Electronic devices

Abstract

This application relates to an electronic device. The electronic device includes a circuit board and an antenna assembly, with the antenna assembly disposed on one side of the circuit board. The antenna assembly includes a radiator and a feed point disposed on the radiator. The circuit board has a circuit area and a void area. The circuit area is used to arrange circuit traces and has a feed terminal electrically connected to the feed point, used to feed an excitation current to the radiator via the feed point. The excitation current forms a strong current region on the radiator. The void area is disposed opposite to the strong current region. The circuit area surrounds at least a portion of the outer edge of the void area; the void area is configured such that the current in the circuit area flows away from the void area. In the above-described electronic device, because the circuit board has a void area, the electric field distribution around the circuit board can be improved, causing the SAR hotspot of the antenna assembly to shift and disperse, thereby resulting in a lower SAR value for the antenna assembly.

Description

Technical Field

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

[0002] With the development and progress of science and technology, communication technology has achieved rapid development and great progress. With the improvement of communication technology, the popularity of smart electronic products has reached an unprecedented level. More and more smart terminals or electronic devices have become an indispensable part of people's lives, such as smart phones, smart bracelets, smart watches, smart TVs and computers. At present, communication antennas are usually set in electronic devices to meet the communication needs of users. With the increasing demand for communication efficiency and types, the power of antennas in electronic devices is also increasing, resulting in greater radiation effect of antennas on the human body, which will have an adverse effect on the human body. Summary of the invention

[0003] An embodiment of the present application provides an electronic device.

[0004] The electronic device provided in the embodiment of the present application includes a circuit board and an antenna device, wherein the antenna device is arranged on one side of the circuit board; the antenna device includes a radiator and a feeding point arranged on the radiator. The circuit board is provided with a circuit area and a vacant area, wherein the circuit area is used to arrange circuit wiring, and the circuit area is provided with a feeding end, which is electrically connected to the feeding point and is used to feed an excitation current to the radiator via the feeding point, wherein the excitation current forms a strong current area on the radiator, and the vacant area is arranged opposite to the strong current area. The circuit area surrounds at least part of the outer edge of the vacant area; the vacant area is configured to make the current of the circuit area flow to a side away from the vacant area.

[0005] In the electronic device provided by the embodiment of the present application, the antenna device includes a radiator and a feeding point arranged on the radiator, the feeding point is used to feed the excitation current into the radiator, and the excitation current forms a strong current area on the radiator. Since the circuit board is provided with a vacant area, the vacant area is opposite to the strong current area of ​​the radiator, so that the current on the circuit board is offset due to the existence of the vacant area, and the electric field of the current on the circuit board is prevented from being superimposed with the electric field of the current in the strong current area of ​​the radiator, and the electric field distribution around the circuit board can be improved, so that the SAR hotspot of the antenna device is dispersed, and the SAR value of the antenna device is lowered. In a specific application example, when the antenna device is applied to an electronic device, the vacant area can be arranged on a side of the circuit board that is usually close to the user (such as being arranged on the edge of the circuit board), so that the current on the radiator is biased toward the inner space of the physical part of the circuit board, and the current concentration point of the antenna device and the circuit board as a whole can be offset to a certain extent, and the electric field distribution of the antenna device and the circuit board as a whole is improved, and the SAR hotspot of the antenna device is offset accordingly, so that the SAR value of the antenna device can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solution of the application, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0007] Figure 1 It is a schematic diagram of an electronic device provided in an embodiment of the present application.

[0008] Figure 2 yes Figure 1 A schematic structural diagram of a circuit board and an antenna device of an electronic device is shown.

[0009] Figure 3 yes Figure 2 Schematic diagram of the structure of the circuit board and antenna device shown.

[0010] Figure 4 yes Figure 1 Another structural schematic diagram of a circuit board and an antenna device of an electronic device is shown.

[0011] Figure 5 yes Figure 2 Schematic diagram of simulation of the near-field electric field distribution of the circuit board and antenna device shown.

[0012] Figure 6 yes Figure 1 Another structural schematic diagram of a circuit board and an antenna device of an electronic device is shown.

[0013] Figure 7 yes Figure 1 Another structural schematic diagram of a circuit board and an antenna device of an electronic device is shown.

[0014] Figure 8 yes Figure 1 Schematic diagram of the internal structure of the electronic device shown.

[0015] Fig. 9 yes Figure 1 Schematic diagram of partial structural breakdown of the electronic device shown. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0017] As used in the embodiments of the present application, "electronic devices" include, but are not limited to, devices configured to receive / send communication signals via a wireline connection (e.g., via a public switched telephone network (PSTN), a digital subscriber line (DSL), a digital cable, a direct cable connection, and / or another data connection / network) and / or via a wireless interface (e.g., for a cellular network, a wireless local area network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter, and / or another communication terminal). A communication terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", "electronic device", and / or "electronic device". Examples of electronic devices include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notepads, calendars, and / or global positioning system (GPS) receivers; and conventional laptop and / or palmtop receivers, game consoles, or other electronic devices that include radiotelephone transceivers.

[0018] The specific absorption rate (SAR) is usually called the absorption rate or absorption ratio, which refers to the electromagnetic energy absorption rate of electronic equipment. The specific meaning is: under the action of the external electromagnetic field, an induced electromagnetic field will be generated in the human body. Since all organs of the human body are lossy media, the electromagnetic field in the body will generate induced currents, causing the human body to absorb and dissipate electromagnetic energy. SAR is often used in biodosimetry to characterize this physical process. The meaning of SAR is the electromagnetic power absorbed or consumed by unit mass of human tissue, in units of W / kg, or mw / g. The expression formula is: SAR = σ|Ei| 2 / 2ρ, where:

[0019] Ei is the effective value of the electric field intensity in the cell tissue, expressed in V / m;

[0020] σ is the conductivity of human tissue, expressed in S / m;

[0021] ρ is the human tissue density, in kg / m 3 express.

[0022] SAR in human tissue is proportional to the square of the electric field strength in the tissue, and is determined by the parameters of the incident electromagnetic field (such as frequency, strength, direction and source of the electromagnetic field), the relative position of the target, the genetic characteristics of typical tissues of the exposed human body, ground effects, and environmental effects of exposure. At present, many countries and regions have established safety standards for human exposure to electromagnetic waves. For example, among the internationally accepted standards, the European standard is less than 2.0w / kg per 10g, and the US standard is less than 1.6mw / g per gram.

[0023] Since the stronger the total radio power (TRP) of the antenna, the greater the SAR value caused by it, there is a mutually restrictive relationship between SAR and TRP. This mutually restrictive relationship has become a difficulty for current electronic devices to have low SAR values ​​while ensuring high transmission power requirements. Currently, the commonly used methods to reduce SAR values ​​are mainly the following: (1) directly reducing the transmission power of the antenna to reduce the absorption of electromagnetic waves by the human body, but it is difficult to ensure the TRP requirement by reducing the transmission power of the antenna. If the TRP is too low, the communication quality is also low, which usually cannot meet the increasingly high communication requirements in the market; (2) setting the position of the antenna in the electronic device away from the user's head to reduce the absorption of electromagnetic waves by the human body, but the current development trend of electronic devices is to make the thickness thinner and thinner, resulting in a smaller antenna space, making it difficult to ensure the distance between the antenna and the user's head; (3) attaching absorbing materials near the antenna to reduce the absorption of electromagnetic waves by the human body, but due to the structural design of the electronic device, the space near the antenna is extremely small, making it difficult to attach absorbing materials, and the cost of absorbing materials is also high. It can be seen that to date, there is still no good solution that can both reduce the SAR of the antenna and reliably ensure its TRP.

[0024] Therefore, in view of the above problems, the inventor of the present application has found after extensive and repeated research that the SAR value corresponding to the antenna of the current electronic device is relatively large, mainly because the excitation current will form a strong current area on the radiator, and the current on the mainboard of the electronic device will generate a current peak. The current peak on the mainboard and the current peak on the antenna radiator cause the SAR value corresponding to the antenna to be relatively large. In this regard, the inventor proposes the electronic device of the present application. The electronic device includes a circuit board and an antenna device, and the antenna device is arranged on one side of the circuit board; the antenna device includes a radiator and a feeding point arranged on the radiator. The circuit board is provided with a circuit area and a vacant area, the circuit area is used to arrange circuit wiring, the circuit area is provided with a feeding end, the feeding end is electrically connected to the feeding point, and is used to feed the excitation current to the radiator via the feeding point, the excitation current forms a strong current area on the radiator, and the vacant area is arranged opposite to the strong current area. The circuit area surrounds at least part of the outer edge of the vacant area; the vacant area is a vacant part on the circuit board, and the vacant area is configured to make the current of the circuit area flow to the side away from the vacant area.

[0025] In the above-mentioned electronic device, the antenna device includes a radiator and a feeding point arranged on the radiator, the feeding point is used to feed the excitation current into the radiator, and the excitation current forms a strong current area on the radiator. Since the circuit board is provided with a vacant area, the vacant area is opposite to the strong current area of ​​the radiator, so that the current on the circuit board is offset due to the existence of the vacant area, and the electric field of the current on the circuit board is prevented from being superimposed with the electric field of the current in the strong current area of ​​the radiator, and the electric field distribution around the circuit board can be improved, so that the SAR hotspot of the antenna device is dispersed, and the SAR value of the antenna device is lowered. In a specific application example, when the antenna device is applied to an electronic device, the vacant area can be arranged on a side of the circuit board that is usually close to the user (such as being arranged on the edge of the circuit board), so that the current on the radiator is biased toward the inner space of the physical part of the circuit board, and the current concentration point of the antenna device and the circuit board as a whole can be offset to a certain extent, and the electric field distribution of the antenna device and the circuit board as a whole is improved, and the SAR hotspot of the antenna device is offset accordingly, so that the SAR value of the antenna device can be reduced.

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0027] See also Figure 1 The embodiment of the present application provides an electronic device 400, which may be, but is not limited to, a mobile phone, a tablet computer, a smart watch, or other electronic devices. The electronic device 400 of this embodiment is described by taking a mobile phone as an example.

[0028] The electronic device 400 includes a circuit board 200 and an antenna device 100, and the antenna device 100 is arranged on one side of the circuit board 200. The antenna device 100 includes an antenna body 10 and a feed source 30 connected to the antenna body 10. The antenna body 10 is used to receive and transmit signals, and the feed source 30 is used to feed a current signal to the antenna body 10 so that the antenna body 10 can resonate to transmit signals. The feed source 30 is connected to the circuit board 200 and can be controlled by the circuit board 200.

[0029] Furthermore, the electronic device 400 may also include a housing 1001 and a display screen 1003 disposed on the housing 1001, and the antenna device 100 may be integrated on the housing 1001, so that the spatial layout of the electronic device 400 is relatively compact. In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only simplified for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the present application.

[0030] See also Figure 2In this embodiment, the antenna body 10 includes a radiator 12 and a feeding point 14. The feeding point 14 is used to feed the excitation current into the radiator 12, and the excitation current forms a strong current area on the radiator. In this specification, "strong current area" can be understood as a region in which the current density is greater than the current density around it. For example, when the antenna body 10 transmits a signal, the current enters the radiator 12 from the feed source 30 via the feeding point 14, and a strong current area is formed near the feeding point 14. The strong current area includes a point with a strong current (a point with a large current density), so there will be a SAR hotspot at the feeding point 14 of the radiator 12. In some embodiments, the antenna body may also include a grounding point 16 arranged on the radiator 12. When the antenna body 10 receives a signal, the radiator 12 converts the electromagnetic wave signal into a current, and the current flows back through the grounding point 16. A strong current area is also formed near the grounding point 16 of the radiator 12, so there will also be a SAR hotspot at the grounding point 16. The presence of these SAR hot spots, especially when the SAR hot spots are located close to the user, may adversely affect the body of the user using the antenna device.

[0031] In order to offset the SAR hotspot of the radiator 12 to weaken its adverse effect on the user, the circuit board 200 of the embodiment of the present application is provided with a vacant area 22, which is a portion of the circuit board 200 where the material is removed, so that a gap or a through hole is formed on the circuit board 200, so as to improve the electric field distribution of the circuit board 200. The vacant area 22 is arranged relative to the strong current area on the radiator 12, so that the current of the circuit board 200 can meet the strong current area of ​​the radiator 12, thereby offsetting the SAR hotspot of the antenna device 100. In a specific application example, when the antenna device 100 is applied to the electronic device 400, the vacant area 22 can be arranged on the side of the circuit board 200 that is usually closer to the user (such as at the edge of the circuit board 200), so that the current on the circuit board 200 is biased toward the physical part of the circuit board 200, and the current concentration point of the circuit board 200 can be offset to a certain extent, thereby changing the electric field distribution around the antenna device 100, and the SAR hotspot of the antenna device 100 is offset and dispersed accordingly, so that the SAR value of the antenna device 100 can be reduced. Furthermore, in some embodiments of the present application, the vacant area 22 can be set adjacent to the grounding point 16 (for example, at least a portion of the vacant area 22 is set opposite to the grounding point 16); in other embodiments, the vacant area 22 can also be set adjacent to the feeding point 14 (for example, at least a portion of the vacant area 22 is set opposite to the feeding point 14).

[0032] In some embodiments, the circuit board 200 is provided with a circuit area 24, and the circuit area 24 surrounds at least a portion of the outer edge of the vacant area 22, so that the vacant area 22 can be configured so that the current of the circuit area 24 flows to a side away from the vacant area 22. The circuit area 24 is used to arrange circuit wiring, and the circuit area 24 is provided with a feeding terminal (not marked in the figure) and a grounding terminal (not marked in the figure), the feeding terminal is electrically connected to the feeding point 14, and the grounding terminal is electrically connected to the grounding point 16.

[0033] In the embodiment of the present application, the structure and shape of the vacant area 22 are not limited, and it can be a through hole structure of any shape or a notch structure of any shape opened on the circuit board 200. The vacant area 22 can be defined by the physical boundary of the circuit board 200, or by the physical boundary of the circuit board 200 and a reasonable extension line of the physical boundary.

[0034] See also Figure 3 In some embodiments, the circuit board 200 is substantially rectangular, and may be a PCB circuit board of 100 mm*50 mm*1 mm. The circuit board 200 may include a first side 223, a second side 225, a third side 227, and a fourth side 229. The first side 223 and the second side 225 are arranged opposite to each other, and the third side 227 and the fourth side 229 are arranged opposite to each other. The third side 227 and the fourth side 229 are both connected between the first side 223 and the second side 225, and the first side 223, the second side 225, the third side 227, and the fourth side 229 together form the physical outline of the circuit board 200. The radiator 12 is arranged on one side of the second side 225, and is spaced apart from the second side 225 to ensure that the radiator 12 has sufficient clearance area. In this embodiment, the vacant area 22 is defined by the second side 225, and the vacant area 22 is arranged on one side of the second side 225 of the radiator 22, so that the current strong point near the second side 225 is shifted toward the circuit area 24, thereby changing the electric field distribution around the circuit board 200, so that the SAR hotspot of the antenna device 100 is shifted and dispersed, thereby reducing the SAR value of the antenna device 100.

[0035] exist Figure 3 In the illustrated embodiment, the vacant area 22 is a notch structure opened on the radiator 12, which is a substantially rectangular notch. The notch passes through the side of the circuit board 200 facing the radiator 12. In this embodiment, at least a portion of the vacant area 22 is opposite to the feeding point 14, so that there is a certain distance between the current on the circuit board 200 and the feeding point 14, which is conducive to dispersing the current strong point near the feeding point 14, thereby effectively reducing the SAR value of the antenna device 100.

[0036] For further information, see Figure 4In some embodiments, at least part of the vacant area 22 may also be opposite to the grounding point 16, so that there is a certain distance between the current on the circuit board 200 and the grounding point 16, which is conducive to dispersing the strong current points near the grounding point 14, thereby further reducing the SAR value of the antenna device 100. When the outline of the vacant area 22 is projected onto the radiator 12, the outline of the vacant area 22 can be projected to cover the feeding point 14 and the grounding point 16. Furthermore, the vacant area 22 may also be opposite to the radiating end of the radiator 12, and when the outline of the vacant area 22 is projected onto the radiator 12, the outline of the vacant area 22 can be projected to cover the radiating end of the radiator 12.

[0037] In some embodiments, in the extension direction of the radiation end of the radiator (eg Figure 4 In the Y direction of the radiator, the size of the vacant area 22 (which can be understood as the length of the vacant area 22) can be set to be greater than or equal to 10mm and less than or equal to 30mm, and can be specifically set to 10mm, 12mm, 14mm, 15mm, 18mm, 20mm, 22mm, 24mm, 25mm, 28mm, 30mm, etc. In the direction perpendicular to the extension direction of the radiation end of the radiator (such as Figure 4 In the X direction in the figure, the size of the vacant area 22 (which can be understood as the width of the vacant area 22) can be set to be greater than or equal to 1mm and less than or equal to 3mm, and can be specifically set to 1.0mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.5mm, 2.8mm, 3.0mm, etc. By limiting the length and width of the vacant area 22, the area of ​​the hollowed-out part on the circuit board 200 can be limited to meet the preset requirements, thereby preventing the circuit board 200 from being hollowed out too much to affect its structural stability, and also preventing the hollowed-out area from being too small to have a small effect on the deviation of the current strong point. Therefore, by limiting the length and width of the vacant area 22, the SAR hotspot of the antenna device 100 can be offset while ensuring the structural strength and loading area of ​​the circuit board 200. When the antenna device 100 is applied to a specific electronic device, the antenna device 100 can be set so that the offset SAR hotspot is farther away from the user, thereby reducing the adverse effects of the antenna device 100 on the human body. It should be noted that in this specification, the "length" in the terms "length dimension", "length", "length direction", etc. is based on the radiator 12, and should be understood as the direction in which the radiating end of the radiator 12 extends (for example, the direction from the feeding point 14 to the radiating end, which can also be referred to as the extension direction of the radiating end of the radiator 12), and the "width" in the terms "width dimension", "width", "width direction", etc. should be understood as a direction roughly perpendicular to the length.

[0038] In some embodiments, in order to better adjust the impedance of each band of the antenna device 100, the antenna device 100 may further include a matching circuit module 50, which is connected between the feed source 30 and the feed point 14. The matching circuit module 50 is used to assist in the tuning of the antenna body 10. By adjusting the impedance of each band through the matching circuit module 50, the band can have a better matching output, and the resonant frequency of the antenna device 100 can be prevented from shifting, thereby ensuring that the antenna device 100 has a higher radiation performance. The matching circuit 30 may specifically include a PI-type matching circuit or a T-type matching circuit.

[0039] In the electronic device 400 provided in the above embodiment of the present application, since the circuit board 200 is provided with a vacant area 22, the vacant area 22 is a portion of the circuit board 200 where the material is removed, so that a gap or a through hole is formed on the circuit board 200, so as to improve the electric field distribution around the circuit board 200 and thus shift the SAR hotspot of the antenna device 100. In a specific application example, when the antenna device 100 is applied to an electronic device, the vacant area 22 can be set on the side of the circuit board 200 that is usually close to the user (such as being set on the edge of the circuit board 200), so that the current on the radiator 12 is biased toward the inner space of the solid part of the circuit board 200, and the current concentration point of the antenna device 100 and the circuit board 200 as a whole can be shifted to a certain extent, thereby improving the electric field distribution of the antenna device 100 and the circuit board 200 as a whole, and the SAR hotspot of the antenna device 100 is shifted and dispersed accordingly, thereby being able to reduce the SAR value of the antenna device 100.

[0040] For details, please refer to Figure 5 , Figure 5 The schematic diagram of the simulation of the near-field electric field distribution of the conventional antenna and the antenna device 100 and the circuit board 200 provided in some embodiments of the present application is shown, which shows the electric field strength radiated when the resonant frequency of the antenna device 100 is 0.97 GHZ and the corresponding SAR peak value, wherein the dotted line range A and the dotted line range B show the area with strong electric field strength, and in the dotted line range A and the dotted line range B, the darker the color, the stronger the electric field strength, and the lighter the color, the stronger the electric field strength. Figure 5 Figure (a) shows that in traditional electronic devices, there is no vacant area on the circuit board. At this time, in the dotted line range A, the electric field intensity extreme value and the electric field distribution range are significantly larger, and the corresponding SAR value peak is 2.4525W / kg; Figure 5Figure (b) shows that in the electronic device provided by the present application, the circuit board 20 is provided with a vacant area 22. At this time, in the dotted line range B, the electric field intensity extreme value and the electric field distribution range are relatively small, and the corresponding SAR value peak is 1.87623W / kg. Compared with the antenna structure of the ordinary radiator, the SAR value peak is reduced by about 23%. It can be seen that the antenna device 100 provided by the embodiment of the present application has a lower SAR value.

[0041] Since the electronic device 400 provided in the embodiment of the present application utilizes the improved structure of the circuit board 200 to make the antenna device 100 have a lower SAR value, it is not necessary to change the structure of the antenna device 100. Compared with the antenna device of the traditional electronic device, the antenna efficiency of the antenna device 100 provided in the embodiment of the present application does not change significantly (or even does not change, and its antenna efficiency is maintained). Therefore, by providing a vacant area 22 on the circuit board 200, the electronic device 400 can make the common current strong point of the circuit board 200 and the antenna device 100 shift and disperse in the desired direction, improve the electric field distribution around the antenna device 100, make the maximum radiation intensity of the electric field relatively low, and the average value of the overall radiation is not reduced, and the antenna device 100 still has a high radiation efficiency.

[0042] In the embodiment of the present application, the shape of the vacant area 22 is not limited to the shape provided in the above embodiment.

[0043] See also Figure 6 In some embodiments, the vacant area 22 is roughly in the shape of a triangular notch and passes through the side of the circuit board 200 facing the radiator 12. When the outline of the vacant area 22 is projected onto the radiator 12, the outline projection of the vacant area 22 at least covers the feeding point 14, so as to facilitate the current strong point at the feeding point 14 to be shifted to the desired direction. In other embodiments, the vacant area 22 can be a notch of other shapes, such as a circle, a strip, an irregular shape, etc., which will not be described in detail in this specification.

[0044] In some embodiments, the vacant area 22 may also be in the shape of a through hole. Specifically, the vacant area 22 may be a through hole opened in the circuit board 200, the through hole passing through two opposite surfaces of the circuit board 200, and located on the side of the circuit board 200 close to the radiator. The through hole may be arranged adjacent to at least one of the feeding point 14 and the grounding point 16, and the shape of the through hole may be a triangle, rectangle, circle, ellipse, polygonal hole or other irregular hole, etc., which are not described in detail in this specification. By making the vacant area 22 into a through hole structure, the circuit board 200 can be divided into at least two parts, so that the current of the circuit board 200 can be shunted, the electric field distribution around the circuit board 200 is changed, and the SAR hotspot of the antenna device 100 can be offset, so that the overall SAR value of the antenna device 100 is weaker.

[0045] In some embodiments, when the vacant area 22 is a through hole opened in the circuit board 200, the circuit board 200 has a solid structure at the portion of the through hole close to the radiator 12. Metal traces do not need to be arranged on these solid structures to ensure that the antenna device 100 has sufficient clearance area and the structural strength of the circuit board 200 is relatively large. Further, when the vacant area 22 is a through hole opened in the circuit board 200, the circuit area 24 can be arranged on the side of the vacant area 22 away from the radiator 12, rather than between the vacant area 22 and the radiator 12.

[0046] In some embodiments, the number of the vacant areas 22 on the circuit board 200 may be one or more, so as to facilitate the dispersion of the current of the circuit board 200 and the current strong point on the radiator 12, and effectively change the electric field distribution around the circuit board 200. For example, there may be two vacant areas 22 on the circuit board 200, and the two vacant areas 22 are arranged at intervals from each other, one of the vacant areas 22 is opposite to the feeding point 14, and the other vacant area 22 may be opposite to the grounding point 16, or opposite to the radiation end of the radiator 12. For another example, there may be three vacant areas 22 on the circuit board 200, and the three vacant areas 22 are arranged at intervals in sequence and are opposite to the feeding point 14, the grounding point 16, and the radiation end of the radiator 12, respectively.

[0047] The above-mentioned electronic device provided in the embodiment of the present application has a circuit board with a vacant area, and the vacant area is arranged adjacent to the radiator, which can offset the current on the circuit board close to the radiator, improve the electric field distribution around the antenna device, make the maximum radiation intensity of the electric field relatively low, and the antenna device can have a higher radiation efficiency.

[0048] See also Figure 7 In some embodiments, the electronic device 400 may further include a coupling metal sheet 70, which is disposed in the vacant area 22 and spaced from the radiator 12. There is no electrical connection between the metal coupling sheet 12 and the circuit area 24, and between the metal coupling sheet 12 and the radiator 12. Furthermore, the coupling metal sheet 70 is opposite to at least part or all of the structure on the radiator 12 from the feeding point 14 to the radiation end, and a predetermined gap is provided between the coupling metal sheet 70 and the radiator 12, so that the coupling metal sheet 12 can be configured to couple with the radiator 12. The width of the gap between the coupling metal sheet 70 and the radiator 12 is less than one quarter of the wavelength of the center frequency of the working frequency band of the antenna device 100. The coupling metal sheet 70 can be used to receive the signal of the radiator 12 and radiate the signal for the second time, that is, to radiate the received signal again, thereby sharing the radiation hotspot of the radiator 12, and the concentration of the radiation of the radiator 12 will be reduced, thereby reducing the overall SAR value of the antenna device 100. The shape of the coupling metal sheet 70 is not limited, and it may be a rectangular strip, or may be an irregular shape, such as a long strip with irregular cutouts, grooves, or protrusions.

[0049] In some embodiments, the electronic device 400 may further include a functional module 80, which may be disposed in the vacant area 22 to reasonably utilize the space in the vacant area 22, so that the internal space of the electronic device 400 is relatively compact. Further, in order to prevent the functional module 80 from affecting the signal transmission of the antenna device 100, the electronic device 400 may further include an inductor 90, which is connected between the functional module 80 and the circuit board 200. The inductor 90 is connected in series with the functional module 80, and is used to weaken the mutual interference between the functional module 80 and the antenna device 100. At the same time, tuning using the inductor 90 and the matching circuit module 50 can also weaken the mutual interference between the functional module 80 and the antenna device 100. In a specific embodiment, the functional module 80 may include a weaker electromagnetic radiation element such as a microphone and a sensor.

[0050] See also Figure 8 In some embodiments, the housing 1001 includes a rear housing 1010 ( Figure 1 ) and a middle frame 1011, and the rear shell 1010 and the display screen 1003 are respectively arranged on opposite sides of the middle frame 1011.

[0051] The middle frame 1011 can be an integrally formed structure, which can be structurally divided into a bearing portion 1012 and a frame 1013 surrounding the bearing portion 1012. It should be understood that the "bearing portion" and "frame" are only named for the convenience of expression. The structure filled with oblique lines in the figure is only for distinction and identification, and does not represent the actual structure of the two. There may be no obvious dividing line between the two, or they may be two or more parts assembled together. The naming of "bearing portion" and "frame" should not limit the structure of the middle frame 1011. The bearing portion 1012 is used to carry a part of the structure of the display screen 1003, and can also be used to carry or install electronic components of the electronic device 200 such as the circuit board 200, the battery 1006, the sensor module 1007, etc. The frame 1013 is connected to the periphery of the bearing portion 1012. Further, the frame 1013 is arranged around the periphery of the bearing portion 1012, and protrudes relative to the surface of the bearing portion 1012, so that the two together form a space for accommodating electronic components. In this embodiment, the display screen 1013 is covered on the frame 1013, and the frame 1013, the rear shell 1010 and the display screen 1003 together form the appearance surface of the electronic device 400. The antenna device 100 is integrated in the shell 1001, for example, the antenna device 100 can be set in the middle frame 1011, and can also be set in the rear shell 1010, which is not limited in this specification.

[0052] Further, in Figure 8In the illustrated embodiment, the frame 1013 is made of metal, and the antenna device 100 is integrated in the frame 1013. In this embodiment, the frame 1013 may be provided with a gap 1014, the gap 1014 is connected to the outside and divides the frame 1013 into two parts, and the antenna device 100 is integrated in one part of the frame 1013. Specifically, the grounding point 16 and the feeding point 14 are both arranged in the frame, and the feeding point 14 is arranged between the gap 1014 and the grounding point 16, so that the metal frame can be configured as a radiator 12 to transmit or receive signals, wherein the radiation end of the radiator 12 is located on one side of the gap 1014. In this way, using the metal frame 1013 as a part of the radiator of the antenna device 100 is conducive to saving space in the electronic device 400, and also provides a larger clearance area for the antenna device 100, which is conducive to ensuring a higher radiation efficiency. Furthermore, in this embodiment, the vacant area 22 is disposed on a side of the circuit board 200 close to the frame 1013 , and when the outline of the vacant area 22 is projected onto the frame 1013 , the outline of the vacant area 22 covers the gap 1014 and at least part of the structure of the radiator 12 .

[0053] In this embodiment, a gap is provided between the portion of the frame 1013 that serves as the radiator 12 and the carrier 1013, and the gap is connected to the slit 1014, so that the radiator 12 and the carrier 1012 are spaced apart from each other to prevent the carrier 1012 from affecting the resonance of the radiator 12. Further, a non-shielding body (not shown in the figure) may be provided in the slit 1014, and the non-shielding body is made of non-metal (such as resin, etc.), and has the property of passing electromagnetic wave signals to allow the antenna device 100 to transmit signals. The outer surface of the non-shielding body is flush with the outer surface of the frame 1013 to ensure the integrity of the appearance of the electronic device 400.

[0054] Furthermore, in this embodiment, the circuit area 24 of the circuit board 200 is spaced apart from the frame 1013 so that the circuit area 24 can be spaced apart from the radiator 12, so that the current strong point on the circuit board 200 is relatively far away from the current strong point on the radiator 12, which is beneficial to reducing the SAR value of the antenna device 100.

[0055] In this embodiment, the circuit board 200 is disposed on the bearing portion 1012, and there is a certain distance between the edge of the circuit board 200 and the radiator 12, so as to ensure that the antenna device 100 has a large clearance area, and the current concentration point on the circuit board 200 and the current concentration point on the antenna device 100 are dispersed as much as possible, which can also reduce the SAR value of the antenna device 100 to a certain extent. In this embodiment, the distance between the circuit board 200 and the radiator 12 can be 1-5mm, for example, the distance between the circuit board 200 and the radiator can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0056] In some other embodiments, the frame 1013 may be made of non-metal, and the antenna device 10 may be integrated into the frame 1013. For example, the frame 1013 may be made of materials such as plastic and resin, and the radiator 12 of the antenna device 10 may be integrated into the frame 1013 by insert molding (e.g., the radiator 12 is embedded in the frame 1013 as a whole), or may be integrated into the frame 1013 by attachment (e.g., the radiator 12 is attached to the surface of the frame 1013). Fig. 9 In this embodiment, the radiator 12 of the antenna device 100 is substantially sheet-shaped, which is disposed on the frame 1013 and is substantially perpendicular to the plane where the circuit board 100 is located. The vacant area 22 is disposed on the side of the circuit board 200 close to the frame 1013, so that the current on the circuit board 200 can be offset to a direction relatively far away from the frame 1013, that is, the SAR hotspot of the antenna device 100 is dispersed to a direction relatively far away from the frame 1013, which can further reduce the radiation effect of the antenna device 100 on the user.

[0057] In the electronic device provided in the above embodiment of the present application, the antenna device includes a radiator and a feeding point arranged on the radiator, the feeding point is used to feed the excitation current into the radiator, and the excitation current forms a strong current area on the radiator. Since the circuit board is provided with a vacant area, the vacant area is opposite to the strong current area of ​​the radiator, so that the current on the circuit board is offset due to the existence of the vacant area, and the electric field of the current on the circuit board is prevented from being superimposed with the electric field of the current in the strong current area of ​​the radiator, and the electric field distribution around the circuit board can be improved, so that the SAR hotspot of the antenna device is dispersed, and the SAR value of the antenna device is lowered. In a specific application example, when the antenna device is applied to an electronic device, the vacant area can be arranged on the side of the radiator that is usually facing the user, so that the current on the radiator is biased toward the solid part of the radiator, and the current concentration point of the antenna device can be offset to a certain extent, and the electric field distribution of the antenna device is improved. The SAR hotspot of the antenna device is offset and dispersed accordingly, so that the SAR value of the antenna device can be reduced.

[0058] It should be noted that, in the present application specification, when a component is considered to be "disposed on" another component, it may be connected to or directly disposed on another component, or there may be an intermediate component at the same time (that is, the two are indirectly connected); when a component is considered to be "connected to" another component, it may be directly connected to another component or there may be an intermediate component at the same time, that is, the two components may be indirectly connected.

[0059] In this specification, the specific features or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they contradict each other. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electronic device, characterized in that: The invention comprises a circuit board and an antenna device, wherein the antenna device is arranged on one side of the circuit board; the antenna device comprises a radiator and a feeding point, wherein the radiator is used to radiate a signal, the radiator is spaced from the circuit board, and the feeding point is arranged on one side of the radiator close to the circuit board; The circuit board is provided with a circuit area and a vacant area, the circuit area is used for arranging circuit routing, the circuit area is provided with a feeding end, the feeding end is electrically connected to the feeding point, and is used to feed the excitation current to the radiator via the feeding point, the excitation current forms a strong current area at the feeding point on the radiator, the vacant area is a gap located on the side of the circuit board close to the grounding portion of the radiator, the gap passes through the side of the circuit board facing the radiator; the vacant area is arranged opposite to the strong current area, and at least part of the vacant area is opposite to the feeding point; the circuit area surrounds at least part of the outer edge of the vacant area; the vacant area is configured to make the current of the circuit area flow to the side away from the vacant area.

2. The electronic device according to claim 1, wherein: The electronic device further includes a frame, the antenna device is integrated in the frame, and the circuit area of ​​the circuit board is spaced apart from the frame so that the circuit area is spaced apart from the radiator.

3. The electronic device according to claim 2, characterized in that: The radiator is in a sheet shape and is arranged on the frame and is perpendicular to the plane where the circuit board is located.

4. The electronic device according to claim 2, characterized in that: The vacant area is provided with a coupling metal sheet, a predetermined gap is provided between the coupling metal sheet and the radiator, and there is no electrical connection relationship between the coupling metal sheet and the circuit area or between the coupling metal sheet and the radiator; the coupling metal sheet is configured to couple with the radiator.

5. The electronic device according to claim 4, characterized in that: The coupling metal sheet is opposite to the portion of the radiator from the feeding point to the radiation end, and the gap width between the coupling metal sheet and the radiator is less than a quarter of the wavelength of the center frequency of the working frequency band of the antenna device.

6. The electronic device according to claim 1, wherein: The electronic device further comprises a functional module and an inductor. The functional module is arranged in the vacant area. The inductor is electrically connected to the circuit area and is connected in series with the functional module.

7. The electronic device according to claim 6, characterized in that: The functional module includes a microphone.

8. The electronic device according to claim 1, wherein: The electronic device further comprises a shell, which comprises a bearing portion and a frame connected to the bearing portion, wherein the frame is provided with a gap communicating with the outside; the radiator is integrated on the frame and is located on one side of the gap.

9. The electronic device according to claim 8, characterized in that: The frame is at least partially made of metal; the feeding point is arranged on the frame, so that the metal frame is configured as a radiator to transmit or receive signals; when the outline of the vacant area is projected onto the frame, the outline of the vacant area covers the gap and at least part of the structure of the radiator.

10. The electronic device according to claim 9, characterized in that: The antenna device also includes a grounding point arranged on the radiator, and at least a portion of the vacant area is opposite to the grounding point. When the outline of the vacant area is projected onto the radiator, the outline projection of the vacant area covers the feeding point and the grounding point.

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