Electronic device

Abstract

The invention provides electronic equipment, a frame comprises a top edge, a first side edge, a bottom edge and a second side edge which are connected in sequence, and the first side edge comprises a finger overlapping area and a palm holding area; the antenna assembly comprises 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 which are 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 a finger lap joint area on the first side edge and the bottom edge; 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 a first frequency band, the first radiator further comprises a target radiation section, the target radiation section is at least partial strong current distribution section in the first resonance mode, at least partial target radiation section is arranged in the palm holding area of the first side edge, and the target radiation section is arranged in the palm holding area of the second side edge. And the target radiation section is used for forming medium loading of the first resonant mode under the holding of the palm. According to the invention, the antenna performance in a handheld scene can be improved.

Description

Technical Field

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

[0002] Mobile phones and other electronic devices are commonly used in handheld scenarios, and hands have a certain absorption effect on the electromagnetic waves radiated by the antennas in electronic devices, which leads to a decrease in antenna performance. How to improve the antenna performance of electronic devices in handheld scenarios has become a technical problem that needs to be solved. Summary of the invention

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

[0004] An electronic device provided in an embodiment of the present application includes:

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

[0006] An antenna assembly includes a first radiator and a first signal source, wherein the first radiator includes a first free end, a first feeding point and a first grounding end which are arranged in sequence, wherein 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 a finger overlapping 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 also includes a target radiating section, the target radiating section is at least part of a strong current distribution section under the first resonant mode, at least part of the target radiating section is arranged in a palm holding area of ​​the first side edge, and the target radiating section is used to form a dielectric loading for the first resonant mode when held in the palm.

[0007] The electronic device provided in the embodiment of the present application is designed to have a first radiator including a first free end, a first feeding point and a first grounding end which are arranged in sequence, wherein 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 in a finger overlapping scenario, thereby avoiding the degradation of antenna performance caused by finger absorption; the first signal source is electrically connected to the first feeding point to excite the first radiator to form a first resonant mode supporting the first frequency band, the first radiator also includes a target radiating section, the target radiating section is a strong current distribution section in the first resonant mode, at least part of the target radiating section is arranged in the palm holding area of ​​the first side edge, the target radiating section is used to work under palm holding to form a dielectric loading for the first resonant mode, and the dielectric loading can improve the radiation performance of the antenna component in the first resonant mode, thereby improving the antenna performance in the palm holding scenario, so as to improve the antenna performance in the handheld scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.

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

[0010] Figure 2 is a partial exploded schematic diagram when the electronic device provided in an embodiment of the present application is a foldable electronic device;

[0011] Figure 3 is a schematic diagram of the structure of the frame and antenna assembly provided in an embodiment of the present application;

[0012] Figure 4a This is a schematic diagram of a straight-bar electronic device provided by the present application being held in the left hand;

[0013] Figure 4b This is a schematic diagram of a straight-bar electronic device provided by the present application being held in the right hand;

[0014] Figure 5a It is a schematic diagram of a foldable electronic device provided by the present application, with a hinge on top and held by the right hand;

[0015] Figure 5b This is a schematic diagram of a foldable electronic device provided by the present application, with the hinge on top and held by the left hand;

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

[0017] Figure 7 The process of electronic devices from unfolding to folding can be divided into four processes: unfolding → halving → folding + disconnecting → folding;

[0018] Figure 8 The process from unfolding to folding of an electronic device can be divided into four states: unfolding, halving of the electronic device, folding and disconnecting the electronic device, and folding. The corresponding S parameters and efficiency curves;

[0019] Figure 9a-9f It is a schematic diagram of the structure of 6 groups of antennas provided in this application;

[0020] Fig.10 These are the S parameters, radiation efficiency, and total efficiency curves of the third group of antennas in the embodiments of the present application in the scenarios of closed cover + free space and closed cover + left hand holding;

[0021] Fig.11 These are the S parameters, radiation efficiency, and total efficiency curves of the third group of antennas in the embodiments of the present application in the scenarios of closed cover + free space and closed cover + right-hand holding;

[0022] Fig.12 The S parameters and efficiency curves of the third group of antennas provided by the embodiment of the present application under the conditions of closed cover + free space, closed cover + left hand holding, closed cover + left hand holding without thumb, closed cover + left hand holding with only thumb retained, and closed cover + left hand holding with only left palm retained;

[0023] Fig.13 It is a structural schematic diagram of the first radiation section and the second radiation section on the antenna assembly provided in the first embodiment of the present application;

[0024] Fig.14 is a current simulation diagram of the antenna assembly provided in the first embodiment of the present application in an IFA mode;

[0025] Fig.15 is a current distribution schematic diagram of the antenna assembly provided in the first embodiment of the present application when the current mode is the IFA mode;

[0026] Fig.16 is a current simulation diagram of a current mode of the antenna assembly provided in the first embodiment of the present application in a CRLH mode;

[0027] Fig.17 The radiation efficiency and total efficiency curves of the antenna assembly provided in the first embodiment of the present application in the scenarios of folding + right-hand holding, folding + free space, and folding + left-hand holding;

[0028] Fig.18 The radiation efficiency and total efficiency curves of the antenna assembly provided in the first embodiment of the present application in the scenarios of folding + holding with the right hand, folding + holding with the right hand close to the head, and folding + free space;

[0029] Fig.19The radiation efficiency and total efficiency curves of the antenna assembly provided in the first embodiment of the present application in the scenarios of folding + free space, folding + left hand holding, and folding + left hand close to the head;

[0030] Fig. 20 The radiation efficiency and total efficiency curves of the antenna assembly provided in the first embodiment of the present application in the B8 frequency band and the B28 frequency band when deployed in free space;

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

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

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

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

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

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

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

[0038] Fig.28 is a schematic structural diagram of a rotating and folding electronic device provided in a fourth embodiment of the present application;

[0039] Fig.29 This is a schematic diagram of the structure of the electronic device sliding and folding provided in the fourth embodiment of the present application;

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

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

[0042] Fig.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] Fig.33is a current distribution diagram of a sixth sub-mode of the antenna assembly provided in the fourth embodiment of the present application in a folded state;

[0044] Fig.34 is a schematic structural diagram of the top and bottom position layout of the antenna assembly provided in the fourth embodiment of the present application;

[0045] Fig.35 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and located in the middle of the top edge of the electronic device (folded state) in free space and in the right-hand holding scenario;

[0046] Fig.36 The S curve and efficiency curve of the GPS-L1 antenna provided with a parasitic branch and the GPS-L1 antenna not provided with a parasitic branch and provided in the middle of the top side of the electronic device (folded state) provided in the present embodiment;

[0047] Fig.37 It is the S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with parasitic branches (second radiator) located in the middle of the top edge of the electronic device (folded state) in the right-hand holding scenario.

[0048] Description of Figure Numbers:

[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 grounding terminal A; target radiation section 110; first radiation section 110a; second radiation section 110b; second radiator 22; second free end E; second grounding terminal G; second tuning circuit T2; second feeding point F; second signal source 21; second matching circuit M2; first tuning circuit T1; first body 10; second body 20; third radiator 33; third signal source 31; third free end H; third feeding point J; third grounding terminal K; third matching circuit M3. DETAILED DESCRIPTION

[0050] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0051] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0052] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0053] See also Figure 1 , Figure 1 The following is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application. The electronic device 1000 includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a computer, a wearable device, a drone, a robot, a digital camera, and other devices with communication functions. The present embodiment of the present application is described using a mobile phone as an example, and other electronic devices may refer to this embodiment.

[0054] See also Figure 2 , Figure 21 is a partial exploded schematic diagram of an electronic device 1000. The electronic device 1000 includes an antenna assembly 100. Taking the electronic device 1000 as a mobile phone as an example, the working environment of the antenna assembly 100 is illustrated. 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. Among them, the middle frame 300 includes a middle plate 310 and a frame 320 surrounding the side of the middle plate 310. The frame 320 may be a conductive frame. Of course, in other embodiments, the electronic device 1000 may not have a middle plate 310. The display screen 200, the middle plate 310 and the back cover 400 are stacked 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 components such as a mainboard, a camera module, a receiver module, a battery, and various sensors. One side of the frame 320 is connected to the edge of the display screen 200, and the other side of the frame 320 is connected to the edge of the back cover 400 to form a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integrated structure, and the frame 320 and the back cover 400 can be a separate structure. The above is the working environment of the antenna assembly 100 taking a 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 bar-type mobile phone.

[0056] Optionally, the electronic device 1000 is a foldable electronic device, such as a foldable mobile phone. Specifically, the electronic device 1000 includes a first body 10 and a second body 20. The first body 10 and the second body 20 are movably connected (rotationally connected or slidably connected) to present a folded state or an unfolded state. When the first body 10 and the second body 20 are rotationally connected, the first body 10 and the second body 20 are connected by a rotating shaft, and at least one of the first body 10 and the second body 20 rotates around the rotating shaft. The display screen 200 is a flexible display screen.

[0057] See also Figure 3 , Figure 33 is a back view of the electronic device 1000. The frame 320 includes a top edge 321 and a bottom edge 322 that are arranged opposite to each other, and a first side edge 323 and a second side edge 324 that are connected to the top edge 321 and the bottom edge 322. The top edge 321 is the side away from the ground when the user holds the electronic device 1000 and uses it in portrait mode, and the bottom edge 322 is the side facing the ground when the user holds the electronic device 1000 and uses it in portrait mode. The first side edge 323 is the left side when the user holds the electronic device 1000 and uses it in portrait mode. The second side edge 324 is the right side when the user holds the electronic device 1000 and uses it in portrait mode. Of course, the first side edge 323 can also be the right side when the user holds the electronic device 1000 and uses it. The second side edge 324 is the left side when the user holds the electronic device 1000 and uses it. From the perspective of holding, when the user holds and uses the electronic device 1000 in portrait mode, the user generally holds the first side edge 323 and the second side edge 324, holds the bottom edge 322 of the portion held by the user, or does not hold the bottom edge 322, does not hold the top edge 321, and the distance between the user and the top edge 321 is greater than the distance between the user and the bottom edge 322. For example, if 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] See also Figure 4a-Figure 5b , the first side 323 and the second side 324 both include a palm holding area Z1 and a finger overlapping area Z2. The bottom edge 322 includes an open area Z3, which is not held by fingers. The finger overlapping area Z2 is located in the area of ​​the palm holding area Z1 away from the bottom edge 322. Among them, the finger overlapping area Z2 is the overlapping area in the first holding scenario. The palm holding area Z1 is the holding area in the second holding scenario. Among them, the first holding scenario is left-hand holding, and the second holding scenario is right-hand holding; or, the first holding scenario is right-hand holding, and the second holding scenario is left-hand holding. In the first holding scenario and the second holding scenario, the position of the open area Z3 of the bottom edge 322 remains unchanged.

[0059] See also Figure 4a-Figure 5b , Figure 4a-4b Taking the electronic device 1000 as a bar phone as an example, Figure 4a-4b It is a front view of the electronic device 1000 (the side where the display screen 200 is located). Figure 5a-Figure 5b Taking the electronic device 1000 as a foldable mobile phone with the hinge on top as an example, different holding states related to the present application are explained.

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

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

[0062] The specific structure of the antenna assembly 100 is described below by way of example with reference to the accompanying drawings.

[0063] See also Figure 3 and Figure 6 , Figure 3 It is a schematic diagram of the structure of a straight-bar electronic device. Figure 6 The antenna assembly 100 includes a first radiator 11 and a first signal source 12 .

[0064] See also Figure 3 and Figure 6 The first radiator 11 includes a first free end D, a first feeding point B and a first ground end A which are arranged in sequence.

[0065] The first free end D is an end disconnected 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 an open area Z3 of the bottom edge 322. Optionally, the open area Z3 of the bottom edge 322 is located in an area that is greater than 20 mm away from the first side edge 323 and the second side edge 324.

[0066] Since the first free end D is located at a point of strong electric field, its electric field direction is parallel to the frame (e.g., bottom edge 322). If the hand touches the first free end D, the energy of the parallel electric field will be absorbed, resulting in serious frequency deviation and other problems. In this embodiment, the first free end D is arranged in the open area Z3 of the bottom edge 322, and the open area Z3 of the bottom edge 322 is located in an area where the fingers will not hold in the left hand holding scene or the right hand holding scene, so as to avoid the first free end D from being affected by holding and reduce frequency deviation.

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

[0068] Optionally, the first ground terminal A can also be located at the connection between the bottom edge 322 and the first side edge 323. In this way, in the left-hand holding scenario, the first ground terminal A is located between the thumb overlapping area Z21 in the finger overlapping area Z2 and the bottom edge 322, that is, it is located outside the thumb overlapping area Z21 in the finger overlapping area Z2. In the right-hand holding scenario, the first ground terminal A is located between the finger overlapping area Z2 and the bottom edge 322, that is, it is located outside the finger overlapping 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 terminal A, so as to reduce the efficiency reduction caused by the fingers overlapping the first ground terminal A and absorbing the electromagnetic wave energy, reduce the impact of hand holding on the antenna performance, and balance the performance of the finger holding / palm holding scenarios.

[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 resonance mode supporting the 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, which is used to transmit and receive electromagnetic wave signals in the first frequency band.

[0070] See also Figure 3 and Figure 6, the first radiator 11 also includes a target radiation section 110. Among them, the target radiation section 110 is a strong current distribution section in the first resonance mode. Among them, the vicinity of the first free end D (the length is about 1 / 5 of the total length of the first radiator 11) is a weak current distribution section. The current intensity of the strong current distribution section is greater than the current intensity on the weak current distribution section. The first ground terminal A and the first feeding point B are both strong current points in the first resonance mode. The strong current distribution section of the first radiator 11 in the first resonance mode is the area from the first ground terminal A to the position whose length from the first ground terminal A is 4 / 5 of the total length of the first radiator 11. The target radiation section 110 can be the entire strong current distribution section or a part of the strong current distribution section.

[0071] See also 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 323 (for example, the palm contacts the target radiation section 110 when the left hand is held), and the target radiation section 110 is used to form a dielectric loading for the first resonance mode when the palm is held. The palm holding area Z1 of the first side 323 is the area that the palm is pressed against when the left hand is held. For example, the hand holding area is the area on the first side 323 that is connected to the bottom edge 322 and is less than 40 mm. In addition, when the left hand is held, a part of the bottom edge 322 is also the palm holding area Z1, such as the area that is connected to the first side 323 and is less than 20 mm.

[0072] The target radiation section 110 may be entirely disposed in the palm holding area Z1 , or a portion of the target radiation section 110 may be disposed in the palm holding area Z1 , and another portion of the target radiation section 110 may be disposed in an area outside the palm holding area Z1 on the bottom edge 22 .

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

[0074] By designing the structure of the antenna assembly 100 and the installation 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 323, so that the target radiation section 110 of the antenna assembly 100 can be held in the palm holding scenario, thereby forming a medium loading effect.

[0075] The following is a specific description of the dielectric loading formed by the antenna assembly 100 when the target radiation segment 110 is in the palm holding state: Since the target radiation segment 110 is arranged in the palm holding area Z1 of the first side 323. In the left hand holding scenario, the palm contacts the target radiation segment 110. The equivalent dielectric constant of the palm is relatively large, for example, 25-40, which is much larger than the dielectric constant of 0 in the air, so the palm contacting the target radiation segment 110 is equivalent to changing the radiation environment of the electromagnetic waves radiated by the target radiation segment 110. The palm forms a high dielectric constant medium in the radiation space of the electromagnetic wave. Based on the principle that the wavelength of electromagnetic waves will be shortened in a high dielectric constant medium, allowing the medium (such as the palm) to cover or surround the radiator can greatly reduce the volume of the antenna in the corresponding frequency band, that is, dielectric loading can play a role in miniaturization. In the electronic device 1000, since the length of the target radiation segment 110 is equal before and after the palm is held, the equivalent dielectric constant around the target radiation segment 110 is changed after the palm is held. Since the electrical length of the target radiation segment 110 remains unchanged, according to the wavelength shortening effect, the radiation capacity will shift toward the low frequency, that is, the radiation efficiency peak shifts toward the low frequency side.

[0076] In the first resonance mode, a strong current is distributed on the target radiation section 110. During the radiation process, the strong current encounters a high dielectric constant medium formed by the palm, so that the radiation efficiency peak in the first resonance mode will shift toward the low-frequency side. Since the radiation efficiency of the first resonance mode in the first frequency band and the high-frequency side of the first frequency band gradually increases, 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 toward the low-frequency side, the radiation efficiency of the first frequency band increases, that is, the antenna assembly 100 described in this article forms a dielectric loading in the hand-held state and the 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 loading the first resonance mode forming medium is greater than the efficiency of the target radiation section 110 without loading the first resonance mode forming medium. In other words, the efficiency of the target radiation section 110 after loading the first resonance mode forming medium is improved.

[0078] Generally speaking, when the hand touches the radiator of the antenna assembly 100, the hand has an absorption effect on the electromagnetic waves radiated by the radiator. In the present application, since the area touched by the palm is not the radiation section where the first free end D is located, and the efficiency improvement brought by the dielectric loading of the palm on the antenna assembly 100 is greater than the efficiency reduction brought by the palm absorption effect, it is generally presented that the antenna assembly 100 forms dielectric loading in the palm holding state and the first resonance mode, thereby improving the radiation efficiency in the first resonance mode.

[0079] The above antenna assembly 100 is designed. When the antenna is held in the left hand, 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, thereby avoiding frequency deviation and the palm of the hand holding the target radiation segment 110, thereby achieving dielectric loading in the first frequency band and improving the radiation efficiency of the first frequency band. When the antenna is held in the right hand, 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 terminal A is located outside the finger overlapping area Z2, thereby reducing the absorption caused by the finger overlapping the first ground terminal A and reducing the efficiency, thereby improving the antenna performance in both the left hand holding scenario and the right hand holding scenario.

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

[0081] The electronic device 1000 provided in the present application is designed such that the first radiator 11 includes a first free end D, a first feeding point B and a first grounding end A which are arranged in sequence, the first free end D is located at the bottom edge 322, the first grounding end A is located at the first side edge 323, and the first grounding end A is located between the finger overlapping area Z2 on the first side edge 323 and the bottom edge 322, so as to avoid the first grounding end A being held by the finger overlapping scene, and to avoid the reduction of antenna performance caused by the finger absorption effect; the first signal source 12 is electrically connected to the first feeding point B to excite the first radiator 11 to form a first resonance mode supporting the first frequency band, the first radiator 11 also 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 a medium loading for the first resonance mode when held by the palm, and the medium loading can improve the radiation performance of the antenna assembly 100 in the first resonance mode, thereby improving the antenna performance in the palm holding scene, so as to improve the antenna performance in the handheld scene.

[0082] If the electronic device 1000 is a foldable electronic device, the area of ​​the reference floor is halved after folding, which has a great impact on the efficiency, especially for the low frequency that relies on the radiation of the reference floor.

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

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

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

[0086] (1) The electronic device 1000 is unfolded → the electronic device 1000 is halved: In this process, the reference floor is halved, the contribution of the longitudinal current from the reference floor to the radiation efficiency is greatly reduced, and the radiation efficiency 'left sideband' shifts to the right, which is the main reason for the large reduction in the low-frequency antenna in the folded state.

[0087] (2) Electronic device 1000 is halved → Electronic device 1000 is folded + disconnected: 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) The electronic device 1000 is folded + not connected → the electronic device 1000 is folded: In this process, the boundary condition is formed, and a slot mode is generated. The radiation efficiency at the slot mode resonance position is improved, but the radiation efficiency in the B5 or N28 frequency band is still low.

[0089] From the above, it can be seen that the folding of the electronic device 1000 has a significant impact on the efficiency of the low-frequency antenna. Thus, in the N28 frequency band, the maximum drop is close to 10 dB.

[0090] The following embodiment is used to illustrate the efficiency improvement of the low-frequency antenna when the electronic device 1000 is in a folded state (closed).

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

[0092] See also Figure 9a-9fThe following comparison experiments are conducted to compare the performance of the first free end D and the first ground end A of the antenna assembly 100 in different holding scenarios and in free space. Six antennas are arranged on the foldable electronic device, which are respectively denoted as the first antenna group 10a, the second antenna group 10b, the third antenna group 10c, the fourth antenna group 10d, the fifth antenna group 10e, and the sixth antenna group 10f.

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

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

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

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

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

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

[0099] Please refer to Table 1-1, which shows the radiation efficiency of the six antenna groups in the B28 frequency band in the scenarios of closed (i.e. folded) free space, closed left hand holding, and closed right hand holding.

[0100] Table 1-1

[0101]

[0102] Please refer to Table 1-2, which shows the total efficiency of the six antenna groups in the B28 frequency band in the scenarios of closed (i.e. folded) free space, closed left hand holding, and closed right hand holding.

[0103] Table 1-2

[0104]

[0105] It can be seen from Table 1-1 and Table 1-2 that the first group of antennas 10a is basically unobstructed when held in the right hand, so the efficiency of the first group of antennas 10a when held in the right hand is basically consistent with the efficiency in free space; when held in the left hand, because part of it is located in the palm holding area Z1, it has a certain dielectric loading effect, so the efficiency is higher than the efficiency in free space.

[0106] The second group of antennas 10b are basically unobstructed when held in the right hand, so the efficiency of the second group of antennas 10b when held in the right hand is basically consistent with the efficiency in free space; when held in the left hand, because part of the second group of antennas 10b is located in the palm holding area Z1, it has a certain dielectric loading effect, so the efficiency is higher than the efficiency in free space.

[0107] The third group of antennas 10c are basically unobstructed when held by the right hand, so the efficiency of the third group of antennas 10c when held by the right hand is basically the same as that in free space; when held by the left hand, because part of the antenna is located in the palm holding area Z1, it has a certain dielectric loading effect, so the efficiency is higher than the efficiency in free space. And as the length of the antenna radiator located in the palm holding area Z1 in the left hand holding scenario increases, the efficiency improvement effect is more obvious.

[0108] The fourth antenna group 10d to the sixth antenna group 10f have a lower efficiency when held by the right hand because the fingers overlap the free end; when held by the left hand, because part of the antenna is located in the palm holding area Z1, there is a certain dielectric loading effect, so the efficiency is higher than the efficiency in free space. And as the length of the antenna radiator set in the palm holding area Z1 in the left hand holding scenario increases, the efficiency improvement effect is more obvious.

[0109] Based on the need to ensure both left-hand holding performance and right-hand holding performance, the first group of antennas 10a to the third group of antennas 10c meet the need to ensure both left-hand holding performance and right-hand holding performance to a certain extent. Furthermore, the second group of antennas 10b and the third group of antennas 10c have ground ends located below the right-hand overlap area, free ends located in the open area Z3 of the bottom edge 322, and the target radiation section 110 is located in the palm holding area Z1 under the left hand holding, so that the dielectric loading effect is greater and the antenna performance is better.

[0110] See also Fig.10 , Fig.10It is the S parameter, radiation efficiency, and total efficiency curve of the third group of antennas 10c in the embodiment of the present application in the closed cover + free space and closed cover + left hand holding scenarios. Among them, curve a1 is the S parameter of the third group of antennas 10c in the closed cover + free space. Curve b1 is the radiation efficiency curve of the third group of antennas 10c in the closed cover + free space. Curve c1 is the total efficiency curve of the third group of antennas 10c in the closed cover + free space. Curve a2 is the S parameter of the third group of antennas 10c in the closed cover + left hand holding scenario. Curve b2 is the radiation efficiency curve of the third group of antennas 10c in the closed cover + left hand holding scenario. Curve c2 is the total efficiency curve of the third group of antennas 10c in the closed cover + left hand holding scenario.

[0111] According to curve a1 and curve b1, the third group of antennas 10c supports the B28 frequency band in both the closed cover + free space and closed cover + left hand holding scenarios. According to curve a2 and curve b2, the efficiency peak of the third group of antennas 10c in the closed cover + 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 closed cover + left hand holding scenario is located in the B28 frequency band. In other words, compared with the closed cover + free space, the efficiency peak of the third group of antennas 10c in the closed cover + left hand holding scenario moves toward the low-frequency side, thereby improving the efficiency in the B28 frequency band. The above is mainly because the palm of the third group of antennas 10c contacts the target radiation segment 110 of the antenna assembly 100 in the closed cover + left hand holding scenario, and the palm has a dielectric loading effect on the antenna assembly 100, which changes the equivalent dielectric constant around the radiator, resulting in a low deviation of the radiation efficiency peak, and thus making the efficiency peak located in the B28 frequency band.

[0112] See also Fig.11 , Fig.11 It is the S parameter, radiation efficiency, and total efficiency curve of the third group of antennas 10c in the embodiment of the present application in the closed cover + free space and closed cover + right hand holding scenarios. Among them, curve a1 is the S parameter of the third group of antennas 10c in the closed cover + free space. Curve b1 is the radiation efficiency curve of the third group of antennas 10c in the closed cover + free space. Curve c1 is the total efficiency curve of the third group of antennas 10c in the closed cover + free space. Curve a2 is the S parameter of the third group of antennas 10c in the closed cover + right hand holding scenario. Curve b2 is the radiation efficiency curve of the third group of antennas 10c in the closed cover + right hand holding scenario. Curve c2 is the total efficiency curve of the third group of antennas 10c in the closed cover + right hand holding scenario.

[0113] According to curves a1 and b1, the third antenna 10c supports the B28 frequency band in both the cover + free space and cover + right-hand holding scenarios. According to curves a2 and b2, the efficiency of the third antenna 10c in the cover + right-hand holding scenario is basically unchanged compared to the cover + free space, the resonance is slightly deeper, and the efficiency is basically unchanged.

[0114] The following is a comparison of the efficiency of the third antenna 10c under different hand contacts when the cover is closed and held with the left hand.

[0115] See also Fig.12 , Fig.12 The S parameters and efficiency curves of the third group of antennas 10c provided in an embodiment of the present application are under the conditions of closed cover + free space, closed cover + left hand holding, closed cover + left hand holding without thumb, closed cover + left hand holding with only thumb retained, and closed cover + left hand holding with only left palm retained.

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

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

[0118] The S parameters and radiation efficiency curves of the third group of antennas 10c when the cover is closed and held in the left hand are substantially coincident with the S parameters and radiation efficiency curves of the third group of antennas 10c when the cover is closed and held in the left hand without the thumb.

[0119] Comparison of the S parameters and radiation efficiency curves of the third group of antennas 10c in the closed state + free space and the S parameters and radiation efficiency curves of the third group of antennas 10c in the closed state + left hand holding shows that after the left palm forms a dielectric loading, the efficiency peak moves forward to or near the B28 band, and the efficiency and bandwidth of the B28 band are greatly improved. The entire left hand holding still shows an improvement in efficiency.

[0120] Comparing the S parameters and radiation efficiency curves of the third group of antennas 10c when the cover is closed + held with the left hand and the S parameters and radiation efficiency curves of the third group of antennas 10c when the cover is closed + held with the left hand with only the left palm remaining, it can be seen that the efficiency is more improved when holding with the left hand with only the left palm remaining.

[0121] See also Fig.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 terminal A. The second radiation section 110b includes the first feeding point B. The present application does not specifically limit the lengths of the first radiation section 110a and the second radiation section 110b. Among them, the first feeding point B and the first ground terminal A are both strong current points, so the vicinity of the first ground terminal A is a strong current area, and the vicinity of the first feeding point B is a strong current 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, so that the palm forms a dielectric loading effect at the first radiation section 110a and / or the second radiation section 110b, the radiation efficiency of the left hand holding is improved.

[0122] Optional, see Fig.14 , the first feeding point B is located between the midpoint of the first radiator 11 and the first ground terminal A. In this way, the first radiator 11 and the first signal source 12 form an IFA antenna. The current mode of the first resonant mode is the IFA current mode. In the IFA current mode, the first radiation segment 110a is continuous with the second radiation segment 110b, and the portion between the first ground terminal A and the first feeding point B is a high current segment. Furthermore, in the IFA current mode, the portion from the first ground terminal A to the position where 3 / 4 of the length of the first radiator 11 is located is a high current segment.

[0123] In this embodiment, the first feeding point B is designed to be close to the first ground terminal A, so that the current mode of the first resonant mode is the IFA current mode, so as to form a longer strong current segment on the first radiator 11, so that more strong current segments are in contact with the palm of the left hand, the dielectric loading effect is greater, and the efficiency improvement effect is more obvious.

[0124] Optional, see Fig.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 of the first frequency band, and the first resonant mode forms a 1 / 4 wavelength mode supporting the first frequency band between the first ground point 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 mode of the IFA antenna. At this time, the antenna assembly 100 has a higher radiation efficiency in the first frequency band.

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

[0127]

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

[0129] For further information, see Fig.15 , the first feeding point B can be arranged at the first side 323. Since the first ground terminal A is located at the first side 323, and the distance between the first ground terminal A and the bottom edge 322 is less than or equal to 20 mm, the distance between the first ground terminal 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 ground terminal A. In this way, the first feeding point B is arranged at the first side 323, so that the antenna assembly 100 is an IFA antenna to form a longer strong current segment, and form more dielectric loading effects when held in the palm.

[0130] In other embodiments, see Fig.16 , the first feeding point B can also be set between the midpoint of the first radiator 11 and the first free end D. Further, the first feeding point B can also be set between the first free end D and the position of 1 / 4 of the total length of the first radiator 11 from the first free end D. In this case, the first resonant mode is the left-handed mode (CRLH mode). The current distribution of this mode is as follows Fig.16 As shown. In this embodiment, the first radiation section 110a is formed between the first ground terminal 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 of the left hand touches the first radiation section 110a and the second radiation section 110b when holding the left hand, a certain dielectric loading can also be formed to improve efficiency.

[0131] Please refer to Table 1-3, which is a comparison of the efficiencies of the third group of antennas 10c provided in the present application in the IFA mode and the left-hand mode in the scenarios of closed cover + free space, closed cover + left-hand holding, and closed cover + right-hand holding. It can be seen from Table 1-3 that in the closed cover + free space scenario, the efficiency of the left-hand mode (CRLH) is reduced due to the generation of current zeros and reverse currents. In the closed cover + left-hand holding scenario, due to the dielectric loading effect of the palm, the radiation efficiency is improved, making the efficiency in the left-hand holding scenario higher than that in the closed cover + free space. In the closed cover + right-hand holding scenario, the efficiency of the left-hand mode (CRLH) is reduced due to the basic absence of dielectric loading or little dielectric loading effect, and the generation of current zeros and reverse currents.

[0132] Table 1-3

[0133] Frequency band Radiation efficiency in free space Radiation efficiency when held in the left hand Radiation efficiency for right hand holding B28-IFA Mode -12.0 -8.2 -11.4 B28-CRLH Mode -13.0 -8.3 -12.7

[0134] This application takes the antenna assembly 100 as an IFA antenna as an example to illustrate the following inventive concepts.

[0135] Optionally, the antenna assembly 100 also includes 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 includes at least one of a capacitor and an inductor. Further, the first matching circuit M1 also includes a switch selection circuit, which is used to select devices (inductors and / or capacitors) with different impedances to work, so as to adjust the electrical length of the first radiator 11, thereby changing the aperture of the first radiator 11, adjusting the electrical length of the first radiator 11, and switching 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 separately 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 in the embodiment of the present application has designed the positions of the first free end D, the first feeding end, the strong current segment and the first grounding terminal A of the antenna component 100. Specifically, the first free end D of the antenna component 100 is arranged in the open area Z3 of the bottom edge 322 to prevent the hand from 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 grounding terminal A to form an IFA antenna, which is more efficient in the closed scenario; the strong current segment is arranged in the palm holding area Z1 in the holding scenario, so that the palm can perform dielectric loading on the strong current segment on the antenna, and the dielectric loading is used to improve the radiation efficiency of the lower frequency band; the first grounding terminal A is arranged below the finger overlapping area Z2 to reduce the impact of the hand holding performance; the above design realizes the formation of dielectric loading by the palm in the left-hand holding scenario, thereby improving the performance, and the first grounding terminal A is away from the finger in the right-hand holding scenario, and the performance does not decrease or decreases slightly, so as to balance the holding performance of the left and right hands and form a low-frequency antenna that is resistant to folding and hand holding.

[0137] See also Fig.17 , Fig.17 These are the radiation efficiency and total efficiency curves of the antenna assembly 100 provided in an embodiment of the present application in the scenarios of folding + right-hand holding, folding + free space, and folding + left-hand holding.

[0138] Curve a1 is a radiation efficiency curve of the antenna assembly 100 when folded and held in the right hand. Curve b1 is a radiation efficiency curve of the antenna assembly 100 when folded and in free space. Curve c1 is a radiation efficiency curve of the antenna assembly 100 when folded and held in the left hand.

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

[0140] It can be seen that in the left-hand holding scenario, the palm forms a dielectric loading, the performance is improved, and in the right-hand holding scenario, the first ground terminal A is far away from the fingers, the performance does not decrease or decreases slightly, the left and right hand holding performance is balanced, and a low-frequency antenna that is resistant to folding and hand holding is formed.

[0141] See also Fig.18 , Fig.18 These are the radiation efficiency and total efficiency curves of the antenna assembly 100 provided in an embodiment of the present application in the scenarios of folding + right-hand holding, folding + right-hand holding close to the head, and folding + free space.

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

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

[0144] See also Fig.19 , Fig.19 These are the radiation efficiency and total efficiency curves of the antenna assembly 100 provided in an embodiment of the present application in the scenarios of folding + free space, folding + left-hand holding, and folding + left hand close to the head.

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

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

[0147] See also Fig. 20 , Fig. 20 These are the radiation efficiency and total efficiency curves of the antenna assembly 100 provided in an embodiment of the present application in the B8 frequency band and the B28 frequency band when unfolded in free space.

[0148] Curve a1 is a radiation efficiency curve of the antenna assembly 100 in the B8 frequency band when it is deployed in free space. Curve b1 is a radiation efficiency curve of the antenna assembly 100 in the B28 frequency band when it is deployed in free space.

[0149] Curve a2 is a total efficiency curve of the antenna assembly 100 in the B8 frequency band when it is deployed in free space. Curve b2 is a total efficiency curve of the antenna assembly 100 in the B28 frequency band when it is deployed in free space.

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

[0151] Table 1-4

[0152]

[0153] In this embodiment, please refer to Fig.21 The antenna assembly 100 further includes a second radiator 22. The second radiator 22 is disposed at the bottom edge 322. The second radiator 22 includes a second free end E and a second ground end G which are sequentially disposed. A coupling gap is formed between the second free end E and the first free end D.

[0154] The electrical length of the second radiator 22 is less than the electrical length of the first radiator 11. The second radiator 22 serves as a parasitic radiator of the first radiator 11. 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 double-wave resonance supporting the first frequency band to improve the efficiency of the first frequency band. With regard to the problem that the efficiency of the low-frequency antenna decreases after the electronic device 1000 is folded, the radiation efficiency of the foldable electronic device after folding can be improved by setting the second radiator 22.

[0155] The first resonant mode includes a third sub-mode and a fourth sub-mode. The third sub-mode and the fourth sub-mode have different resonant current distributions. The third sub-mode and the fourth sub-mode exist at the same time, and the third sub-mode and the fourth sub-mode each form a resonance to form a dual-wave resonance. That is, the third sub-mode and the fourth sub-mode are dual-wave resonances that support the first frequency band.

[0156] For details, please refer to Fig. 22, the resonant current of the third sub-mode includes a fifth sub-current Q5 formed between the first ground terminal A and the first free terminal D, and a sixth sub-current Q6 formed between the second free terminal E and the second ground terminal 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 terminal A to the first free terminal D, and the sixth sub-current Q6 flows from the second free terminal E to the second ground terminal G. Of course, due to the periodicity of the current, the current direction can also flow in the opposite direction.

[0157] The third sub-mode forms a 1 / 4 wavelength mode supporting a third sub-frequency band between the first ground end A and the first free end D.

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

[0159] See also Fig.23 , the resonant current of the fourth sub-mode includes a seventh sub-current Q7 formed between the first ground terminal A and the first free terminal D, and an eighth sub-current Q8 formed between the second free terminal E and the second ground terminal 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 terminal A to the first free terminal D, and the eighth sub-current Q8 flows from the second ground terminal G to the second free terminal 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 a fourth sub-frequency band between the second free end E and the second ground end G.

[0161] Specifically, in the fourth sub-mode, the resonant current on the second ground terminal G and the second free end E is the part that mainly contributes to the radiation energy. The electrical length between the second ground terminal 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 terminal 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 terminal G and the second free end E is smaller than the electrical length between the first ground terminal A and the first free end D. The center frequency of the fourth sub-band is greater than the center frequency of the third sub-band. The third sub-band is continuous with the fourth sub-band and forms the first band. For example, the high-frequency side band of the third sub-band overlaps at least partially with the low-frequency side band of the fourth sub-band to form a continuous band. The continuous band covers the first band. For example, the first band is N28 (703-803 MHz) in the LB band, the third sub-band is 680-750 MHz, and the fourth sub-band is 740-810 MHz. This data is for example only.

[0163] In short, the first signal source 12 excites the first radiator 11 and the second radiator 22 to jointly generate the resonant current of the third sub-mode, wherein the current of the third sub-mode on the first radiator 11 and the second radiator 22 is the same direction current, and the resonant current of the third sub-mode forms a current loop with the floor current on the reference floor, and the third sub-mode is also called the radiation mode. The radiation mode is a mode that depends 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 the resonant current of the fourth sub-mode, and the current of the fourth sub-mode on the first radiator 11 and the second radiator 22 is the reverse current, and the fourth sub-mode is also called the balanced mode, which is relatively independent of the participation of the reference floor.

[0164] 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 where the radiation mode is located) and thus improve the in-band efficiency of the radiation mode, that is, improve the in-band efficiency of the first frequency band.

[0165] Optionally, a difference between a center frequency of the fourth sub-frequency band and a 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 and hand-held absorption lead to a significant decrease in efficiency in the low-frequency band. The embodiment of the present application designs the positions of the ground end, free end and feeding point of the antenna assembly 100 to avoid hand-held absorption and facilitate dielectric loading to improve efficiency. Furthermore, by providing a second radiator 22, a radiation mode and a balanced mode of the EE mode are formed to further improve the radiation efficiency of the low-frequency antenna in the foldable electronic device after folding, thereby ensuring the stability of the closed-cover calling function of the foldable electronic device.

[0167] Among them, see Fig.24, the third sub-mode is dominant among the third and fourth sub-modes, so after the resonant frequency of the fourth sub-mode meets the requirements, its specific size has little effect on the third sub-mode, so the present application does not make specific restrictions on the electrical length of the second radiator 22. For example, the grounding end of the second radiator 22 can be arranged at the bottom edge 322, or at the second side edge 324. Further, the antenna assembly 100 also includes a second tuning circuit T2, which is electrically connected between the second grounding end G and the second free end E. The second tuning circuit T2 includes a grounding capacitor and / or a grounding inductor to adjust the electrical length of the second radiator 22. For example, the second tuning circuit T2 is a grounding capacitor to increase the electrical length of the second radiator 22, shorten the physical length of the second radiator 22, and reduce the space occupied by the second radiator 22.

[0168] This embodiment is based on the previous embodiment. Fig.25 The second radiator 22 further includes a second feeding point F located between the second ground end G and the second free end E. The second feeding point F may be relatively close to the second ground end G.

[0169] The antenna assembly 100 further includes 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 also includes 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 includes at least one of a capacitor and an inductor. Further, the second matching circuit M2 also includes a switch selection circuit, which is used to select devices (inductors and / or capacitors) with different impedances to work, so as to adjust the electrical length of the second radiator 22, thereby changing the aperture of the second radiator 22, adjusting the electrical length of the second radiator 22, and switching the sub-band of the second frequency band.

[0171] See also Fig.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] Among them, the first frequency band and the second frequency band are different frequency bands. For example, the first frequency band is the LB frequency band (less than 1 GHz). The second frequency band includes but is not limited to the MHB frequency band (1-3 GHz), the UHB frequency band (greater than 3 GHz), the Wi-Fi 2.4G frequency band, the Wi-Fi 5G frequency band, etc. In this embodiment, the second frequency band is the MHB frequency band as an example, so 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 configured as LB antennas, and the second radiator 22 and the second signal source 21 are configured as MHB antennas, thereby improving the efficiency of the LB band and supporting the LB band + MHB band at the same time.

[0174] For further information, see Fig.26 The first radiator 11 further includes a tuning point C. The tuning point C is located at the bottom edge 322. The tuning point C is located at a 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] See also Fig.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 ground the resonant current of the second resonant mode.

[0176] In other words, the current of the second resonance mode is not only distributed on the second radiator 22 , but also distributed 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 bandpass circuit for the second frequency band and a bandstop circuit for the second frequency band. That is, the first tuning circuit T1 makes the current of the second resonance mode go to the ground, and is in an open circuit state for the current of the first resonance mode. Taking the first frequency band as the LB frequency band and the second frequency band as the MHB frequency band as an example, the first tuning circuit T1 is a small capacitor connected to the ground, and the capacitance value of the small capacitor is less than 2pF.

[0178] Furthermore, the electrical length between the tuning point C and the first free end D is smaller 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 serves 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 double-wave resonance supporting the second frequency band to improve the efficiency of the second frequency band. With regard to the problem of decreased efficiency of the MHB antenna after the electronic device 1000 is folded, by connecting the first tuning circuit T1 to the first radiator 11, the resonant current path of the second resonant mode is changed to generate more resonant modes, and the LB antenna is reused, and the radiation efficiency of the MHB antenna after folding is also improved.

[0179] The second resonant mode includes a first sub-mode and a second sub-mode. The resonant current distribution of the first sub-mode is different from that of the second sub-mode. The first sub-mode and the second sub-mode exist at the same time, and the first sub-mode and the second sub-mode each form 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] For details, please refer to Fig.26 , the resonant current of the first sub-mode includes a first sub-current Q1 formed between the second ground terminal G and the second free terminal E, and a second sub-current Q2 formed between the first free terminal D and the tuning point C. The current intensity of the first sub-current Q1 is greater than the current intensity of the second sub-current Q2. The current direction of the first sub-current Q1 is the same as the current direction of the second sub-current Q2. For example, the first sub-current Q1 flows from the second ground terminal G to the second free terminal E, and the second sub-current Q2 flows from the first free terminal 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 the first sub-frequency band between the second ground end G and the second free end E.

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

[0183] See also Fig. 27, the resonant current of the second sub-mode includes a third sub-current Q3 formed between the second ground terminal G and the second free terminal E, and a fourth sub-current Q4 formed between the first free terminal D and the tuning point C. The current intensity of the fourth sub-current Q4 is greater than the current intensity of the third sub-current Q3. The current direction of the fourth sub-current Q4 is opposite to the current direction of the third sub-current Q3. For example, the third sub-current Q3 flows from the second ground terminal G to the second free terminal E, and the fourth sub-current Q4 flows from the first tuning circuit T1 and the tuning point C to the first free terminal 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-frequency band between the first free end D and the tuning point C.

[0185] Specifically, in the second sub-mode, the resonant current between the first free end D and the tuning point C 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 between 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 smaller 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 is continuous with the second sub-band and forms the second band. For example, the high-frequency side band of the first sub-band overlaps at least partially with the low-frequency side band of the second sub-band to form a continuous band. The continuous band covers the second band. For example, the second band is B41 (2496-2690 MHz) in the MHB band, the first sub-band is 2300-2600 MHz, and the second sub-band is 2500-2800 MHz. This data is for example only.

[0187] In short, the second signal source 21 excites the first radiator 11 and the second radiator 22 between the first free end D and the tuning point C to jointly generate the 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 of the first sub-mode is the same direction current, the resonant current of the first sub-mode forms a current loop with the floor current on the reference floor, and the first sub-mode is also called the 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 radiator 11 and the second radiator 22 between the first free end D and the tuning point C to generate the resonant current of the second sub-mode, and the current on the first radiator 11 and the second radiator 22 between the first free end D and the tuning point C of the second sub-mode is the reverse current, and the second sub-mode is also called the balanced mode, which 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 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 where the radiation mode is located) and thus improve the in-band efficiency of the radiation mode, that is, improve the in-band efficiency of the second frequency band.

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

[0190] For foldable electronic devices, the reduction of the reference floor after folding and hand-held absorption lead to a significant decrease in efficiency in the mid- and high-frequency bands. The embodiment of the present application designs the positions of the ground end, free end and feeding point of the antenna assembly 100 to avoid hand-held absorption and facilitate dielectric loading to improve efficiency. Furthermore, a second radiator 22 is provided to form a radiation mode and a balanced mode of the EE mode, so as to further improve the radiation efficiency of the mid- and high-frequency antenna in the foldable electronic device after folding, thereby ensuring the stability of the closed-cover calling function of the foldable electronic device.

[0191] Among them, the first sub-mode is the main one among the first and second sub-modes, so after the resonant frequency of the second sub-mode meets the requirements, its specific size has little effect on the first sub-mode, so this application does not make specific limitations on the electrical length of the second radiator 22.

[0192] See also Fig.28 and Fig.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 that are 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 respectively located on opposite sides of the electronic device 1000. 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] See also Fig.30The antenna assembly 100 further includes a third radiator 33 and a third signal source 31. The third radiator 33 is disposed at the top edge 321. The third radiator 33 includes a third free end H, a third feeding point J and a third grounding end K which are sequentially arranged. The third signal source 31 is electrically connected to the third feeding point J to excite the third radiator 33 to generate a third resonant mode supporting a third frequency band.

[0194] Optional, see Fig.30 , the antenna assembly 100 also includes a third matching circuit M3. The third matching circuit M3 is electrically connected between the third feeding point J and the third signal source 31. The third matching circuit M3 is used 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 includes at least one of a capacitor and an inductor. Further, the third matching circuit M3 also includes a switch selection circuit, which is used to select devices (inductors and / or capacitors) with different impedances to work, so as 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-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, an UHB frequency band, a Wi-Fi 2.4G frequency band, a Wi-Fi 5G frequency band, a GPS frequency band, etc. This embodiment takes the third frequency band as an example of a GPS frequency band.

[0196] The third radiator 33 and the third signal source 31 form an IFA antenna, and the electrical length between the third ground terminal 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 terminal K and the third free end H.

[0197] See also Fig.31 , when the electronic device 1000 is in a folded state, the direction in which the third ground terminal K points to the third free end H is opposite to the direction in which the second ground terminal G points to the second free end E. In the thickness direction of the electronic device 1000. The third radiator 33 is opposite to and coupled with at least a portion of the second radiator 22. Further, the orthographic projection of the third ground terminal K on the second radiator 22 is located between the second ground terminal 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 terminal 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 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, when the electronic device 1000 is in the folded state, the third resonance mode includes a fifth sub-mode and a sixth sub-mode. The resonant current distribution of the fifth sub-mode is different from that of the sixth sub-mode. The fifth sub-mode and the sixth sub-mode exist at the same time, and the fifth sub-mode and the sixth sub-mode each form a resonance to form a dual-wave resonance. That is, the fifth sub-mode and the sixth sub-mode are dual-wave resonances supporting the third frequency band.

[0199] See also Fig.32 , the fifth sub-mode forms a ninth sub-current Q9 between the third ground terminal K and the third free terminal H, and forms a tenth sub-current Q10 between the second free terminal E and the second ground terminal G. The current intensity of the ninth sub-current Q9 is greater than the current intensity of the tenth sub-current Q10. The current direction of the ninth sub-current Q9 is the same as the current direction of the tenth sub-current Q10. For example, the ninth sub-current Q9 flows from the third ground terminal K to the third free terminal H, and the tenth sub-current Q10 flows from the second free terminal E to the second ground terminal 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 supporting the fifth sub-frequency band between the third ground end K and the third free end H.

[0201] Specifically, in the fifth sub-mode, the resonant current on the third ground terminal K and the third free end H is the part that mainly contributes to the radiation energy. The electrical length between the third ground terminal K and the third free end H is about 1 / 4 wavelength of the fifth sub-frequency band, and the resonant current on the third ground terminal K and the third free end H operates in the 1 / 4 wavelength mode of the fifth sub-frequency band.

[0202] See also Fig.33 , the sixth sub-mode forms an eleventh sub-current Q11 between the second free end E and the second ground end G, and forms a twelfth sub-current Q12 between the third ground end K and the third free end H. The current intensity of the twelfth sub-current Q12 is greater than the current intensity of the eleventh sub-current Q11. The current direction of the twelfth sub-current Q12 is opposite to the current direction 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 supporting the sixth sub-frequency band between the second ground end G and the second free end E.

[0204] Specifically, in the sixth sub-mode, the resonant current on the second ground terminal G and the second free end E is the part that mainly contributes to the radiation energy. The electrical length between the second ground terminal 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 terminal 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 terminal G and the second free end E is smaller than the electrical length between the third ground terminal 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 band. For example, the high-frequency side band of the sixth sub-band overlaps at least partially with the low-frequency side band of the fifth sub-band to form a continuous band. The continuous band covers the third band. For example, the third band is the GPS-L1 band (1575MHz), the fifth sub-band is 1500-1600MHz, and the sixth sub-band is 1550-1650MHz. This data is for example only.

[0206] The difference between the third resonance mode in this embodiment and the second resonance mode in the third embodiment at least includes: the second resonance mode formed by the first radiator 11 and the second radiator 22 in the third embodiment is a resonance mode formed by a common reference floor, while the third resonance mode in the embodiment of the present application is a resonance mode formed by a non-common reference floor.

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

[0208] The present application sets the second radiator 22 as a parasitic branch of the third radiator 33, and the sixth sub-mode forms a double-wave resonance with the fifth sub-mode, wherein the fifth sub-mode can improve the in-band efficiency and efficiency bandwidth of the sixth sub-mode. Among them, the second radiator 22 can also support the MHB band, so that the antenna assembly 100 can support the GPS band + MHB band + LB band, and improve the efficiency of the LB band, MHB band and GPS band when folded, so as to realize the functions of closing the cover for talking and closing the cover for navigation when the electronic device 1000 is folded. The reuse of the second radiator 22 increases the function of the antenna assembly 100 while reducing the space occupied by the antenna assembly 100.

[0209] See also Fig.34, the 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 the first preset distance. The first preset distance is used to avoid the thumb when holding the folded electronic device 1000 to prevent the left thumb from covering the third free end H. For example, the first preset distance is about 10 mm.

[0210] See also Fig.34 The distance L2 between the third ground terminal K and the second end 321b is greater than or equal to the first preset distance, which is used to avoid the thumb when holding the electronic device 1000 in the folded state, so as to prevent the right thumb from covering the third ground terminal K. Through the above design, the frequency deviation of the electronic device 1000 when held in the folded state can be effectively avoided, and the frequency band stability of the electronic device 1000 when held in the folded state can be improved, especially the stability of the GPS signal, so as to realize the closed cover navigation function.

[0211] Further, the distance between the third ground terminal K and the midpoint of the top edge 321 is less than or equal to a second preset distance. The present application does not limit the second preset distance, and optionally, the second preset distance is 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 terminal K is close to the midpoint of the top edge 321. When generating a resonant current, the first radiator 11 forms less transverse (X-axis direction) mode current and more longitudinal mode (Y-axis direction) current on the reference floor. The longitudinal mode current can further 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] See also Fig.34, the bottom edge 322 includes a third end 322a and a fourth end 322b that are arranged opposite to each other. When the electronic device 1000 is in a folded state, the third end 322a and the first end 321a are arranged opposite to each other in the thickness direction, and the fourth end 322b and the second end 321b are arranged opposite to each other in the thickness direction. The distance between the second grounding end G and the third end 322a is smaller than the distance between the second grounding end G and the fourth end 322b. In other words, the second grounding end G is closer to the position of the third end 322a. The distance L3 between the second grounding 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 holding the electronic device 1000 in the folded state, so as to avoid the left thumb covering the second grounding end G of the second radiator 22 when the left hand is holding it. Since the second grounding end G is a high current position back to the ground, if this position is covered by a finger, a large frequency deviation will occur in the frequency band supported by the antenna assembly 100. Through the above design in this embodiment, frequency deviation can be effectively avoided when the electronic device 1000 is held in a folded state, and the frequency band stability of the electronic device 1000 when held in a folded state is improved, especially the stability of the GPS signal, to achieve the closed-cover navigation function.

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

[0216] See also Fig.35 , Fig.35 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and arranged in the middle of the top edge 321 of the electronic device 1000 (folded state) in free space and in the right-hand holding scenario. Among them, curve a1 is the S curve of free space, curve a2 is the S curve of the right-hand holding scenario, curve b1 is the radiation efficiency curve of free space, curve b2 is the radiation efficiency curve of the right-hand holding scenario, curve c1 is the total efficiency curve of free space, and curve c2 is the total efficiency curve of the right-hand holding scenario.

[0217] It can be seen from curve a1 and curve a2 that the GPS-L1 antenna located in the middle of the top edge 321 of the electronic device 1000 has almost no frequency deviation in free space and in the right-hand holding scenario. This indicates that the position design of the third radiator 33 in the embodiment of the present application prevents the third radiator 33 from being affected by hand holding and causing frequency deviation problems. It can be seen from the efficiency curve that the efficiency of the GPS-L1 antenna in the middle of the top edge 321 of the electronic device 1000 in the right-hand holding scenario is nearly 5dB lower than the peak efficiency in free space. The reasons for the efficiency reduction mainly include: 1. The efficiency reduction caused by the folding of the electronic device 1000; 2. The influence of energy absorption by the human body when holding the hand.

[0218] See also Fig.36 , Fig.36 The S curve and efficiency curve of the GPS-L1 antenna with parasitic branches and the GPS-L1 antenna without parasitic branches provided in this embodiment and arranged in the middle of the top edge 321 of the electronic device 1000 (folded state). Among them, curve a1 is the S curve of the GPS-L1 antenna without parasitic branches, curve a2 is the S curve of the GPS-L1 antenna with parasitic branches, curve b1 is the radiation efficiency curve of the GPS-L1 antenna without parasitic branches, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with parasitic branches, curve c1 is the total efficiency curve of the GPS-L1 antenna without parasitic branches, and curve c2 is the total efficiency curve of the GPS-L1 antenna with parasitic branches.

[0219] from Fig.35 and Fig.36 It can be seen from the efficiency curve that by adding parasitic branches, the overall radiation efficiency of the GPS-L1 antenna provided in the embodiment of the present application in the right-hand holding scenario is improved, and the efficiency bandwidth is also improved.

[0220] See also Fig.37 , Fig.37 The S curve and efficiency curve of the GPS-L1 antenna without parasitic branches and the GPS-L1 antenna with parasitic branches (second radiator 22) are arranged in the middle of the top edge 321 of the electronic device 1000 (folded state) in the right hand holding scenario. Among them, curve a1 is the S curve of the GPS-L1 antenna without parasitic branches, curve a2 is the S curve of the GPS-L1 antenna with parasitic branches (second radiator 22), curve b1 is the radiation efficiency curve of the GPS-L1 antenna without parasitic branches, curve b2 is the radiation efficiency curve of the GPS-L1 antenna with parasitic branches (second radiator 22), curve c1 is the total efficiency curve of the GPS-L1 antenna without parasitic branches, and curve c2 is the total efficiency curve of the GPS-L1 antenna with parasitic branches (second radiator 22).

[0221] from Fig.37 It can be seen from the efficiency curve in that after adding the second radiator 22 and the third radiator 33 to couple, the efficiency of the GPS frequency band in the handheld scenario is significantly improved, and the peak efficiency is increased by nearly 3dB.

[0222] The above embodiments of the present application can be combined with each other to realize a group of antennas that can support LB band + GPS-L1 band + MHB band; the antenna assembly 100 realizes anti-hand-holding, dielectric loading, and anti-folding by designing the grounding position, feeding position, and free end position of the LB antenna; the MHB antenna reuses some branches on the LB antenna as parasitic branches to improve the efficiency of the MHB 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 MHB antenna branches as parasitic branches of the GPS-L1 antenna, improve the efficiency of the GPS-L1 antenna when folded, and ensure the performance after folding.

[0223] Although the embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. An electronic device, characterized in that: include: A frame, the frame comprising a top edge, a first side edge, a bottom edge and a second side edge connected in sequence, the first side edge comprising a finger overlap area and a palm grip area, the finger overlap area being located on a side of the palm grip area away from the bottom edge; An antenna assembly, comprising a first radiator and a first signal source, wherein the first radiator comprises a first free end, a first feeding point and a first grounding end which are arranged in sequence, wherein 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 a 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 resonance mode supporting a first frequency band. The first radiator also includes a target radiation segment, which is at least a part of a strong current distribution segment under the first resonance mode. At least part of the target radiation segment is arranged in the palm holding area of ​​the first side, and the target radiation segment is used to form a dielectric loading for the first resonance mode when held in the palm.

2. The electronic device according to claim 1, wherein: The target radiation section includes a first radiation section and a second radiation section, the first radiation section includes the first ground end, and the second radiation section includes the first feeding point.

3. The electronic device according to claim 2, characterized in that: The first feeding point is located between the midpoint of the first radiator and the first grounding end, and the first radiating section is continuous with the second radiating section.

4. The electronic device according to claim 3, characterized in that: The first resonant mode forms a 1 / 4 wavelength mode supporting the first frequency band between the first ground point and the first free end.

5. The electronic device according to any one of claims 1 to 4, characterized in that: The efficiency of the target radiation section after dielectric loading on the first resonance mode is greater than the efficiency of the target radiation section without dielectric loading on the first resonance mode.

6. The electronic device according to any one of claims 1 to 4, characterized in that: The first grounding end is located in the palm holding area.

7. The electronic device according to any one of claims 1 to 4, characterized in that: The finger overlapping area is the overlapping area under the first holding scenario, and the palm holding area is the holding area under the second holding scenario, wherein the first holding scenario is left-hand holding, and the second holding scenario is right-hand holding; or, the first holding scenario is right-hand holding, and the second holding scenario is left-hand holding.

8. The electronic device according to claim 1, wherein: The antenna assembly further includes a second radiator, which is disposed on the bottom edge. The second radiator includes a second free end and a second ground end, and a coupling gap is formed between the second free end and the first free end.

9. The electronic device according to claim 8, characterized in that: The second radiator also includes a second feeding point located between the second ground end and the second free end; the antenna assembly also includes a second signal source, which is electrically connected to the second feeding point to excite the second radiator to form a second resonant mode supporting a second frequency band, and the resonant current of the second resonant mode is distributed between the second ground end and the second free end, and the second resonant mode is a 1 / 4 wavelength mode of the second frequency band.

10. The electronic device according to claim 9, characterized in that: The first radiator further includes a tuning point, the tuning point is located at the bottom edge, and the tuning point is located at a side of the first free end away from the second free end; The antenna assembly further comprises a first tuning circuit, one end of which is electrically connected to the tuning point, and the other end of which is grounded; the first tuning circuit is used to ground the resonant current of the second resonant mode.

11. The electronic device according to claim 10, characterized in that: The second resonant mode includes a first sub-mode and a second sub-mode, wherein 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 the current intensity of the second sub-current, and the current direction of the first sub-current is the same as the current direction 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 the current intensity of the third sub-current, and the current direction of the third sub-current is opposite to the current direction of the fourth sub-current.

12. The electronic device according to claim 11, characterized in that: The first sub-mode forms a 1 / 4 wavelength mode supporting the 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 the second sub-frequency band between the first free end and the tuning point, and the center frequency of the second sub-frequency band is greater than the center frequency 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 dual-wave resonance supporting the second frequency band, and the second frequency band includes the MHB band.

13. The electronic device according to claim 8, characterized in that: The first resonant mode includes a fifth sub-mode and a sixth sub-mode, the fifth sub-mode forms a fifth sub-current between the first ground terminal and the first free terminal, and forms a sixth sub-current between the second free terminal and the second ground terminal, the current intensity of the fifth sub-current is greater than the current intensity of the sixth sub-current, and the current direction of the fifth sub-current is the same as the current direction of the sixth sub-current; The sixth sub-mode forms a seventh sub-current between the first ground terminal and the first free end, and an eighth sub-current between the second free end and the second ground terminal. The current intensity of the eighth sub-current is greater than the current intensity 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 according to claim 13, characterized in that: The fifth sub-mode forms a 1 / 4 wavelength mode supporting the 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 the fourth sub-frequency band between the second free end and the second ground end, and the center frequency of the fourth sub-frequency band is greater than the center frequency of the third sub-frequency band; the third sub-frequency band is continuous with the fourth sub-frequency band and forms 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 according to any one of claims 8 to 14, characterized in that: The electronic device is a foldable electronic device, comprising 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 comprises a top edge, the second body comprises a bottom edge, when the electronic device is in the unfolded state, the top edge and the bottom edge are respectively located on opposite sides of the electronic device, and when the electronic device is in the folded state, the top edge and the bottom edge overlap in the thickness direction.

16. The electronic device according to claim 15, characterized in that: The antenna assembly further includes a third radiator and a third signal source, wherein the third radiator is disposed on the top edge, and the third radiator includes a third free end, a third feeding point and a third grounding end which are sequentially arranged; the third signal source is electrically connected to the third feeding point to excite the third radiator to generate a third resonance mode supporting a third frequency band; When the electronic device is in a 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, the third radiator is opposite to and coupled with at least part of the second radiator.

17. The electronic device according to claim 16, characterized in that: 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 according to claim 16, characterized in that: When the electronic device is in a 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 terminal and the third free terminal, and forms a tenth sub-current between the second free terminal and the second ground terminal, the current intensity of the ninth sub-current is greater than the current intensity of the tenth sub-current, and the current direction of the ninth sub-current is the same as the current direction of the tenth sub-current; The sixth sub-mode forms an eleventh sub-current between the third ground terminal and the third free end, and forms a twelfth sub-current between the second free end and the second ground terminal, the current intensity of the twelfth sub-current is greater than the current intensity of the eleventh sub-current, and the current direction of the twelfth sub-current is opposite to the current direction of the eleventh sub-current.

19. The electronic device according to claim 18, characterized in that: The fifth sub-mode forms a 1 / 4 wavelength mode supporting the 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 the sixth sub-frequency band between the second free end and the second ground end, and the center frequency of the fifth sub-frequency band is greater than the center frequency 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 resonance supporting the third frequency band.

20. The electronic device according to claim 16, characterized in that: The third frequency band includes the GPS-L1 frequency band, and the first frequency band includes the LB frequency band.

21. The electronic device according to claim 16, characterized in that: The top edge includes a first end and a second end that are oppositely disposed, and a 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 grounding end and the midpoint of the top edge is less than or equal to a second preset distance; The bottom edge includes a third end and a fourth end arranged opposite to each other, the distance between the second grounding end and the third end is smaller than the distance between the second grounding end and the fourth end, and the distance between the second grounding end and the third end is greater than or equal to the first preset distance.

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