding end C; recessed part 114; extension Extension 115; Second radiator 21; Second ground terminal D and second free terminal E; First sub-side 323a; Second sub-side 323b; First antenna element 30; Third radiator 31 and second signal source 32; Third ground terminal F, second feed point G and third free terminal H; Fourth radiator 41; Fourth ground terminal J and fourth free terminal K; Fifth radiator 51; Fifth free terminal L and fifth ground terminal N; Inductor element L0; Second antenna element 40; Capacitor element C0; First switch unit K1; Fifth radiator 51; Connection point P. Detailed Implementation

[0059] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0060] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0061] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0062] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of this application. The electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablets, laptops, computers, wearable devices, drones, robots, and digital cameras. This embodiment uses a mobile phone as an example for illustration; other electronic devices can refer to this embodiment.

[0063] Please see Figure 2 The electronic device 1000 includes an antenna assembly 100. Taking a mobile phone as an example, the working environment of the antenna assembly 1000 is illustrated. The electronic device 1000 includes a display screen 200, a mid-frame 300, and a back cover 400 arranged sequentially along its thickness. The mid-frame 300 includes a mid-plate 310 and a frame 320 surrounding the mid-plate 310. The frame 320 may be a conductive frame. Of course, in other embodiments, the electronic device 1000 may not have a mid-plate 310. The display screen 200, mid-plate 310, and back cover 400 are stacked sequentially, forming receiving spaces between the display screen 200 and the mid-plate 310, and between the mid-plate 310 and the back cover 400, to accommodate components such as the motherboard, camera module, receiver module, battery, and various sensors. One side of the frame 320 surrounds the edge of the display screen 200, and the other side of the frame 320 surrounds the edge of the back cover 400, forming the complete external structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, while the frame 320 and the back cover 400 can be separate structures. The above describes the working environment of the antenna assembly 100 using a mobile phone as an example, but the antenna assembly 100 of this application is not limited to the above working environment.

[0064] Optionally, the electronic device 1000 is a non-foldable electronic device, such as a candybar mobile phone.

[0065] Optionally, the electronic device 1000 is a foldable electronic device, such as a foldable mobile phone. Specifically, the electronic device 1000 includes a first body 10 and a second body 20. The first body 10 and the second body 20 are movably connected (rotatably connected or slidably connected) to present a folded state or an unfolded state. When the first body 10 and the second body 20 are rotatably connected, the first body 10 and the second body 20 are connected by a pivot, and at least one of the first body 10 and the second body 20 rotates around the pivot. The display screen 200 is a flexible display screen.

[0066] Please see Figure 3 , Figure 3 The image shows the rear view of the electronic device 1000. The frame 320 includes a top edge 321 and a bottom edge 322 oppositely disposed, and a first side edge 323 and a second side edge 324 connecting the top edge 321 and the bottom edge 322. The top edge 321 is the side away from the ground when the user holds and uses the electronic device 1000 in portrait mode, and the bottom edge 322 is the side facing the ground when the user holds and uses the electronic device 1000 in portrait mode. The first side edge 323 is the left side when the user holds and uses the electronic device 1000 in portrait mode. The second side edge 324 is the right side when the user holds and uses the electronic device 1000 in portrait mode. Alternatively, the first side edge 323 can also be the right side when the user holds and uses the electronic device 1000 in portrait mode, and the second side edge 324 can be the left side when the user holds and uses the electronic device 1000 in portrait mode. From a holding perspective, when a user holds and uses the electronic device 1000 in portrait mode, their hand typically grips the first side 323 and the second side 324, with the bottom edge 322 either not gripped or not. The top edge 321 is not gripped, and the distance between the user and the top edge 321 is greater than the distance between the top edge and the bottom edge 322. Taking a mobile phone as an example, the distance between the top edge 321 and the camera module in the electronic device 1000 is greater than the distance between the bottom edge 322 and the camera module in the electronic device 1000.

[0067] Please see Figure 3The frame 320 includes a grip area Z1, an overlapping area Z2, and an open area Z3. The grip area Z1 is held by a hand in a first grip scenario and by the thumb in a second grip scenario. The overlapping area Z2 is overlapped by fingers in a third grip scenario. The open area Z3 is not obstructed by the hand in any of the above-mentioned grip scenarios. The first side 323 and the second side 324 both include the grip area Z1 and the overlapping area Z2. The open area Z3 is located at the bottom edge 322. The first grip scenario includes, but is not limited to, a left-hand grip scenario for a non-foldable electronic device and a left-hand grip scenario with the hinge facing upwards for a foldable phone. The second grip scenario includes, but is not limited to, a left-hand grip scenario with the hinge facing downwards for a foldable phone. The third grip scenario includes, but is not limited to, a right-hand grip scenario with the hinge facing upwards for a foldable phone and a right-hand grip scenario with the hinge facing downwards for a foldable phone.

[0068] Please see Figure 3 and Figure 4 Taking the gripping area Z1 and the overlapping area Z2 located on the first side 323 as an example, the gripping area Z1 is located near the bottom edge 322 of the first side 323. For example, the distance between the gripping area Z1 and the bottom edge 322 on the first side 323 is less than a first preset value. The first preset value ranges from 20 to 40 mm. The gripping area Z1 also includes the area near the bottom edge 322 of the first side 323. For example, the distance between the gripping area Z1 and the bottom edge 323 is less than or equal to a second preset value, which ranges from 10 to 20 mm. The overlapping area Z2 is located on the side of the gripping area Z1 on the first side 323 that is away from the bottom edge 322. The distance between the overlapping area Z2 and the bottom edge 322 is greater than or equal to 20 mm. The open area Z3 is located on the bottom edge 322, and the distance between the open area Z3 and the first side 323 is greater than or equal to a third preset value, which ranges from 10 to 20 mm. The distance between the open area Z3 and the second side 324 is greater than or equal to a third preset value, which is in the range of 10-20mm.

[0069] The following is passed Figures 5a-7b Specific examples are given for the gripping area Z1 and overlapping area Z2 on the first side 323 in various gripping scenarios.

[0070] Please see Figure 5a The first holding scenario is the left-hand holding scenario of a candybar phone. The area near the bottom edge 322 of the first side 323 is the holding area Z1 for hand holding; the area near the middle of the bottom edge 322 is the open area Z3.

[0071] Please see Figure 5bThe third grip scenario is the right-hand grip scenario of a candybar phone. The lower middle part of the first side 323 is the overlapping area Z2 for finger contact; the area near the middle of the bottom edge 322 is the open area Z3.

[0072] Please see Figure 6a The third holding scenario is the right-hand holding scenario with the hinge of the folding phone facing upwards. The lower middle part of the first side 323 is the overlapping area Z2 for finger contact; the area near the middle of the bottom edge 322 is the open area Z3.

[0073] Please see Figure 6b The first holding scenario is the left-hand holding scenario with the hinge of the folding phone facing upwards. The area near the bottom edge 322 of the first side 323 is the holding area Z1 for hand holding; the area near the middle of the bottom edge 322 is the open area Z3.

[0074] Please see Figure 7a The third grip scenario is the right-hand grip scenario with the hinge of the folding phone facing down. The part of the first side 323 near the bottom edge 322 is the grip area Z1 for the thumb grip; the area near the middle of the bottom edge 322 is the open area Z3.

[0075] Please see Figure 7b The second holding scenario is the left-hand holding scenario with the hinge of the folding phone facing down. The lower middle part of the first side 323 is the overlapping area Z2; the area near the middle of the bottom edge 322 is the open area Z3.

[0076] Of course, in other embodiments, the gripping area Z1 and the overlapping area Z2 may also be located on the second side 324, which is mirror-symmetrical to the above-described embodiments.

[0077] It is understandable that due to differences in hand size among different users, the positions of their fingers touching the frame 320 of the electronic device 1000 and their hands holding the same electronic device 1000 with the same gesture will differ. As an example, the overlapping area Z2 and the gripping area Z1 described in this application can be corresponding areas formed when users of any hand size hold the electronic device 1000 with the same gesture. For example, the overlapping area Z2 can be the area where the frame 320 of the electronic device 1000 is touched by the fingers when a user of any hand size holds the electronic device 1000 with the same gesture; the gripping area Z1 can be the area where the frame 320 of the electronic device 1000 is covered by the palm (or thumb) and in contact with the palm (or thumb) when a user of any hand size holds the electronic device 1000 in the same posture.

[0078] The specific structure of the antenna assembly 100 is illustrated below with reference to the accompanying drawings.

[0079] Please see Figure 8 The antenna assembly 100 includes a first radiator 11 and a first signal source 12.

[0080] The first radiator 11 serves as the port for transmitting and receiving radio frequency signals in the antenna assembly 100. The radio frequency signals are transmitted in the air medium as electromagnetic waves. This application does not specifically limit the material of the first radiator 11. Optionally, the first radiator 11 may be made of a conductive material, including but not limited to conductive materials such as metals and alloys.

[0081] This application does not specifically limit the shape of the first radiator 11. For example, the shape of the first radiator 11 includes, but is not limited to, strip, sheet, rod, coating, film, etc. Figure 8 The first radiator 11 shown is merely an example and does not limit the shape of the first radiator 11 provided in this application. In this embodiment, the first radiator 11 is strip-shaped. This application does not limit the extension trajectory of the first radiator 11.

[0082] Optionally, the first radiator 11 may be in the form of, but is not limited to, a metal frame, a metal frame embedded in a plastic frame, a metal radiator 11 located inside or on the surface of the frame 320, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct-formed antenna formed by laser direct forming (LDS), a printed direct-formed antenna formed by printing direct forming (PDS), a conductive sheet antenna (e.g., a metal bracket antenna), etc.

[0083] Please see Figure 9 The first radiator 11 includes a first radiating segment 111, a second radiating segment 112, and a third radiating segment 113 that are interconnected and arranged sequentially. The specific division of the first radiating segment 111, the second radiating segment 112, and the third radiating segment 113 will be illustrated with examples later in this application.

[0084] Please see Figure 9 The end of the first radiating segment 111 furthest from the second radiating segment 112 is designated as the first free end A. The end of the third radiating segment 113 furthest from the second radiating segment 112 is designated as the first grounding end C. The first grounding end C is used for electrical connection to a reference ground. The first free end A is the end disconnected from other conductive materials.

[0085] Please refer to the following: Figure 3 and Figure 8At least a portion of the second radiating segment 112 is the gripping area Z1 of the frame 320. Specifically, a portion of the second radiating segment 112 is the gripping area Z1 on the frame 320, or the entire second radiating segment 112 is the gripping area Z1 on the frame 320. In both the first and second gripping scenarios, the second radiating segment 112 is partially or entirely gripped by the palm or thumb, creating conditions for medium loading.

[0086] Please refer to the following: Figure 8 and Figure 9 The second radiating segment 112 includes a first feed point B. The first signal source 12 is electrically connected to the first feed point B and is used to excite the first radiator 11 to form a first resonant mode supporting the first frequency band. The first resonant current of the first resonant mode is at least distributed in the second radiating segment 112. Further, the first radiator 11 and the first signal source 12 form an IFA antenna. The operating mode of the first resonant mode is a 1 / 4 wavelength mode of the first frequency band. The region where the first feed point B is located is a high current region. Further, the portion of the first resonant current of the first resonant mode on the second radiating segment 112 is a high current. The second radiating segment 112 is used to form a dielectric loading of the first resonant mode under a gripping condition.

[0087] In this embodiment, the efficiency of the second radiating segment 112 after being held to form a dielectric loading on the first resonant mode is greater than the efficiency of the second radiating segment 112 without forming a dielectric loading on the first resonant mode. In other words, the second radiating segment 112 is used to improve efficiency after being held to form a dielectric loading on the first resonant mode.

[0088] The following provides a specific explanation of the dielectric loading formed by the antenna assembly 100 when the electronic device 1000 is held: Since at least a portion of the second radiating segment 112 is the holding area Z1 of the frame 320, and examples of the holding area Z1 in various handheld states have been provided above, by setting the position of the antenna assembly 100, at least a portion of the second radiating segment 112 is positioned within the holding area Z1 on the frame 320. In other words, when the electronic device 1000 is held, the hand contacts the second radiating segment 112. The effective dielectric constant of the hand is relatively large, for example, 25-40, much greater than the dielectric constant 0 in air. Therefore, the hand contacting the second radiating segment 112 effectively changes the radiation environment of the electromagnetic waves radiated by the second radiating segment 112. The hand forms a high dielectric constant medium in the electromagnetic wave radiation space. Based on the principle that the wavelength of electromagnetic waves shortens in a high dielectric constant medium, having a medium (e.g., the hand) cover or surround the radiator can significantly reduce the antenna size in the corresponding frequency band; that is, dielectric loading can achieve miniaturization. In the electronic device 1000, since the length of the second radiating segment 112 is equal before and after being held, the equivalent dielectric constant around the second radiating segment 112 is changed after being held. Since the electrical length of the second radiating segment 112 remains unchanged, according to the wavelength shortening effect, the radiation capability will shift towards the low frequency, that is, the peak radiation efficiency will shift towards the low frequency side.

[0089] The second radiating segment 112 operates in the first resonant mode, generating a strong current. During radiation, this strong current encounters the high dielectric constant medium formed by the hand, causing the peak radiation efficiency in the first resonant mode to shift towards the low-frequency side. Since the radiation efficiency of the first resonant mode gradually increases in the first frequency band and its high-frequency side (i.e., the high-frequency side of the first frequency band has a higher radiation efficiency than the first frequency band itself), the radiation efficiency of the first frequency band increases after the peak radiation efficiency shifts towards the low-frequency side. In other words, the antenna assembly 100 described herein forms a dielectric loading in the hand-held state and the first resonant mode, thereby improving the radiation efficiency in the first resonant mode.

[0090] Generally, when a hand touches the radiator of the antenna assembly 100, the hand absorbs the electromagnetic waves radiated by the radiator. However, in this application, since the area touched by the hand is not the radiation segment where the first free end A is located, and the efficiency improvement brought by the hand's dielectric loading of the antenna assembly 100 is greater than the efficiency reduction brought by the hand's absorption, the overall effect is that the antenna assembly 100 forms dielectric loading in the hand-held state and the first resonant mode, thereby improving the radiation efficiency in the first resonant mode.

[0091] This application does not limit the specific size of the first frequency band. Optionally, the first frequency band may include, but is not limited to, a low frequency band, which is a frequency band less than 1 GHz. Further, the first frequency band is less than or equal to 0.9 GHz. When the first frequency band is less than or equal to 0.9 GHz, the efficiency improvement brought by the dielectric loading of the hand onto the antenna assembly 100 is greater than the efficiency reduction brought by the absorption effect of the hand.

[0092] The following compares the efficiency curves of a set of antenna components 100 with the first frequency band being B28 when the electronic device 1000 is in a folded state, in free space, and in scenarios where it is held with the left hand and the right hand. Figure 10 The provided antenna assembly 100 without a recessed section is an IFA antenna + parasitic antenna type, without a recessed section, so that efficiency can be compared separately for the medium loading formed by the second radiating segment 112 held by the hand or in free space.

[0093] Please see Figure 10 , Figure 10 The arrows in the diagram indicate the operating current distribution of the antenna assembly 100 without a recessed section. The current in the antenna assembly 100 without a recessed section flows from the first ground terminal C to the first free terminal A, and this current is a quarter wavelength current of the B28 frequency band.

[0094] Please see Figure 11 , Figure 11 yes Figure 10 The provided S-parameters and efficiency curves of the antenna assembly 100 without a recessed section in a folded scenario are shown. Curve a represents the S-parameters of the antenna assembly 100 without a recessed section in free space. Curve b represents the radiation efficiency of the antenna assembly 100 without a recessed section in free space. Curve c represents the overall efficiency of the antenna assembly 100 without a recessed section in free space.

[0095] Please see Figure 12 , Figure 12 yes Figure 10 The provided antenna assembly 100 without a recessed section exhibits S-parameters and efficiency curves under folded + free space, left-hand grip, and right-hand grip conditions.

[0096] Among them, the antenna assembly 100 without a recessed section is held in the left and right hands in a folded scenario, as shown below. Figure 6a , Figure 6b As shown, when held in the left hand, the second radiating segment 112 of the antenna assembly 100 without a recessed portion is located in the holding area Z1, and it contacts the left palm. When held in the right hand, the third radiating segment 113 of the antenna assembly 100 without a recessed portion is located in the overlapping area Z2, and the radiating segment on the second radiating segment 112 of the antenna assembly 100 without a recessed portion contacts the right hand fingers.

[0097] Curve a1 represents the S-parameters of the antenna assembly 100 without a recessed section in free space. Curve b1 represents the radiation efficiency of the antenna assembly 100 without a recessed section in free space. Curve c1 represents the overall efficiency of the antenna assembly 100 without a recessed section in free space. Curve a2 represents the S-parameters of the antenna assembly 100 without a recessed section when held in the left hand. Curve b2 represents the radiation efficiency of the antenna assembly 100 without a recessed section when held in the left hand. Curve c2 represents the overall efficiency of the antenna assembly 100 without a recessed section when held in the left hand. Curve a3 represents the S-parameters of the antenna assembly 100 without a recessed section when held in the right hand. Curve b3 represents the radiation efficiency of the antenna assembly 100 without a recessed section when held in the right hand. Curve c3 represents the overall efficiency of the antenna assembly 100 without a recessed section when held in the right hand.

[0098] Comparing curves b1, b2, and b3, it can be seen that the radiation efficiency curve of the antenna assembly 100 without a recessed section when held in the left hand is shifted towards lower frequencies compared to the radiation efficiency curve of the antenna assembly 100 without a recessed section in free space. The radiation efficiency of the antenna assembly 100 without a recessed section when held in the left hand is higher than that when held in free space and with the right hand. This indicates that in the B28 frequency band, the dielectric loading effect of the second radiating segment 112 improves the efficiency of the B38 frequency band.

[0099] Please refer to Table 1-1, which compares the overall efficiency of the antenna assembly 100 without a recessed section under folded + free space, left-hand grip, and right-hand grip conditions. It can be seen that in the left-hand grip scenario, the performance is significantly improved compared to the free space and right-hand grip scenarios. Not only is there no decrease due to the absorption effect of the hand, but a significant improvement is observed in the left-hand grip scenario. In the left-hand grip scenario, the left palm rests against the antenna, and the palm forms a dielectric load on the antenna assembly 100 without a recessed section, causing the peak radiation efficiency on the high-frequency side of the first frequency band to shift towards the low-frequency side. The peak efficiency moves to the location of the first frequency band, thus improving the radiation efficiency of the first frequency band. In contrast, when gripped with the right hand, the right ring finger is closer to the antenna, making it easier to grip the gap, causing a certain frequency offset and efficiency decrease.

[0100] Table 1-1

[0101]

[0102]

[0103] Furthermore, taking the left-hand grip scenario in the B28 band as an example, please refer to... Figure 13 , Figure 13 yes Figure 10The provided antenna assembly 100 without a recessed section was subjected to simulation experiments in five scenarios: folded + free space (a1, a2 curves), left hand grip (b1, b2 curves), left hand grip without thumb (c1, c2 curves), left hand grip with only thumb (d1, d2 curves), and left hand grip with only palm (e1, e2 curves). The S-parameters and efficiency curves were obtained.

[0104] Comparing the radiation efficiency curves a2, b2, c2, d2, and e2, the efficiency in free space (curve a2) is consistent with the efficiency when only the thumb is left in the left-hand grip (curve d2), indicating that the thumb has a small impact on the overall efficiency improvement in the left-hand grip scenario. The efficiency of the left-hand grip (curve b2) is essentially the same as the efficiency of the left-hand grip without the thumb (curve c2), further demonstrating the thumb's small influence. Furthermore, the efficiency curve c2 with the thumb removed is slightly higher than that of the left-hand grip (curve b2), indicating that the thumb primarily absorbs radiation in the left-hand grip scenario. The efficiency of the left-hand grip with only the palm (curve e2) is the highest, with a peak value close to the peak value in the free space scenario. This indicates that the peak efficiency of the grip is low-skewed, with the palm playing a major role and significantly improving efficiency in the B28 band, while the other fingers mainly absorb radiation. Overall, the palm (including all fingers) still provides an improvement effect in the B28 band.

[0105] In this application, the second radiating segment 112 (high current region) of the antenna assembly 100 is located in the gripping area Z1. Further, the second radiating segment 112 (high current region) of the antenna assembly 100 is located in the gripping area Z1 for hand gripping, thereby forming a dielectric loading effect in the second frequency band and improving efficiency. While the second radiating segment 112 of the antenna assembly 100 is located in the gripping area Z1 for left-hand gripping scenarios, the radiating segments near the second radiating segment 112 (the first radiating segment 111 or the third radiating segment 113) are located in the finger gripping scenario for right-hand gripping scenarios. To address the problem of decreased radiation efficiency due to absorption caused by finger gripping of this area, the following improvements have been made.

[0106] The following improvements are made to the first radiation segment 111 and the third radiation segment 113: Please refer to [link / reference needed]. Figure 3 , Figure 4 and Figure 9 At least a portion of the first radiating segment 111 or at least a portion of the third radiating segment 113 is located in the overlap area Z2, and at least one of the first radiators 11 located in the overlap area Z2 includes a recessed portion 114. The recessed portion 114 is disposed inside the frame 320 and spaced apart from the frame 320.

[0107] Optional, please refer to Figure 3 and Figure 9The recessed portion 114 is made of a conductive material. The recessed portion 114 is located inside the frame 320 and can be arranged parallel to and spaced apart from the frame 320. This ensures that when holding the frame 320, the hand will not directly grip the recessed portion 114. Optionally, the recessed portion 114 can be integrally interconnected with the frame 320. The recessed portion 114 and the frame 320 are formed by machining the same conductive plate.

[0108] The first resonant current of the first resonant mode is at least distributed in the lower portion 114.

[0109] In one alternative implementation, please refer to Figure 4 and Figure 14 The sunken portion 114 is located in the first radiation section 111. The first resonant current of the first resonant mode flows from the first ground terminal C of the third radiation section 113 through the second radiation section 112 and the sunken portion 114 to the first free terminal A of the first radiation section 111.

[0110] Furthermore, the recessed portion 114 includes a first free end A. Since the first free end A is adjacent to the insulating gap, and the insulating gap contains a horizontal electric field (parallel to the direction of the first radiating segment 111), this horizontal electric field is essentially absorbed by the hand when it is held. By placing the recessed portion 114 inside the frame 320, the first free end A is positioned inside the frame 320, preventing it from being blocked by the holding hand, reducing frequency offset, and reducing the absorption of the horizontal electric field of the first free end A by the hand, thus ensuring the antenna performance of the antenna assembly 100.

[0111] For the two alternative implementation methods, please refer to Figure 3 and Figure 9 The sunken part 114 is located in the third radiation section 113. The first resonant current of the first resonant mode flows from the first ground terminal C of the third radiation section 113 through the sunken part 114 and the second radiation section 112 to the first free terminal A of the first radiation section 111.

[0112] Since the antenna assembly 100 in this application is an IFA antenna, the area between the first ground terminal C and the first feed point B is a strong current region of the first resonant mode. That is, the recessed portion 114 is a strong current region of the first resonant mode. In this way, by placing the strong current region of the first resonant mode inside the frame 320, away from the holding hand (e.g., away from the fingers when holding with the right hand), the absorption of electromagnetic waves radiated by the hand in the first resonant mode is reduced, thereby reducing the reduction in radiation efficiency.

[0113] This application does not specify the length of the first radiation segment 111, the second radiation segment 112, and the third radiation segment 113.

[0114] The length of the first radiating segment 111 is approximately 1 / 4 to 1 / 3 of the total length of the first radiating body 11.

[0115] Optionally, the length of the second radiating segment 112 is less than 3 / 4 of the total length of the first radiator 11. Further, the length of the second radiating segment 112 is approximately 10mm-40mm, and even further, it is approximately 20mm-35mm, so that when the electronic device 1000 is held in hand, the second radiating segment 112 fully corresponds to and contacts the palm / finger portion, thereby forming a dielectric loading effect and improving the radiation efficiency of the electronic device 1000 in handheld state.

[0116] Optionally, the length of the third radiating segment 113 is less than or equal to the length from the first grounding terminal C to the first feed point B. The length of the third radiating segment 113 is less than or equal to 3 / 4 of the total length.

[0117] Optionally, at least a portion of the current on the third radiating segment 113 is a strong current in the first resonant mode, and at least a portion of the current on the second radiating segment 112 is a strong current in the first resonant mode.

[0118] The area near the first free end A (approximately 1 / 4 of the total length of the first radiator 11) is a weak current segment. The current intensity in the strong current segment is greater than that in the weak current segment. Both the first grounding end C and the first feed point B are strong current points in the first resonant mode. The strong current segment of the first radiator 11 in the first resonant mode is the region from the first grounding end A to a position where the length from the first grounding end A is 3 / 4 of the total length of the first radiator 11.

[0119] This application sets the second radiating segment 112 as part of the gripping area Z1 of the frame 320; the first signal source 12 is electrically connected to the first feed point B to excite the formation of a first resonant mode supporting the first frequency band on the first radiator 11, and the first resonant current of the first resonant mode is at least distributed in the second radiating segment 112. The second radiating segment 112 is used to form a dielectric loading on the first resonant mode under gripping, so that the peak radiation efficiency of the first resonant mode will shift towards the low frequency side, and the radiation efficiency of the first frequency band will increase; the first radiating segment 111 or the third radiating segment 113 is provided with a recessed portion 114, and the recessed portion 114 is located on the... The first resonant current of the first resonant mode is at least distributed in the recessed portion 114, which is located inside the overlapping area Z2 of the frame 320 and spaced apart from the overlapping area Z2 of the frame 320. In this way, the first free end A is located inside the frame 320 to avoid the first free end A being blocked by the holding hand, thereby reducing frequency deviation and absorption of the horizontal electric field of the first free end A by the hand. Alternatively, the strong current return to ground of the first resonant mode is located inside the frame 320, away from the holding hand, thereby reducing the absorption of electromagnetic waves radiated by the first resonant mode by the hand, reducing the reduction in radiation efficiency, and improving the antenna performance of the antenna assembly 100 in the hand-held scenario.

[0120] Through the above design, the antenna assembly 100 can form a dielectric loading effect in the holding area Z1 in scenarios where a candybar phone is held with the left hand, a folding phone is held with the hinge facing upwards, and a folding phone is held with the hinge facing downwards, thereby improving radiation efficiency. In scenarios where a candybar phone is held with the right hand, a folding phone is held with the hinge facing upwards, and a folding phone is held with the hinge facing downwards, a sunken portion 114 is formed in the overlapping area Z2, so that the high current segment on the sunken portion 114 does not directly contact the hand, reducing the absorption effect of the hand, and thus reducing the efficiency reduction in holding scenarios such as holding a candybar phone with the right hand, holding a folding phone with the hinge facing upwards, and holding a folding phone with the hinge facing downwards.

[0121] The electronic device 1000 provided in this application includes, but is not limited to, candybar or foldable types. Generally, the low-frequency antenna on a foldable electronic device 1000 relies more on the auxiliary radiation of a reference ground plane. When the electronic device 1000 is folded, the area of ​​the reference ground plane is halved, resulting in a relative decrease in the radiation performance of the low-frequency antenna. Furthermore, due to absorption and obstruction of the horizontal electric field at the free end during hand-holding scenarios, the performance of the low-frequency antenna is also low. Through the above-described design, this application can improve the performance of the low-frequency antenna when folded, and improve the anti-folding and anti-hand-holding performance of the low-frequency antenna.

[0122] Taking the second radiating segment 112 located in the gripping area Z1 for left-hand gripping and the sunken portion 114 located in the finger gripping area Z1 for right-hand gripping as an example, the above design provided by the embodiments of this application can improve the efficiency of the electronic device 1000 when gripped by the left hand and reduce the efficiency reduction when gripped by the right hand, thereby improving the anti-hand gripping performance of the electronic device 1000.

[0123] Optional, please refer to Figure 9 and Figure 14 The antenna assembly 100 further includes a matching circuit M. The matching circuit M is electrically connected between the first feed point B and the first signal source 12. The matching circuit M is used to adjust the impedance matching between the port of the first signal source 12 and the port of the first radiator 11. The matching circuit M includes at least one of a capacitor and an inductor. Further, the matching circuit M also includes a switch selection circuit, which is used to select devices with different impedances to operate, thereby adjusting the electrical length of the first radiator 11, and thus changing the aperture of the first radiator 11, and adjusting the electrical length of the first radiator 11.

[0124] Matching circuit M includes, but is not limited to, series circuits of capacitors and inductors, parallel circuits of capacitors and inductors, parallel circuits of capacitors and inductors plus a series circuit formed by capacitors, parallel circuits of capacitors and inductors plus a series circuit formed by inductors, series circuits of capacitors and inductors plus a parallel circuit formed by capacitors, series circuits of capacitors and inductors plus a parallel circuit formed by inductors, parallel circuits of capacitors and inductors plus a series circuit formed by capacitors and inductors, and series circuits of capacitors and inductors plus a parallel circuit formed by series circuits of capacitors and inductors.

[0125] Please see Figure 9 The recessed portion 114 is located on the third radiating section 113. The end of the recessed portion 114 away from the second radiating section 112 is the first grounding terminal C. That is, the recessed portion 114 includes the first grounding terminal C. In this embodiment, the antenna assembly 100 is an IFA antenna, and the first grounding terminal C is a high-current return location. By using the first grounding terminal C and the nearby high-current region as the recessed portion 114, the recessed portion 114 is located inside the frame 320 and spaced apart from the frame 320. That is, the high-current region of the first resonant mode is located inside the frame 320, away from the holding hand (e.g., away from the fingers when holding with the right hand), thereby reducing the absorption of electromagnetic waves radiated by the hand in the first resonant mode and reducing the reduction in radiation efficiency. For example, it reduces the absorption of electromagnetic wave signals by the fingers when holding with the right hand, ensuring the performance of the electronic device 1000 when held with the right hand.

[0126] Optionally, the gripping area Z1 is located on the first side 323 near the bottom edge 322. For example, the gripping area Z1 is located at the lower right corner of the electronic device 1000, and the length of the gripping area Z1 on the first side 323 is 20-35mm. The gripping area Z1 is the palm contact area when the left hand is holding the device.

[0127] Please see Figures 5a-6b The frame 320 also includes an open area Z3 adjacent to the gripping area Z1. The open area Z3 is not gripped when the electronic device 1000 is in a gripping state. Optionally, the open area Z3 is located on the bottom edge 322 near the second side edge 324. That is, the open area Z3 can be located on the bottom edge 322 of the electronic device 1000 near the lower right corner.

[0128] In this embodiment, the third radiating segment 113 is located in the grip area Z1 or on the side of the grip area Z1 away from the bottom edge 322. The first radiating segment 111 is located near the lower right corner of the bottom edge 322. The first radiating segment 111 is located on the bottom edge 322 of the electronic device 1000, and the first free end A of the first radiating segment 111 is located in the open area Z3 of the frame 320. Further, the length of the first radiating segment 111 is greater than 10mm, so that the distance between the first free end A and the right side of the electronic device 1000 is greater than 10mm. The first free end A can avoid the gripping position, thereby preventing the first free end A from being covered by the grip and avoiding frequency deviation.

[0129] Of course, in other embodiments, the gripping area Z1 is located on the first side 323 near the bottom edge 322, and the open area Z3 is located on the bottom edge 322 near the first side 323. The first free end A of the first radiating segment 111 is located in the open area Z3 of the frame 320. Further, the length of the first radiating segment 111 is greater than 10mm, so that the distance between the first free end A and the right side of the electronic device 1000 is greater than 10mm, and the first free end A can avoid the gripping position, thereby avoiding the first free end A being covered by gripping and avoiding frequency deviation.

[0130] In one alternative implementation, please refer to Figure 9 The frame 320 is divided into two parts by an insulating gap. One part of the frame 320 serves as the second radiating segment 112, with one end of the second radiating segment bent and connected to the recessed portion 114. The other part of the frame 320 is located on the outer side of the recessed portion 114 and is spaced apart from or insulated from the recessed portion 114.

[0131] In another implementation, please refer to Figure 15The third radiating segment 113 further includes an extension 115 arranged side-by-side with the recessed portion 114. The extension 115 is part of the gripping area Z1 of the frame 320. One end of the extension 115 and one end of the recessed portion 114 are both connected to the end of the second radiating segment 112 away from the first radiating segment 111. The other end of the extension 115 is bent and connected to the recessed portion 114. This application does not limit the position where the other end of the extension 115 is connected to the recessed portion 114. Optionally, the other end of the extension 115 may be connected to the first grounding terminal C of the recessed portion 114 or near the first grounding terminal C; or, the other end of the extension 115 may be connected to the middle position of the recessed portion 114; or, the other end of the extension 115 may be connected to the position of the recessed portion 114 near the second radiating segment 112.

[0132] The extension 115 and the recessed portion 114 surround and form a hollow area, that is, the extension 115 and the recessed portion 114 form a ring structure.

[0133] Please see Figure 15 The first resonant current of the first resonant mode flows from the first ground terminal C through two paths: the recessed portion 114 and the extension portion 115, to the first free terminal A. The recessed portion 114 shares the current of the extension portion 115, thus reducing the current intensity of the extension portion 115 compared to when the recessed portion 114 is not present. This allows part of the resonant current to be kept away from the fingers, reducing the absorption effect when the fingers grip the third radiating segment 113. Furthermore, the extension portion 115 and the recessed portion 114 form a ring, preventing the first resonant current of the first resonant mode from flowing from the first ground terminal C through the recessed portion 114 to the extension portion 115, and avoiding the generation of clutter that could affect the first resonant mode or other resonant modes, thereby affecting the antenna radiation performance.

[0134] The antenna assembly 100 in this embodiment is an IFA antenna. The electrical length of the first radiator 11 is close to 1 / 4 wavelength of the first frequency band. The first resonant mode is a 1 / 4 wavelength mode resonating from the first ground terminal C to the first free terminal A. The 1 / 4 wavelength mode is the ground mode of the IFA antenna. At this time, the antenna assembly 100 has high radiation efficiency in the first frequency band.

[0135] The electrical length described in this application can satisfy the following formula:

[0136]

[0137] 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.

[0138] Please see Figure 16 The antenna assembly 100 also includes a second radiator 21.

[0139] Please see Figure 16 and Figure 17 The second radiator 21 includes a second grounding terminal D and a second free terminal E. The second grounding terminal D is electrically connected to a reference ground, and the second free terminal E is an end that is disconnected from other conductive structures.

[0140] Please see Figure 16 and Figure 17 The second radiator 21 is part of the frame 320. The second free end E is spaced apart from the first radiator 11. The second grounding end D is located on the side of the second free end E away from the first radiator 11. At least a portion of the recessed portion 114 is located inside the second radiator 21 and spaced apart from the second radiator 21.

[0141] Optionally, when the extension 115 is not provided, the second free end E and the second radiating segment 112 are connected to the end of the recessed portion 114 by a gap. The second radiator 21 is provided on the outside of the entire recessed portion 114, and the second radiator 21 is parallel to and spaced apart from the recessed portion 114. The second grounding end D is located on the side of the first grounding end C away from the second radiating segment 112.

[0142] Optional, please refer to Figure 16 and Figure 17 When the extension 115 is provided, the second free end E is connected to the end of the recessed portion 114 by a gap. The second radiator 21 is provided on the outside of a portion of the recessed portion 114, and the second radiator 21 is parallel to and spaced apart from the recessed portion 114. The second grounding end D is located on the side of the first grounding end C away from the second radiating segment 112.

[0143] In an embodiment where the sunken portion 114 is disposed on the first radiating section 111 and the sunken portion 114 includes a first free end A, the second radiator 21 may be disposed on the outside of the first free end A of the sunken portion 114.

[0144] In this embodiment, the second radiator 21 is located on the outer side of the recessed portion 114, which can reduce the absorption of electromagnetic waves radiated by the fingers in the first resonant mode, thereby reducing the absorption of electromagnetic waves by the fingers when holding the finger with the right hand, reducing the reduction in radiation efficiency in the right-hand holding scenario, or ensuring that the radiation efficiency does not decrease in the right-hand holding scenario. Since the second radiator 21 is grounded, when the fingers touch the second radiator 21, static electricity on the fingers can be conducted away, reducing the influence of static electricity on the fingers.

[0145] In the first implementation, please refer to Figure 5a and Figure 5b Electronic device 1000 is a candybar phone, that is, a non-foldable electronic device.

[0146] In the second implementation method, please refer to Figure 6a and Figure 6b The electronic device 1000 is a foldable electronic device.

[0147] Please see Figure 18 The electronic device 1000 includes a first body 10 and a second body 20 that are foldable relative to each other. The first body 10 and the second body 20 are movably connected (rotatably connected or slidably connected) to present a folded state or an unfolded state.

[0148] The antenna assembly 100 is disposed on the second main body 20 (corresponding to the lower half in this application).

[0149] Please see Figure 18 Taking the first main body 10 and the second main body 20 as an example of being rotatably connected by a rotating shaft, the part of the first side 323 located on the first main body 10 is the first sub-side 323a, and the part of the second side 324 located on the second main body 20 is the second sub-side 323b.

[0150] A portion of the radiators of the antenna assembly 100 is located at the bottom edge 322, and another portion of the radiators is located at the second sub-side 323b near the bottom edge 322. The second radiator 21 is located at the second sub-side 323b near the pivot.

[0151] Please see Figure 18 The first main body 10 also includes a first antenna element 30. The first antenna element 30 is disposed on the first main body 10. Further, the radiator of the first antenna element 30 is disposed on the first sub-side 323a.

[0152] When folded, the second radiator 21 is opposite to the radiator of the first antenna unit 30. The second radiator 21 is also used to couple with the first antenna unit 30 on the first body 10 when the electronic device 1000 is folded. That is, when the electronic device 1000 is folded, the second radiator 21 acts as a parasitic branch of the first antenna unit 30 on the first body 10. This allows the second radiator 21 to reduce the absorption of electromagnetic waves radiated by the finger in the first resonant mode, and also to act as a parasitic branch of the first antenna unit 30 on the first body 10 when the electronic device 1000 is folded, thereby improving the radiation performance of the first antenna unit 30 when folded.

[0153] This application does not impose specific limitations on the first antenna element 30. The structure of the first antenna element 30 will be specifically illustrated below with reference to the accompanying drawings.

[0154] In one alternative implementation, please refer to Figure 18The first antenna element 30 includes a third radiator 31 and a second signal source 32. The third radiator 31 includes a third ground terminal F, a second feed point G, and a third free terminal H arranged sequentially. The third ground terminal F is electrically connected to a reference ground plane. The third free terminal H is insulated from other conductive structures.

[0155] Please see Figure 18 The second power supply point G is electrically connected to the second signal source 32.

[0156] The third radiator 31 is located on the first sub-side 323a near the pivot. In the folded state, the third radiator 31 and the second radiator 21 are opposite to and coupled to each other when the electronic device 1000 is folded. Furthermore, the direction of the third ground terminal F pointing to the third free terminal H is opposite to the direction of the second ground terminal D pointing to the second free terminal E.

[0157] Please see Figure 19 In the folded state, the orthographic projection of the third free end H in the thickness direction of the electronic device 1000 is located on the second radiator 21, and the orthographic projection of the second free end E in the thickness direction of the foldable electronic device is located on the third radiator 31.

[0158] Further, please refer to Figure 19 The orthographic projection of the third free end H in the thickness direction of the electronic device 1000 is located between the second free end E and the second ground end D, and the orthographic projection of the second free end E in the thickness direction of the foldable electronic device is located between the third ground end F and the third free end H.

[0159] Optionally, the relative length between the second radiator 21 and the third radiator 31 is approximately half the length of the second radiator 21. Further, the relative length between the second radiator 21 and the third radiator 31 is (1 / 2-1) times the length of the second radiator 21.

[0160] The second signal source 32 is used to excite the third radiator 31 and the second radiator 21 to form a resonant mode when the electronic device 1000 is folded. The frequency bands supported by this resonant mode include, but are not limited to, the LB band, the MHB band, the UHB band, the Wi-Fi 2.4G band, the Wi-Fi 5G band, and the GPS band. This embodiment takes the MHB band as an example.

[0161] The third radiator 31 and the second signal source 32 form an IFA antenna, and the electrical length between the third ground terminal F and the third free terminal H is close to 1 / 4 wavelength of the MHB band. When the electronic device 1000 is in the deployed state, the second signal source 32 excites the area between the third ground terminal F and the third free terminal H to form a 1 / 4 wavelength mode supporting the MHB band.

[0162] Specifically, when the electronic device 1000 is in a folded state, the second signal source 32 excites the third radiator 31 and the second radiator 21 to form a dual resonance supporting the MHB frequency band. The resonant mode on the third radiator 31 is the main radiating mode, and the resonant mode on the second radiator 21 is used to improve the efficiency of the main radiating mode of the third radiator 31.

[0163] For further optional implementations, please refer to Figure 20 The first antenna element 30 further includes a fourth radiator 41. The fourth radiator 41 includes a fourth ground terminal J and a fourth free terminal K. A first coupling gap exists between the fourth free terminal K and the third free terminal H. The fourth radiator 41 is disposed on the first sub-side 323a. The fourth radiator 41 and the third radiator 31 form a port-to-port antenna.

[0164] Please see Figure 21 The fourth radiator 41 is opposite to the second radiator 21 when the electronic device 1000 is folded; that is, when the electronic device 1000 is folded, a portion of the second radiator 21 is opposite to the third radiator 31, and another portion is opposite to the fourth radiator 41. The second signal source 32 is used to excite the second radiator 21, the third radiator 31, and the fourth radiator 41 to form a resonant mode when the electronic device 1000 is folded.

[0165] Please see Figure 20 When the electronic device 1000 is in the deployed state, the second signal source 32 excites the third radiator 31 and the fourth radiator 41 to form dual resonances supporting the MHB frequency band. The resonant mode on the third radiator 31 is the main radiating mode, and the resonant mode on the fourth radiator 41 is used to improve the efficiency of the main radiating mode of the third radiator 31.

[0166] Please see Figure 21 In the folded state, the second radiator 21 and the fourth radiator 41 are parasitic branches of the third radiator 31. The reverse currents on the second radiator 21 and the fourth radiator 41 can cancel each other out, so as to reduce the influence of the reverse currents generated by the second radiator 21 and the fourth radiator 41 on the radiation energy of the third radiator 31 and improve the radiation efficiency of the third radiator 31.

[0167] Generally, when the electronic device 1000 is folded, the contribution of the longitudinal current from the reference ground to the radiation efficiency is greatly reduced due to the halving of the reference ground, resulting in a significant decrease in antenna efficiency. Furthermore, issues such as absorption of electromagnetic waves by the hand and frequency offset caused by the hand covering the free end lead to a significant performance degradation after folding. This application reduces the absorption of electromagnetic waves by the hand through the design of the recessed portion 114. Subsequently, frequency offset is avoided through the design of the free end's position. The second radiating segment 112 is designed to be located in the grip area Z1 for hand gripping or thumb gripping in common handheld scenarios, forming a dielectric loading effect to improve the radiation efficiency of the low-frequency antenna of the electronic device 1000 after folding, thus satisfying the anti-folding and anti-hand grip performance of the low-frequency antenna. By designing the second radiator 21 to form a parasitic radiator of the third radiator 31 after folding, the performance of the mid-to-high frequency antenna after folding is further improved, ensuring that the mid-to-high frequency antenna of the electronic device 1000 has good performance after folding.

[0168] Referring to the accompanying drawings, the third radiating segment 113, the second radiating segment 112, and the second radiator 21 are disposed on the second sub-side 323b of the foldable electronic device. The first radiator 11 operates in the LB band. The second radiator 21 is used to improve the MHB performance of the first antenna element 30 in the folded configuration. There is a gap between the second radiator 21 and the second radiating segment 112. The first radiator 11 and the first signal source 12 form an LB IFA antenna. The first signal source 12 returns to ground via the first grounding terminal C through the recessed portion 114. The first grounding terminal C is located to the left of the second radiator 21, i.e., inside the second radiator 21. At the same time, the end of the extension portion 115 is connected to the recessed portion 114. This avoids the formation of the pattern of first grounding terminal C-recessed portion 114-extension portion 115 to the gap, which would affect the folded mid-high frequency antenna. In addition, the resonant current will form two current paths. The recessed portion 114 acts as a current shunt, and the current amplitude on the extension portion 115 is shunt. The lower current path on the recessed portion 114 is resistant to hand grip, and the upper current radiation on the extension portion 115 is weakened. Overall, less is absorbed by the fingers, thereby reducing the absorption of electromagnetic waves by the fingers in the second grip scenario, reducing the hand grip impact of the electronic device 1000 in the right-hand grip scenario, ensuring right-hand grip efficiency, and realizing the anti-hand grip performance of the electronic device 1000.

[0169] This application does not specifically limit the position of the second grounding terminal D. Optionally, the second grounding terminal D can be arranged adjacent to the first grounding terminal C, so that more recessed portions 114 are arranged inside the second radiator 21. This application does not specifically limit the length of the recessed portion 114. Optionally, the position of the recessed portion 114 connected to the second radiating section 112 can be close to the first feed point B, that is, the distance from the first feed point B to the first grounding terminal C can all be set as recessed portions 114. Optionally, the positions of the two ends of the extension 115 are determined by the position of one end of the recessed portion 114 and the position of the second free end E of the second radiator 21.

[0170] In this embodiment, the first free end A is located in the open region Z3. The first free end A is far away from the human hand and cannot be held by the hand, reducing the possibility of the hand gripping the gap. The first grounding end C is located on the recessed part 114. Since the recessed part 114 is located inside the second radiator 21, the human hand cannot directly grasp the high current return to ground position (i.e., the first grounding end C), further reducing the influence of the hand gripping. The left hand holds the second radiating section 112 (high current region) near the first feed point B, realizing the performance improvement of dielectric loading.

[0171] At this time, when the first radiator 11 is working, the current path is mainly: after the first ground terminal C passes through the parallel circuit of the sinking part 114 and the extension part 115, it passes through the second radiation section 112 to the quarter-wavelength mode of the IFA antenna of the first free end A.

[0172] Furthermore, the low-frequency sub-bands supported by the first radiator 11 can be switched by a switching circuit. This switching circuit can be located in the matching circuit M or electrically connected between the first free end A and the first feed point B. The switching circuit is used to change the electrical length of the first radiator 11, thereby switching the low-frequency sub-bands supported by the first radiator 11.

[0173] Please see Figure 22 , Figure 22 yes Figure 15 The provided antenna assembly 100 exhibits S-parameters during switching circuit operation. Curve a represents the S-parameters of antenna assembly 100 when switching to band B28. Curve b represents the S-parameters when switching to band B5. Curve c represents the S-parameters when switching to band B8. As shown in the figures, antenna assembly 100 can switch between bands B28, B5, and B8 via the switching circuit. Furthermore, by designing the impedance of the switching circuit, switching between 0.7 GHz and 1 GHz can be achieved.

[0174] Please see Figure 23 , Figure 23 yes Figure 15The provided antenna assembly 100 exhibits radiation efficiency and overall efficiency curves during switching circuit transitions. Curve a1 represents the radiation efficiency of antenna assembly 100 when switched to band B5. Curve b1 represents the radiation efficiency when switched to band B8. Curve c1 represents the radiation efficiency when switched to band B28. Curve a2 represents the overall efficiency of antenna assembly 100 when switched to band B5. Curve b2 represents the overall efficiency when switched to band B8. Curve c2 represents the overall efficiency when switched to band B28. As shown in the figures, antenna assembly 100 exhibits good efficiency when switched to bands B28, B5, and B8 via the switching circuit.

[0175] Please see Figure 24 , Figure 24 yes Figure 15 The provided antenna assembly 100 operates in the B28 band and displays its S-parameters and efficiency curves under the following scenarios: folded + free space, folded + left-hand grip, and folded + right-hand grip.

[0176] Curve a1 represents the S-parameters of antenna assembly 100 in folded + free space; curve b1 represents the S-parameters of antenna assembly 100 in folded + left-hand grip; curve c1 represents the S-parameters of antenna assembly 100 in folded + right-hand grip.

[0177] Curve a2 represents the radiation efficiency of antenna assembly 100 in folded + free space; curve b2 represents the radiation efficiency of antenna assembly 100 in folded + left-hand holding; curve c2 represents the radiation efficiency of antenna assembly 100 in folded + right-hand holding.

[0178] Curve a3 represents the total efficiency of antenna assembly 100 in folded + free space; curve b3 represents the total efficiency of antenna assembly 100 in folded + left-hand holding; curve c3 represents the total efficiency of antenna assembly 100 in folded + right-hand holding.

[0179] Curves a1, b1, and c1 illustrate that the antenna assembly 100 can operate in the B28 band in scenarios of folding + free space, folding + left-hand holding, and folding + right-hand holding. In the left-hand holding and right-hand holding scenarios, there is basically no frequency offset. This is because in this embodiment, the first free end A is located in the open region Z3.

[0180] Curves a2 and b2 illustrate that the efficiency curve of antenna assembly 100 in the folded + left-hand grip scenario shifts towards lower frequencies compared to the efficiency curve in the folded + free space scenario. Furthermore, the radiation efficiency of antenna assembly 100 plateaus after reaching a certain level, indicating that the first radiator 11 still possesses a suitable radiation length and a certain radiation capability beyond the B28 band. This is because the strong current segment of the first radiator 11, due to hand contact, increases the dielectric constant of the electromagnetic waves radiated by the first radiator 11, while the physical length of the first radiator 11 remains unchanged. According to the wavelength shortening effect, the peak efficiency shifts to a lower frequency. The increase in dielectric constant caused by the hand contributes to the efficiency increase through dielectric loading. Dielectric loading achieves an earlier peak radiation efficiency and bandwidth expansion, resulting in a 4dB efficiency improvement.

[0181] In the folding + right-hand grip scenario, the high current area is moved away from the finger by the sunken part 114, reducing the absorption by the finger. The first free end A is set in the open area Z3 to be away from the finger, avoiding the finger gripping the gap. At this time, there is almost no frequency deviation and the efficiency is basically not reduced.

[0182] As can be seen from curves a2 and b2, in the frequency band below 0.9 GHz, the antenna component 100 has relatively good efficiency in the folded + left-hand holding scenario.

[0183] Please refer to Table 1-2, which compares the overall efficiency of the antenna assembly 100 provided in this embodiment in the B28 band under folded + free space, folded + left-hand holding, and folded + right-hand holding conditions. It can be seen that, compared to the antenna assembly 100 without the recessed portion 114 in Table 1-1, the antenna assembly 100 in this embodiment with the recessed portion 114 not only improves efficiency in the folded + free space scenario, but also shows a significant improvement in efficiency under folded + left-hand holding conditions compared to folded + free space. Furthermore, the antenna assembly 100 with the recessed portion 114 also shows improved efficiency under folded + right-hand holding conditions compared to the antenna assembly 100 without the recessed portion 114. Therefore, the antenna assembly 100 provided in this embodiment shows improved efficiency in the B28 band under folded + free space, folded + left-hand holding, and folded + right-hand holding conditions.

[0184] Table 1-2

[0185]

[0186] This embodiment of the application reduces frequency offset and improves efficiency by avoiding the first free end A and the first grounding end C (with high current return to ground) from the hand-held area. Furthermore, holding the hand on the second radiating segment 112 between the first free end A and the first grounding end C creates a dielectric loading effect, further enhancing efficiency.

[0187] The above embodiments are implementations where the hinge faces upwards when folded. Please refer to [link / reference]. Figure 25 , Figure 25 yes Figure 15 The provided S-parameters and efficiency curves show that the folding hinge faces downwards and supports the B28 frequency band.

[0188] Curve a1 represents the S-parameters of antenna assembly 100 in folded + free space; curve b1 represents the S-parameters of antenna assembly 100 in folded + left-hand grip; curve c1 represents the S-parameters of antenna assembly 100 in folded + right-hand grip.

[0189] Curve a2 represents the radiation efficiency of antenna assembly 100 in folded + free space; curve b2 represents the radiation efficiency of antenna assembly 100 in folded + left-hand holding; curve c2 represents the radiation efficiency of antenna assembly 100 in folded + right-hand holding.

[0190] Curve a3 represents the total efficiency of antenna assembly 100 in folded + free space; curve b3 represents the total efficiency of antenna assembly 100 in folded + left-hand holding; curve c3 represents the total efficiency of antenna assembly 100 in folded + right-hand holding.

[0191] As can be seen from curves b1 and c1, in the scenario where the folding hinge is facing down, the bandwidth of both left-hand and right-hand grip will be expanded and the bandwidth will be similar.

[0192] Please refer to Table 1-3, which compares the overall efficiency of the antenna assembly 100 provided in this embodiment with the folded hinge facing downwards in the B28 band under folding + free space, folding + left-hand grip, and folding + right-hand grip scenarios. It can be seen that compared to the performance under the folded hinge facing upwards grip scenario, the efficiency under the folded hinge facing downwards grip scenario is more balanced and has smaller differences. Furthermore, since the second radiating segment 112 is located in the gripping area Z1 used for gripping with the right thumb in the second grip scenario, the thumb contacts a larger area of ​​the second radiating segment 112, and the dielectric loading effect of the thumb is greater than the absorption effect, thus improving the right-hand radiation efficiency.

[0193] Table 1-3

[0194]

[0195] In other embodiments, the present application may also include embodiments without the second radiator 21.

[0196] Please see Figure 26 Based on the aforementioned embodiment where the third radiating section 113 is provided with a recessed portion 114, the antenna assembly 100 further includes a fifth radiator 51.

[0197] Please see Figure 26The fifth radiator 51 is located on the side of the first radiating segment 111 away from the second radiating segment 112. The fifth radiator 51 is coupled to the first radiator 11. The first signal source 12 is also used to excite the fifth radiator 51 to form a second resonant mode supporting the second frequency band. The first resonant mode and the second resonant mode form a dual-wave resonance. The center frequency of the second frequency band is smaller than the center frequency of the first frequency band.

[0198] For details, please refer to Figure 26 The fifth radiator 51 includes a fifth free end L and a fifth ground end N. A second coupling gap exists between the fifth ground end N and the first free end A. The fifth free end L is located on the side of the fifth ground end N opposite to the first free end A.

[0199] In this embodiment, the first radiator 11 and the fifth radiator 51 form an EH mode antenna.

[0200] Please see Figure 27 , Figure 27 This is a resonant current distribution diagram of the second resonant mode in the antenna assembly 100 provided in this application embodiment. The second resonant mode resonates between the fifth ground terminal N and the fifth free terminal L. The second resonant mode is a 1 / 4 wavelength mode of the second frequency band.

[0201] Please see Figure 28 , Figure 28 This is a resonant current distribution diagram of the first resonant mode in the antenna assembly 100 provided in this application embodiment. The first resonant mode resonates between the first ground terminal C and the first free terminal A. The first resonant mode is a 1 / 4 wavelength mode of the first frequency band.

[0202] By designing the electrical length between the fifth ground terminal N and the fifth free terminal L to be greater than the electrical length of the first radiator 11, the resonant frequency of the second resonant mode is made smaller than that of the first resonant mode, and the difference between the resonant frequency of the second resonant mode and that of the first resonant mode is less than 1 GHz. The second resonant mode forms an efficiency convex hull on the high-frequency side of the second frequency band, and the first frequency band is located on the high-frequency side of the second frequency band. In this way, the second resonant mode improves the efficiency of the first frequency band and increases the efficiency bandwidth.

[0203] Optionally, both the second and first frequency bands are low frequencies. The fifth radiator 51 is used to improve the radiation efficiency and efficiency bandwidth of the antenna assembly 100 at low frequencies.

[0204] In one alternative embodiment, the physical length of the fifth radiator 51 is greater than the physical length of the first radiator 11, such that the electrical length between the fifth ground terminal N and the fifth free terminal L is greater than the electrical length of the first radiator 11.

[0205] In another alternative embodiment, the physical length of the fifth radiator 51 is less than the physical length of the first radiator 11.

[0206] Please see Figure 26 The antenna assembly 100 further includes an inductor L0. One end of the inductor L0 is electrically connected to the fifth ground terminal N, and the other end of the inductor L0 is grounded. The inductor L0 is used to increase the electrical length of the fifth radiator 51, such that when the physical length of the fifth radiator 51 is less than the physical length of the first radiator 11, the electrical length of the fifth radiator 51 is greater than the electrical length of the first radiator 11, thereby shortening the total length of the first radiator 11 and the fifth radiator 51.

[0207] Optionally, the inductor L0 includes an inductor, wherein the inductor L0 is a large inductor, for example, greater than or equal to 20nH.

[0208] Please see Figure 29 and Figure 30 The electronic device 1000 is a foldable electronic device. The electronic device 1000 includes a first main body 10 and a second main body 20 that can be folded relative to each other.

[0209] The antenna assembly 100 is disposed on the second main body 20. Specifically, the third radiating segment 113 and the second radiating segment 112 of the first radiator 11 are disposed on the second sub-side 323b, and the third radiating segment 113 is disposed on the bottom edge 322. The fifth radiator 51 is disposed on the bottom edge 322.

[0210] Please see Figure 29 and Figure 30 The first main body 10 includes a second antenna unit 40 supporting the MHB band. Further, the second antenna unit 40 is located at the top edge 321.

[0211] The fifth radiator 51 is also used to couple with the radiator of the second antenna unit 40 on the first body 10 when the electronic device 1000 is folded.

[0212] The second antenna element 40 is an IFA antenna or a port-to-port antenna. The specific structure of the second antenna element 40 can be referenced from the first antenna element 30. The coupling method, position distribution, and resonance mode between the second antenna element 40 and the fifth radiator 51 can be referenced from the coupling method, position distribution, and resonance mode between the first antenna element 30 and the second radiator 21.

[0213] Please see Figure 29 and Figure 30The antenna assembly 100 further includes a capacitor element C0. One end of the capacitor element C0 is electrically connected to the fifth ground terminal N, and the other end of the capacitor element C0 is grounded. The capacitor element C0 includes, but is not limited to, a small capacitor, for example, less than 2pF.

[0214] In this circuit, capacitor C0 and inductor L0 form a parallel circuit. Inductor L0 is used to conduct the first frequency band and the second frequency band, and to block the MHB frequency band. Capacitor C0 is used to conduct the MHB frequency band and to block the first frequency band and the second frequency band.

[0215] In the deployed state, the first signal source 12 excites the first radiator 11 and the fifth radiator 51 to form a double resonance supporting the first frequency band and the second frequency band. The resonant current on the fifth radiator 51 is mainly grounded through the inductor L0, and the capacitor C0 is equivalent to an open circuit for the resonant current of the first frequency band and the second frequency band.

[0216] In the folded state, the fifth radiator 51 acts as a parasitic stub of the second antenna unit 40. The resonant current supporting the MHB band generated by the excitation of the second antenna unit 40 is mainly grounded through the capacitor element C0, and the inductor element L0 is equivalent to an open circuit for the MHB band.

[0217] As described above, in the unfolded state, the fifth radiator 51 supports the LB band current, and in the folded state, the fifth radiator 51 supports the MHB band, and there is no interference between them.

[0218] In another alternative implementation, please refer to Figure 31 The antenna assembly 100 further includes a first switching unit K1. One end of the first switching unit K1 is electrically connected to the fifth ground terminal N, and the other end of the first switching unit K1 can be selectively electrically connected to one end of the inductor L0 or grounded.

[0219] The first switching unit K1 is used to switch to ground when the electronic device 1000 is folded, and to switch to electrically connect to the inductor L0 when the electronic device 1000 is unfolded. The inductor L0 is a large inductance, for example, greater than or equal to 20nH.

[0220] In this embodiment, the first switching unit K1 switches to ground when the electronic device 1000 is folded, and switches to electrically connect to the inductor L0 when the electronic device 1000 is unfolded, so that the fifth radiator 51 supports LB band current in the unfolded state and supports MHB band in the folded state, and there is no interference between them.

[0221] This application does not impose a specific limit on the number of LB antennas and MHB antennas mentioned above. Optionally, there can be multiple LB antennas and MHB antennas to achieve intelligent switching.

[0222] Based on the anti-folding and anti-hand grip LB antenna, this application embodiment can add a fifth radiator 51 as an MHB parasitic stub to simultaneously improve the performance of the MHB and LB bands; by adding a switching unit and a grounded large inductor, or by setting a parallel circuit of a grounded large inductor and a grounded small capacitor, the LB performance can be improved, increasing the LB band's folding + free space / folding + left-hand grip / folding + right-hand grip performance by 0.5-1dB.

[0223] Based on the aforementioned embodiment where the third radiating section 113 is provided with a recessed portion 114, please refer to... Figure 32 The antenna assembly 100 further includes a fifth radiator 51. The fifth radiator 51 is located on the side of the first radiating segment 111 away from the second radiating segment 112. The fifth radiator 51 is coupled to the first radiator 11. The first signal source 12 is also used to excite the fifth radiator 51 to form a second resonant mode supporting a second frequency band. The first resonant mode and the second resonant mode form a dual-wave resonance. The center frequency of the second frequency band is lower than the center frequency of the first frequency band.

[0224] The difference between this embodiment and the previous one is that a third coupling gap is formed between the fifth free end L and the first free end A. The fifth grounding end N is located on the side of the fifth free end L that is away from the first free end A.

[0225] In this embodiment, the first radiator 11 and the fifth radiator 51 form an EE mode antenna.

[0226] The electrical length of the fifth radiator 51 is less than that of the first radiator 11, making the resonant frequency of the second resonant mode greater than that of the first resonant mode, and the difference between the resonant frequency of the second resonant mode and that of the first resonant mode is less than 1 GHz. The second resonant mode forms an efficiency convex hull on the low-frequency side of the second frequency band, and the first frequency band is located on the low-frequency side of the second frequency band. Thus, the second resonant mode improves the efficiency of the first frequency band and increases the efficiency bandwidth.

[0227] A portion of the fifth radiator 51 is located at the bottom edge 322, and another portion of the fifth radiator 51 is located at the second side edge 324.

[0228] Please see Figure 33 , Figure 33 yes Figure 32The provided antenna assembly 100 shows the resonant current distribution of the first resonant mode. The first resonant mode also forms a second resonant current on the fifth radiator 51. Specifically, the first resonant mode includes a primary resonant current operating in a 1 / 4 wavelength mode on the first radiator 11, and also includes a secondary resonant current formed on the fifth radiator 51, wherein the direction of the second resonant current (secondary resonant current) is the same as the direction of the first resonant current (primary resonant current) on the first radiator 11.

[0229] Please see Figure 34 , Figure 34 yes Figure 32 The provided antenna assembly 100 shows the resonant current distribution of the second resonant mode. The second resonant mode also forms a third resonant current on the first radiator 11. Specifically, the second resonant mode includes a primary resonant current in a 1 / 4 wavelength mode operating on the fifth radiator 51, and also includes a secondary resonant current formed on the first radiator 11. The resonant current (primary resonant current) of the second resonant mode on the fifth radiator 51 is in the opposite direction to the third resonant current (secondary resonant current).

[0230] In short, the first signal source 12 excites the first radiator 11 and the fifth radiator 51 to jointly generate a resonant current in the first resonant mode. The currents in the first resonant mode on the first radiator 11 and the fifth radiator 51 are in the same direction, and the resonant current of the first resonant mode forms a current loop with the ground current on the reference ground. The first resonant mode is also called the radiation mode. The radiation mode is a mode that depends on the reference ground. Simultaneously, the first signal source 12 also excites the first radiator 11 and the fifth radiator 51 to generate a resonant current in the second resonant mode. The currents in the second resonant mode on the first radiator 11 and the fifth radiator 51 are in opposite directions. The second resonant mode is also called the balanced mode. The balanced mode, relatively speaking, is a mode that does not depend on the reference ground.

[0231] When the frequency band supported by the balanced mode is located on the high-frequency side of the frequency band supported by the radiating mode, and the frequency band supported by the balanced mode is close to the frequency band supported by the radiating mode, the balanced mode can produce an efficiency enhancement effect (from the efficiency curve, the balanced mode can form an efficiency convex hull on the high-frequency side of the frequency band where the radiating mode is located), thereby improving the in-band efficiency of the radiating mode, that is, improving the in-band efficiency of the first frequency band.

[0232] This application embodiment improves the LB antenna performance by setting a fifth radiator 51, which forms an EE mode mouth-to-mouth antenna with the LB antenna. The performance improvement can reach 1-2d.

[0233] Please see Figure 4The recessed portion 114 is located on the first radiating segment 111. The end of the recessed portion 114 away from the second radiating segment 112 is the first free end A. In other words, the first free end A and the surrounding portion constitute the recessed portion 114, which is located away from the frame 320 where the human hand holds the object, thereby reducing the absorption of the horizontal electric field at the first free end A by the hand and reducing frequency deviation.

[0234] In this embodiment, the resonant mode on the antenna assembly 100 is the same as the resonant mode on the first resonant mode in the embodiment, and will not be described again here.

[0235] Optional, please refer to Figure 4 The frame 320 also includes an open area Z3 adjacent to the gripping area Z1. The open area Z3 is not gripped when the electronic device 1000 is in a gripping state. The first free end A of the first radiating segment 111 is located in the open area Z3 of the frame 320. The open area Z3 is located at the bottom edge 322. The distance between the open area Z3 and the first side edge 323 can be greater than 10 mm, and the distance between the open area Z3 and the second side edge 324 can be greater than 10 mm.

[0236] Alternatively, please refer to Figure 4 The first radiating segment 111 can also be disposed on the first side 323, and further disposed in the overlapping area Z2 of the first side 323 in the third gripping scenario. The second radiating segment 112 is disposed on the gripping area Z1 of the first side 323 in the first gripping scenario. The third radiating segment 113 is disposed on the bottom edge 322.

[0237] Please see Figure 35 A portion of the second radiator 21 is disposed on the outside of the recessed portion 114, and the second radiator 21 can serve as external protection for the recessed portion 114. The second radiator 21 can also serve as a parasitic branch of the first radiator 11 to improve the efficiency of the LB band and increase the efficiency bandwidth.

[0238] Furthermore, the second radiator 21 can also serve as a parasitic branch of the first antenna element 30 of the electronic device 1000 when folded, as described above.

[0239] Please see Figure 36 The first signal source 12 is used to excite the first radiator 11 and the second radiator 21 to form a third resonant mode that supports the third frequency band.

[0240] Please see Figure 36 The third resonant mode forms a fourth resonant current between the first feed point B and the first free end A, and a fifth resonant current between the second ground end D and the second free end E.

[0241] The fifth resonant current is in the opposite direction to the fourth resonant current. The intensity of the fifth resonant current is greater than that of the fourth resonant current. The fifth resonant current makes the main radiation contribution to the third resonant mode. The fourth resonant current operates in a 1 / 4 wavelength mode of the third frequency band. The fifth resonant current operates in a 1 / 4 wavelength mode of the third frequency band.

[0242] Simultaneously, a distributed current is formed between the first grounding terminal C and the first feed point B in the third resonant mode. This distributed current is approximately a current mode of 1 / 2 wavelength. A portion of the distributed current flows from near the midpoint between the first feed point B and the first grounding terminal C to the first grounding terminal C, while another portion flows from near the midpoint between the first feed point B and the first grounding terminal C to the first feed point B.

[0243] Further, please refer to Figure 37 The first signal source 12 is also used to excite the first radiator 11 to form a fourth resonant mode supporting the fourth frequency band. The fourth resonant mode forms a sixth resonant current between the first ground terminal C and the first free terminal A. The fourth resonant mode is a 3 / 4 wavelength mode of the fourth frequency band. The sixth resonant current includes a 1 / 4 wavelength mode current flowing from near the midpoint between the first feed point B and the first ground terminal C to the first ground point, and a 1 / 2 wavelength mode current flowing from near the midpoint between the first feed point B and the first ground terminal C to the first free terminal A. Simultaneously with the formation of the sixth resonant current, a distributed current flows from the second ground terminal D to the second free terminal E.

[0244] The center frequency of the fourth frequency band is higher than that of the third frequency band, and the difference between the center frequency of the fourth frequency band and the center frequency of the third frequency band is less than 1 GHz. The third frequency band and the fourth frequency band form a continuous frequency band covering Wi-Fi 2.4 GHz. The third resonant mode and the fourth resonant mode support dual-wavelength resonance of Wi-Fi 2.4 GHz to improve the radiation efficiency of the Wi-Fi 2.4 GHz band and increase bandwidth.

[0245] Please see Figure 37The first radiator 11 further includes a connection point P. The antenna assembly 100 also includes a switching circuit T1. The switching circuit T1 is electrically connected to the connection point P. The switching circuit T1 is used to switch the sub-band of the first frequency band. The connection point P is the location of the current strong point of the fourth resonant mode, i.e., the electric barrier location, so that the Wi-Fi 2.4GHz band will not be affected when the switching circuit T1 switches the sub-band of the first frequency band. Further, the location of the current strong point of the fourth resonant mode is, for example, near the first feed point B. Further, the connection point P is the first feed point B, so that the first matching circuit M and the switching circuit T1 can be integrated into one circuit, requiring only one spring contact, which reduces one spring contact compared to the implementation with two spring contact.

[0246] Meanwhile, since the main mode of the third resonant mode is located on the second radiator 21, the electrical length of the second radiator 21 determines the size of the third frequency band. Therefore, the switching circuit T1 is set at the first feed point B, and switching the switching circuit T1 will not affect the size of the third resonant mode and the third frequency band.

[0247] When the switching circuit T1 switches, the third frequency band and the fourth frequency band maintain coverage of the Wi-Fi 2.4GHz band. That is, the antenna assembly 100 provided in this embodiment can maintain the Wi-Fi 2.4GHz band constantly when switching the sub-band of the first frequency band.

[0248] Furthermore, the switching circuit T1 is an impedance-adjustable circuit, or an antenna switching circuit.

[0249] Optionally, the switching circuit T1 includes an antenna switch and / or an adjustable capacitor.

[0250] In the first embodiment of the switch circuit T1, please refer to Figure 38 The switching circuit T1 further includes a second switching unit and multiple first switching branches. One end of each of the multiple first switching branches is electrically connected to one end of the second switching unit, and the other end of the second switching unit is electrically connected to connection point P. That is, the second switching unit includes, but is not limited to, transistors, field-effect transistors, etc. The other ends of each of the multiple first switching branches are grounded.

[0251] Each of the first switching branches has a different impedance value. For example, the multiple first switching branches are multiple capacitors with different capacitance values. Alternatively, the multiple first switching branches are multiple inductors with different inductance values. Or, the multiple first switching branches include multiple capacitors with different capacitance values ​​and multiple inductors with different inductance values. By adjusting the electrical connections of the second switching unit to different devices, the equivalent electrical length of the first switching branch electrically connected to the first radiator 11 is adjusted, thereby switching the sub-frequency band in the supported target frequency band.

[0252] In a second embodiment of the switch switching circuit T1, the switch switching circuit T1 includes an adjustable capacitor. One end of the adjustable capacitor is electrically connected to connection point P, and the other end is grounded. The value of the adjustable capacitor is adjustable and used to switch sub-frequency bands in the supported target frequency band. The adjustable capacitor is a capacitor with an adjustable capacitance value. Thus, by adjusting the capacitance value of the capacitor, the impedance value of the switch switching circuit T1 is adjustable, thereby adjusting the effective electrical length of the switch switching circuit T1, further adjusting the effective electrical length of the first radiator 11, and thus switching sub-frequency bands in the supported target frequency band.

[0253] Of course, the switching circuit T1 can also be a combination of the first and second embodiments described above. For example, the first switching branch includes the adjustable capacitor.

[0254] The electronic device 1000 provided in this embodiment can be a candybar or foldable electronic device.

[0255] The following comparison is made between the antennas provided in this embodiment, with the first free end A disposed on the recessed portion 114 and the antennas with the first free end A disposed on the frame 320.

[0256] Please see Figure 10 , Figure 10 The first free end A is an antenna located on the frame 320 (without the recessed part 114), and the first signal source 12 generates the LB+Wi-Fi 2.4GHz band.

[0257] Please see Figure 10 The antenna with the first free end A located on the frame 320 forms a B28 band operating mode that is a 1 / 4 wavelength mode from the first ground end C to the first free end A.

[0258] Please see Figure 38 The antenna formed by the first free end A on the frame 320 supports the Wi-Fi 2.4GHz band in the following working modes: a 3 / 4 wavelength mode between the first ground end C and the first free end A, and a 1 / 4 wavelength mode from the second free end E to the second ground end D.

[0259] Please see Figure 39 The antenna with its first free end A located on the frame 320 forms an antenna operating in a 24GHz band Wi-Fi mode 2. This mode operates in a 3 / 4 wavelength mode between the first ground end C and the first free end A, and in a 1 / 4 wavelength mode from the second free end E to the second ground end D. The current directions in the first radiator 11 are the same for both Wi-Fi 2.4GHz band operating modes 1 and 2, while the current directions in the second radiator 21 are opposite. This forms a dual-wave resonance in the Wi-Fi 2.4GHz band.

[0260] Please see Figure 40 , Figure 40 These are the S-parameters, radiation efficiency, and overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band and in free space. Curve a represents the S-parameters of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band. Curve b represents the radiation efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band. Curve c represents the overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band.

[0261] Please see Figure 41 , Figure 41 These are the S-parameters, radiation efficiency, and overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band in free space, held with the left hand, and held with the right hand. Curve a1 represents the S-parameters of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band in free space. Curve b1 represents the S-parameters of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the left hand. Curve c1 represents the S-parameters of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the right hand.

[0262] Curve a2 represents the radiation efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band in free space. Curve b2 represents the radiation efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held in the left hand. Curve c2 represents the radiation efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held in the right hand.

[0263] Curve a3 represents the overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band in free space. Curve b3 represents the overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held in the left hand. Curve c3 represents the overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held in the right hand.

[0264] Please refer to Table 1-4, which shows the overall efficiency of the antenna with the first free end A located on the frame 320 operating in the B28 band in free space, with the left hand holding the device, and with the right hand holding the device. As can be seen, although the fingers are holding the gap, the performance of the antenna is not significantly reduced in the left-hand holding scenario due to the medium loading of the palm compared to the free space scenario.

[0265] Table 1-4

[0266]

[0267] Please see Figure 42 , Figure 42 yes Figure 36 The S-parameters and efficiency of the provided antenna assembly 100 are shown. Curve a1 represents the S-parameters of the antenna assembly 100 operating in free space at the B5 frequency band. Curve b1 represents the S-parameters of the antenna assembly 100 operating in the B8 frequency band when held in the left hand. Curve c1 represents the S-parameters of the antenna assembly 100 operating in the B28 frequency band when held in the right hand.

[0268] Curve a2 represents the radiation efficiency of antenna assembly 100 operating in the B5 band in free space. Curve b2 represents the radiation efficiency of antenna assembly 100 operating in the B8 band when held in the left hand. Curve c2 represents the radiation efficiency of antenna assembly 100 operating in the B28 band when held in the right hand.

[0269] Curve a3 represents the overall efficiency of antenna assembly 100 operating in the B5 band in free space. Curve b3 represents the overall efficiency of antenna assembly 100 operating in the B8 band when held in the left hand. Curve c3 represents the overall efficiency of antenna assembly 100 operating in the B28 band when held in the right hand.

[0270] As shown in the figure, when the LB band switches between the B28 band, the B8 band, and the B28 band, the WIFI 2.4G remains active.

[0271] In the scenario where the hand is held, since the palm medium loading still exists when the LB antenna is working, the first free end A is set on the recessed part 114 and is far away from the hand, thus greatly reducing the impact of the gap where the fingers touch the first free end A.

[0272] Please see Figure 43 , Figure 43 yes Figure 36The provided antenna assembly 100 is compared with the antenna with its first free end A mounted on the frame 320 in both right-hand and left-hand holding scenarios. Curve a represents the S-parameters of the antenna assembly 100 operating in the B28 frequency band in free space. Curve b represents the S-parameters of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band in free space. Curve c represents the S-parameters of the antenna assembly 100 operating in the B28 frequency band when held with the left hand. Curve d represents the S-parameters of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the left hand. Curve e represents the S-parameters of the antenna assembly 100 operating in the B28 frequency band when held with the right hand. Curve f represents the S-parameters of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the right hand.

[0273] As shown in the figure, the antenna with the first free end A located on the frame 320 experiences frequency shift when held in the right hand. Figure 36 The provided antenna assembly 100 has virtually no frequency offset when held in the right hand, indicating that the embodiment of this application reduces frequency offset by placing the first free end A in the recessed portion 114, which is farther away from the human body.

[0274] Please see Figure 44 , Figure 44 yes Figure 36 The provided antenna assembly 100 is compared with the antenna with its first free end A mounted on the frame 320 in both right-handed and left-handed holding scenarios. Curve a represents the radiation efficiency of the antenna with its first free end A mounted on the recessed portion 114 operating in the B28 frequency band in free space. Curve b represents the radiation efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band in free space. Curve c represents the radiation efficiency of the antenna with its first free end A mounted on the recessed portion 114 operating in the B28 frequency band when held with the left hand. Curve d represents the radiation efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the left hand. Curve e represents the radiation efficiency of the antenna with its first free end A mounted on the recessed portion 114 operating in the B28 frequency band when held with the right hand. Curve f represents the radiation efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the right hand.

[0275] As shown in the figure, in both left-hand and right-hand holding scenarios, Figure 36 The provided antenna assembly 100 improves efficiency compared to an antenna where the first free end A is located on the frame 320, by placing the first free end A in the recessed portion 114, which reduces the absorption of electromagnetic wave signals by the human hand compared to an antenna where the first free end A is located on the frame 320.

[0276] Please see Figure 45 , Figure 45 yes Figure 36The provided antenna assembly 100 is compared with the antenna with its first free end A mounted on the frame 320 in both right-hand and left-hand holding scenarios. Curve a represents the overall efficiency of the antenna with its first free end A mounted on the recessed portion 114 operating in the B28 frequency band in free space. Curve b represents the overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band in free space. Curve c represents the overall efficiency of the antenna with its first free end A mounted on the recessed portion 114 operating in the B28 frequency band when held with the left hand. Curve d represents the overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the left hand. Curve e represents the overall efficiency of the antenna with its first free end A mounted on the recessed portion 114 operating in the B28 frequency band when held with the right hand. Curve f represents the overall efficiency of the antenna with its first free end A mounted on the frame 320 operating in the B28 frequency band when held with the right hand.

[0277] As shown in the figure, in both left-hand and right-hand holding scenarios, Figure 36 The provided antenna assembly 100, by placing the first free end A in the recessed portion 114, reduces the absorption of electromagnetic wave signals by the human hand compared to an antenna where the first free end A is located on the frame 320, thus improving efficiency. The efficiency improvement is particularly significant in scenarios where the device is held with the left hand.

[0278] Please refer to Table 1-5, which is... Figure 36 A comparison of the overall efficiency of the provided antenna assembly 100 and the antenna with the first free end A located on the frame 320 in the B28 band in free space, right-hand holding, and left-hand holding scenarios. Figure 36 The overall efficiency of the provided antenna assembly 100 in free space is comparable to the overall efficiency of the antenna with the first free end A disposed on the frame 320 in free space. Figure 36 The provided antenna assembly 100 improves the situation where fingers are stuck on the gap in the right-hand holding scenario by placing the first free end A in the recessed portion 114. Since the adverse effects of fingers touching the first free end A are reduced, while the dielectric loading effect of the palm is preserved, the basic performance is not degraded in the left-hand holding scenario. Figure 36 The overall efficiency of the provided antenna assembly 100 in a right-handed scenario is improved by nearly 2 dB compared to the overall efficiency of the antenna with the first free end A located on the frame 320 in a right-handed scenario.

[0279] Table 1-5

[0280]

[0281] The embodiments of this application have been shown and described above. It is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. An electronic device, characterized in that, include: The frame includes a gripping area and an overlapping area. The gripping area is held by a hand in a first gripping scenario and by a thumb in a second gripping scenario. The overlapping area is overlapped by fingers in a third gripping scenario. and An antenna assembly includes a first radiator and a first signal source. The first radiator includes a first radiating segment, a second radiating segment, and a third radiating segment that are interconnected and arranged sequentially. The end of the first radiating segment away from the second radiating segment is a first free end. The end of the third radiating segment away from the second radiating segment is a first ground end. The second radiating segment includes a first feed point. The first signal source is electrically connected to the first feed point and is used to excite the formation of a first resonant mode supporting a first frequency band on the first radiator; the first radiating segment or the third radiating segment includes a recessed portion, the recessed portion being disposed inside the overlap area of ​​the frame and spaced apart from the overlap area of ​​the frame; the first resonant current of the first resonant mode is at least distributed in the recessed portion and the second radiating segment, at least a portion of the second radiating segment being the holding area of ​​the frame, the second radiating segment being used to form a dielectric loading of the first resonant mode under holding.

2. The electronic device as claimed in claim 1, characterized in that, The first radiating segment or the third radiating segment further includes an extension disposed parallel to the sunken portion. The extension is part of the overlapping area of ​​the frame. One end of the extension is connected to the second radiating segment, and the other end of the extension is bent and connected to the sunken portion. The extension and the sunken portion surround and form a hollow area.

3. The electronic device as described in claim 2, characterized in that, The first resonant mode is a 1 / 4 wavelength mode resonating from the first ground terminal to the first free terminal, and the first resonant current of the first resonant mode is also distributed in the extension.

4. The electronic device as claimed in claim 1, characterized in that, The sunken portion is located in the third radiation section, and the end of the sunken portion away from the second radiation section is the first grounding terminal.

5. The electronic device as claimed in claim 4, characterized in that, The antenna assembly further includes a second radiator, which includes a second ground end and a second free end. The second free end is spaced apart from the first radiator. The second ground end is located on the side of the second free end away from the first radiator. The second radiator is part of the frame. At least a portion of the recessed portion is located inside the second radiator and spaced apart from it.

6. The electronic device as claimed in claim 5, characterized in that, The electronic device is a foldable electronic device, which includes a first main body and a second main body that can be folded relative to each other. The antenna assembly is disposed on the second main body, and the second radiator is also used to couple with the first antenna unit on the first main body when the electronic device is folded.

7. The electronic device as claimed in claim 6, characterized in that, The first antenna element includes a third radiator and a second signal source. The third radiator includes a third ground terminal, a second feed point, and a third free terminal arranged sequentially. The second feed point is electrically connected to the second signal source. The third radiator and the second radiator are opposite to and coupled when the electronic device is folded. The direction of the third ground terminal pointing to the third free terminal is opposite to the direction of the second ground terminal pointing to the second free terminal. The second signal source is used to excite the third radiator and the second radiator to form a resonant mode when the electronic device is folded.

8. The electronic device as claimed in claim 7, characterized in that, The first antenna element further includes a fourth radiator, which includes a fourth ground terminal and a fourth free terminal. The fourth free terminal and the third free terminal are connected by a first coupling gap. The fourth radiator and the second radiator are opposite each other when the electronic device is folded. The second signal source is used to excite the second radiator, the third radiator and the fourth radiator to form a resonant mode when the electronic device is folded.

9. The electronic device as claimed in claim 1, characterized in that, The frame also includes an open area adjacent to the gripping area, wherein the open area is not gripped when the electronic device is in a gripping state, and the first free end of the first radiating segment is located in the open area of ​​the frame; The frame includes a top edge, a first side edge, a bottom edge, and a second side edge connected in sequence. The gripping area is located on the second side edge near the bottom edge. The overlapping area is located on the second side edge on the side where the gripping area is away from the bottom edge. The open area is located on the bottom edge near the second side edge. Alternatively, the gripping area is located on the first side edge near the bottom edge. The overlapping area is located on the second side edge on the side where the gripping area is away from the bottom edge. The open area is located on the bottom edge near the first side edge.

10. The electronic device according to any one of claims 1-9, characterized in that, The antenna assembly further includes a fifth radiator located on the side of the first radiating segment away from the second radiating segment. The fifth radiator is coupled to the first radiator. The first signal source is also used to excite the formation of a second resonant mode supporting the second frequency band on the fifth radiator. The first resonant mode and the second resonant mode form a dual-wave resonance. The center frequency of the second frequency band is smaller than the center frequency of the first frequency band.

11. The electronic device as claimed in claim 10, characterized in that, The fifth radiator includes a fifth free end and a fifth ground end. The fifth ground end and the first free end are connected by a second coupling gap. The fifth free end is located on the side of the fifth ground end away from the first free end. The second resonant mode resonates between the fifth ground end and the fifth free end. The second resonant mode is a 1 / 4 wavelength mode of the second frequency band.

12. The electronic device as claimed in claim 11, characterized in that, The length of the fifth radiator is less than the length of the first radiator; The antenna assembly further includes an inductor, one end of which is electrically connected to the fifth ground terminal and the other end of which is grounded. The inductor is used to make the electrical length of the fifth radiator greater than the electrical length of the first radiator.

13. The electronic device as claimed in claim 12, characterized in that, The electronic device is a foldable electronic device, which includes a first main body and a second main body that can be folded relative to each other. The first main body includes a second antenna unit that supports the MHB band. The antenna assembly is disposed on the second main body. The fifth radiator is also used to couple with the second antenna unit on the first main body when the electronic device is folded. The antenna assembly further includes a capacitor element, one end of which is electrically connected to the fifth ground terminal, and the other end of which is grounded. The capacitor element is used to conduct the MHB frequency band and block the first frequency band and the second frequency band. The inductor element is used to conduct the first frequency band and the second frequency band and block the MHB frequency band.

14. The electronic device as claimed in claim 12, characterized in that, The antenna assembly further includes a switching unit, one end of which is electrically connected to the fifth ground terminal, and the other end of which can be selectively connected to one end of the inductor or grounded. The switching unit is used to switch to ground when the electronic device is folded, and to switch to electrical connection to the inductor when the electronic device is unfolded.

15. The electronic device as claimed in claim 10, characterized in that, A third coupling gap is formed between the fifth free end and the first free end; the fifth grounding end is located on the side of the fifth free end away from the first free end; the electrical length of the fifth radiator is less than the electrical length of the first radiator. The first resonant mode also forms a second resonant current on the fifth radiator, the direction of which is the same as the direction of the first resonant current on the first radiator; The second resonant mode also generates a third resonant current on the first radiator, and the resonant current of the second resonant mode on the fifth radiator is in the opposite direction to the third resonant current.

16. The electronic device as claimed in claim 4, characterized in that, The sunken portion is located in the first radiating section, and the end of the sunken portion away from the second radiating section is the first free end; The first signal source is also used to excite the first radiator and the second radiator to form a third resonant mode supporting the third frequency band. The third resonant mode forms a fourth resonant current between the first feed point and the first free end, and a fifth resonant current between the second ground end and the second free end. The fifth resonant current is opposite in direction to the fourth resonant current, and the intensity of the fifth resonant current is greater than that of the fourth resonant current. The operating mode of the fourth resonant current is the 1 / 4 wavelength mode of the third frequency band, and the operating mode of the fifth resonant current is the 1 / 4 wavelength mode of the third frequency band.

17. The electronic device as claimed in claim 16, characterized in that, The first signal source is also used to excite the first radiator to form a fourth resonant mode supporting the fourth frequency band. The fourth resonant mode forms a sixth resonant current between the first ground terminal and the first free terminal. The fourth resonant mode is a 3 / 4 wavelength mode of the fourth frequency band.

18. The electronic device as claimed in claim 17, characterized in that, The third frequency band and the fourth frequency band form a continuous frequency band covering Wi-Fi 2.4GHz, and the third resonance mode and the fourth resonance mode are dual-wave resonance.

19. The electronic device as claimed in claim 17, characterized in that, The first radiator further includes a connection point, and the antenna assembly further includes a switching circuit. The switching circuit is electrically connected to the connection point and is used to switch the sub-band of the first frequency band. The connection point is the location of the current strong point of the fourth resonant mode. The third frequency band and the fourth frequency band cover Wi-Fi 2.4GHz when the switching circuit is switched.

20. The electronic device according to any one of claims 1-9 and 11-19, characterized in that, The first frequency band is less than or equal to 0.9 GHz.

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