An electronic device

Abstract

The application provides an electronic device comprising a graphene film, the graphene film comprising regions with different resistance values, the graphene film as a whole can be used as a heat dissipation member of the electronic device, and a low-resistance region of the graphene film can be used as a radiator of an antenna structure, so that the radiation characteristics of the antenna and the heat dissipation performance of the heat dissipation member can be considered, and the contradiction between the two can be effectively solved.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of wireless communication technology, the past second generation (2G) mobile communication system mainly supports the function of call, and the electronic device is only a tool for people to send and receive short messages and voice communication. The wireless Internet function is extremely slow because the data transmission uses a voice channel for transmission. Nowadays, in addition to being used for calling, sending short messages, and taking pictures, electronic devices can also be used for online music listening, network video watching, real-time video, etc., covering various applications such as calling, video entertainment, and e-commerce in people's life. Among them, a variety of functional applications need to upload and download data through wireless networks, so the high-speed transmission of data becomes extremely important.

[0003] With the increasing demand for high-speed data transmission, the development trend of the industrial design (ID) of electronic devices is large screen ratio and multiple cameras. This has caused a significant reduction in antenna clearance, and the layout space is increasingly limited. At the same time, many new communication specifications have emerged, which require more antennas to be laid out in the mobile phone. The fifth generation (5G) wireless communication system also requires more and more antennas. SUMMARY

[0004] The present application provides an electronic device, including a graphene film, the graphene film includes regions with different resistance values, the whole graphene film can be used as a heat dissipation component of the electronic device, and the low-resistance region can be used as a radiator of an antenna structure, which can balance the radiation characteristics of the antenna and the heat dissipation performance of the heat dissipation component, effectively solving the contradiction between the two.

[0005] In a first aspect, an electronic device is provided, including: a graphene film, the graphene film including a first region and a second region, the graphene film of the first region having a greater electrical conductivity than the graphene film of the second region, and / or the graphene film of the first region having a smaller electrical resistance value than the graphene film of the second region; and an antenna structure, a first radiator of the antenna structure including the graphene film of the first region.

[0006] According to the embodiments of the present application, by multiplexing the graphene film, the problem of mutual influence between the heat dissipation component and the radiator of the antenna structure in the electronic device is solved. The graphene film of the first region with low resistance (high conductivity) can be used as a radiator of the antenna structure to produce radiation outward to receive / transmit radio frequency signals.

[0007] With reference to the first aspect, in some implementations of the first aspect, the electronic device further includes a heat generating device, and the graphene film is arranged to face the heat generating device.

[0008] According to the embodiment of the present application, since the graphene film is a complete film, there is no interval between the first region and the second region, and the graphene film in the first region and the graphene film in the second region can be regarded as a whole graphene film, so that the heat conducted by the heat source can be uniformly distributed on the whole graphene film, thereby achieving the purpose of cooling the overheated electronic element.

[0009] With reference to the first aspect, in some implementations of the first aspect, the electrical conductivity of the graphene film in the first region is greater than or equal to 10 4 S / m, and the electrical conductivity of the graphene film in the second region is less than or equal to 10 S / m.

[0010] According to the embodiment of the present application, in this case, when the graphene film in the first region is used as a radiator of an antenna structure, the graphene film in the second region can be regarded as an insulating material, thereby avoiding affecting the graphene film in the first region as the radiator of the antenna structure.

[0011] With reference to the first aspect, in some implementations of the first aspect, the electrical resistance of the graphene film in the first region is less than or equal to 20 Ω.

[0012] With reference to the first aspect, in some implementations of the first aspect, the electrical resistance of the graphene film in the second region is greater than or equal to 20 times the electrical resistance of the graphene film in the first region.

[0013] According to the embodiment of the present application, in this case, when the graphene film in the first region is used as a radiator of an antenna structure, the graphene film in the second region can be regarded as an insulating material, thereby avoiding affecting the graphene film in the first region as the radiator of the antenna structure.

[0014] With reference to the first aspect, in some implementations of the first aspect, the graphene film further includes a third region, the electrical conductivity of the third region is between the electrical conductivity of the graphene film in the first region and the electrical conductivity of the graphene film in the second region, and / or the electrical resistance of the third region is between the electrical resistance of the graphene film in the first region and the electrical resistance of the graphene film in the second region.

[0015] According to the embodiment of the present application, for the graphene film provided by the embodiment of the present application, it can include multiple regions with different electrical resistances or different electrical conductivities, and be applied to different antenna structures or design schemes, and the present application does not limit this, and the actual production or design requirements can be adjusted.

[0016] With reference to the first aspect, in some implementations of the first aspect, the electronic device further includes a feeding unit and a feeding element; one end of the feeding element is electrically connected to the feeding unit, and the other end of the feeding element directly feeds or couples to feed the first radiator.

[0017] According to the embodiments of the present application, the feeding unit can be electrically connected to the graphene film in the first area through the feeding element (metallic spring or foam), and feed the radiator of the antenna structure formed by the graphene film in the first area by direct feeding. The feeding unit can also be coupled to the graphene film in the first area through the feeding element, and feed the radiator of the antenna structure formed by the graphene film in the first area by coupling feeding. Therefore, the characteristics of the radiator of the antenna structure can be adjusted by adjusting the size of the feeding element, or by adjusting the distance between the feeding element and the graphene film in the first area (for example, the feeding element is arranged on the surface of the support), and the adjustment can be made according to the actual design, which is not limited in the present application.

[0018] With reference to the first aspect, in some implementations of the first aspect, the antenna structure is at least one of the following: a monopole antenna, a dipole antenna, a Yagi antenna, a near field communication (NFC) antenna, a loop antenna, a log-periodic antenna, a T-shaped antenna, an inverted L-shaped antenna, an inverted F-shaped antenna, or a planar inverted F-shaped antenna.

[0019] According to the embodiments of the present application, the graphene film with low resistance and the graphene film with high resistance can be mixed and arranged, and other types of antenna structures can be designed, and the adjustment can be made according to the actual design requirements. In addition, a plurality of different types of antenna structures can be arranged on the same graphene film, which is not limited in the present application, and the adjustment can be made according to the actual design requirements.

[0020] With reference to the first aspect, in some implementations of the first aspect, the electronic device further includes a printed circuit board (PCB), a display screen, and a back cover; the PCB is arranged in a space enclosed by the display screen and the back cover; at least a part of the graphene film is arranged between the PCB and the back cover.

[0021] With reference to the first aspect, in some implementations of the first aspect, the electronic device further includes a frame, the second radiator of the antenna structure includes a conductive part between a first position and a second position of the frame; the first radiator and the second radiator are arranged opposite to each other, the projection of the first radiator and the second radiator in a first direction at least partially overlaps, and the first direction is perpendicular to the length direction of the second radiator.

[0022] With reference to the first aspect, in some implementations of the first aspect, the electronic device further includes a feeding unit; one end of the feeding unit is electrically connected with the second radiator to feed the antenna structure.

[0023] According to the embodiment of the present application, the feeding unit can be electrically connected with the metal part to feed the antenna structure formed by the metal part. In the antenna structure, the metal part serves as the main radiator. Since the first region of the graphene film is arranged opposite to the metal part, when the feeding unit feeds, the first region of the graphene film can be coupled to the electrical signal through space, and then generate radiation, which can serve as a parasitic branch of the antenna structure to expand the working bandwidth of the antenna structure to meet the needs of the communication frequency band.

[0024] With reference to the first aspect, in some implementations of the first aspect, the electronic device further includes a battery; the battery is arranged in the space surrounded by the middle frame and the display screen; at least a part of the graphene film is arranged between the battery and the back cover.

[0025] According to the embodiment of the present application, the part of the graphene film can be arranged between the battery and the back cover to serve as a low-heat area. The part of the graphene film can also not be arranged between the battery and the back cover. The placement position of the heat dissipation member can be changed according to the actual layout in the electronic device, which is not limited in the present application.

[0026] With reference to the first aspect, in some implementations of the first aspect, the graphene film includes a plurality of first regions, and the plurality of first regions are arranged in order.

[0027] According to the embodiment of the present application, the plurality of first regions are arranged in order, and the plurality of first regions can serve as the radiators of the meta-patch antenna

[0028] With reference to the first aspect, in some implementations of the first aspect, the thickness of the graphene film of the first region is different from the thickness of the graphene film of the second region.

[0029] According to the embodiment of the present application, the thicker the thickness of the graphene film, the lower the resistance value of the corresponding graphene film, and the higher the conductivity of the graphene film. The thinner the thickness of the graphene film, the higher the resistance value of the corresponding graphene film, and the lower the conductivity of the graphene film. The thickness of the graphene film of the first region and the thickness of the graphene film of the second region can be adjusted by engraving or peeling (for example, laser engraving) on the complete graphene film.

[0030] With reference to the first aspect, in some implementations of the first aspect, the heat generating device is a chip.

[0031] According to the embodiment of the present application, the heat generating device can be a processing chip in the electronic device, or other types of chips. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of an electronic device provided by an embodiment of the present application.

[0033] Figure 2 is a schematic diagram of the relative positions of the heat dissipating member and the patch antenna in the electronic device provided by the present application.

[0034] Figure 3 is a schematic diagram of a cross section of an electronic device provided by an embodiment of the present application.

[0035] Figure 4 is a schematic diagram of an antenna structure provided by an embodiment of the present application. Figure 3 is a schematic diagram of the structure of the electronic device shown in

[0036] Figure 5 is a schematic diagram of an antenna structure provided by an embodiment of the present application.

[0037] Figure 6 is a schematic diagram of an antenna structure using direct feeding.

[0038] Figure 7 is a schematic diagram of an antenna structure using direct feeding.

[0039] Figure 8 is a schematic diagram of an antenna structure using coupling feeding.

[0040] Figure 9 is an antenna structure provided by an embodiment of the present application.

[0041] Figure 10 is a schematic diagram of the structure of the electronic device shown in Figure 9 is a simulation diagram of the S parameters of the first antenna unit in the antenna structure shown in

[0042] Figure 11 is a simulation diagram of the S parameters of the second antenna unit in the antenna structure shown in Figure 9

[0043] is a simulation diagram of the S parameters of the third antenna unit in the antenna structure shown in Figure 12 Figure 9 is a simulation diagram of the S parameters of the fourth antenna unit in the antenna structure shown in

[0044] Figure 13 Figure 9 is a simulation diagram of the S parameters of the fourth antenna unit in the antenna structure shown in

[0045] Figure 14 is a schematic diagram of a near field communication antenna provided by an embodiment of the present application.

[0046] Figure 15 ​​is a schematic diagram of a Yagi antenna provided by an embodiment of the present application.

[0047] Figure 16 is a schematic diagram of an antenna structure layout provided by an embodiment of the present application.

[0048] Figure 17 is a schematic diagram of another antenna structure layout provided by an embodiment of the present application.

[0049] Figure 18 is a schematic diagram of yet another antenna structure layout provided by an embodiment of the present application.

[0050] Figure 19 is a schematic diagram of an electronic device 300 provided by an embodiment of the present application.

[0051] Figure 20 is a schematic diagram of another electronic device provided by an embodiment of the present application.

[0052] Figure 21 is a schematic diagram of an antenna structure provided by an embodiment of the present application. DETAILED DESCRIPTION

[0053] The technical solutions in the present application will be described below with reference to the drawings.

[0054] It should be understood that in the present application, "electrically connected" can be understood as physical contact and electrical conduction of components; it can also be understood as a form of connection between different components in a circuit structure through a solid line that can transmit electrical signals such as a copper foil or a wire of a printed circuit board (PCB). "Coupling" can be understood as electrically conducting through indirect coupling. It is understood by those skilled in the art that coupling refers to the close cooperation and mutual influence between the input and output of two or more circuit components or electrical networks, and the phenomenon of transmitting electrical signals from one side to the other through mutual interaction. "Connected" and "connected" can refer to a mechanical connection relationship or a physical connection relationship, for example, A and B are connected or A and B are connected, which means that there is a fastening component (such as a screw, a bolt, a rivet, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0055] The technical solutions provided in this application are applicable to electronic devices that adopt one or more of the following communication technologies: Bluetooth (BT) communication technology, global positioning system (GPS) communication technology, wireless fidelity (WiFi) communication technology, global system for mobile communications (GSM) communication technology, wideband code division multiple access (WCDMA) communication technology, long term evolution (LTE) communication technology, 5G communication technology, and other future communication technologies. The electronic devices in the embodiments of this application can be mobile phones, tablet computers, laptops, smart homes, smart bracelets, smart watches, smart helmets, smart glasses, etc. The electronic device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, an electronic device in a 5G network, or an electronic device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited to this. Figure 1 The electronic device provided in this application is exemplified, and the electronic device is described as a mobile phone.

[0056] like Figure 1 As shown, the electronic device 10 may include: a cover 13, a display / module 15, a printed circuit board (PCB) 17, a middle frame 19, and a rear cover 21. It should be understood that in some embodiments, the cover 13 may be a glass cover, or may be replaced with a cover made of other materials, such as an ultra-thin glass cover, a PET (Polyethylene terephthalate) cover, etc.

[0057] The cover plate 13 may be disposed closely against the display module 15 , and may be mainly used to protect the display module 15 and prevent dust.

[0058] In an embodiment, the display module 15 can include a liquid crystal display (LCD), a light emitting diode (LED) display panel, or an organic light-emitting diode (OLED) display panel, etc., which are not limited in the present application.

[0059] The middle frame 19 mainly plays a supporting role for the whole machine. Figure 1 As shown in the figure, the PCB 17 is arranged between the middle frame 19 and the back cover 21, and it can be understood that in other embodiments, the PCB 17 can also be arranged between the middle frame 19 and the display module 15, which are not limited in the present application. The printed circuit board PCB 17 can use a flame-retardant material (FR-4) dielectric plate, a Rogers dielectric plate, a mixed dielectric plate of Rogers and FR-4, etc. Here, FR-4 is a code of a flame-retardant material grade, and the Rogers dielectric plate is a high-frequency board. The PCB 17 carries electronic components such as radio frequency chips. The side of the printed circuit board PCB 17 close to the middle frame 19 can be provided with a metal layer, which can be formed by etching metal on the surface of the PCB 17. The metal layer can be used for grounding the electronic components carried on the printed circuit board PCB 17 to prevent user electric shock or equipment damage. The metal layer can be referred to as a PCB floor. The electronic device 10 can also have other floors for grounding, such as a metal middle frame 19, etc., and generally, the "grounding floor" refers to any of the above floors or a combination thereof.

[0060] The electronic device 10 can also include a battery (not shown in the figure). The battery can be arranged between the middle frame 19 and the back cover 21, or can be arranged between the middle frame 19 and the display module 15, which are not limited in the present application. In some embodiments, the PCB 17 is divided into a main board and a sub-board, and the battery can be arranged between the main board and the sub-board, wherein the main board can be arranged between the middle frame 19 and the upper edge of the battery, and the sub-board can be arranged between the middle frame 19 and the lower edge of the battery.

[0061] The electronic device 10 can further include a bezel 11, which can be formed of a conductive material such as metal. The bezel 11 can be disposed between the display module 15 and the back cover 21 and extend circumferentially around the periphery of the electronic device 10. The bezel 11 can have four sides that surround the display module 15 and help secure the display module 15. In one implementation, the bezel 11 made of metal material can be directly used as a metal bezel of the electronic device 10, forming a metal bezel appearance, suitable for a metal industrial design (ID). In another implementation, the outer surface of the bezel 11 can also be a non-metal material, such as a plastic bezel, forming a non-metal bezel appearance, suitable for a non-metal ID.

[0062] The middle frame 19 can include the bezel 11, or the bezel 11 can include a protrusion extending inward to connect with the middle frame 19. The protrusion of the bezel 11 can also be used to receive a feed signal, so that at least part of the bezel 11 acts as a radiator of an antenna to transmit / receive radio frequency signals.

[0063] The back cover 21 can be a back cover made of metal material, or a back cover made of non-conductive material, such as a glass back cover, a plastic back cover, or other non-metal back cover.

[0064] The cover plate 13, the back cover 21, the bezel 11, and / or the middle frame 19 can be collectively referred to as a housing or a shell of the electronic device 10. It should be understood that "housing" can be used to refer to part or all of any one of the cover plate 13, the back cover 21, the bezel 11, or the middle frame 19, or part or all of any combination of the cover plate 13, the back cover 21, the bezel 11, or the middle frame 19.

[0065] Figure 1 Only some components included in the electronic device 10 are shown schematically, and the actual shape, actual size, and actual structure of these components are not limited by Figure 1 the drawings.

[0066] It should be understood that in this application, the face where the display screen of the electronic device is located is considered as the front face, the face where the back cover is located is considered as the back face, and the face where the bezel is located is considered as the side face.

[0067] It should be understood that in this application, when a user holds (usually vertically and faces the screen) the electronic device, the orientation of the electronic device is considered to have a top, a bottom, a left side, and a right side.

[0068] With the development of 5G wireless communication systems, the number of antennas has greatly increased, and it is necessary to provide antennas on the back of the electronic device, such as Figure 2As shown. The antenna installed on the back of the electronic device is generally a patch antenna. In order not to affect the radiation performance of the antenna, the back cover of the electronic device has begun to evolve towards non-metallic. However, the power consumption of the chip corresponding to the 5G wireless communication system will be about 2.5 times that of the 4G. The power consumption and heat generation during operation will increase sharply. Since the back cover of the electronic device is non-metallic, the heat dissipation effect is poor and additional heat dissipation design is required, such as Figure 2 As shown, the graphene film is used as a heat sink to transfer the heat generated in the high-temperature area (the area where the chip on the PCB is located) to the low-temperature area (the area where the battery is located), so that the heat is evenly distributed.

[0069] It should be understood that patch antennas typically require a large area to achieve high over-the-air (OTA) performance and low specific absorption rate (SAR). However, because the graphene film used as a heat sink is large and needs to remain intact to achieve heat dissipation, it essentially occupies most of the space on the back of the electronic device. Therefore, the required number of antennas in a device and the heat dissipation requirements are in sharp conflict.

[0070] An embodiment of the present application provides an electronic device, including a graphene film, which includes regions with different resistance values. The graphene film as a whole can be used as a heat sink for the electronic device, and its low resistance region can be used as a radiator of the antenna structure. It can take into account the radiation characteristics of the antenna and the heat dissipation performance of the heat sink, effectively resolving the contradiction between the two.

[0071] Figure 2 and Figure 3 Schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Figure 3 This is a schematic cross-sectional view of an electronic device provided in an embodiment of the present application. Figure 3 yes Figure 2 Schematic diagram of the structure of the electronic equipment shown.

[0072] like Figure 3 As shown, the graphene film 110 may include a first region 111 and a second region 112. The conductivity of the graphene film in the first region 111 is greater than that of the graphene film in the second region 112, or the resistance of the graphene film in the first region 111 is less than that of the graphene film in the second region 112. The radiator of the antenna structure in an electronic device may include the graphene film 110 in the first region. Electrical conductivity, also known as electrical conductivity, can be used to describe the ease with which charge flows in a substance. There is a correlation between electrical conductivity and resistance. Generally speaking, high conductivity corresponds to low resistance, and low conductivity corresponds to high resistance.

[0073] As shown in Figure 3 The electronic device includes a heat generating device, and the graphene film 110 can be disposed above the heat generating device to transfer heat generated by the heat generating device when the heat generating device is working, so as to avoid overheating of the heat generating device and affect the working efficiency of the heat generating device. In an embodiment, the heat generating device can be a processing chip in the electronic device, or other types of chips.

[0074] It should be understood that by multiplexing the graphene film 110, the problem of mutual influence between the heat dissipation component and the radiator of the antenna structure in the electronic device is solved. The graphene film 110 provided in the embodiments of the present application can absorb heat generated by part of the heat source (heat generating device, for example, processor, etc.) and uniformly distribute the absorbed heat on the graphene film 110. In the embodiments of the present application, the graphene film 110 is a complete film, and there is no interval between the first region 111 and the second region 112. The graphene film in the first region 111 and the graphene film in the second region 112 serve as a whole graphene film, so that the heat conducted at the heat source can be uniformly distributed on the entire graphene film to achieve the purpose of cooling the overheated electronic element. At the same time, the graphene film 110 in the first region with low resistance (high conductivity) can serve as the radiator of the antenna structure to produce radiation outward to receive / transmit radio frequency signals.

[0075] Figure 4 As shown in the figure, the electronic device can include a PCB 17, a display screen, and a back cover.

[0076] In the embodiments of the present application, the graphene film 110, the PCB 17, and the battery 20 are disposed between the middle frame 19 and the back cover. The graphene film 110, the PCB 17, and the battery 20 can also be disposed between the display screen and the back cover. At least part of the graphene film 110 can be disposed between the PCB 17 and the back cover.

[0077] In an embodiment, the heat generating device can be disposed on the PCB 17. It should be understood that the heat generating device can also be disposed on a flexible printed circuit (FPC) or a low pin count (LPC) bus, which is not limited in the present application.

[0078] In an embodiment, the electronic device can further include a battery 20, and part of the graphene film 110 can be disposed between the battery 20 and the back cover. Part of the graphene film 110 can also be disposed in other regions in the housing. The placement position of the heat dissipation component can be changed according to the actual layout in the electronic device, which is not limited in the present application.

[0079] In one embodiment, the graphene film 110 arranged between the battery 20 and the back cover is partially used as a low-heat area, and thus the graphene film 110 can be used as a heat dissipation component to transfer at least part of the heat generated by a heat source (a heat generating device such as a processor) to the low-heat area (for example, an area where the battery is located).

[0080] In one embodiment, a plurality of first areas 111 can be arranged on the graphene film 110. In the embodiment of the present application, four first areas 111 are taken as an example, four antenna units can be formed to meet the demand of the number of antennas in the 5G wireless communication system, and can be applied to a multi-input multi-output (MIMO) antenna system, and can also be applied to other communication systems. At the same time, the graphene film in the second area 112 between the four first areas 111 has a high resistance value (low conductivity), and thus can be used as an insulating material to prevent the graphene films in the four first areas 111 from affecting each other when they are used as radiators of an antenna structure.

[0081] In one embodiment, a third area can also be arranged on the graphene film 110. The graphene film in the third area has a resistance value between that of the graphene film in the first area 111 and that of the graphene film in the second area 112, and has a conductivity between that of the graphene film in the first area 111 and that of the graphene film in the second area 112. It should be understood that the graphene film 110 provided in the embodiment of the present application can include a plurality of areas with different resistance values or different conductivities, and the present application does not limit this. The actual production or design requirements can be adjusted.

[0082] In one embodiment, the graphene film in the first area 111 has a resistance value less than or equal to 20Ω, and the graphene film in the first area 111 can be used as a radiator of an antenna structure. The graphene film in the second area 112 has a resistance value greater than or equal to 20 times the resistance value of the graphene film in the first area 111, for example, 400Ω. In this case, when the graphene film in the first area 111 is used as a radiator of an antenna structure, the graphene film in the second area 112 can be considered as an insulating material to avoid affecting the graphene film in the first area 111 as a radiator of an antenna structure.

[0083] In one embodiment, the graphene film in the first area 111 has a conductivity greater than or equal to 10 4S / m, the graphene film of the first region 111 can be a radiator of the antenna structure. The graphene film of the second region 112 can have an electrical conductivity less than or equal to 10 S / m. In this case, when the graphene film of the first region 111 is a radiator of the antenna structure, the graphene film of the second region 112 can be considered as an insulating material, avoiding affecting the graphene film of the first region 111 as a radiator of the antenna structure.

[0084] In one embodiment, the graphene film 110 can be provided with an insulating layer close to the surface of the electronic device middle frame 19, avoiding the short circuit between the graphene film of the first region and the shielding cover 171 on the battery 20 or the PCB 17.

[0085] In one embodiment, the insulating layer can be an adhesive, such as a heat-conducting gel, for tightly contacting the graphene film 110 with the heat source on the PCB.

[0086] In one embodiment, the graphene film of the first region 111 can have a smaller electrical resistance or a larger electrical conductivity than the graphene film of the second region 112 in various ways. For example, the graphene film can be prepared in any of the following ways:

[0087] 1. During the preparation of the graphene film, the electrical resistance of the graphene film is mainly controlled in the processes of annealing and rolling. The higher the annealing temperature and the greater the rolling pressure, the lower the electrical resistance and the higher the electrical conductivity of the graphene film. The lower the annealing temperature and the smaller the rolling pressure, the higher the electrical resistance and the lower the electrical conductivity of the graphene film. The annealing temperature and the rolling pressure during the preparation of the graphene film of the first region 111 and the graphene film of the second region 112 can be adjusted to achieve a smaller electrical resistance or a larger electrical conductivity of the graphene film of the first region 111 than that of the graphene film of the second region 112.

[0088] 2. For the graphene films prepared under the same annealing temperature and rolling pressure, the thicker the graphene film, the lower the electrical resistance and the higher the electrical conductivity of the corresponding graphene film. The thinner the graphene film, the higher the electrical resistance and the lower the electrical conductivity of the corresponding graphene film. The thickness of the graphene film of the first region 111 and the thickness of the graphene film of the second region 112 can be adjusted by engraving or peeling (e.g., laser engraving) on the complete graphene film. For example, as shown in FIG. 2, the graphene film of the first region 111 can be engraved to have a smaller thickness than the graphene film of the second region 112. Figure 5As shown, the thickness of the graphene film in the second region can be reduced by laser etching on the graphene film with a low resistance value (for example, the resistance value can be less than or equal to 20Ω), and the graphene film in the second region 112 can enclose the graphene film in the first region 111, so that the graphene film in the first region as the radiator of the antenna structure is separated from other regions with low resistance values.

[0089] 3. Two graphene films with different resistance values (conductivity) are prepared respectively, and the two graphene films are cut to the required size and bonded by a heat-conducting gel to form the graphene film 110 in the above embodiment.

[0090] It should be understood that, by the above preparation method or other preparation methods, the graphene film in the embodiment of the present application is obtained, and the first region and the second region of the graphene film form a complete graphene film. In the electronic device, since the graphene film in the first region and the graphene film in the second region are an integral complete film, the heat conducted at the heat source can still be transmitted at the connection between the first region and the second region, and uniformly distributed on the entire graphene film, so as to achieve the purpose of cooling the overheated electronic components.

[0091] Figures 6 to 8 is a schematic diagram of an antenna structure 200 provided by the embodiment of the present application. Wherein, Figure 6 and Figure 7 is a schematic diagram of an antenna structure using direct feeding. Figure 8 is a schematic diagram of an antenna structure using coupling feeding.

[0092] As shown in Figure 6 , the electronic device can further include a feeding unit 220, and the feeding unit 230 feeds the radiator of the antenna structure formed by the graphene film in the first region 111.

[0093] In one embodiment, the feeding unit 230 can be a radio frequency channel in a radio frequency chip inside the electronic device.

[0094] As shown in Figure 6 , the feeding unit 220 can be arranged on the PCB 17, and is electrically connected to the graphene film in the first region 111 through a metal spring 251, and feeds the radiator of the antenna structure formed by the graphene film in the first region 111 by direct feeding. Therefore, the distance between the graphene film 210 and the PCB 17 can be about the height of the metal spring 251, for example, the distance between the graphene film and the PCB 220 can be about 5mm, which can be adjusted according to the actual design, and the present application does not limit this.

[0095] Alternatively, as shown in Figure 7As shown, the feeding unit 220 can also be electrically connected to the graphene film of the first area 111 through the foam 252, and feed the radiator of the antenna structure formed by the graphene film of the first area 111 through direct feeding. Therefore, the distance between the graphene film 210 and the PCB 17 can be approximately the thickness of the foam 252, which can be adjusted according to the actual design, and the present application does not limit this.

[0096] Alternatively, as shown in FIG. 2B, the feeding unit 220 can also be indirectly electrically connected to the graphene film of the first area 111 through the coupling member 253, and feed the radiator of the antenna structure formed by the graphene film of the first area 111 through coupling feeding. Therefore, the radiator characteristics of the antenna structure 200 can be adjusted by adjusting the size of the coupling member 253, or by adjusting the distance between the coupling member 253 and the graphene film of the first area 111 (for example, the coupling member 253 is arranged on the surface of the support), which can be adjusted according to the actual design, and the present application does not limit this. Figure 8

[0097] It should be understood that the above-mentioned connectors (metallic spring 251 and foam 252) or coupling member 253 are only a form of feeding unit for the antenna structure, and in actual application, the feeding unit can also feed the antenna structure through other feeding units.

[0098] Figures 9 to 13 is the antenna structure provided by the embodiment of the present application and the corresponding S parameter simulation diagram. Wherein, Figure 9 is an antenna structure provided by the embodiment of the present application. Figure 10 is the S parameter simulation diagram of the first antenna unit in the antenna structure shown in FIG. 1A. Figure 9 is the S parameter simulation diagram of the second antenna unit in the antenna structure shown in FIG. 1B. Figure 11 is the S parameter simulation diagram of the third antenna unit in the antenna structure shown in FIG. 1C. Figure 9 is the S parameter simulation diagram of the fourth antenna unit in the antenna structure shown in FIG. 1D. Figure 12 is the S parameter simulation diagram of the fourth antenna unit in the antenna structure shown in FIG. 1D. Figure 9 is the S parameter simulation diagram of the fourth antenna unit in the antenna structure shown in FIG. 1D. Figure 13 is the S parameter simulation diagram of the fourth antenna unit in the antenna structure shown in FIG. 1D. Figure 9 is the S parameter simulation diagram of the fourth antenna unit in the antenna structure shown in FIG. 1D.

[0099] As shown in FIG. 2A, the thickness of the graphene film with low resistance value can be reduced by laser cutting to produce a region with high resistance value, thereby separating the region as the radiator of the antenna structure from other regions with low resistance value, and ensuring that the graphene film as the radiator of the antenna structure is not affected by other graphene films with low resistance value when working, so as to ensure the radiation performance of the antenna structure. Figure 9 As shown in FIG. 2B, the thickness of the graphene film with low resistance value can be reduced by laser cutting to produce a region with high resistance value, thereby separating the region as the radiator of the antenna structure from other regions with low resistance value, and ensuring that the graphene film as the radiator of the antenna structure is not affected by other graphene films with low resistance value when working, so as to ensure the radiation performance of the antenna structure.

[0100] Figure 9 ​​As shown, the graphene film of the first region of the radiator as the antenna structure is separated from other regions with low resistance values.

[0101] As shown in Figures 10 to 13 The resonances generated by the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit include 3.39-3.61GHz and 4.04-4.21GHz, which can be applied to the N77 (3.3GHz-4.2GHz) frequency band in the 5G frequency band.

[0102] In 3.39-3.61GHz and 4.04-4.21GHz, the S parameters corresponding to the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit are less than -6dB, which can meet the communication requirements. At the same time, the isolation between the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit is less than -10dB, and the first antenna unit, the second antenna unit, the third antenna unit and the fourth antenna unit are used as antenna subunits in the MIMO antenna system and applied to the MIMO antenna system.

[0103] Figure 14 is a schematic diagram of a near field communication antenna provided by an embodiment of the present application.

[0104] In a common near field communication (NFC) antenna design, the radiator of the NFC antenna adopts an FPC form and is wound by a thin metal wire. The radiator is generally copper. The layout is above the PCB or battery. For this design scheme, only the radiation function of the antenna structure, and the heat dissipation function cannot be realized, and conflicts with the layout of the heat dissipation member.

[0105] In order to better utilize the existing space, we use hybrid impedance graphene to make the radiator of the NFC antenna, which can realize both the radiation function and the heat dissipation function.

[0106] As shown in Figure 14 Based on the graphene film with different electrical conductivity or resistance values provided by the embodiments of the present application, the low-resistance graphene film and the high-resistance graphene film are mixed and arranged to design an NFC antenna schematic diagram. From the perspective of the heat dissipation member, it constitutes a whole graphene film, which has good heat dissipation characteristics. From the perspective of the antenna structure, the low-resistance graphene film can act as a radiator of the antenna structure, which has good radiation characteristics. Such design can be used as a design method and application scenario of the NFC antenna in all existing electronic devices.

[0107] Figure 15 is a schematic diagram of a Yagi antenna provided by an embodiment of the present application.

[0108] As shown in Figure 15As shown, a Yagi antenna can be designed by using a mixed arrangement of low-resistance graphene film and high-resistance graphene film, and the steering unit (used to enhance the electrical signal radiated in the direction of the steering unit), the radiation unit (used to generate the radiated electrical signal) and the reflection unit (used to weaken the electrical signal radiated in the direction of the reflection unit) in the Yagi antenna are designed in the low-impedance area of ​​the graphene film to realize the antenna structure of the Yagi antenna.

[0109] It should be understood that, for the embodiments of the present application, a variety of different antenna structures can be designed by using a mixed arrangement of low-resistance graphene films and high-resistance graphene films. For example, a monopole antenna or a dipole antenna can be designed by using a mixed arrangement of low-resistance graphene films and high-resistance graphene films, such as Figure 16 Alternatively, a composite right and left hand (CRLH) or loop antenna can be designed by using a mixed arrangement of low-resistance graphene films and high-resistance graphene films, as shown in FIG. Figure 17 Alternatively, a low-resistance graphene film and a high-resistance graphene film can be mixed and arranged to design an inverted F antenna (IFA), as shown in FIG. Figure 18 As shown. Low-resistance graphene films and high-resistance graphene films can also be mixed and arranged to design other types of antenna structures, such as T-type antennas, log-periodic antennas, inverted L-type antennas (ILA) or planner inverted F-type antennas (PIFA). This application does not limit the type of antenna and can be adjusted according to actual design requirements.

[0110] Furthermore, multiple different types of antenna structures can be provided on the same graphene film. This application does not impose any restrictions on this and can be adjusted according to actual design requirements.

[0111] At the same time, the embodiment of the present application does not limit the position of the radiator of the antenna structure formed by the mixed arrangement of graphene films, and can be set at the bottom or top edge of the graphene film (such as Figure 16 As shown), it can also be set on the side of the graphene film (as shown Figure 17 Alternatively, it can be set in the middle area of ​​the graphene film (as shown in Figure 18 This application does not impose any restrictions on this and can be adjusted according to actual design requirements.

[0112] Figure 19 3 is a schematic structural diagram of an electronic device 300 provided in an embodiment of the present application.

[0113] As shown in Figure 19 , the metal part 310 between the first position 302 and the second position 303 of the metal frame 301 of the electronic device 300 serves as a first radiator of an antenna structure. The first area 321 of the graphene film 320 is a low-resistance area, which can serve as a second radiator of the antenna structure. The first radiator and the second radiator are arranged opposite to each other (the first radiator and the second radiator are arranged face to face), and the projection of the first radiator and the second radiator in a first direction at least partially overlaps, where the first direction is perpendicular to the length direction of the second radiator.

[0114] It should be understood that the feeding unit 340 in the electronic device 300 can be electrically connected with the metal part 310 to feed the antenna structure formed by the metal part 310. In this antenna structure, the metal part 310 serves as a main radiator. Since the first area 321 of the graphene film 320 is arranged opposite to the metal part 310, when the feeding unit 340 feeds, the first area 321 of the graphene film 320 can be coupled to an electrical signal through space, and then generate radiation, which can serve as a parasitic branch of the antenna structure, to expand the operating bandwidth of the antenna structure to meet the needs of the communication frequency band.

[0115] In an embodiment, the distance D1 between the metal part 310 and the first area 321 of the graphene film 320 can be controlled to adjust the electrical signal to which the parasitic branch in the antenna structure is coupled, and then adjust the radiation characteristics generated by the parasitic branch. The distance between the metal part 310 and the first area 321 of the graphene film 320 can be understood as the minimum value of the straight-line distance between a point on the metal part 310 and a point in the first area 321 of the graphene film 320.

[0116] In an embodiment, the metal part can also be arranged at other positions of the metal frame, for example, at the intersection of two edges of the metal frame, as shown in Figure 20 .

[0117] It should be understood that the low-impedance area in the graphene film 320 can serve as a parasitic branch of an antenna structure, which can not only be applied to the frame antenna of an electronic device, but also be applied to other types of antenna structures, such as a floating metal (FLM) antenna, a flexible printed circuit (FPC) antenna, or a laser-direct-structuring (LDS) antenna, etc. The present application does not limit this, and the adjustment can be made according to the actual design requirements.

[0118] Figure 21 is a schematic diagram of an antenna structure provided by an embodiment of the present application.

[0119] As shown in Figure 21 The graphene film includes a plurality of first regions 411, which are arranged in order and can serve as radiators of meta patch antennas (a meta structure is a kind of metamaterial structure, which can be a plurality of closely coupled units instead of a single radiator).

[0120] It should be understood that the plurality of first regions 411 arranged in order can be understood as being arranged in an array, or arranged in a certain rule, for example, arranged in an F shape, arranged in an L shape, etc., which is not limited in the present application. The plurality of first regions 411 with low resistance values arranged in order can be coupled between two adjacent first regions 411, so that the plurality of first regions 411 can serve as complete radiators of antenna structures to produce radiation.

[0121] Those skilled in the art can use different methods to achieve the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0122] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0123] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical or other forms.

[0124] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electronic device, comprising: comprise: A graphene film including a first region and a second region, an electrical conductivity of the graphene film of the first region being greater than or equal to 10 4 S / m, an electrical conductivity of the graphene film of the second region being less than or equal to 10 S / m, and / or a resistance value of the graphene film of the first region being less than or equal to 20 Ω, a resistance value of the graphene film of the second region being greater than or equal to 20 times the resistance value of the graphene film of the first region; and The antenna structure comprises a first radiator comprising the graphene film of the first region.

2. The electronic device of claim 1, wherein, The electronic device further comprises a heat generating device, wherein the graphene film is arranged to face the heat generating device.

3. The electronic device of claim 1, wherein, The graphene film further comprises a third region, the third region has an electrical conductivity between the electrical conductivity of the graphene film of the first region and the electrical conductivity of the graphene film of the second region, and / or, The third region has a resistance value between the resistance value of the graphene film of the first region and the resistance value of the graphene film of the second region.

4. The electronic device of claim 1, wherein, The electronic device further comprises a feeding unit and a feeding element; One end of the feeding element is electrically connected to the feeding unit, and the other end of the feeding element directly feeds or couples feeds the first radiator.

5. The electronic device of claim 1, wherein, The antenna structure is at least one of: a monopole antenna, a dipole antenna, a Yagi antenna, a near field communication (NFC) antenna, a loop antenna, a log-periodic antenna, a T-shaped antenna, an inverted L-shaped antenna, an inverted F-shaped antenna, or a planar inverted F-shaped antenna.

6. The electronic device of claim 1, wherein, The electronic device further comprises a frame, and a second radiator of the antenna structure comprises a conductive part between a first position and a second position of the frame; The first radiator and the second radiator are arranged opposite to each other, and a projection of the first radiator on a first direction at least partially overlaps with a projection of the second radiator on the first direction, the first direction being perpendicular to a length direction of the second radiator.

7. The electronic device of claim 6, wherein, The electronic device further comprises a feeding unit; One end of the feeding unit is electrically connected to the second radiator to feed the antenna structure.

8. The electronic device of claim 1, wherein, The electronic device further comprises a printed circuit board (PCB), a display screen, and a back cover; The PCB is arranged in a space enclosed by the display screen and the back cover; At least a part of the graphene film is arranged between the PCB and the back cover.

9. The electronic device of claim 8, wherein, The electronic device further comprises a battery; The battery is arranged in the space enclosed by the display screen and the back cover; At least a part of the graphene film is arranged between the battery and the back cover.

10. The electronic device of claim 1, wherein, The graphene film comprises a plurality of first regions, and the plurality of first regions are arranged in an order.

11. The electronic device of any one of claims 1 to 10, wherein, The thickness of the graphene film of the first region is different from the thickness of the graphene film of the second region.

12. The electronic device of claim 2, wherein, The heat generating device is a chip.

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