Electronic device

Abstract

The application provides an electronic device, a frame includes a top edge, a first side edge, a bottom edge and a second side edge connected in sequence, the first side edge includes a finger overlap area and a palm holding area; an antenna assembly includes a first radiator and a first signal source, the first radiator includes a first free end, a first feeding point and a first ground end arranged in sequence, the first free end is located on the bottom edge, the first ground end is located on the first side edge, and the first ground end is located between the finger overlap area on the first side edge and the bottom edge; the first signal source is electrically connected with the first feeding point to excite the first radiator to form a first resonance mode supporting a first frequency band, and the first radiator further includes a target radiation section, the target radiation section is at least partially a strong current distribution section in the first resonance mode, at least part of the target radiation section is arranged in the palm holding area of the first side edge, and the target radiation section is used for forming medium loading on the first resonance mode under palm holding. The application can improve the antenna performance in a handheld scenario.

Description

TECHNICAL FIELD

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

[0002] The common scene of electronic devices such as mobile phones is a handheld scene, and the hand has a certain absorption effect on the electromagnetic waves radiated by the antenna in the electronic device, thereby causing the antenna performance to decline. How to improve the antenna performance of the electronic device in the handheld scene becomes a technical problem to be solved. SUMMARY

[0003] The present application provides an electronic device for improving the antenna performance in the handheld scene.

[0004] An electronic device provided by an embodiment of the present application comprises:

[0005] A frame, the frame comprises a top edge, a first side edge, a bottom edge and a second side edge connected in sequence, the first side edge comprises a finger overlap area and a palm holding area, and the finger overlap area is located on a side of the palm holding area away from the bottom edge;

[0006] An antenna assembly, comprising a first radiator and a first signal source, the first radiator comprises a first free end, a first feeding point and a first grounding end arranged in sequence, the first free end is located on the bottom edge, the first grounding end is located on the first side edge, and the first grounding end is located between the finger overlap area on the first side edge and the bottom edge; the first signal source is electrically connected to the first feeding point to excite the first radiator to form a first resonant mode supporting a first frequency band, the first radiator further comprises a target radiation section, the target radiation section is at least partially a strong current distribution section in the first resonant mode, at least part of the target radiation section is arranged in the palm holding area of the first side edge, and the target radiation section is used to form a dielectric loading on the first resonant mode under palm holding.

[0007] The electronic device provided by the embodiment of the present application is characterized in that the first radiator comprises a first free end, a first feeding point and a first grounding end arranged in sequence, the first free end is located at the bottom edge, the first grounding end is located at the first side edge, and the first grounding end is located between the finger overlapping area on the first side edge and the bottom edge, so as to avoid the first grounding end being held by the finger overlapping area in the holding scene and to avoid the antenna performance being reduced due to the absorption of the fingers; the first signal source is electrically connected with the first feeding point, so as to excite the first radiator to form a first resonance mode supporting the first frequency band, the first radiator further comprises a target radiation section, the target radiation section is a strong current distribution section in the first resonance mode, at least part of the target radiation section is arranged in the palm holding area of the first side edge, and the target radiation section is used to work under the palm holding to form a dielectric loading on the first resonance mode, the dielectric loading can improve the radiation performance of the antenna assembly in the first resonance mode, and further improve the antenna performance in the palm holding scene, so as to improve the antenna performance in the handheld scene. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced.

[0009] Figure 1 FIG. 1 is a structural schematic diagram of an electronic device provided by the embodiment of the present application;

[0010] Figure 2 FIG. 2 is a partial structural schematic diagram of the electronic device provided by the embodiment of the present application when the electronic device is a foldable electronic device;

[0011] Figure 3 FIG. 3 is a structural schematic diagram of a frame and an antenna assembly provided by the embodiment of the present application;

[0012] Figure 4a FIG. 4 is a left-hand holding schematic diagram of a straight-line type electronic device provided by the present application;

[0013] Figure 4b FIG. 5 is a right-hand holding schematic diagram of a straight-line type electronic device provided by the present application;

[0014] Figure 5a FIG. 6 is a right-hand holding schematic diagram of a folding type electronic device provided by the present application, in which the rotation shaft is on the top;

[0015] Figure 5b FIG. 7 is a left-hand holding schematic diagram of a folding type electronic device provided by the present application, in which the rotation shaft is on the top;

[0016] Figure 6 FIG. 8 is a structural schematic diagram of an antenna assembly provided by the first embodiment of the present application;

[0017] Figure 7 FIG. 9 shows that the process from unfolding to folding of the electronic device can be divided into four processes: unfolding→halving→folding+disconnection→folding.

[0018] Figure 8 is the S parameter and efficiency curve corresponding to the four states of unfolding, halving of the electronic device, folding of the electronic device and not connecting, folding of the electronic device from unfolding to folding of the electronic device;

[0019] Figures 9a-9f is a structural schematic diagram of the six groups of antennas provided in the present application;

[0020] Figure 10 is the S parameter, radiation efficiency and total efficiency curve of the third group of antennas in the closed cover + free space and closed cover + left-hand holding scenarios according to the third embodiment of the present application;

[0021] Figure 11 is the S parameter, radiation efficiency and total efficiency curve of the third group of antennas in the closed cover + free space and closed cover + right-hand holding scenarios according to the third embodiment of the present application;

[0022] Figure 12 is the S parameter and efficiency curve of the third group of antennas in the closed cover + free space, closed cover + left-hand holding, closed cover + left-hand holding without the thumb, closed cover + left-hand holding only with the thumb, and closed cover + left-hand holding only with the left-hand palm according to the third embodiment of the present application;

[0023] Figure 13 is a structural schematic diagram of the first radiation section and the second radiation section of the antenna assembly according to the first embodiment of the present application;

[0024] Figure 14 is a current simulation diagram of the antenna assembly in the IFA mode according to the first embodiment of the present application;

[0025] Figure 15 is a current distribution schematic diagram of the antenna assembly in the IFA mode according to the first embodiment of the present application;

[0026] Figure 16 is a current simulation diagram of the antenna assembly in the CRLH mode according to the first embodiment of the present application;

[0027] Figure 17 is the radiation efficiency and total efficiency curve of the antenna assembly in the folded + right-hand holding, folded + free space, and folded + left-hand holding scenarios according to the first embodiment of the present application;

[0028] Figure 18 is the radiation efficiency and total efficiency curve of the antenna assembly in the folded + right-hand holding, folded + right-hand holding close to the head, and folded + free space scenarios according to the first embodiment of the present application;

[0029] Figure 19is a radiation efficiency, total efficiency curve of the antenna assembly provided by the first embodiment of the present application in the folded + free space, folded + left hand handheld, folded + left hand close to the head scene;

[0030] Figure 20 is a radiation efficiency, total efficiency curve of the antenna assembly provided by the first embodiment of the present application in the unfolded free space in the B8 frequency band and the B28 frequency band;

[0031] Figure 21 is a structural schematic diagram of an antenna assembly provided by the second embodiment of the present application;

[0032] Figure 22 is a current distribution diagram of a third sub-mode in an antenna assembly provided by the second embodiment of the present application;

[0033] Figure 23 is a current distribution diagram of a fourth sub-mode in an antenna assembly provided by the second embodiment of the present application;

[0034] Figure 24 is a structural schematic diagram of another antenna assembly provided by the second embodiment of the present application;

[0035] Figure 25 is a structural schematic diagram of a first antenna assembly provided by the third embodiment of the present application;

[0036] Figure 26 is a current distribution schematic diagram of a first sub-mode of a second antenna assembly provided by the third embodiment of the present application;

[0037] Figure 27 is a current distribution schematic diagram of a second sub-mode of the second antenna assembly provided by the third embodiment of the present application;

[0038] Figure 28 is a structural schematic diagram of an electronic device rotating folding provided by the fourth embodiment of the present application;

[0039] Figure 29 is a structural schematic diagram of an electronic device sliding folding provided by the fourth embodiment of the present application;

[0040] Figure 30 is a structural schematic diagram of an antenna assembly in an unfolded state provided by the fourth embodiment of the present application;

[0041] Figure 31 is a side view schematic diagram of an antenna assembly in a folded state provided by the fourth embodiment of the present application;

[0042] Figure 32 is a current distribution diagram of a fifth sub-mode of an antenna assembly in a folded state provided by the fourth embodiment of the present application;

[0043] Figure 33is a current distribution diagram of a sixth sub-mode of the antenna assembly in a folded state according to the fourth embodiment of the present application;

[0044] Figure 34 is a structural schematic diagram of a position layout of a top edge and a bottom edge of the antenna assembly according to the fourth embodiment of the present application;

[0045] Figure 35 is an S curve and an efficiency curve of a GPS-L1 antenna without a parasitic branch and arranged in a middle part of a top edge of an electronic device (in a folded state) in a free space and in a right-hand holding scenario;

[0046] Figure 36 is an S curve and an efficiency curve of a GPS-L1 antenna with a parasitic branch and a GPS-L1 antenna without a parasitic branch and arranged in a middle part of a top edge of an electronic device (in a folded state) according to the embodiment;

[0047] Figure 37 is an S curve and an efficiency curve of a GPS-L1 antenna without a parasitic branch and a GPS-L1 antenna with a parasitic branch (a second radiator) arranged in a middle part of a top edge of an electronic device (in a folded state) in a right-hand holding scenario.

[0048] BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Electronic device 1000; antenna assembly 100; display screen 200; middle frame 300; back cover 400; first display part 210; bending part 220; second display part 230; top edge 321; bottom edge 322; first side edge 323; second side edge 324; palm holding area Z1; finger overlapping area Z2; open area Z3; first radiator 11; first signal source 12; first free end D; first feeding point B; first ground end A; target radiation section 110; first radiation section 110a; second radiation section 110b; second radiator 22; second free end E; second ground end G; second tuning circuit T2; second feeding point F; second signal source 21; second matching circuit M2; first tuning circuit T1; first main body 10; second main body 20; third radiator 33; third signal source 31; third free end H; third feeding point J; third ground end K; third matching circuit M3. DETAILED DESCRIPTION

[0050] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the embodiments described in the present application are only part of the embodiments, rather than all the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the protection scope of the present application.

[0051] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or independent in terms of their abstraction. It is explicitly and implicitly understood by those skilled in the art that an embodiment described herein can be combined with another embodiment, whether explicitly described or not.

[0052] The terms "first", "second", and the like in the description and in the claims of the application and above drawings are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. Moreover, the terms "comprises", "comprising", "includes", "including" and the like are meant to be interpreted broadly to encompass the inclusion of two or more components, steps, features, elements, etc. without necessarily excluding other components, steps, features, elements, etc. For example, a component or device that comprises one or more components, steps, features, elements, etc. does not necessarily exclude one or more other components, steps, features, elements, etc. that are not expressly listed or even anticipated (A component or device that "comprises" or "comprising" one or more components does not necessarily exclude other components, steps, features, elements, etc. that are not listed recited explicitly or even anticipated).

[0053] Reference is made to Figure 1 , Figure 1 A structural schematic diagram of an electronic device 1000 is provided in an embodiment of the application. The electronic device 1000 includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a computer, a wearable device, a drone, a robot, a digital camera, and the like, which has a communication function. The mobile phone is taken as an example for description in the embodiment of the application, and other electronic devices can refer to the embodiment.

[0054] Reference is made to Figure 2 , Figure 2is a local partial exploded schematic view of the electronic device 1000. The electronic device 1000 includes an antenna assembly 100. The working environment of the antenna assembly 100 is exemplified by taking the electronic device 1000 as a mobile phone. The electronic device 1000 includes a display screen 200, a middle frame 300 and a back cover 400 arranged in sequence along the thickness direction. The middle frame 300 includes a middle plate 310 and a bezel 320 surrounding the periphery of the middle plate 310. The bezel 320 can be a conductive bezel. Of course, in other embodiments, the electronic device 1000 can not have the middle plate 310. The display screen 200, the middle plate 310 and the back cover 400 are arranged in sequence, and a receiving space is formed between the display screen 200 and the middle plate 310 and between the middle plate 310 and the back cover 400 to accommodate devices such as a main board, a camera module, a receiver module, a battery, various sensors, etc. One side of the bezel 320 surrounds the edge of the display screen 200, and the other side of the bezel 320 surrounds the edge of the back cover 400 to form the complete appearance structure of the electronic device 1000. In this embodiment, the bezel 320 and the middle plate 310 are an integral structure, and the bezel 320 and the back cover 400 can be a split structure. The above is the working environment of the antenna assembly 100 taking the mobile phone as an example, but the antenna assembly 100 of the present application is not limited to the above working environment.

[0055] Optionally, the electronic device 1000 is a non-foldable electronic device, such as a straight phone, etc.

[0056] Optionally, the electronic device 1000 is a foldable electronic device, such as a folding phone, etc. 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 rotation shaft, and at least one of the first body 10 and the second body 20 rotates around the rotation shaft. The display screen 200 is a flexible display screen.

[0057] Please refer to Figure 3 , Figure 3Figure 16 is a back view of the electronic device 1000. The frame 320 includes a top edge 321, a bottom edge 322, a first side edge 323, and a second side edge 324. The top edge 321 is the edge that is farthest from the ground when the electronic device 1000 is held vertically by a user. The bottom edge 322 is the edge that is closest to the ground when the electronic device 1000 is held vertically by a user. The first side edge 323 is the left side edge when the electronic device 1000 is held vertically by a user. The second side edge 324 is the right side edge when the electronic device 1000 is held vertically by a user. Of course, the first side edge 323 can also be the right side edge when the electronic device 1000 is held by a user. The second side edge 324 can also be the left side edge when the electronic device 1000 is held by a user. From the perspective of holding, when the electronic device 1000 is held vertically by a user, the hand holds the first side edge 323 and the second side edge 324, the bottom edge 322 can or can not be held by the hand, and the top edge 321 is not held by the hand and is farther from the hand than the bottom edge 322. For example, when the electronic device 1000 is a mobile phone, 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.

[0058] Figure 17 is a front view of the electronic device 1000. Figures 4a-5b Figure 18 is a side view of the electronic device 1000.

[0059] Figure 19 is a front view of the electronic device 1000. Figures 4a-5b Figures 4a-4b For example, when the electronic device 1000 is a straight mobile phone, Figures 4a-4b Figure 20 is a front view of the electronic device 1000. Figures 5a-5b For example, when the electronic device 1000 is a folding mobile phone,

[0060] In the left-hand holding scenario, the area of the first side edge 323 that is closest to the bottom edge 322 is the palm holding area Z1, the middle area of the first side edge 323 is the thumb overlap area Z21 in the finger overlap area Z2, and the lower middle area of the second side edge 324 is the finger overlap area Z2.​

[0061] In the right-hand holding scenario, the area of the second side edge 324 close to the bottom edge 322 is the palm holding area Z1, and the middle area of the second side edge 324 is the thumb overlap area Z21 in the finger overlap area Z2; the middle and lower part of the first side edge 323 is the finger overlap area Z2. It can be understood that due to the difference in palm size of different users, the position of the fingers overlapping the frame 320 of the electronic device 1000 and the position of the palm holding the frame of the electronic device 1000 will be different when different users hold the same electronic device 1000 with the same gesture. As an example, the finger overlap area Z2 and the palm holding area Z1 described in the present application can be the corresponding areas formed when a user with any size palm holds the electronic device 1000 of the present application with the same gesture. For example, the finger overlap area Z2 of the present application can be the area where the frame 320 of the electronic device 1000 is overlapped by the fingers when a user with any size palm holds the electronic device 1000 of the present application with the same gesture; the palm holding area Z1 can be the area where the frame 320 of the electronic device 1000 is covered by the palm and in contact with the palm when a user with any size palm holds the electronic device 1000 of the present application with the same gesture.

[0062] The specific structure of the antenna assembly 100 is illustrated below in combination with the drawings.

[0063] Please refer to Figure 3 and Figure 6 , Figure 3 is a structural schematic diagram of a straight electronic device, Figure 6 is a structural schematic diagram of an electronic device in a folded state. The antenna assembly 100 includes a first radiator 11 and a first signal source 12.

[0064] Please refer to Figure 3 and Figure 6 , the first radiator 11 includes a first free end D, a first feed point B and a first ground end A arranged in sequence.

[0065] The first free end D is a disconnected end from other conductive structures. The first free end D is located at the bottom edge 322. Further, the first free end D is arranged at the open area Z3 of the bottom edge 322. Optionally, the open area Z3 of the bottom edge 322 is located at an area with a distance greater than 20mm from the first side edge 323 and the second side edge 324.

[0066] Since the first free end D is located at a point with strong electric field, the direction of the electric field is parallel to the frame (e.g. the bottom edge 322). If the hand contacts the first free end D, the energy of the parallel electric field will be absorbed, resulting in serious frequency deviation and other problems. The embodiment places the first free end D in the open area Z3 of the bottom edge 322, which is an area that cannot be held by fingers in either left-hand holding or right-hand holding scenarios. In this way, the first free end D is not affected by holding, reducing frequency deviation.

[0067] Please refer to Figure 3 and Figure 6 The first ground end A is located on the first side edge 323. The first ground end A is between the finger overlap area Z2 on the first side edge 323 and the bottom edge 322. Optionally, the distance between the finger overlap area Z2 and the bottom edge 322 is greater than 20 mm. In this way, the distance between the first ground end A and the bottom edge 322 is less than or equal to 20 mm.

[0068] Alternatively, the first ground end A can also be located at the junction of the bottom edge 322 and the first side edge 323. In this way, in the left-hand holding scenario, the first ground end A is between the thumb overlap area Z21 in the finger overlap area Z2 and the bottom edge 322, i.e. outside the thumb overlap area Z21 in the finger overlap area Z2. In the right-hand holding scenario, the first ground end A is between the finger overlap area Z2 and the bottom edge 322, i.e. outside the finger overlap area Z2. Therefore, whether in the left-hand holding scenario or the right-hand holding scenario, the fingers will not overlap with the first ground end A, reducing the efficiency reduction caused by the fingers overlapping the first ground end A and absorbing the energy of the electromagnetic wave, reducing the impact of hand holding on the performance of the antenna, and balancing the performance of the finger holding / palm holding scenario.

[0069] The first signal source 12 is electrically connected to the first feeding point B to excite the first radiator 11 to form a first resonant mode supporting a first frequency band. The first signal source 12 includes but is not limited to a radio frequency transceiver chip. The first signal source 12 excites the first radiator 11 to form a resonance for receiving and transmitting electromagnetic wave signals of the first frequency band.

[0070] Please refer to Figure 3 and Figure 6The first radiator 11 further comprises a target radiation section 110. The target radiation section 110 is a strong current distribution section in the first resonant mode. A weak current distribution section is near the first free end D (about 1 / 5 of the total length of the first radiator 11). The current intensity of the strong current distribution section is greater than that of the weak current distribution section. The first grounding end A and the first feeding point B are both strong current points in the first resonant mode. The strong current distribution section of the first radiator 11 in the first resonant mode is the area from the first grounding end A to a position 4 / 5 of the total length of the first radiator 11 away from the first grounding end A. The target radiation section 110 can be the entire strong current distribution section or part of the strong current distribution section.

[0071] Please refer to Figure 3 and Figure 6 At least part of the target radiation section 110 is arranged in the palm holding area Z1 of the first side edge 323 (for example, the palm contacts the target radiation section 110 when the left hand holds), and the target radiation section 110 is used to form dielectric loading for the first resonant mode when the palm holds. The palm holding area Z1 of the first side edge 323 is the area where the palm is close to when the left hand holds. For example, the hand holding area is an area on the first side edge 323 connected to the bottom edge 322 and less than 40 mm. In addition, when the left hand holds, part of the bottom edge 322 is also a palm holding area Z1, for example, an area on the first side edge 323 and less than 20 mm.

[0072] The target radiation section 110 can be entirely arranged in the palm holding area Z1, or part of the target radiation section 110 is arranged in the palm holding area Z1 and the other part is arranged in an area outside the palm holding area Z1 on the bottom edge 22.

[0073] Optionally, the first grounding end A is located in the palm holding area Z1. Since the first grounding end A is a strong current point in the first resonant mode, in the hand holding scenario, the palm contacts the first grounding end A, and the strong current can enhance the dielectric loading effect, thereby improving the radiation efficiency of the first resonant mode of the antenna assembly 100. Specifically, the distance between the first grounding end A and the bottom edge 322 is less than 20 mm.

[0074] By designing the structure of the antenna assembly 100 and the mounting position on the frame, the target radiation section 110 of the antenna assembly 100 is located in the palm holding area Z1 of the first side edge 323, so that the target radiation section 110 of the antenna assembly 100 is held in the palm holding scenario, thereby forming a dielectric loading effect.

[0075] The following is a specific description of the antenna assembly 100 forming a medium load in the target radiation section 110 in a palm holding state: since the target radiation section 110 is arranged at the palm holding area Z1 of the first side edge 323. In the left hand holding scenario, the palm contacts the target radiation section 110. The equivalent dielectric constant of the palm is large, for example, 25-40, which is much larger than the dielectric constant of air 0, so the palm contacting the target radiation section 110 is equivalent to changing the radiation environment of the electromagnetic wave radiated by the target radiation section 110. The palm forms a high dielectric constant medium in the electromagnetic wave radiation space. Based on the principle that the wavelength of the electromagnetic wave will be shortened in the high dielectric constant medium, covering or surrounding the radiator with a medium (such as a palm) can greatly reduce the size of the antenna in the corresponding frequency band, that is, the medium load can play a role in miniaturization. In the electronic device 1000, the length of the target radiation section 110 before and after the palm holding is equal, so after the palm holding, the equivalent dielectric constant around the target radiation section 110 is changed, and since the electrical length of the target radiation section 110 does not change, according to the wavelength shortening effect, the radiation ability will shift towards low frequency, that is, the radiation efficiency peak shifts towards low frequency.

[0076] In the first resonance mode, a strong current is distributed on the target radiation section 110, which encounters the high dielectric constant medium formed by the palm during radiation. Therefore, the radiation efficiency peak in the first resonance mode will shift towards low frequency. Since the radiation efficiency of the first resonance mode gradually increases in the first frequency band and on the high frequency side of the first frequency band, that is, the radiation efficiency on the high frequency side of the first frequency band is higher than the radiation efficiency of the first frequency band. Therefore, after the radiation efficiency peak of the first resonance mode shifts towards low frequency, the radiation efficiency of the first frequency band increases, that is, the antenna assembly 100 described herein forms a medium load in a hand holding state and a first resonance mode, thereby improving the radiation efficiency in the first resonance mode.

[0077] In this embodiment, the efficiency of the target radiation section 110 after forming a medium load for the first resonance mode is greater than the efficiency of the target radiation section 110 without forming a medium load for the first resonance mode. In other words, forming a medium load for the first resonance mode by the target radiation section 110 brings efficiency improvement.

[0078] Generally, when the hand contacts the radiator of the antenna assembly 100, the hand has an absorption effect on the electromagnetic wave radiated by the radiator. In this application, since the area contacted by the palm is not the radiation section where the first free end D is located, and the efficiency improvement brought by the medium load of the palm to the antenna assembly 100 is greater than the efficiency reduction brought by the absorption effect of the palm, the overall effect is that the antenna assembly 100 forms a medium load in a palm holding state and a first resonance mode, thereby improving the radiation efficiency in the first resonance mode.

[0079] In the above antenna assembly 100 design, in a left-hand holding scenario, since the first free end D of the antenna assembly 100 is located in the open area Z3 of the bottom edge 322 that is not held by the hand, frequency deviation is avoided, and the palm holds the target radiation section 110, thereby achieving medium loading in the first frequency band and improving the radiation efficiency of the first frequency band; in a right-hand holding scenario, since the first free end D of the antenna assembly 100 is located in the open area Z3 of the bottom edge 322 that is not held by the hand, and the first ground end A is located outside the finger overlap area Z2 domain, absorption caused by the fingers overlapping the first ground end A is reduced, thereby improving the antenna performance in both left-hand holding scenarios and right-hand holding scenarios.

[0080] The present application does not limit the specific size of the first frequency band, which can be, but is not limited to, a low frequency less than 1 GHz. Further, the first frequency band is less than or equal to 0.9 GHz. Alternatively, the first frequency band can be, but is not limited to, B28 and N28 frequency bands.

[0081] The electronic device 1000 provided by the present application includes a first radiation body 11 including a first free end D, a first feed point B, and a first ground end A arranged in sequence, the first free end D is located on the bottom edge 322, the first ground end A is located on the first side edge 323, and the first ground end A is located between the finger overlap area Z2 on the first side edge 323 and the bottom edge 322 to avoid the first ground end A being held by the finger overlap scenario and to avoid the antenna performance being reduced due to the absorption of the fingers; a first signal source 12 is electrically connected to the first feed point B to excite the first radiation body 11 to form a first resonance mode supporting the first frequency band, the first radiation body 11 further includes a target radiation section 110, the target radiation section 110 is a strong current distribution section in the first resonance mode, the target radiation section 110 is arranged in the palm holding area Z1 of the first side edge 323, and the target radiation section 110 is used to form medium loading on the first resonance mode under palm holding, which can improve the radiation performance of the antenna assembly 100 in the first resonance mode, thereby improving the antenna performance in the palm holding scenario and improving the antenna performance in the handheld scenario.

[0082] For the electronic device 1000 being a foldable electronic device, since the area of the reference floor is halved after folding, it has a great impact on efficiency, especially for low frequencies that rely on reference floor radiation.

[0083] Please refer to Figure 7 , Figure 7 The process from unfolding to folding of the electronic device 1000 can be divided into four processes: unfolding → halving → folding + disconnection → folding.

[0084] Please refer to Figure 8 , Figure 8The process from unfolding to folding of the electronic device 1000 can be divided into four states corresponding to S parameters and efficiency curves of unfolding, halving of the electronic device 1000, folding of the electronic device 1000 and not connecting, and folding. Curve a1 is an S parameter curve of the electronic device 1000 in the unfolded state. Curve b1 is an S parameter curve of the electronic device 1000 in the folded and not connected state. Curve c1 is an S parameter curve of the electronic device 1000 in the halved state. Curve d1 is an S parameter curve of the electronic device 1000 in the folded state. Curve a2 is an efficiency curve of the electronic device 1000 in the unfolded state. Curve b2 is an efficiency curve of the electronic device 1000 in the folded and not connected state. Curve c2 is an efficiency curve of the electronic device 1000 in the halved state. Curve d2 is an efficiency curve of the electronic device 1000 in the folded state.

[0085] The radiation efficiency change process of the electronic device 1000 in the above four states is as follows:

[0086] (1) Unfolding of the electronic device 1000→halving of the electronic device 1000: In this process, the reference floor is halved, the longitudinal current from the reference floor greatly reduces the contribution to the radiation efficiency, and the 'left side band' of the radiation efficiency moves to the right, which is the main reason for the large drop of the low-frequency antenna in the folded state.

[0087] (2) Halving of the electronic device 1000→folding and not connecting of the electronic device 1000: In this process, due to the addition of the other half of the reference floor (metal), the reverse current increases, and the overall radiation efficiency decreases.

[0088] (3) Folding and not connecting of the electronic device 1000→folding of the electronic device 1000: In this process, the boundary condition is formed, a gap mode is generated, and the radiation efficiency is improved at the gap mode resonance position. The radiation efficiency in the B5 or N28 frequency band is still low.

[0089] As can be seen from the above, the folding of the electronic device 1000 has a greater impact on the efficiency of the low-frequency antenna. Therefore, in the N28 frequency band, the maximum drop is close to 10 dB.

[0090] The following is an example of the efficiency improvement of the low-frequency antenna of the electronic device 1000 in the folded state (with the cover closed).

[0091] It can be understood that the above is an example of the antenna assembly 100 being arranged on the first side edge 323. Correspondingly, the inventive concept of the antenna assembly 100 arranged on the second side edge 324 is the same as the inventive concept of the antenna assembly 100 arranged on the first side edge 323.

[0092] Please refer to Figures 9a-9f, the following through several groups of comparative experiments are carried out in the antenna assembly 100 first free end D, the first ground end A in the frame under the different location of the holding scene and the performance in the free space. The foldable electronic device is provided with six groups of antennas, which are respectively referred to as the first group of antennas 10a, the second group of antennas 10b, the third group of antennas 10c, the fourth group of antennas 10d, the fifth group of antennas 10e and the sixth group of antennas 10f.

[0093] Among them, the ground end of the first group of antennas 10a is located at the connection of the first side edge 323 and the bottom edge 322 (the left hand palm holding area Z1), and the free end is located at the open area Z3 of the bottom edge 322.

[0094] The ground end of the second group of antennas 10b is located at the area close to the bottom edge 322 of the first side edge 323 (the left hand palm holding area Z1), and the free end is located at the open area Z3 of the bottom edge 322.

[0095] The ground end of the third group of antennas 10c is located at the area close to the bottom edge 322 of the first side edge 323 (the left hand palm holding area Z1), and the free end is located at the open area Z3 of the bottom edge 322. The difference between this group of antennas and the second group of antennas 10b is that the part of the radiator on the first side edge 323 is increased, and the part on the bottom edge 322 is reduced.

[0096] The ground end of the fourth group of antennas 10d is located at the connection of the first side edge 323 and the bottom edge 322 (the palm holding area Z1), and the free end is located at the first side edge 323 (the left hand palm holding area Z1+ the finger overlapping area Z2 of the right hand).

[0097] The ground end of the fifth group of antennas 10e is located at the area close to the first side edge 323 of the bottom edge 322 (the open area Z3), and the free end is located at the first side edge 323 (the left hand palm holding area Z1+ the finger overlapping area Z2 of the right hand).

[0098] The sixth group of antennas 10f is a T-shaped antenna, two free ends are respectively located at the open area Z3 of the first side edge 323 and the bottom edge 322, and the ground end is located at the connection of the first side edge 323 and the bottom edge 322 (the left hand palm holding area Z1+ the finger overlapping area Z2 of the right hand).

[0099] Please refer to Table 1-1, Table 1-1 is the radiation efficiency of the six groups of antennas in the B28 frequency band under the conditions of folding (i.e. folding) free space, folding left hand holding, folding right hand holding.

[0100] Table 1-1

[0101]

[0102] Please refer to Table 1-2, Table 1-2 is the total efficiency of the six groups of antennas in the B28 frequency band under the conditions of folding (i.e. folding) free space, folding left hand holding, folding right hand holding.

[0103] Table 1-2

[0104]

[0105] As can be seen from Table 1-1 and Table 1-2, the first group of antennas 10a is substantially unobstructed in the right-hand holding, so the efficiency of the first group of antennas 10a in the right-hand holding is substantially consistent with the efficiency in the free space; in the left-hand holding, due to being partially located in the palm holding area Z1, it has a certain medium loading effect, so the efficiency is higher than that in the free space.

[0106] The second group of antennas 10b is substantially unobstructed in the right-hand holding, so the efficiency of the second group of antennas 10b in the right-hand holding is substantially consistent with the efficiency in the free space; in the left-hand holding, due to being partially located in the palm holding area Z1, it has a certain medium loading effect, so the efficiency is higher than that in the free space.

[0107] The third group of antennas 10c is substantially unobstructed in the right-hand holding, so the efficiency of the third group of antennas 10c in the right-hand holding is substantially consistent with the efficiency in the free space; in the left-hand holding, due to being partially located in the palm holding area Z1, it has a certain medium loading effect, so the efficiency is higher than that in the free space. And with the increase of the length of the antenna radiator located in the palm holding area Z1 in the left-hand holding scene, the efficiency improvement effect is more obvious.

[0108] The fourth group of antennas 10d to the sixth group of antennas 10f are fingered in the right-hand holding, so the efficiency of the fourth group of antennas 10d to the sixth group of antennas 10f in the right-hand holding decreases; in the left-hand holding, due to being partially located in the palm holding area Z1, it has a certain medium loading effect, so the efficiency is higher than that in the free space. And with the increase of the length of the antenna radiator located in the palm holding area Z1 in the left-hand holding scene, the efficiency improvement effect is more obvious.

[0109] Based on the need to ensure left-hand holding performance and right-hand holding performance, the above-mentioned first group of antennas 10a to the third group of antennas 10c to some extent meet the need to ensure left-hand holding performance and right-hand holding performance. Further, the second group of antennas 10b and the third group of antennas 10c have the ground end located below the right-hand overlapping area, the free end located in the open area Z3 of the bottom edge 322, and the target radiation segment 110 located in the palm holding area Z1 in the left-hand holding, so the medium loading effect is more and the antenna performance is better.

[0110] Please refer to Figure 10 , Figure 10is the S parameter, radiation efficiency, total efficiency curve of the third group of antennas 10c in the cover closed + free space, cover closed + left hand holding scene of the embodiment of the application. Among them, the curve a1 is the S parameter of the third group of antennas 10c in the cover closed + free space. The curve b1 is the radiation efficiency curve of the third group of antennas 10c in the cover closed + free space. The curve c1 is the total efficiency curve of the third group of antennas 10c in the cover closed + free space. The curve a2 is the S parameter of the third group of antennas 10c in the cover closed + left hand holding scene. The curve b2 is the radiation efficiency curve of the third group of antennas 10c in the cover closed + left hand holding scene. The curve c2 is the total efficiency curve of the third group of antennas 10c in the cover closed + left hand holding scene.

[0111] According to the curve a1 and the curve b1, the third group of antennas 10c supports the B28 frequency band in the cover closed + free space, cover closed + left hand holding scene. According to the curve a2 and the curve b2, the efficiency peak of the third group of antennas 10c in the cover closed + free space is located on the high frequency side of the B28 frequency band. The efficiency peak of the third group of antennas 10c in the cover closed + left hand holding scene is located in the B28 frequency band. In other words, compared with the cover closed + free space, the efficiency peak of the third group of antennas 10c in the cover closed + left hand holding scene moves to the low frequency side, so that the efficiency in the B28 frequency band is improved. The above is mainly because in the cover closed + left hand holding scene, the palm of the hand contacts the target radiation segment 110 of the antenna assembly 100, the palm has a dielectric loading effect on the antenna assembly 100, changes the equivalent dielectric constant around the radiator, causes the radiation efficiency peak to be low, and then makes the efficiency peak be located in the B28 frequency band.

[0112] Please refer to Figure 11 , Figure 11 is the S parameter, radiation efficiency, total efficiency curve of the third group of antennas 10c in the cover closed + free space, cover closed + right hand holding scene of the embodiment of the application. Among them, the curve a1 is the S parameter of the third group of antennas 10c in the cover closed + free space. The curve b1 is the radiation efficiency curve of the third group of antennas 10c in the cover closed + free space. The curve c1 is the total efficiency curve of the third group of antennas 10c in the cover closed + free space. The curve a2 is the S parameter of the third group of antennas 10c in the cover closed + right hand holding scene. The curve b2 is the radiation efficiency curve of the third group of antennas 10c in the cover closed + right hand holding scene. The curve c2 is the total efficiency curve of the third group of antennas 10c in the cover closed + right hand holding scene.

[0113] According to the curve a1 and the curve b1, the third group of antennas 10c supports the B28 frequency band in the cover closed + free space, cover closed + right hand holding scene. According to the curve a2 and the curve b2, the efficiency of the third group of antennas 10c in the cover closed + right hand holding scene is basically unchanged compared with the resonant bandwidth in the cover closed + free space, the resonance is slightly deepened, and the efficiency is basically unchanged.

[0114] The following is the efficiency comparison of the third group of antennas 10c under different hand contact in closed cover + left hand holding.

[0115] Please refer to Figure 12 , Figure 12 The S parameter and efficiency curves of the third group of antennas 10c in closed cover + free space, closed cover + left hand holding, closed cover + left hand holding without the thumb, closed cover + left hand holding with only the thumb, and closed cover + left hand holding with only the left hand palm are provided in the embodiments of the present application.

[0116] Among them, curve a1 is the S parameter curve of the third group of antennas 10c in closed cover + free space. Curve b1 is the S parameter curve of the third group of antennas 10c in closed cover + left hand holding. Curve c1 is the S parameter curve of the third group of antennas 10c in closed cover + left hand holding without the thumb. Curve d1 is the S parameter curve of the third group of antennas 10c in closed cover + left hand holding with only the thumb. Curve e1 is the S parameter curve of the third group of antennas 10c in closed cover + left hand holding with only the left hand palm. Curve a2 is the radiation efficiency curve of the third group of antennas 10c in closed cover + free space. Curve b2 is the radiation efficiency curve of the third group of antennas 10c in closed cover + left hand holding. Curve c2 is the radiation efficiency curve of the third group of antennas 10c in closed cover + left hand holding without the thumb. Curve d2 is the radiation efficiency curve of the third group of antennas 10c in closed cover + left hand holding with only the thumb. Curve e2 is the radiation efficiency curve of the third group of antennas 10c in closed cover + left hand holding with only the left hand palm.

[0117] Among them, the S parameter and radiation efficiency curves of the third group of antennas 10c in closed cover + free space are basically coincided with the S parameter and radiation efficiency curves of the third group of antennas 10c in closed cover + left hand holding with only the thumb, indicating that the thumb has basically no effect on the S parameter and radiation efficiency under left hand holding.

[0118] The S parameter and radiation efficiency curves of the third group of antennas 10c in closed cover + left hand holding are basically coincided with the S parameter and radiation efficiency curves of the third group of antennas 10c in closed cover + left hand holding without the thumb.

[0119] The comparison of the S parameter and radiation efficiency curves of the third group of antennas 10c in closed cover + free space and the S parameter and radiation efficiency curves of the third group of antennas 10c in closed cover + left hand holding can be seen that after the left hand palm forms a dielectric loading, the efficiency peak moves to the B28 frequency band or nearby, the efficiency and bandwidth of the B28 frequency band are greatly improved, and the whole left hand holding still shows efficiency improvement.

[0120] The S-parameter and radiation efficiency curves of the third group of antennas 10c in the closed lid + left hand holding mode and the S-parameter and radiation efficiency curves of the third group of antennas 10c in the closed lid + left hand holding mode with only the left hand palm can be compared. It can be seen that the left hand holding mode with only the left hand palm has more efficiency improvement.

[0121] Please refer to Figure 13 The target radiation section 110 includes a first radiation section 110a and a second radiation section 110b. The first radiation section 110a includes the first ground end A. The second radiation section 110b includes the first feeding point B. The length of the first radiation section 110a and the second radiation section 110b is not specifically limited in the present application. The first feeding point B and the first ground end A are both current strong points, so the area near the first ground end A is a current strong area, and the area near the first feeding point B is a current strong area. By arranging the first radiation section 110a and / or the second radiation section 110b in the palm holding area Z1 of the left hand holding mode, the palm forms a dielectric loading effect at the first radiation section 110a and / or the second radiation section 110b, thereby improving the radiation efficiency of the left hand holding mode.

[0122] Optionally, please refer to Figure 14 The first feeding point B is located between the midpoint of the first radiator 11 and the first ground end A. In this way, the first radiator 11 and the first signal source 12 form an IFA antenna. The current mode of the first resonance mode is an IFA current mode. In the IFA current mode, the first radiation section 110a and the second radiation section 110b are continuous, and the part between the first ground end A and the first feeding point B is a strong current section. Further, in the IFA current mode, the part from the first ground end A to the position at 3 / 4 of the length of the first radiator 11 is a strong current section.

[0123] The present embodiment arranges the first feeding point B close to the first ground end A, so that the current mode of the first resonance mode is an IFA current mode, thereby forming a longer strong current section on the first radiator 11, and the left hand palm contacts more strong current sections, the dielectric loading effect is more, and the efficiency improvement effect is more obvious.

[0124] Optionally, please refer to Figure 15 The electrical length between the first ground end A and the first free end D is close to 1 / 4 wavelength of the center frequency point of the first frequency band, and the first resonance mode forms a 1 / 4 wavelength mode supporting the first frequency band between the first ground end A and the first free end D.

[0125] The antenna assembly 100 in the embodiment of the present application is an IFA antenna. The 1 / 4 wavelength mode is the ground state mode of the IFA antenna. At this time, the antenna assembly 100 has higher radiation efficiency in the first frequency band.

[0126] The electrical length described in the present application can satisfy the following formula:

[0127]

[0128] Wherein, L is the physical length, a is the transmission time of the electrical or electromagnetic signal in the medium, and b is the transmission time in free space.

[0129] Further, referring to Figure 15 , the first feeding point B can be arranged at the first side edge 323. Since the first grounding end A is located at the first side edge 323, and the distance between the first grounding end A and the bottom edge 322 is less than or equal to 20 mm, the distance between the first grounding end A and the first feeding point B is less than 20 mm. Since the first frequency band is the LB frequency band less than 900 MHz, that is, the first feeding point B is located between the midpoint of the first radiator 11 and the first grounding end A. Therefore, the first feeding point B is arranged at the first side edge 323, which realizes that the antenna assembly 100 is an IFA antenna, so as to form a longer strong current section and form more medium loading effects when holding in the palm.

[0130] In other embodiments, referring to Figure 16 , the first feeding point B can also be arranged between the midpoint of the first radiator 11 and the first free end D. Further, the position of the first feeding point B can also be arranged at the position of 1 / 4 total length of the first free end D on the first radiator 11. At this time, the first resonance mode is a left-handed mode (CRLH mode). The current distribution of this mode is shown in Figure 16 . In the present embodiment, the first radiation section 110a is formed between the first grounding end A and the midpoint of the first radiator 11, and the second radiation section 110b is formed near the first feeding point B. The first radiation section 110a and the second radiation section 110b are spaced apart. When the palm contacts the first radiation section 110a and the second radiation section 110b in the left-handed holding, a certain medium loading can also be formed to improve the efficiency.

[0131] Referring to Table 1-3, Table 1-3 is the efficiency comparison of the third group of antennas 10c provided by the present application in the scenarios of closed cover + free space, closed cover + left-handed holding and closed cover + right-handed holding when forming IFA mode and left-handed mode respectively. As can be seen from Table 1-3, in the scenario of closed cover + free space, the left-handed mode (CRLH) has reduced efficiency due to the current zero point and reverse current. In the scenario of closed cover + left-handed holding, the radiation efficiency is improved due to the medium loading effect of the palm, so that the efficiency in the left-handed holding scenario is higher than that in the closed cover + free space. In the scenario of closed cover + right-handed holding, the left-handed mode (CRLH) has reduced efficiency due to the lack of medium loading or medium loading effect, and the current zero point and reverse current.

[0132] Table 1-3

[0133]

[0134] The following inventive concept is exemplified by taking the antenna assembly 100 as an IFA antenna.

[0135] Optionally, the antenna assembly 100 further comprises a first matching circuit M1. The first matching circuit M1 is electrically connected between the first feeding point B and the first signal source 12. The first matching circuit M1 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 first matching circuit M1 comprises at least one of a capacitor and an inductor. Further, the first matching circuit M1 further comprises a switch selection circuit, which is used to select the device (inductor and / or capacitor) with different impedance to work, so as to adjust the electrical length of the first radiator 11, change the aperture of the first radiator 11, adjust the electrical length of the first radiator 11, and switch the sub-band of the first frequency band. For example, switching from the B28 frequency band to the B5 frequency band, etc. Of course, the switch selection circuit can also be electrically connected to the position between the first feeding point B and the first free end D of the first radiator 11.

[0136] In summary, the electronic device 1000 provided by the embodiment of the present application designs the first free end D, the first feeding end, the position of the strong current section, and the position of the first ground end A of the antenna assembly 100. Specifically, the first free end D of the antenna assembly 100 is arranged at the open area Z3 of the bottom edge 322, so as to avoid the hand holding the first free end D in the holding scenario; the first feeding point B is arranged at a position relatively close to the first ground end A, so as to form an IFA antenna, which has higher efficiency in the closed scenario; the strong current section is arranged at the palm holding area Z1 in the holding scenario, so as to facilitate the palm to load the strong current section on the antenna with dielectric loading, and improve the radiation efficiency of the lower frequency band by using dielectric loading; and the first ground end A is arranged below the finger overlapping area Z2, so as to reduce the influence of hand holding performance. The above designs realize the dielectric loading of the palm in the left-hand holding scenario, improve the performance, and realize that the first ground end A is away from the fingers in the right-hand holding scenario, so that the performance is not reduced or reduced little, which balances the holding performance of the left and right hands, and forms an anti-folding and anti-hand holding low-frequency antenna.

[0137] Please refer to Figure 17 , Figure 17 is the radiation efficiency curve and total efficiency curve of the antenna assembly 100 provided by the embodiment of the present application in the folding+right-hand holding, folding+free space, and folding+left-hand holding scenarios.

[0138] The curve a1 is the radiation efficiency curve of the antenna assembly 100 in the folding+right-hand holding scenario. The curve b1 is the radiation efficiency curve of the antenna assembly 100 in the folding+free space scenario. The curve c1 is the radiation efficiency curve of the antenna assembly 100 in the folding+left-hand holding scenario.

[0139] Curve a2 is the radiation efficiency curve of the antenna assembly 100 in the folded + right-hand holding. Curve b2 is the radiation efficiency curve of the antenna assembly 100 in the folded + free space. Curve c2 is the radiation efficiency curve of the antenna assembly 100 in the folded + left-hand holding.

[0140] It can be known that in the left-hand holding scenario, the palm forms a medium load, the performance is improved, and in the right-hand holding scenario, the first grounding end A is away from the fingers, the performance is not reduced or less reduced, the performance of the left and right hand holding is balanced, and the low-frequency antenna against folding and hand holding is formed.

[0141] Please refer to Figure 18 , Figure 18 is the radiation efficiency, total efficiency curve of the antenna assembly 100 provided by the embodiment of the application in the folded + right-hand holding, folded + right-hand holding close to the head, folded + free space scenario.

[0142] Curve a1 is the radiation efficiency curve of the antenna assembly 100 in the folded + right-hand holding. Curve b1 is the radiation efficiency curve of the antenna assembly 100 in the folded + right-hand holding close to the head. Curve c1 is the radiation efficiency curve of the antenna assembly 100 in the folded + free space.

[0143] Curve a2 is the total efficiency curve of the antenna assembly 100 in the folded + right-hand holding. Curve b2 is the total efficiency curve of the antenna assembly 100 in the folded + right-hand holding close to the head. Curve c2 is the total efficiency curve of the antenna assembly 100 in the folded + free space.

[0144] Please refer to Figure 19 , Figure 19 is the radiation efficiency, total efficiency curve of the antenna assembly 100 provided by the embodiment of the application in the folded + free space, folded + left-hand holding, folded + left-hand holding close to the head scenario.

[0145] Curve a1 is the radiation efficiency curve of the antenna assembly 100 in the folded + free space. Curve b1 is the radiation efficiency curve of the antenna assembly 100 in the folded + left-hand holding. Curve c1 is the radiation efficiency curve of the antenna assembly 100 in the folded + left-hand holding close to the head scenario.

[0146] Curve a2 is the total efficiency curve of the antenna assembly 100 in the folded + free space. Curve b2 is the total efficiency curve of the antenna assembly 100 in the folded + left-hand holding. Curve c2 is the total efficiency curve of the antenna assembly 100 in the folded + left-hand holding close to the head scenario.

[0147] Please refer to Figure 20 , Figure 20 is the radiation efficiency, total efficiency curve of the antenna assembly 100 provided by the embodiment of the application in the unfolded free space in the B8 frequency band and the B28 frequency band.

[0148] Curve a1 is the radiation efficiency curve of the antenna assembly 100 at the B8 frequency band in the unfolded free space. Curve b1 is the radiation efficiency curve of the antenna assembly 100 at the B28 frequency band in the unfolded free space.

[0149] Curve a2 is the total efficiency curve of the antenna assembly 100 at the B8 frequency band in the unfolded free space. Curve b2 is the total efficiency curve of the antenna assembly 100 at the B28 frequency band in the unfolded free space.

[0150] Please refer to Table 1-4, which is the radiation efficiency of the antenna assembly 100 at the B8 frequency band and the B28 frequency band in the unfolded free space, the folded free space, the folded+left-hand handheld, the folded+right-hand handheld, the folded+left-hand handheld close to the head, and the folded+right-hand handheld close to the head provided in the embodiments of the present application. It can be known that the efficiency of the antenna assembly 100 provided in the embodiments of the present application at the B8 frequency band and the B28 frequency band in the unfolded free space, the folded free space, the folded+left-hand handheld, the folded+right-hand handheld, the folded+left-hand handheld close to the head, and the folded+right-hand handheld close to the head is relatively good.

[0151] Table 1-4

[0152]

[0153] In the embodiments, please refer to Figure 21 The antenna assembly 100 further includes a second radiator 22. The second radiator 22 is arranged on the bottom edge 322. The second radiator 22 includes a second free end E and a second ground end G arranged in sequence. The second free end E and the first free end D are coupled by a coupling gap.

[0154] The electrical length of the second radiator 22 is less than the electrical length of the first radiator 11. The second radiator 22 acts as a parasitic radiator of the first radiator 11. And the first signal source 12 excites the second radiator 22 to form a resonance, and the resonance on the first radiator 11 and the resonance on the second radiator 22 form a dual-wave resonance supporting the first frequency band, so as to improve the efficiency of the first frequency band. For the problem of efficiency reduction of the low-frequency antenna of the foldable electronic device 1000 after folding, the radiation efficiency of the foldable electronic device after folding can be improved by arranging the second radiator 22.

[0155] The first resonance mode includes a third sub-mode and a fourth sub-mode. The third sub-mode and the fourth sub-mode have different resonance current distributions. The third sub-mode and the fourth sub-mode exist simultaneously, and each of the third sub-mode and the fourth sub-mode forms a resonance to form a dual-wave resonance. That is, the third sub-mode and the fourth sub-mode are dual-wave resonances supporting the first frequency band.

[0156] Specifically, please refer to Figure 22, the resonant current of the third sub-mode includes a fifth sub-current Q5 formed between the first ground end A and the first free end D, and a sixth sub-current Q6 formed between the second free end E and the second ground end G. The current intensity of the fifth sub-current Q5 is greater than the current intensity of the sixth sub-current Q6. The current direction of the fifth sub-current Q5 is the same as the current direction of the sixth sub-current Q6. For example, the fifth sub-current Q5 flows from the first ground end A to the first free end D, and the sixth sub-current Q6 flows from the second free end E to the second ground end G. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0157] , the fourth sub-mode forms a 1 / 4 wavelength mode supporting the fourth sub-band between the second free end E and the second ground end G.

[0158] Specifically, the resonant current on the first ground end A and the first free end D in the third sub-mode is the part that mainly contributes to the radiation energy. Wherein, the electrical length between the first ground end A and the first free end D is about 1 / 4 wavelength of the third sub-band, and the resonant current on the first ground end A and the first free end D works in the 1 / 4 wavelength mode of the third sub-band.

[0159] Please refer to Figure 23 , the resonant current of the fourth sub-mode includes a seventh sub-current Q7 formed between the first ground end A and the first free end D, and an eighth sub-current Q8 formed between the second free end E and the second ground end G. The current intensity of the eighth sub-current Q8 is greater than the current intensity of the seventh sub-current Q7. The current direction of the eighth sub-current Q8 is opposite to the current direction of the seventh sub-current Q7. For example, the seventh sub-current Q7 flows from the first ground end A to the first free end D, and the eighth sub-current Q8 flows from the second ground end G to the second free end E. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0160] , the fourth sub-mode forms a 1 / 4 wavelength mode supporting the fourth sub-band between the second free end E and the second ground end G.

[0161] Specifically, the resonant current on the second ground end G and the second free end E in the fourth sub-mode is the part that mainly contributes to the radiation energy. Wherein, the electrical length between the second ground end G and the second free end E is about 1 / 4 wavelength of the fourth sub-band, and the resonant current on the second ground end G and the second free end E works in the 1 / 4 wavelength mode of the fourth sub-band.

[0162] The electrical length between the second ground end G and the second free end E is less than the electrical length between the first ground end A and the first free end D. The fourth sub-frequency band has a center frequency greater than the center frequency of the third sub-frequency band. The third sub-frequency band and the fourth sub-frequency band are continuous and form the first frequency band. For example, the high frequency side band of the third sub-frequency band and the low frequency side band of the fourth sub-frequency band at least partially overlap to form a continuous frequency band. The continuous frequency band covers the first frequency band. For example, the first frequency band is N28 (703-803 MHz) in the LB frequency band, the third sub-frequency band is 680-750 MHz, and the fourth sub-frequency band is 740-810 MHz. These data are only examples.

[0163] Briefly, the first signal source 12 excites the first radiator 11 and the second radiator 22 to generate a third sub-mode of resonant current, wherein the third sub-mode has the same direction current on the first radiator 11 and the second radiator 22, and the third sub-mode of resonant current and the floor current on the reference floor form a current loop. The third sub-mode is also called a radiation mode. The radiation mode is a mode dependent on the participation of the reference floor. At the same time, the first signal source 12 also excites the first radiator 11 and the second radiator 22 to generate a fourth sub-mode of resonant current, wherein the fourth sub-mode has the opposite direction current on the first radiator 11 and the second radiator 22, and the fourth sub-mode is also called a balance mode. The balance mode is relatively a mode independent of the participation of the reference floor.

[0164] When the frequency band supported by the balance mode is located on the high frequency side of the frequency band supported by the radiation mode, and the frequency band supported by the balance mode is close to the frequency band supported by the radiation mode, the balance mode can produce an efficiency enhancement effect (from the efficiency curve, the balance mode can form an efficiency convex on the high frequency side of the frequency band of the radiation mode) to improve the in-band efficiency of the radiation mode, that is, to improve the in-band efficiency of the first frequency band.

[0165] Optionally, the difference between the center frequency of the fourth sub-frequency band and the center frequency of the third sub-frequency band is less than or equal to 1 GHz.

[0166] For foldable electronic devices, the reduction of the reference floor after folding, the handheld absorption and the like cause the efficiency of the low frequency band to decrease more. The embodiments of the present application design the positions of the ground end, the free end and the feed point of the antenna assembly 100 to avoid handheld absorption and promote dielectric loading to improve the efficiency. Further, the second radiator 22 is arranged to form the radiation mode and the balance mode of the E-E mode to further improve the radiation efficiency of the low frequency antenna in the foldable electronic device after folding, so as to ensure the stable talk function of the foldable electronic device.

[0167] Wherein, please refer to Figure 24, the third sub-mode is the main mode in the third and fourth sub-modes, and therefore the specific size of the resonant frequency point of the fourth sub-mode has little effect on the third sub-mode, and therefore the electrical length of the second radiator 22 is not specifically limited. For example, the ground end of the second radiator 22 can be arranged at the bottom edge 322, or can be arranged at the second side edge 324. Further, the antenna assembly 100 further comprises a second tuning circuit T2 electrically connected between the second ground end G and the second free end E. The second tuning circuit T2 comprises a ground capacitor and / or a ground inductor to adjust the electrical length of the second radiator 22. For example, the second tuning circuit T2 is a ground capacitor to increase the electrical length of the second radiator 22, so as to shorten the physical length of the second radiator 22 and reduce the space occupied by the second radiator 22.

[0168] The embodiment is based on the foregoing embodiment, and refers to Figure 25 , the second radiator 22 further comprises a second feeding point F between the second ground end G and the second free end E. The second feeding point F can be arranged close to the second ground end G.

[0169] The antenna assembly 100 further comprises a second signal source 21. The second signal source 21 is electrically connected to the second feeding point F to excite the second radiator 22 to form a second resonant mode supporting a second frequency band. At this time, the second signal source 21 and the second radiator 22 form an IFA antenna.

[0170] Optionally, the antenna assembly 100 further comprises a second matching circuit M2. The second matching circuit M2 is electrically connected between the second feeding point F and the second signal source 21. The second matching circuit M2 is used to adjust the impedance matching between the port of the second signal source 21 and the port of the second radiator 22. The second matching circuit M2 comprises at least one of a capacitor and an inductor. Further, the second matching circuit M2 further comprises a switch selection circuit, which is used to select different impedance devices (inductors and / or capacitors) to work, so as to adjust the electrical length of the second radiator 22, change the aperture of the second radiator 22, adjust the electrical length of the second radiator 22, and switch the sub-band of the second frequency band.

[0171] Referring to Figure 25 , the resonant current of the second resonant mode is distributed between the second ground end G and the second free end E. The electrical length between the second ground end G and the second free end E is close to 1 / 4 wavelength of the second frequency band, and the second resonant mode is a 1 / 4 wavelength mode of the second frequency band.

[0172] The first frequency band and the second frequency band are different frequency bands. For example, the first frequency band is an LB frequency band (less than 1 GHz). The second frequency band includes, but is not limited to, an MHB frequency band (1-3 GHz), an UHB frequency band (more than 3 GHz), a Wi-Fi 2.4G frequency band, a Wi-Fi 5G frequency band, and the like. In this embodiment, the second frequency band is taken as the MHB frequency band, so that the antenna assembly 100 of this embodiment can support the LB frequency band + the MHB frequency band at the same time.

[0173] In this embodiment, the first radiator 11 and the first signal source 12 are taken as the LB antenna, and the second radiator 22 and the second signal source 21 are taken as the MHB antenna, so that the efficiency of the LB frequency band is improved, and the LB frequency band + the MHB frequency band can be supported at the same time.

[0174] Further, referring to Figure 26 , the first radiator 11 further includes a tuning point C. The tuning point C is located on the bottom edge 322. The tuning point C is located on the side of the first free end D away from the second free end E. Further, the tuning point C is located between the first free end D and the first feeding point B.

[0175] Referring to Figure 26 , the antenna assembly 100 further includes a first tuning circuit T1. One end of the first tuning circuit T1 is electrically connected to the tuning point C, and the other end of the first tuning circuit T1 is grounded. The first tuning circuit T1 is used to make the resonant current of the second resonant mode grounded.

[0176] In other words, the current of the second resonant mode is distributed not only on the second radiator 22, but also between the first free end D, the tuning point C, and the first tuning circuit T1.

[0177] Specifically, the first tuning circuit T1 is a band-pass circuit for the second frequency band and a band-stop circuit for the second frequency band. That is, the first tuning circuit T1 makes the current of the second resonant mode grounded, and is in an open circuit state for the current of the first resonant mode. For example, the first frequency band is the LB frequency band, and the second frequency band is the MHB frequency band. The first tuning circuit T1 is a small capacitance grounded, and the capacitance value of the small capacitance is less than 2 pF.

[0178] Further, the electrical length between the tuning point C and the first free end D is less than the electrical length between the second ground end G and the second free end E. The first radiator 11 between the tuning point C and the first free end D acts as a parasitic radiator of the second radiator 22. And the second signal source 21 excites the first radiator 11 between the tuning point C and the first free end D to form a resonance, and the resonance on the first radiator 11 between the tuning point C and the first free end D and the resonance on the second radiator 22 form a dual-wave resonance supporting the second frequency band, so as to improve the efficiency of the second frequency band. For the problem of the efficiency of the MHB antenna of the electronic device 1000 decreasing after folding, the first tuning circuit T1 is connected on the first radiator 11, the resonance current path of the second resonance mode is changed, more resonance modes are generated, the LB antenna is reused, and the radiation efficiency of the MHB antenna after folding is also improved.

[0179] The second resonance mode includes a first sub-mode and a second sub-mode. The resonance current distributions of the first sub-mode and the second sub-mode are different. The first sub-mode and the second sub-mode exist at the same time, and each forms a resonance to form a dual-wave resonance. That is, the first sub-mode and the second sub-mode are dual-wave resonances supporting the second frequency band.

[0180] Specifically, please refer to Figure 26 The resonance current of the first sub-mode includes a first sub-current Q1 formed between the second ground end G and the second free end E, and a second sub-current Q2 formed between the first free end D and the tuning point C. The current intensity of the first sub-current Q1 is greater than that of the second sub-current Q2. The current directions of the first sub-current Q1 and the second sub-current Q2 are the same. For example, the first sub-current Q1 flows from the second ground end G to the second free end E, and the second sub-current Q2 flows from the first free end D to the tuning point C. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0181] The first sub-mode forms a 1 / 4 wavelength mode supporting a first sub-frequency band between the second ground end G and the second free end E.

[0182] Specifically, the resonance current on the second ground end G and the second free end E in the first sub-mode is the main part of the radiation energy. The electrical length between the second ground end G and the second free end E is about 1 / 4 wavelength of the first sub-frequency band, and the resonance current on the second ground end G and the second free end E works in the 1 / 4 wavelength mode of the first sub-frequency band.

[0183] Please refer to Figure 27The resonant current of the second sub-mode includes a third sub-current Q3 formed between the second ground end G and the second free end E, and a fourth sub-current Q4 formed between the first free end D and the tuning point C. The current intensity of the fourth sub-current Q4 is greater than that of the third sub-current Q3. The current direction of the fourth sub-current Q4 is opposite to that of the third sub-current Q3. For example, the third sub-current Q3 flows from the second ground end G to the second free end E, and the fourth sub-current Q4 flows from the first tuning circuit T1, the tuning point C to the first free end D. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0184] The second sub-mode forms a 1 / 4 wavelength mode supporting a second sub-band between the first free end D and the tuning point C.

[0185] Specifically, the resonant current on the first free end D and the tuning point C in the second sub-mode is the part that mainly contributes to the radiation energy. The electrical length between the first free end D and the tuning point C is about 1 / 4 wavelength of the second sub-band, and the resonant current on the first free end D and the tuning point C works in the 1 / 4 wavelength mode of the second sub-band.

[0186] The electrical length between the first free end D and the tuning point C is less than the electrical length between the second ground end G and the second free end E. The center frequency of the second sub-band is greater than the center frequency of the first sub-band. The first sub-band and the second sub-band are continuous and form the second frequency band. For example, the high frequency side band of the first sub-band and the low frequency side band of the second sub-band at least partially overlap to form a continuous frequency band. The continuous frequency band covers the second frequency band. For example, the second frequency band is B41 (2496-2690MHz) in the MHB frequency band, the first sub-band is 2300-2600MHz, and the second sub-band is 2500-2800MHz. This data is only an example.

[0187] In short, the second signal source 21 excites the first free end D and the tuning point C between the first radiator 11 and the second radiator 22 to generate a resonant current of the first sub-mode, wherein the current on the first radiator 11 and the second radiator 22 between the first free end D and the tuning point C in the first sub-mode is a same direction current, the resonant current of the first sub-mode and the floor current on the reference floor form a current loop, and the first sub-mode is also called a radiation mode. The radiation mode is a mode that depends on the participation of the reference floor. At the same time, the second signal source 21 also excites the first free end D and the tuning point C between the first radiator 11 and the second radiator 22 to generate a resonant current of the second sub-mode, wherein the current on the first radiator 11 and the second radiator 22 between the first free end D and the tuning point C in the second sub-mode is a reverse current, and the second sub-mode is also called a balance mode. The balance mode is relatively a mode that does not depend on the participation of the reference floor.

[0188] When the frequency band supported by the balanced mode is located on the high frequency side of the frequency band supported by the radiation mode, and the frequency band supported by the balanced mode is close to the frequency band supported by the radiation 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 of the radiation mode) to improve the in-band efficiency of the radiation mode, that is, to improve the in-band efficiency of the second frequency band.

[0189] Optionally, the difference between the center frequency of the second sub-band and the center frequency of the first sub-band is less than or equal to 1 GHz.

[0190] For foldable electronic devices, the reduction of the reference floor after folding, the handheld absorption and the like cause the efficiency of the medium-high frequency band to decrease more. The embodiments of the present application design the positions of the ground end, the free end and the feed point of the antenna assembly 100 to avoid handheld absorption and promote dielectric loading to improve efficiency. Further, the second radiator 22 is arranged to form a radiation mode and a balanced mode in E-E mode to further improve the radiation efficiency of the medium-high frequency antenna in the folded state of the foldable electronic device, so as to ensure the stable call function of the foldable electronic device.

[0191] Among the first sub-mode and the second sub-mode, the first sub-mode is the main one, so the specific size of the resonance frequency point of the second sub-mode has little effect on the first sub-mode after meeting the requirements. Therefore, the present application does not make specific limitations on the electrical length of the second radiator 22.

[0192] Please refer to Figure 28 and Figure 29 , the electronic device 1000 is a foldable electronic device. 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. The first body 10 includes a top edge. The top edge includes a first end and a second end arranged oppositely. The second body 20 includes a bottom edge 322. When the electronic device 1000 is in the unfolded state, the top edge 321 and the bottom edge 322 are located on opposite sides of the electronic device 1000, respectively. When the electronic device 1000 is in the folded state, the top edge 321 and the bottom edge 322 overlap in the thickness direction.

[0193] Please refer to Figure 30The antenna assembly 100 further comprises a third radiator 33 and a third signal source 31. The third radiator 33 is disposed on the top edge 321. The third radiator 33 comprises a third free end H, a third feed point J and a third ground end K disposed in sequence. The third signal source 31 is electrically connected to the third feed point J to excite the third radiator 33 to generate a third resonant mode supporting a third frequency band.

[0194] Optionally, referring to Figure 30 The antenna assembly 100 further comprises a third matching circuit M3. The third matching circuit M3 is electrically connected between the third feed point J and the third signal source 31. The third matching circuit M3 is configured to adjust the impedance matching between the port of the third signal source 31 and the port of the third radiator 33. The third matching circuit M3 comprises at least one of a capacitor and an inductor. Further, the third matching circuit M3 further comprises a switch selection circuit configured to select a device (inductor and / or capacitor) with different impedance to work to adjust the electrical length of the third radiator 33, thereby changing the aperture of the third radiator 33, adjusting the electrical length of the third radiator 33, and switching the sub-frequency band of the third frequency band.

[0195] Optionally, the third frequency band includes, but is not limited to, an LB frequency band, an MHB frequency band, a UHB frequency band, a Wi-Fi 2.4G frequency band, a Wi-Fi 5G frequency band, a GPS frequency band, etc. In this embodiment, the third frequency band is taken as the GPS frequency band as an example.

[0196] The third radiator 33 and the third signal source 31 form an IFA antenna, and the electrical length between the third ground end K and the third free end H is close to 1 / 4 wavelength of the third frequency band. When the electronic device 1000 is in the unfolded state, the third resonant mode forms a 1 / 4 wavelength mode supporting the third frequency band between the third ground end K and the third free end H.

[0197] Optionally, referring to Figure 31 When the electronic device 1000 is in the folded state, the direction in which the third ground end K points to the third free end H is opposite to the direction in which the second ground end G points to the second free end E. In the thickness direction of the electronic device 1000, the third radiator 33 and the second radiator 22 at least partially face each other and are coupled. Further, the orthographic projection of the third ground end K on the second radiator 22 is located between the second ground end G and the second free end E, and the orthographic projection of the second free end E on the third radiator 33 is located between the third ground end K and the third free end H. Optionally, the relative length between the second radiator 22 and the third radiator 33 is close to half of the length of the second radiator 22. Further, the relative length between the second radiator 22 and the third radiator 33 is (1 / 2-1) times the length of the second radiator 22.

[0198] Specifically, the third resonance mode includes a fifth sub-mode and a sixth sub-mode when the electronic device 1000 is in the folded state. The fifth sub-mode and the sixth sub-mode have different resonance current distributions. The fifth sub-mode and the sixth sub-mode exist simultaneously, and each of the fifth sub-mode and the sixth sub-mode forms a resonance to form a double-wave resonance. That is, the fifth sub-mode and the sixth sub-mode are double-wave resonances that support the third frequency band.

[0199] Referring to FIG. 10, Figure 32 the fifth sub-mode forms a ninth sub-current Q9 between the third ground end K and the third free end H, and a tenth sub-current Q10 between the second free end E and the second ground end G. The ninth sub-current Q9 has a current intensity greater than that of the tenth sub-current Q10. The ninth sub-current Q9 has the same current direction as the tenth sub-current Q10. For example, the ninth sub-current Q9 flows from the third ground end K to the third free end H, and the tenth sub-current Q10 flows from the second free end E to the second ground end G. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0200] The fifth sub-mode forms a 1 / 4 wavelength mode that supports a fifth sub-frequency band between the third ground end K and the third free end H.

[0201] Specifically, the resonance current on the third ground end K and the third free end H in the fifth sub-mode is the main contribution to the radiation energy. The electrical length between the third ground end K and the third free end H is approximately 1 / 4 wavelength of the fifth sub-frequency band, and the resonance current on the third ground end K and the third free end H operates in the 1 / 4 wavelength mode of the fifth sub-frequency band.

[0202] Referring to FIG. 10, Figure 33 the sixth sub-mode forms an eleventh sub-current Q11 between the second free end E and the second ground end G, and a twelfth sub-current Q12 between the third ground end K and the third free end H. The twelfth sub-current Q12 has a current intensity greater than that of the eleventh sub-current Q11. The twelfth sub-current Q12 has an opposite current direction to that of the eleventh sub-current Q11. For example, the eleventh sub-current Q11 flows from the third ground end K to the third free end H, and the twelfth sub-current Q12 flows from the second ground end G to the second free end E. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0203] The sixth sub-mode forms a 1 / 4 wavelength mode that supports a sixth sub-frequency band between the second ground end G and the second free end E.

[0204] Specifically, the resonant current on the second ground end G and the second free end E in the sixth sub-mode mainly contributes to the radiation energy. The electrical length between the second ground end G and the second free end E is about 1 / 4 wavelength of the sixth sub-band, and the resonant current on the second ground end G and the second free end E works in the 1 / 4 wavelength mode of the sixth sub-band.

[0205] The electrical length between the second ground end G and the second free end E is less than the electrical length between the third ground end K and the third free end H. The center frequency of the sixth sub-band is greater than the center frequency of the fifth sub-band. The sixth sub-band is continuous with the fifth sub-band and forms the third frequency band. For example, the high frequency side band of the sixth sub-band at least partially overlaps the low frequency side band of the fifth sub-band to form a continuous frequency band. The continuous frequency band covers the third frequency band. For example, the third frequency band is the GPS-L1 frequency band (1575 MHz), the fifth sub-band is 1500-1600 MHz, and the sixth sub-band is 1550-1650 MHz. These data are only examples.

[0206] The difference between the third resonant mode in the embodiment and the second resonant mode in the third embodiment at least includes that the second resonant mode formed by the first radiator 11 and the second radiator 22 in the third embodiment is a resonant mode formed with a common reference ground plate, while the third resonant mode in the embodiment is a resonant mode formed without a common reference ground plate.

[0207] Optionally, the difference between the center frequency of the sixth frequency band and the center frequency of the fifth sub-band is less than or equal to 1 GHz.

[0208] The application sets the second radiator 22 as a parasitic branch of the third radiator 33, and the sixth sub-mode and the fifth sub-mode form a double-wave resonant mode, wherein the fifth sub-mode can improve the in-band efficiency and efficiency bandwidth of the sixth sub-mode. The second radiator 22 can also support the MHB frequency band, so that the antenna assembly 100 can support the GPS frequency band + MHB frequency band + LB frequency band, improve the efficiency of the LB frequency band, MHB frequency band and GPS frequency band when folding, and realize the functions of folding call and folding navigation of the electronic device 1000. The multiplexing of the second radiator 22 increases the functions of the antenna assembly 100 while reducing the space occupied by the antenna assembly 100.

[0209] Please refer to Figure 34The distance between the third free end H and the first end 321a is less than the distance between the third free end H and the second end 321b. The distance L1 between the third free end H and the first end 321a is greater than or equal to a first preset distance. The first preset distance is used to avoid the thumb when the electronic device 1000 is in a handheld folded state, so as to avoid the left thumb covering the third free end H. For example, the first preset distance is about 10 mm.

[0210] Please refer to Figure 34 The distance L2 between the third ground end K and the second end 321b is greater than or equal to the first preset distance, which is used to avoid the thumb when the electronic device 1000 is in a handheld folded state, so as to avoid the right thumb covering the third ground end K. Through the above design, the frequency deviation of the electronic device 1000 when being held in a folded state can be effectively avoided, the frequency band stability of the electronic device 1000 when being held in a folded state is improved, especially the stability of the GPS signal, and the cover navigation function is realized.

[0211] Further, the distance between the third ground end K and the midpoint of the top edge 321 is less than or equal to a second preset distance. The second preset distance is not limited in the present application, and is optionally less than or equal to 10 mm. For example, the second preset distance is 5 mm, 4 mm, 3 mm, 2 mm, 1 mm, 0 mm, etc.

[0212] The third ground end K is close to the midpoint of the top edge 321, and the first radiator 11 forms less transverse (X-axis direction) mode current and more longitudinal mode (Y-axis direction) current on the reference floor when generating a resonant current, and the longitudinal mode current can more effectively improve the radiation efficiency of the GPS frequency band.

[0213] The distance between the second ground end G and the third end is greater than or equal to the first preset distance.

[0214] Please refer to Figure 34The bottom side 322 includes a third end 322a and a fourth end 322b opposite to each other. When the electronic device 1000 is in the folded state, the third end 322a is opposite to the first end 321a in the thickness direction, and the fourth end 322b is opposite to the second end 321b in the thickness direction. The distance between the second ground end G and the third end 322a is smaller than the distance between the second ground end G and the fourth end 322b. In other words, the second ground end G is closer to the position of the third end 322a. The distance L3 between the second ground end G and the third end 322a is greater than or equal to the first preset distance. The first preset distance is used to avoid the thumb when the electronic device 1000 is held in the folded state, so as to avoid the left thumb covering the second ground end G of the second radiator 22 when the left hand is held. Since the second ground end G is a large current return position, if this position is covered by the finger, the frequency band supported by the antenna assembly 100 will have a large frequency deviation. In the embodiment, the above design can effectively avoid the frequency deviation when the electronic device 1000 is held in the folded state, improve the frequency band stability of the electronic device 1000 when it is held in the folded state, especially the stability of the GPS signal, and realize the cover navigation function.

[0215] The first preset distance is greater than or equal to the partial overlap size of the thumb. The specific value of the first preset distance is not limited in the application. For example, the first preset distance is about 10 mm.

[0216] Please refer to Figure 35 , Figure 35 is a GPS-L1 antenna without a parasitic branch and is arranged in the middle of the top side 321 of the electronic device 1000 (in the folded state), and the S curve and the efficiency curve in the free space and in the right-hand holding scenario. Among them, curve a1 is the S curve in the free space, curve a2 is the S curve in the right-hand holding scenario, curve b1 is the radiation efficiency curve in the free space, curve b2 is the radiation efficiency curve in the right-hand holding scenario, curve c1 is the total efficiency curve in the free space, and curve c2 is the total efficiency curve in the right-hand holding scenario.

[0217] As can be seen from the curves a1 and a2, the GPS-L1 antenna arranged in the middle of the top side 321 of the electronic device 1000 has almost no frequency deviation in the free space and in the right-hand holding scenario. It is proved that the above-mentioned position design of the third radiator 33 in the embodiment avoids the frequency deviation problem caused by the influence of hand holding. As can be seen from the efficiency curve, the efficiency of the GPS-L1 antenna in the middle of the top side 321 of the electronic device 1000 in the right-hand holding scenario decreases by nearly 5 dB compared with the peak efficiency in the free space. The reasons for the decrease in efficiency mainly include: 1. The efficiency decrease caused by the folding of the electronic device 1000; 2. The influence of the human body absorbing energy when holding the hand.

[0218] Referring to Figure 36 , Figure 36 are S curves and efficiency curves of the GPS-L1 antenna without a parasitic branch and the GPS-L1 antenna with a parasitic branch arranged in the middle of the top edge 321 of the electronic device 1000 (in a folded state). The curve a1 is an S curve of the GPS-L1 antenna without a parasitic branch, the curve a2 is an S curve of the GPS-L1 antenna with a parasitic branch, the curve b1 is a radiation efficiency curve of the GPS-L1 antenna without a parasitic branch, the curve b2 is a radiation efficiency curve of the GPS-L1 antenna with a parasitic branch, the curve c1 is a total efficiency curve of the GPS-L1 antenna without a parasitic branch, and the curve c2 is a total efficiency curve of the GPS-L1 antenna with a parasitic branch.

[0219] From Figure 35 and Figure 36 the efficiency curves, it can be seen that the overall radiation efficiency of the GPS-L1 antenna provided by the embodiment of the present application is improved in the right-hand holding scenario, and the efficiency bandwidth is also improved.

[0220] Referring to Figure 37 , Figure 37 are S curves and efficiency curves of the GPS-L1 antenna without a parasitic branch and the GPS-L1 antenna with a parasitic branch (the second radiator 22) arranged in the middle of the top edge 321 of the electronic device 1000 (in a folded state) in a right-hand holding scenario. The curve a1 is an S curve of the GPS-L1 antenna without a parasitic branch, the curve a2 is an S curve of the GPS-L1 antenna with a parasitic branch (the second radiator 22), the curve b1 is a radiation efficiency curve of the GPS-L1 antenna without a parasitic branch, the curve b2 is a radiation efficiency curve of the GPS-L1 antenna with a parasitic branch (the second radiator 22), the curve c1 is a total efficiency curve of the GPS-L1 antenna without a parasitic branch, and the curve c2 is a total efficiency curve of the GPS-L1 antenna with a parasitic branch (the second radiator 22).

[0221] From Figure 37 the efficiency curves, it can be seen that after the second radiator 22 is coupled with the third radiator 33, the efficiency of the GPS frequency band in the hand-holding scenario is obviously improved, and the peak efficiency is increased by nearly 3 dB.

[0222] The above embodiments of the present application can be combined with each other to realize a set of antennas capable of supporting LB frequency bands + GPS-L1 frequency bands + MHB frequency bands; the antenna assembly 100 is designed by the grounding position, the feeding position and the free end position of the LB antenna, realizes the anti-hand holding, forms the dielectric loading, and is resistant to folding; the MHB antenna reuses part of the branches on the LB antenna as parasitic branches to improve the efficiency of the MHB frequency band and increase the MHB bandwidth; the position of the GPS-L1 antenna on the top edge 321 is designed to realize the anti-hand holding of the GPS-L1 antenna, reuse the branches of the MHB antenna as parasitic branches of the GPS-L1 antenna, improve the efficiency of the GPS-L1 antenna when folding, and ensure the performance after folding.

[0223] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and are not to be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application. These improvements and refinements are also considered within the protection scope of the present application.

Claims

1. An electronic device, comprising: The application relates to an antenna assembly. The antenna assembly comprises a frame and an antenna component. The frame comprises a top edge, a first side edge, a bottom edge and a second side edge connected in sequence. The first side edge comprises a finger overlap area and a palm holding area.

2. The electronic device of claim 1, wherein, The antenna component comprises a first radiator and a first signal source.

3. The electronic device of claim 2, wherein, The first radiator comprises a first free end, a first feeding point and a first grounding end arranged in sequence.

4. The electronic device of claim 3, wherein, The first free end is located on the bottom edge.

5. The electronic device of any of claims 1-4, wherein, The first grounding end is located on the first side edge.

6. The electronic device of any of claims 1-4, wherein, The first grounding end is located between the finger overlap area and the bottom edge on the first side edge.

7. The electronic device of any of claims 1-4, wherein, The first signal source is electrically connected to the first feeding point to excite the first radiator to form a first resonant mode supporting a first frequency band.

8. The electronic device of claim 1, wherein, The first radiator further comprises a target radiation section.

9. The electronic device of claim 8, wherein, The target radiation section is at least partially a strong current distribution section in the first resonant mode.

10. The electronic device of claim 9, wherein, At least part of the target radiation section is arranged in the palm holding area on the first side edge. The target radiation section is used to form medium loading on the first resonant mode under palm holding. The target radiation section comprises a first radiation section and a second radiation section. The first radiation section comprises the first grounding end. The second radiation section comprises the first feeding point. The first feeding point is located between the midpoint of the first radiator and the first grounding end. The first radiation section and the second radiation section are continuous. The first resonant mode forms a 1 / 4 wavelength mode supporting the first frequency band between the first grounding end and the first free end. The efficiency of the target radiation section after medium loading on the first resonant mode is greater than the efficiency of the target radiation section without medium loading on the first resonant mode. The first grounding end is located in the palm holding area. The finger overlap area is an overlap area in a first holding scene. The palm holding area is a holding area in a second holding scene. The first holding scene is left-hand holding, and the second holding scene is right-hand holding. The first holding scene is right-hand holding, and the second holding scene is left-hand holding. The antenna component further comprises a second radiator. The second radiator is arranged on the bottom edge. The second radiator comprises a second free end and a second grounding end. The second free end and the first free end are coupled by a coupling gap. The second radiator further comprises a second feeding point between the second grounding end and the second free end. The antenna component further comprises a second signal source. The second signal source is electrically connected to the second feeding point to excite the second radiator to form a second resonant mode supporting a second frequency band. The resonant current of the second resonant mode is distributed between the second grounding end and the second free end. The second resonant mode is a 1 / 4 wavelength mode of the second frequency band. The first radiator further comprises a tuning point. The tuning point is located on the bottom edge. The tuning point is located on the side of the first free end away from the second free end. The antenna assembly further comprises a first tuning circuit, one end of the first tuning circuit is electrically connected to the tuning point, and the other end of the first tuning circuit is grounded; the first tuning circuit is used to make the resonant current of the second resonant mode ground.

11. The electronic device of claim 10, wherein, The second resonant mode comprises a first sub-mode and a second sub-mode, the first sub-mode forms a first sub-current between the second ground end and the second free end, and forms a second sub-current between the first free end and the tuning point, the current intensity of the first sub-current is greater than that of the second sub-current, and the current direction of the first sub-current is the same as that of the second sub-current; The second sub-mode forms a third sub-current between the second ground end and the second free end, and forms a fourth sub-current between the first free end and the tuning point, the current intensity of the fourth sub-current is greater than that of the third sub-current, and the current direction of the third sub-current is opposite to that of the fourth sub-current.

12. The electronic device of claim 11, wherein, The first sub-mode forms a 1 / 4 wavelength mode supporting a first sub-frequency band between the second ground end and the second free end; the second sub-mode forms a 1 / 4 wavelength mode supporting a second sub-frequency band between the first free end and the tuning point, the center frequency of the second sub-frequency band is greater than that of the first sub-frequency band; the first sub-frequency band and the second sub-frequency band are continuous and form the second frequency band, the first sub-mode and the second sub-mode are double-wave resonances supporting the second frequency band, and the second frequency band comprises an MHB frequency band.

13. The electronic device of claim 8, wherein, The first resonant mode comprises a fifth sub-mode and a sixth sub-mode, the fifth sub-mode forms a fifth sub-current between the first ground end and the first free end, and forms a sixth sub-current between the second free end and the second ground end, the current intensity of the fifth sub-current is greater than that of the sixth sub-current, and the current direction of the fifth sub-current is the same as that of the sixth sub-current; The sixth sub-mode forms a seventh sub-current between the first ground end and the first free end, and forms an eighth sub-current between the second free end and the second ground end, the current intensity of the eighth sub-current is greater than that of the seventh sub-current, and the current direction of the eighth sub-current is opposite to that of the seventh sub-current.

14. The electronic device of claim 13, wherein, The fifth sub-mode forms a 1 / 4 wavelength mode supporting a third sub-frequency band between the first ground end and the first free end; the sixth sub-mode forms a 1 / 4 wavelength mode supporting a fourth sub-frequency band between the second free end and the second ground end, the center frequency of the fourth sub-frequency band is greater than that of the third sub-frequency band; the third sub-frequency band and the fourth sub-frequency band are continuous and form the first frequency band, and the fifth sub-mode and the sixth sub-mode are double-wave resonances supporting the first frequency band.

15. The electronic device of any of claims 8-14, wherein, The electronic device is a foldable electronic device, and the electronic device includes a first body and a second body; the first body and the second body are movably connected to present a folded state or an unfolded state; the first body includes a top edge, and the second body includes a bottom edge; when the electronic device is in the unfolded state, the top edge and the bottom edge are located at opposite sides of the electronic device, respectively; and when the electronic device is in the folded state, the top edge and the bottom edge overlap in the thickness direction.

16. The electronic device of claim 15, wherein, The antenna assembly further includes a third radiator and a third signal source; the third radiator is arranged on the top edge; the third radiator includes a third free end, a third feed point and a third ground end arranged in sequence; and the third signal source is electrically connected to the third feed point to excite the third radiator to generate a third resonance mode supporting a third frequency band. When the electronic device is in the folded state, the direction in which the third ground end points to the third free end is opposite to the direction in which the second ground end points to the second free end; and in the thickness direction of the electronic device, at least part of the third radiator is opposite to and coupled with the second radiator.

17. The electronic device of claim 16, wherein, When the electronic device is in the unfolded state, the third resonance mode forms a 1 / 4 wavelength mode supporting the third frequency band between the third ground end and the third free end.

18. The electronic device of claim 16, wherein, When the electronic device is in the folded state, the third resonance mode includes a fifth sub-mode and a sixth sub-mode; the fifth sub-mode forms a ninth sub-current between the third ground end and the third free end, and forms a tenth sub-current between the second free end and the second ground end; the current intensity of the ninth sub-current is greater than that of the tenth sub-current; and the current direction of the ninth sub-current is the same as that of the tenth sub-current. The sixth sub-mode forms an eleventh sub-current between the third ground end and the third free end, and forms a twelfth sub-current between the second free end and the second ground end; the current intensity of the twelfth sub-current is greater than that of the eleventh sub-current; and the current direction of the twelfth sub-current is opposite to that of the eleventh sub-current.

19. The electronic device of claim 18, wherein, The fifth sub-mode forms a 1 / 4 wavelength mode supporting a fifth sub-frequency band between the third ground end and the third free end; the sixth sub-mode forms a 1 / 4 wavelength mode supporting a sixth sub-frequency band between the second free end and the second ground end; the center frequency of the fifth sub-frequency band is greater than that of the sixth sub-frequency band; the fifth sub-frequency band and the sixth sub-frequency band are continuous and form the third frequency band; and the fifth sub-mode and the sixth sub-mode are double-wave resonances supporting the third frequency band.

20. The electronic device of claim 16, wherein, The third frequency band includes a GPS-L1 frequency band, and the first frequency band includes an LB frequency band.

21. The electronic device of claim 16, wherein, The top edge includes a first end and a second end arranged opposite to each other; the distance between the third free end and the first end is greater than or equal to a first preset distance; The distance between the third ground end and the midpoint of the top edge is less than or equal to a second preset distance. The bottom side comprises a third end and a fourth end arranged oppositely, a distance between the second grounding end and the third end is less than a distance between the second grounding end and the fourth end, and the distance between the second grounding end and the third end is greater than or equal to the first preset distance.

Images