Electronic device

Abstract

The embodiment of the invention relates to electronic equipment, which comprises a main board, a first connecting seat and a second connecting seat, the small plate is provided with a second connecting seat; the first radiator is used for radiating a radio frequency signal of a first frequency band; the two ends of the radio-frequency signal line are connected with the first connecting base and the second connecting base respectively, the radio-frequency signal line is coupled with the adjacent conductive piece to generate parasitic current, and the radio-frequency signal line is used for radiating a radio-frequency signal of a second frequency band under the action of the parasitic current; wherein the second frequency band and the first frequency band are staggered.

Description

Technical Field

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

[0002] As the functions of electronic devices continue to expand, the arrangement of components in electronic devices has become more and more compact. Among them, some structures with conductive properties will generate clutter interference through coupling and affect the radiation performance of antenna radiators in electronic devices, thereby affecting the communication quality of electronic devices. Summary of the invention

[0003] Based on this, it is necessary to provide an electronic device that can reduce clutter interference in response to the above technical problems.

[0004] An electronic device, comprising:

[0005] A mainboard, wherein the mainboard is provided with a first connecting socket;

[0006] A small plate, wherein the small plate is provided with a second connecting seat;

[0007] A first radiator, used for radiating a radio frequency signal in a first frequency band;

[0008] A radio frequency signal line, wherein two ends of the radio frequency signal line are respectively connected to the first connection socket and the second connection socket, the radio frequency signal line is coupled with an adjacent conductive member to generate a parasitic current, and the radio frequency signal line is used to radiate a radio frequency signal of a second frequency band under the action of the parasitic current;

[0009] The second frequency band is staggered with the first frequency band.

[0010] In one embodiment, the second connection base includes a ground output terminal for outputting a ground signal, and the small board further includes:

[0011] A matching circuit is connected between the ground output end of the second connection socket and the ground plane of the small board, and the matching circuit is used to adjust the frequency band of the radiation signal of the radio frequency signal line to be staggered with the first frequency band.

[0012] In one embodiment, the small board is provided with a first conductive layer and a second conductive layer separated from each other, the ground output end of the second connection socket is connected to the first conductive layer, and the second conductive layer serves as the ground plane;

[0013] The first conductive layer is provided with a first pad, the second conductive layer is provided with a second pad, and the matching circuit is connected to the first pad and the second pad respectively.

[0014] In one of the embodiments, the first conductive layer is provided with a plurality of the first pads;

[0015] The second conductive layer is provided with a plurality of second pads, and the plurality of first pads are respectively provided corresponding to the plurality of second pads.

[0016] In one embodiment, the matching circuit includes a capacitor, and a capacitance value of the capacitor is determined according to the electrical length of the radio frequency signal line and the first frequency band.

[0017] In one embodiment, the first frequency band is a low frequency band, and the second frequency band is 1 GHz to 6 GHz.

[0018] In one embodiment, the matching circuit includes an inductor, and the inductance value of the inductor is determined according to the electrical length of the radio frequency signal line and the first frequency band.

[0019] In one embodiment, the RF signal line is used to radiate RF signals of the second frequency band in a half-wavelength loop antenna mode, and the electrical length of the RF signal line is greater than twice the wavelength of the first frequency band.

[0020] In one embodiment, the first frequency band is a low frequency band, and the second frequency band is lower than 0.8 GHz.

[0021] In one embodiment, the radio frequency signal line comprises a coaxial connecting line, and the coaxial connecting line comprises an inner conductor layer and an outer conductor layer;

[0022] The inner conductor layer of the coaxial connecting wire is used to transmit the radio frequency signal, and the outer conductor layer of the coaxial connecting wire is used to transmit the ground signal. The above-mentioned electronic device, by providing a first connecting socket, a second connecting socket, and a radio frequency signal line for connecting the first connecting socket and the second connecting socket, can transmit the excitation signal provided by the feed source on the main board from the main board to the small board, so that the excitation signal can be fed into the first radiator, so that the first radiator can radiate the radio frequency signal of the first frequency band under the action of the excitation signal. The radio frequency signal line can also transmit the ground signal from the main board to the small board, so that the first radiator can return to the ground nearby, thereby shortening the total length of the wiring in the electronic device. Moreover, for the parasitic current generated by coupling on the radio frequency signal line, this embodiment can improve the problem of clutter interference of the electronic device in the first frequency band by controlling the radiation frequency band of the radio frequency signal line to the second frequency band, so that it is staggered with the first frequency band corresponding to the first radiator, thereby improving the radiation performance in the first frequency band and improving the communication quality of the electronic device. In addition, the technical solution of this embodiment can reduce the clutter interference of the RF signal line with a relatively simple structure without the need for complex structures such as wire clamps and grounding rings, thereby simplifying the design of the antenna module and reducing the space occupied by the battery compartment, so that the electronic device can be equipped with a larger capacity battery to extend the battery life of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is one of the structural schematic diagrams of an electronic device according to an embodiment;

[0025] Figure 2 A partial schematic diagram of a small plate of an embodiment;

[0026] Figure 3 This is a simulation diagram of the current on the RF signal line when no matching circuit is set;

[0027] Figure 4 A schematic diagram of the current on the RF signal line when no matching circuit is provided;

[0028] Figure 5 A schematic diagram of current on a radio frequency signal line when a matching circuit including a capacitor is provided in an embodiment;

[0029] Figure 6 A comparison diagram of radiation efficiency of an electronic device under different capacitor connection conditions according to an embodiment;

[0030] Figure 7 A comparison diagram of radiation efficiency and total efficiency of an electronic device under different capacitor connection conditions according to an embodiment;

[0031] Figure 8 A schematic diagram of current on a radio frequency signal line when a matching circuit including an inductor is provided in an embodiment;

[0032] Fig. 9 A comparison diagram of the radiation efficiency of an electronic device under different inductor connection conditions according to an embodiment;

[0033] Fig.10 A comparison diagram of radiation efficiency and total efficiency of an electronic device in one embodiment under different inductor connection conditions;

[0034] Fig.11 This is a second structural schematic diagram of an electronic device according to an embodiment;

[0035] Fig.12 The figure is a diagram showing the internal structure of an electronic device according to an embodiment. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first client may be referred to as a second client, and similarly, a second client may be referred to as a first client without departing from the scope of this application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined. "Several" means at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0039] The embodiment of the present application provides an electronic device, which may be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices may be smart speakers, smart TVs, smart air conditioners, smart car devices, etc. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, etc.

[0040] The electronic device includes an antenna assembly for communication. In addition, the electronic device also includes a middle frame, a display screen and a shell. The middle frame includes a frame body and a frame, and the frame is arranged around the periphery of the frame body. The display screen and the shell are respectively arranged on opposite sides of the frame body of the middle frame. It can be understood that the introduction of the electronic device is only an introduction to an application environment of the antenna assembly, and other components other than the antenna assembly in the electronic device should not be understood as a limitation of the antenna assembly provided in the embodiment of the present application.

[0041] When the radiator in the antenna assembly radiates the radio frequency signal, it is often interfered by the clutter generated by other conductive structures in the electronic device. There are two main types of clutter interference. One is the antenna resonance frequency deviation caused by the environment, and the other is the deterioration of the in-band performance caused by the parasitic unit, that is, other metal structures in the electronic device will form a parasitic antenna, thereby affecting the radiation ability of the radiator. In response to the second type of clutter interference, in the relevant technology, filter circuits, defective grounds, isolation branches, orthogonal polarization and other methods are usually used to reduce clutter interference. For example, the signal in the frequency band where the clutter is located can be filtered out by a filter circuit, and the signal in the required frequency band can be retained to reduce clutter interference. For another example, the RF signal line that generates interference can be grounded by a grounding ring and a wire clamp to change the resonance mode of the RF signal line, thereby reducing clutter interference. However, the wire clamp needs to be installed manually, and the assembly steps are more complicated, while increasing the labor cost and production cost of the mobile phone.

[0042] Figure 1 FIG. 1 is a schematic diagram of a structure of an electronic device according to an embodiment of the present invention. Figure 1 The present application provides an electronic device, including a main board, a small board, a first radiator and a radio frequency signal line. Figure 1 Not shown, the first radiator may be any one of the multiple radiators shown.

[0043] The mainboard is arranged in the housing and near the top of the electronic device. The mainboard can be used to set various circuits and functional modules of the electronic device, such as setting a processor, a memory, a baseband chip, etc. The feed source for supporting the communication function is arranged on the mainboard. The small board is arranged in the housing and near the bottom. The small board can be understood as a smaller circuit board independent of the mainboard, and the small board can also be used to set circuits and functional modules.

[0044] The main board is provided with a first connection socket, the small board is provided with a second connection socket, and the electronic device also includes a radio frequency signal line. The two ends of the radio frequency signal line are respectively connected to the first connection socket and the second connection socket, and the radio frequency signal line is used to transmit a ground signal and an excitation signal. The radio frequency signal line can transmit the ground signal from the ground end of the main board to the ground end of the small board, so that the radiator located at the bottom of the electronic device can return to the ground nearby. The excitation signal transmitted by the radio frequency signal line can be any one of a low frequency signal, an intermediate frequency signal, a high frequency signal and an ultra-high frequency signal, which is not limited here. For example Figure 1 As shown, the electronic device may include at least two RF signal lines, which are used to transmit a low-frequency excitation signal and a medium-high frequency excitation signal respectively. A signal transmission circuit is provided on the small board, the signal transmission circuit is electrically connected to the feeding point of the radiator, and can be connected to the second connection socket, so that the excitation signal output by the feed source can be fed into the feeding point of the radiator through the first connection socket, the RF signal line, the second connection socket, and the signal transmission circuit in sequence.

[0045] The first radiator is used to receive an excitation signal from a feed source, and to generate an excitation current under the excitation of the excitation signal, thereby radiating a radio frequency signal in the first frequency band. The first radiator may also be referred to as an excited antenna radiator, an excitation radiator or a main branch. The first radiator may be any one of a laser direct structuring (LDS) radiator, a flexible printed circuit (FPC) radiator, a print direct structuring (PDS) radiator and a metal branch radiator. When the antenna assembly is applied to an electronic device, the first radiator may be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device itself. For example, the first radiator may be an antenna radiator designed using a middle frame formed of plastic and metal of the electronic device. In addition, the first radiator may also be a metal frame radiator designed using a metal middle frame.

[0046] It is understandable that the present application does not make any specific limitation on the shape, structure and material of the first radiator, and the shapes of the first radiator include but are not limited to bent, straight, L-shaped, sheet-shaped, rod-shaped, coated, thin film, etc. When the first radiator is in a strip shape, the present application does not limit the extension trajectory of the first radiator, so the first radiator can extend in a straight line, a curve, a multi-stage bend, etc. The above-mentioned first radiator can be a line with uniform width on the extension trajectory, or it can be an irregular shape with different widths such as a gradient width and a widened area. In the schematic diagram of this embodiment, the first radiator extends along a straight line trajectory. It is understandable that the first radiator shown in the schematic diagram of this embodiment should not be understood as a limitation on the main radiation provided by the embodiment of the present application.

[0047] The RF signal line is coupled with an adjacent conductive part to generate a parasitic current, and the RF signal line is used to radiate RF signals in the second frequency band under the action of the parasitic current. That is, the RF signal line is not designed to have the function of radiating RF signals, but radiates RF signals that do not actually have an effective communication function by generating parasitic currents through coupling. Among them, the conductive part adjacent to the RF signal line may be but is not limited to any radiating branch or any other RF signal line. That is, the RF signal line can be coupled with an adjacent radiating branch to generate a parasitic current, and can also be coupled with another adjacent RF signal line to generate a parasitic current. It should be noted that this embodiment does not limit the specific role of the conductive part, as long as the RF signal line can be coupled with it and generate a parasitic current, it falls within the protection scope of this embodiment.

[0048] like Figure 1As shown in, the electronic device may include at least two RF signal lines and multiple radiators, and the two RF signal lines are used to transmit low-frequency excitation signals and medium-high frequency excitation signals, respectively. Among them, the RF signal line used to transmit the low-frequency excitation signal can be coupled with the radiator located on the right to generate a parasitic current, and the RF signal line used to transmit the medium-high frequency excitation signal can be coupled with another radiator located at the bottom to generate a parasitic current, and the parasitic currents on the two RF signal lines can also interact with each other, thereby enhancing or weakening the parasitic current. Therefore, this embodiment does not limit the number of RF signal lines that can generate parasitic currents, nor does it limit the specific functions of the conductive parts coupled with the RF signal lines. As long as the RF signal lines can be coupled to generate parasitic currents, they all belong to the protection scope of this embodiment. It can be understood that the second frequency band of the RF signal radiated by the RF signal line is mainly affected by the electrical length of the RF signal line and the matching circuit connected thereto, and has nothing to do with the radiation frequency band corresponding to the conductive parts coupled thereto.

[0049] Among them, the second frequency band is staggered with the first frequency band. Specifically, by staggering the first frequency band corresponding to the first radiator and the second frequency band corresponding to the RF signal line, the radiation efficiency of the RF signal line in the first frequency band can be made lower than the threshold, thereby reducing the interference of the RF signal radiated by the RF signal line on the first radiator, and further reducing the deterioration effect of the antenna efficiency of the first frequency band of the first radiator. Optionally, the first frequency band can be higher than the second frequency band, or the first frequency band can be lower than the second frequency band, which is not limited here and can be specifically determined according to the actual working frequency band of the electronic device. Furthermore, the second frequency band radiated by the first radiator may not overlap with any working frequency band required by the electronic device, or the degree of overlap may have little effect on the working frequency band required by the electronic device, so as to ensure that the radiation performance of the electronic device in each frequency band is better.

[0050] In the embodiment of the application, by setting a first connection socket, a second connection socket, and a radio frequency signal line for connecting the first connection socket and the second connection socket, the excitation signal provided by the feed source on the main board can be transmitted from the main board to the small board, so that the excitation signal can be fed into the first radiator, so that the first radiator can radiate the radio frequency signal of the first frequency band under the action of the excitation signal. The radio frequency signal line can also transmit the ground signal from the main board to the small board, so that the first radiator can return to the ground nearby, thereby shortening the total length of the wiring in the electronic device. Moreover, for the parasitic current generated by coupling on the radio frequency signal line, this embodiment can improve the problem of clutter interference of the electronic device in the first frequency band by controlling the radiation frequency band of the radio frequency signal line to the second frequency band so that it is staggered with the first frequency band corresponding to the first radiator, thereby improving the radiation performance in the first frequency band and improving the communication quality of the electronic device. In addition, the technical solution of this embodiment can reduce the clutter interference of the radio frequency signal line with a relatively simple structure without the need for complex structures such as wire clamps and grounding rings, thereby simplifying the design of the antenna module and reducing the occupation of the battery compartment space, so that the electronic device can be equipped with a larger capacity battery to extend the battery life of the electronic device.

[0051] In one embodiment, the radio frequency signal line includes a coaxial connecting line, and the coaxial connecting line includes an inner conductor layer and an outer conductor layer. Specifically, the coaxial connecting line may further include an insulating layer and a protective layer, the insulating layer is used to isolate the inner conductor layer and the outer conductor layer, and the protective layer is arranged at the outermost layer to protect the inner conductor layer, the insulating layer and the outer conductor layer. Among them, the inner conductor layer of the coaxial connecting line is used to transmit radio frequency signals. The outer conductor layer of the coaxial connecting line is used to transmit ground signals and isolate electromagnetic interference to ensure the transmission quality of the excitation signal. The use of a coaxial connecting line to connect the main board and the small board can provide a clear and interference-free transmission of the excitation signal to improve the communication quality between the main board and the small board, and the coaxial connecting line has the characteristics of small size and softness, and can be well applied to the scene of small electronic devices such as mobile phones. It can be understood that in some embodiments, the main board and the small board can also be connected by means of wiring, flexible circuit boards, etc., which are not limited here.

[0052] In one embodiment, the second connection socket includes a ground output terminal for outputting a ground signal, and the small board is also provided with a matching circuit. The matching circuit is connected between the ground output terminal of the second connection socket and the ground plane of the small board, and the matching circuit is used to adjust the frequency band of the radiation signal of the radio frequency signal line to be offset from the first frequency band. The inventor has found that the clutter interference on the radio frequency signal line is mainly generated on the line used to transmit the ground signal, such as the outer conductor layer in the coaxial connection line. Therefore, as long as the transmission path of the ground signal is adjusted, the frequency band of the radio frequency signal line can be offset from the first frequency band.

[0053] Among them, since the mainboard side needs to achieve 50Ω impedance matching, the first connecting socket on the mainboard side needs to be directly lowered to the ground. In this embodiment, the matching circuit is arranged on the small board side, which will not affect the impedance matching on the mainboard side. It can be understood that compared with the application scenario in the related art where the matching circuit needs to adjust the radiation frequency band to the target frequency band, the matching circuit of this embodiment only needs to move the radiation frequency band of the RF signal line out of the target frequency band (that is, the first frequency band), without limiting the direction of the movement to the high frequency direction or the low frequency direction. Therefore, this embodiment has lower requirements for the matching circuit, and only a very small number of components need to be introduced into the matching circuit to move the resonance point of the RF signal line through a matching circuit with a relatively simple structure, thereby changing the radiation frequency band of the RF signal line to meet the requirement of staggering the first frequency band. Optionally, the introduced components include but are not limited to capacitors and inductors.

[0054] Figure 2 FIG. 1 is a partial schematic diagram of a small board of an embodiment, showing a second connection socket 10 on the small board, referring to FIG. Figure 2 In one embodiment, the small plate is provided with a first conductive layer 100 and a second conductive layer 200 spaced apart. The material of the first conductive layer 100 and the second conductive layer 200 may be, but is not limited to, copper, gold, silver and alloys of various metals. The ground output terminal 11 of the second connection seat 10 is connected to the first conductive layer 100, and the second conductive layer 200 serves as a ground plane. The first conductive layer 100 is provided with a first soldering pad 110, and the second conductive layer 200 is provided with a second soldering pad 210, and the matching circuit is connected to the first soldering pad 110 and the second soldering pad 210, respectively. That is, when the matching circuit is not connected, there is no electrical connection relationship between the first conductive layer 100 and the second conductive layer 200. In the embodiment of the application, by providing the first soldering pad 110 and the second soldering pad 210, it is convenient to connect different types of matching circuits, thereby meeting different frequency band offset requirements.

[0055] In one embodiment, the second connection base 10 includes a plurality of ground output terminals 11, and the first conductive layer 100 is provided with a plurality of first pads 110, and the second conductive layer 200 is provided with a plurality of second pads 210. The plurality of first pads 110 are respectively provided corresponding to the plurality of second pads 210. Among them, the number of the first pads 110 and the second pads 210 is the same, and one first pad 110 is respectively provided corresponding to one second pad 210 to form a matching position for setting a matching circuit. By setting a plurality of matching positions, the matching circuit can be connected to different positions on the small board according to requirements, and different matching circuits can be selected to be connected to different matching positions, thereby improving the setting flexibility of the matching circuit. Specifically, before the electronic device leaves the factory, the first solder pad 110 and the second solder pad 210 can be directly connected without setting up a matching circuit, and the overlap between the frequency band of the noise on the RF signal line and the first frequency band corresponding to the first radiator can be determined through testing, so as to determine the frequency band offset requirement, and then the components in the matching circuit, the connection method between the components and the corresponding matching positions are adaptively selected to accurately improve the effect of the frequency band offset, so that the second frequency band corresponding to the RF signal line is staggered with the first frequency band corresponding to the first radiator.

[0056] Further, the distance between the first pad 110 and the second pad 210 can be set according to the size of the matching circuit. For example, the distance between the first pad 110 and the second pad 210 is set to be approximately equal to the length of the capacitor or the inductor. The length of the capacitor refers to the size of the capacitor along the direction of the connection between the two pins, and the length of the inductor refers to the size of the inductor along the direction of the connection between the two pins.

[0057] In one embodiment, the radio frequency signal line is used to radiate radio frequency signals of the second frequency band in a half-wavelength loop antenna mode. Specifically, Figure 3 This is a simulation diagram of the current on the RF signal line without setting a matching circuit. Figure 4 This is a schematic diagram of the current on the RF signal line without a matching circuit. Figure 2 and Figure 4 In a mobile phone with a normal size, the RF signal line can just form a half-wavelength Loop mode. In the Loop mode, the resonance point of the RF signal line is just within the low-frequency band. Therefore, the clutter interference of the RF signal line will cause a significant deterioration in the efficiency of the first radiator used to radiate the low-frequency band. In the embodiment of the application, the resonance point of the half-wavelength Loop mode formed on the RF signal line can be shifted by adjusting the matching by the matching circuit, so that the clutter frequency band of the RF signal line is shifted to the second frequency band outside the first frequency band, reducing the interference of clutter on the radiation performance of the first radiator.

[0058] In one embodiment, the matching circuit includes a capacitor, and the capacitance value of the capacitor is determined according to the electrical length of the radio frequency signal line and the first frequency band. Figure 5 FIG. 1 is a schematic diagram of the current on the RF signal line when a matching circuit including a capacitor is provided in an embodiment, and FIG. Figure 4 and Figure 5 By adding a matching circuit including a capacitor, the resonance point of the RF signal line can be moved toward the small plate, thereby shifting the radiation frequency band of the RF signal line toward the high frequency. Based on the above matching circuit, the second frequency band can be 1 GHz to 1.6 GHz, thereby staggering the first frequency band of the low frequency band.

[0059] Figure 6 is a comparison diagram of the radiation efficiency of an electronic device under different capacitor connection conditions according to an embodiment, referring to Figure 6 , the black solid line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through a capacitor, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through a capacitor. The pink dotted line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through a capacitor, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. The red dotted line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through a capacitor. The blue dotted line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. Obviously, the clutter resonance points of the two RF signal lines in the blue dotted line are at 850MHz and 970MHz respectively, which are in the first frequency band of the low-frequency band. One resonance point in the pink dotted line and the red dotted line has shifted toward the high-frequency direction, while the clutter resonance points of the two RF signal lines in the black solid line are at 1.38GHz and 1.52GHz respectively, both of which are shifted out of the low-frequency band.

[0060] Figure 7 is a comparison diagram of the radiation efficiency and the total efficiency of an electronic device under different capacitor connection conditions according to an embodiment, referring to Figure 7, the black solid line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through a capacitor, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through a capacitor. The blue dot-dash line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. The red solid line shows the total efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through a capacitor, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through a capacitor. The orange dot-dash line shows the total efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. Obviously, by connecting the RF signal line of the excitation signal to the ground plane of the small board through a capacitor, the total efficiency in the low-frequency band can be improved by up to 2dB.

[0061] In one embodiment, the matching circuit includes an inductor, and the inductance value of the inductor is determined according to the electrical length of the radio frequency signal line and the first frequency band. Specifically, Figure 8 FIG. 1 is a schematic diagram of a current on a radio frequency signal line when a matching circuit including an inductor is provided in an embodiment, and FIG. Figure 4 and Figure 8 By adding a matching circuit including an inductor, the resonance point of the RF signal line can be moved toward the mainboard, thereby shifting the radiation frequency band of the RF signal line toward the low frequency. Based on the above matching circuit, the second frequency band can be lower than 0.8 GHz, thereby staggering with the first frequency band of the low frequency band.

[0062] Fig. 9 is a comparison diagram of the radiation efficiency of an electronic device under different inductor connection conditions according to an embodiment, referring to Fig. 9, the black solid line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through an inductor, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through an inductor. The pink dotted line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through an inductor, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. The red dotted line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through an inductor. The blue dotted line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. Obviously, the clutter resonance points of the two RF signal lines in the blue dotted line are at 850MHz and 970MHz respectively, which are in the first frequency band of the low-frequency band. One resonance point in the pink dotted line and the red dotted line has shifted toward the low-frequency direction, while the clutter resonance point in the black solid line is at 0.74GHz, which is shifted out of the low-frequency band.

[0063] Fig.10 is a comparison diagram of the radiation efficiency and the total efficiency of an electronic device under different inductor connection conditions according to an embodiment, referring to Fig.10 , the black solid line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through an inductor, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through an inductor. The blue dot-dash line shows the radiation efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. The red solid line shows the total efficiency curve when the RF signal line for transmitting low-frequency excitation signals is connected to the ground plane of the small board through an inductor, and the RF signal line for transmitting medium- and high-frequency excitation signals is connected to the ground plane of the small board through an inductor. The orange dot-dash line shows the total efficiency curve when the RF signal line for transmitting low-frequency excitation signals is directly connected to the ground plane of the small board, and the RF signal line for transmitting medium- and high-frequency excitation signals is directly connected to the ground plane of the small board. Obviously, by connecting the RF signal line of the excitation signal to the ground plane of the small board through an inductor, the total efficiency in the low-frequency band can be improved by up to 2dB.

[0064] Fig.11 This is a second structural diagram of an electronic device according to an embodiment, referring to Fig.11In one embodiment, when the resonant mode of the radio frequency signal line is a half-wavelength loop antenna mode, the electrical length of the radio frequency signal line is greater than twice the wavelength of the first frequency band. That is, in this embodiment, by physically extending the radio frequency signal line, the clutter of the radio frequency signal line is deflected out of the band in the low-frequency direction, thereby reducing the influence of the clutter of the radio frequency signal line on the radiation performance of the first radiator for radiating low-frequency signals.

[0065] Fig.12 FIG. 1 is an internal structure diagram of an electronic device according to an embodiment of the present invention. Fig.12 , the electronic device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The display screen of the electronic device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the housing of the electronic device, or an external keyboard, touchpad or mouse, etc.

[0066] Those skilled in the art will understand that Fig.12 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0067] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above embodiments only express several implementation methods of the embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the embodiments of the present application, and these all belong to the protection scope of the embodiments of the present application. Therefore, the protection scope of the patent of the embodiments of the present application shall be subject to the attached claims.

Claims

1. An electronic device, characterized in that: include: A mainboard, wherein the mainboard is provided with a first connecting socket; A small plate, wherein the small plate is provided with a second connecting seat; A first radiator, used for radiating a radio frequency signal in a first frequency band; A radio frequency signal line, wherein two ends of the radio frequency signal line are respectively connected to the first connection socket and the second connection socket, the radio frequency signal line is coupled with an adjacent conductive member to generate a parasitic current, and the radio frequency signal line is used to radiate a radio frequency signal of a second frequency band under the action of the parasitic current; The second frequency band is staggered with the first frequency band.

2. The electronic device according to claim 1, characterized in that: The second connection base includes a ground output terminal for outputting a ground signal, and the small board is further provided with: A matching circuit is connected between the ground output end of the second connection socket and the ground plane of the small board, and the matching circuit is used to adjust the frequency band of the radiation signal of the radio frequency signal line to be staggered with the first frequency band.

3. The electronic device according to claim 2, characterized in that: The small board is provided with a first conductive layer and a second conductive layer spaced apart from each other, the ground output end of the second connection socket is connected to the first conductive layer, and the second conductive layer serves as the ground plane; The first conductive layer is provided with a first pad, the second conductive layer is provided with a second pad, and the matching circuit is connected to the first pad and the second pad respectively.

4. The electronic device according to claim 3, characterized in that: The first conductive layer is provided with a plurality of the first pads; The second conductive layer is provided with a plurality of second pads, and the plurality of first pads are respectively provided corresponding to the plurality of second pads.

5. The electronic device according to claim 2, characterized in that: The matching circuit includes a capacitor, and a capacitance value of the capacitor is determined according to the electrical length of the radio frequency signal line and the first frequency band.

6. The electronic device according to claim 5, characterized in that: The first frequency band is a low frequency band, and the second frequency band is 1 GHz to 1.6 GHz.

7. The electronic device according to claim 2, characterized in that: The matching circuit includes an inductor, and the inductance value of the inductor is determined according to the electrical length of the radio frequency signal line and the first frequency band.

8. The electronic device according to claim 1, characterized in that: The radio frequency signal line is used to radiate radio frequency signals of the second frequency band in a half-wavelength loop antenna mode, and the electrical length of the radio frequency signal line is greater than twice the wavelength of the first frequency band.

9. The electronic device according to claim 7 or 8, characterized in that: The first frequency band is a low frequency band, and the second frequency band is lower than 0.8 GHz.

10. The electronic device according to claim 1, characterized in that: The radio frequency signal line comprises a coaxial connecting line, and the coaxial connecting line comprises an inner conductor layer and an outer conductor layer; The inner conductor layer of the coaxial connecting line is used to transmit radio frequency signals, and the outer conductor layer of the coaxial connecting line is used to transmit ground signals.

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