Electronic equipment and radiation spurious suppression assembly

Abstract

The invention discloses electronic equipment and a radiation spurious suppression assembly, and relates to the technical field of terminals and the technical field of antennas. Wherein the radiation spurious suppression circuit comprises one or more first devices; the radiation spurious suppression circuit comprises a first branch circuit and a second branch circuit which are connected in parallel, the first branch circuit comprises an inductor, and the second branch circuit comprises a capacitor; the first ends of the first branch and the second branch are connected with the same first device; the second ends of the first branch and the second branch are grounded; wherein the radiation spurious suppression circuit is used for reducing RSE generated by the first device. When the antenna works, the fundamental wave of the antenna enters the cavity in the electronic equipment, the current generated by the PIM effect on the electric connection contact surface of the first device in the cavity is transmitted to the radiation spurious suppression circuit, and the radiation spurious suppression circuit realizes energy loss, so that the radiation power of the harmonic wave is reduced; and therefore, radiation spurious suppression can be realized.

Description

Technical Field

[0001] This application relates to the field of antenna technology, and more particularly to an electronic device and a radiated stray emission suppression component. Background Technology

[0002] Radiated spurious emission (RSE) refers to electromagnetic radiation emitted by electronic devices outside their operating frequency range. Because this electromagnetic radiation is outside the expected operating frequency range, it may affect the operation of the components inside the electronic device.

[0003] Currently, electronic devices may contain multiple electrical connection devices with nonlinear electrical performance parameters. These electrical connection devices, also known as electronic connectors, circuit connectors, electrical connectors, or connectors, are used to bridge two conductors in a circuit, allowing current or signals to flow from one conductor to another.

[0004] These electrical connectors can be used to connect printed circuit boards (PCBs) to the mid-frame, PCBs to the screen metal frame, PCBs to fingerprint recognition circuits, PCBs to antennas, PCBs to camera modules, etc. When the side antenna of an electronic device is working, the fundamental wave of the side antenna enters the cavity inside the electronic device. Due to the passive intermodulation (PIM) effect, harmonics are generated at the electrical connection contact surfaces of the electrical connectors in the cavity. These harmonics are then radiated outward through the cavity or antenna, resulting in a significant RSE (Reduction of Sequence) effect. Summary of the Invention

[0005] To address the aforementioned problems, this application provides an electronic device and a radiated stray emission suppression component, which can suppress radiated stray emissions.

[0006] In a first aspect, this application provides an electronic device comprising: a radiated spurious emission suppression circuit and one or more first devices. The radiated spurious emission suppression circuit includes a first branch and a second branch connected in parallel, the first branch including an inductor and the second branch including a capacitor; the first terminals of the first branch and the second branch are connected to the same first device; the second terminals of the first branch and the second branch are grounded. The radiated spurious emission suppression circuit is used to reduce the radiated spurious emission (RSE) generated by the first device.

[0007] This solution incorporates a radiated spurious emission suppression circuit within the electronic device. Since this circuit is connected between the first device and ground, it creates an LC resonant circuit at a specific frequency between the electrical connection device and ground. When the antenna operates, the fundamental frequency of the antenna enters the cavity inside the electronic device. At the electrical connection contact surface of the electrical connection device within the cavity, the current excited by the PIM effect is transmitted to the LC resonant circuit. The LC circuit gradually dissipates this energy through resonance, resulting in a decrease in the radiated harmonic power and thus suppressing radiated spurious emissions. Simultaneously, the electrical connection device can alter the characteristic mode transmission characteristics of the resonant cavity, thereby changing the cavity's resonant frequency. This ensures that the cavity's resonant frequency is no longer within the antenna's operating frequency band, eliminating cavity clutter and guaranteeing the antenna's gain.

[0008] In one possible implementation, the first branch and / or the second branch also include resistors.

[0009] In this implementation, by setting a resistor, the suppression bandwidth of the radiated spurious emissions suppression circuit is broadened, meaning the circuit exhibits high suppression effectiveness over a wider bandwidth. Furthermore, the resistor allows for faster energy dissipation.

[0010] In one possible implementation, the electrical connection device is one of the following: a metal spring, conductive foam, or a metal screw. All of these types of electrical connection devices are nonlinear devices whose electrical performance parameters exhibit nonlinearity.

[0011] In one possible implementation, the resonant frequencies of the capacitor and inductor are integer multiples of the center frequency of the antenna's operating frequency in the electronic device. In this case, the radiated spurious emission suppression circuit forms an LC resonant circuit with a specific resonant frequency between the first device and ground. Since the resonant frequency is determined for harmonics, the current excited by the PIM effect can be transmitted to the LC resonant circuit. The LC circuit gradually dissipates this energy through resonance, thereby reducing RSE.

[0012] In one possible implementation, the first device is an electrical connection device made of a conductive material. The electronic device also includes a second device and a third device. The electrical connection device is electrically connected to the second device and is located between the second device and the third device. In this case, the electrical connection device can be used to change the resonant frequency of the cavity, so that the resonant frequency of the cavity is no longer within the antenna's operating frequency band, meaning that cavity clutter no longer appears within the antenna's operating frequency band, thus ensuring the antenna gain. The cavity can be a cavity formed by the second and third devices, or a cavity formed by the second device and other devices.

[0013] In one possible implementation, the second device is the screen metal frame of the electronic device, and the third device is the middle frame of the electronic device. In this case, the connector device can be used to change the resonant frequency of the cavity formed by the screen metal frame and the middle frame, so that the resonant frequency of the cavity is no longer within the operating frequency band of the antenna, thus ensuring the antenna gain.

[0014] In one possible implementation, the electronic device specifically includes a first electrical connection device, the middle frame includes a flexible circuit board (FPC); a radiated stray emission suppression circuit is located on the FPC, and the second end of the first branch and the second end of the second branch are grounded on the FPC, the FPC is fixed to the middle frame; the first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device.

[0015] In this implementation, when the antenna is working, the fundamental wave of the antenna enters the cavity inside the electronic device. At the electrical connection contact surface of the first electrical connection device in the cavity, the current generated by the PIM effect is transmitted to the radiated spurious suppression circuit through the first electrical connection device. The radiated spurious suppression circuit realizes energy loss, thereby reducing the radiated power of the harmonics and thus suppressing radiated spurious signals.

[0016] In one possible implementation, the electronic device specifically includes a first electrical connection device, a mid-frame including a flexible printed circuit board (FPC), a radiated spurious emission suppression circuit located on the FPC, and a second end of a first branch and a second end of a second branch connected to a first portion of the mid-frame, the first portion of the mid-frame being insulated from the rest of the mid-frame, and the FPC being fixed to the mid-frame. The first end of the first branch and the first end of the second branch are connected to a screen metal frame via the first electrical connection device.

[0017] In this implementation, by reusing the first part of the middle frame, the addition of a metal base can be avoided, saving materials and reducing costs.

[0018] In one possible implementation, the second device is the screen metal frame of the electronic device, and the third device is the printed circuit board (PCB) of the electronic device.

[0019] In one possible implementation, the electronic device specifically includes a first electrical connection device and a second electrical connection device, and the electronic device also includes a mid-frame. The second end of the first branch and the second end of the second branch are grounded on the PCB; the first end of the first branch and the first end of the second branch are connected to a first portion of the mid-frame through the first electrical connection device, the first portion of the mid-frame is insulated from the rest of the mid-frame, and the first portion of the mid-frame is connected to the screen metal frame through the second electrical connection device.

[0020] In this implementation, when the antenna is working, after the fundamental wave of the antenna enters the cavity inside the electronic device, the current generated by the PIM effect at the electrical connection contact surface of the first electrical connection device and the second electrical connection device in the cavity is transmitted to the radiation spurious suppression circuit through the conductive path formed by the electrical connection device, the electrical connection device and the first part. The radiation spurious suppression circuit realizes energy loss, thereby reducing the radiation power of the harmonics and thus suppressing the radiation spurious.

[0021] The addition of a second electrical connection device to the screen's metal frame, and the through-groove filled with insulating material on the metal middle frame, can also alter the characteristic mode transmission characteristics of the resonant cavity formed by the screen's metal frame and the metal middle frame.

[0022] In one possible implementation, the electronic device specifically includes a first electrical connection device, and the electronic device also includes a mid-frame; the second end of the first branch and the second end of the second branch are grounded on the PCB; the mid-frame includes a through hole, and the first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device, which is insulated from the mid-frame through the through hole.

[0023] In this implementation, when the antenna is working, the fundamental wave of the antenna enters the cavity inside the electronic device. At the electrical connection contact surface of the first electrical connection device in the cavity, the current generated by the PIM effect is transmitted to the radiated spurious suppression circuit through the first electrical connection device. The radiated spurious suppression circuit realizes energy loss, thereby reducing the radiated power of the harmonics and thus suppressing radiated spurious signals.

[0024] In one possible implementation, the electronic device also includes a transient voltage suppressor diode (TVS), with the second terminal of the first branch and the second terminal of the second branch grounded through the TVS.

[0025] In this implementation, a TVS (Transient Voltage Suppressor) is used to achieve electrostatic discharge (ESD) protection. When ESD occurs, the TVS conducts, clamping the voltage in the radio frequency path to achieve protection. Furthermore, the TVS can be considered a non-linear electrical connection device that generates RSE (Radiated Sequence Emissions) during ESD. The radiated spurious emission suppression circuit can also reduce the radiated spurious emissions caused by ESD.

[0026] In one possible implementation, the first device is an antenna, or the first device is a fingerprint recognition circuit, or the first device is a camera module.

[0027] In this implementation, when electrostatic discharge is present, the radiated stray emission suppression circuit can also reduce the radiated stray emissions of the TVS caused by electrostatic discharge.

[0028] Secondly, this application also provides a radiated spurious emission suppression component, comprising: a radiated spurious emission suppression circuit, one or more first devices, second devices, and third devices. The radiated spurious emission suppression circuit includes a first branch and a second branch connected in parallel, the first branch including an inductor and the second branch including a capacitor; the first terminals of the first and second branches are connected to the same first device; the second terminals of the first and second branches are grounded; the first device is an electrical connection device, the electrical connection device is electrically connected to the second device, and the electrical connection device is located between the second and third devices. The radiated spurious emission suppression circuit is used to reduce the radiated spurious emission (RSE) generated by the first device.

[0029] In this implementation, the radiated spurious emission suppression circuit of the radiated spurious emission suppression component is connected between the first device and ground, thus forming an LC resonant circuit at a specific frequency between the electrical connection device and ground. When the antenna is working, the fundamental frequency of the antenna enters the cavity inside the electronic device. At the electrical connection contact surface of the electrical connection device in the cavity, the current excited by the PIM effect is transmitted to the LC resonant circuit. The LC circuit gradually dissipates this energy through resonance, resulting in a decrease in the radiated power of the harmonics, thereby suppressing radiated spurious emissions. At the same time, the electrical connection device can also change the characteristic mode transmission characteristics of the resonant cavity, thereby changing the resonant frequency of the cavity, so that the resonant frequency of the cavity is no longer within the antenna's operating frequency band. That is, cavity clutter no longer appears within the antenna's operating frequency band, ensuring the antenna gain.

[0030] In one possible implementation, the second device is the screen metal frame of the electronic device, and the third device is the middle frame of the electronic device. In this implementation, the connector device can be used to change the resonant frequency of the cavity formed by the screen metal frame and the middle frame, so that the resonant frequency of the cavity is no longer within the operating frequency band of the antenna, thus ensuring the antenna gain.

[0031] In one possible implementation, the radiated spurious suppression component specifically includes a first electrical connection device, the middle frame includes a flexible circuit board (FPC); the radiated spurious suppression circuit is located on the FPC, and the second end of the first branch and the second end of the second branch are grounded on the FPC, the FPC is fixed to the middle frame; the first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device.

[0032] In this implementation, when the antenna is working, the fundamental wave of the antenna enters the cavity inside the electronic device. At the electrical connection contact surface of the first electrical connection device in the cavity, the current generated by the PIM effect is transmitted to the radiated spurious suppression circuit through the first electrical connection device. The radiated spurious suppression circuit realizes energy loss, thereby reducing the radiated power of the harmonics and thus suppressing radiated spurious signals.

[0033] In one possible implementation, the radiated spurious emission suppression component specifically includes a first electrical connection device, and the mid-frame includes a flexible printed circuit board (FPC). A radiated spurious emission suppression circuit is located on the FPC, and the second ends of the first branch and the second branches are connected to a first portion of the mid-frame. The first portion of the mid-frame is insulated from the rest of the mid-frame, and the FPC is fixed to the mid-frame. The first ends of the first branch and the second branches are connected to the screen metal frame via the first electrical connection device. In this implementation, by reusing the first portion of the mid-frame, the addition of a metal ground plane can be avoided, saving materials and reducing costs.

[0034] In one possible implementation, the second device is the screen metal frame of the electronic device, and the third device is the printed circuit board (PCB) of the electronic device.

[0035] In one possible implementation, the radiated spurious suppression component specifically includes a first electrical connection device and a second electrical connection device, and the radiated spurious suppression component also includes a middle frame; the second end of the first branch and the second end of the second branch are grounded on the PCB; the first end of the first branch and the first end of the second branch are connected to the first part of the middle frame through the first electrical connection device, the first part of the middle frame is insulated from the rest of the middle frame, and the first part of the middle frame is connected to the screen metal frame through the second electrical connection device.

[0036] In this implementation, when the antenna is working, after the fundamental wave of the antenna enters the cavity inside the electronic device, the current generated by the PIM effect at the electrical connection contact surface of the first electrical connection device and the second electrical connection device in the cavity is transmitted to the radiation spurious suppression circuit through the conductive path formed by the electrical connection device, the electrical connection device and the first part. The radiation spurious suppression circuit realizes energy loss, thereby reducing the radiation power of the harmonics and thus suppressing the radiation spurious.

[0037] In one possible implementation, the radiated spurious suppression component specifically includes a first electrical connection device, and the radiated spurious suppression component also includes a mid-frame; the second end of the first branch and the second end of the second branch are grounded on the PCB; the mid-frame includes a through-hole, and the first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device, which is insulated from the mid-frame through the through-hole.

[0038] In this implementation, when the antenna is working, the fundamental wave of the antenna enters the cavity inside the electronic device. At the electrical connection contact surface of the first electrical connection device in the cavity, the current generated by the PIM effect is transmitted to the radiated spurious suppression circuit through the first electrical connection device. The radiated spurious suppression circuit realizes energy loss, thereby reducing the radiated power of the harmonics and thus suppressing radiated spurious signals.

[0039] In one possible implementation, the resonant frequencies of the capacitor and inductor are integer multiples of the center frequency of the antenna's operating frequency in the electronic device. In this implementation, the radiated spurious emission suppression circuit forms an LC resonant circuit with a specific resonant frequency between the first device and ground. Since the resonant frequency is determined for harmonics, the current excited by the PIM effect can be transmitted to the LC resonant circuit. The LC circuit gradually dissipates this energy through resonance, thereby reducing RSE.

[0040] In one possible implementation, the electrical connection device is one of the following: a metal spring, conductive foam, or a metal screw. Other devices, such as a TVS or a board-to-board connector, may also be used.

[0041] In one possible implementation, the first branch and / or the second branch also include resistors. In this implementation, by adding resistors, the suppression bandwidth of the radiated spurious emission suppression circuit is broadened, meaning the circuit exhibits higher suppression effectiveness over a wider bandwidth. Furthermore, resistors allow for faster and more efficient energy dissipation. Attached Figure Description

[0042] Figure 1A A schematic diagram of an electronic device provided in this application;

[0043] Figure 1B Scenario diagram 1 provided for this application;

[0044] Figure 2 A schematic diagram of a radiated stray emission suppression circuit provided in an embodiment of this application;

[0045] Figure 3 A schematic diagram of the simulation results provided for the embodiments of this application;

[0046] Figure 4 A schematic diagram of the simulation results provided for the embodiments of this application. Figure 2 ;

[0047] Figure 5 A schematic diagram of a radiation spur suppression circuit including a resistor provided for an embodiment of this application;

[0048] Figure 6 A schematic diagram of the simulation results provided for the embodiments of this application. Figure 3 ;

[0049] Figure 7A A simulation diagram of antenna radiation efficiency provided for an embodiment of this application;

[0050] Figure 7B Simulation illustration of antenna radiation efficiency provided for embodiments of this application Figure 2 ;

[0051] Figure 8 A schematic diagram of an electronic device including a radiated stray emission suppression circuit provided for an embodiment of this application;

[0052] Figure 9A A schematic diagram of another electronic device including a radiated stray emission suppression circuit provided for an embodiment of this application;

[0053] Figure 9B A schematic diagram of another electronic device including a radiated stray emission suppression circuit provided in an embodiment of this application;

[0054] Figure 10 A schematic diagram of another electronic device including a radiated stray emission suppression circuit provided in an embodiment of this application;

[0055] Figure 11 A schematic diagram of another electronic device including a radiated stray emission suppression circuit provided for an embodiment of this application;

[0056] Figure 12 A schematic diagram of another radiated stray emission suppression circuit provided in an embodiment of this application;

[0057] Figure 13 Simulation illustration of antenna radiation efficiency provided for embodiments of this application Figure 3 ;

[0058] Figure 14 Simulation illustration of antenna radiation efficiency provided for embodiments of this application Figure 4 ;

[0059] Figure 15 A scenario illustration provided for an embodiment of this application. Figure 2 ;

[0060] Figure 16 A scenario illustration provided for an embodiment of this application. Figure 3 ;

[0061] Figure 17 Provided for the embodiments of this application Figure 16 Corresponding side view;

[0062] Figure 18 This is a schematic diagram of another electronic device provided in an embodiment of this application. Detailed Implementation

[0063] To enable those skilled in the art to better understand the solution of this application, the application scenario of the technical solution of this application will be described first below.

[0064] In electronic devices, there may be multiple nonlinear connection points where electrical performance parameters are nonlinear. For ease of explanation, the following example uses a metal spring between the screen metal frame and the metal middle frame of the electronic device as a nonlinear connection point.

[0065] See Figure 1A The figure is a schematic diagram of an electronic device provided in this application.

[0066] Electronic devices may include a screen metal frame 10, a metal middle frame 20, and a printed circuit board (PCB) 30.

[0067] The screen metal frame 10 is used to fix and mount the display screen of the electronic device. The display screen can be a liquid crystal display (LCD) screen, an organic light-emitting diode (OLED) screen, an active-matrix organic light-emitting diode (AMOLED) screen, a flexible light-emitting diode (FLED) screen, a Mini-LED screen, a Micro-LED screen, a Micro-OLED screen, a quantum dot light-emitting diode (QLED) screen, etc.

[0068] The middle frame 2 is located in the middle of the electronic device, between the screen metal frame 10 and the PCB 30. In one possible implementation, the middle frame 2 is made of metal.

[0069] PCB30 is used to carry multiple electronic components.

[0070] The side frames of the metal frame 20 can be reused as antennas for electronic devices, as shown by antenna 50 in the figure. In practical applications, the side frames of the metal frame 20 can be divided into multiple segments according to actual needs, so as to be reused as multiple antennas. These antennas can be referred to as side antennas. This application does not specify the number of side antennas or their operating frequency bands.

[0071] The screen metal frame 10 forms a resonant cavity with the metal mid-frame 20 of the electronic device, causing cavity clutter in the antenna's operating frequency band, which in turn leads to a decrease in antenna gain and affects the transmission of wireless signals.

[0072] To solve this problem, the current solution is to place a metal spring 31 between the screen metal frame 10 and the metal mid-frame 20. For example... Figure 1BThe schematic diagram of the scenario shown illustrates how connecting the screen metal frame 10 and the metal middle frame 20 using a metal spring 31 alters the characteristic mode transmission characteristics of the resonant cavity, thereby changing its resonant frequency. This prevents the cavity's resonant frequency from falling within the antenna's operating frequency band, thus eliminating cavity clutter and ensuring antenna gain. The metal spring 31 can also be replaced with conductive foam or other types of electrical connection devices.

[0073] However, after the metal spring 31 is set, when the fundamental wave of the antenna of the electronic device enters the cavity, harmonics will be generated on the contact surface where the metal spring 31 contacts the screen metal frame 10 and the contact surface where the metal spring 31 contacts the metal middle frame 20 due to the PIM effect. Then, the harmonics will be radiated to the outside through the cavity or antenna and other radiators, which will lead to a large RSE.

[0074] To address the above technical problems, this application provides an electronic device and a radiated spurious emission suppression component. It utilizes inductors and capacitors to form a resonant circuit at a specific frequency. This specific frequency corresponds to the frequency of harmonics generated at electrical connection devices in the cavity, thereby achieving the loss of harmonic energy and thus suppressing radiated spurious emissions.

[0075] To enable those skilled in the art to more clearly understand the technical solution of this application, the implementation of the solution of this application is described in detail below with reference to the accompanying drawings.

[0076] It is understood that the directional names such as "up", "down", "left", and "right" in the following embodiments of this application are only for illustrative purposes and should be referred to the directions in the accompanying drawings. They do not constitute a limitation on the technical solution of this application.

[0077] The terms "first" and "second" used in this application description are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0078] In this application, unless otherwise expressly specified and limited, the term "connection" shall be interpreted broadly. For example, "connection" may be a fixed connection, a detachable connection, or an integral part; it may be a direct connection or an indirect connection through an intermediate medium.

[0079] See Figure 2 The figure is a schematic diagram of a radiation stray emission suppression circuit provided in an embodiment of this application.

[0080] The radiated stray emission suppression circuit is used to reduce the RSE generated by the first device.

[0081] The radiated stray emission suppression circuit includes a first branch B1 and a second branch B2 connected in parallel.

[0082] The first branch B1 includes an inductor L, and the second branch B2 includes a capacitor C. The first end of the first branch B1 and the first end of the second branch B2 are connected to an electrical connection device 30.

[0083] The electrical connection device 30 in this application embodiment can be called an electronic connector, circuit connector, electrical connector or connector, used to bridge two conductors in a circuit so that current or signal can flow from one conductor to the other.

[0084] The electrical connection devices in this application embodiment can specifically be electrical connection devices with nonlinear electrical performance parameters, such as, but not limited to, metal springs, conductive foam, and metal screws. When the fundamental wave of the antenna enters the cavity inside the electronic device, the electrical connection contact surfaces of these electrical connection devices with nonlinear electrical performance parameters are more prone to generating harmonics due to the PIM effect. These harmonics are then radiated outwards through the cavity or antenna, leading to radiosistive emissions (RSE). It is understood that for electrical connection devices with linear electrical performance parameters, when the fundamental wave of the antenna enters the internal cavity of the electronic device, harmonics will also be generated at the electrical connection contact surfaces due to the PIM effect. However, the PIM effect is weaker, and the generated harmonic energy is smaller, resulting in a smaller RSE. Nevertheless, the radiated spurious emission suppression circuit provided in this application can still be used to reduce the harmonics generated by the PIM effect. The solution in this application embodiment is more effective in suppressing RSE for electrical connection devices with nonlinear electrical performance parameters.

[0085] Furthermore, the first terminal of the first branch B1 and the first terminal of the second branch B2 can also be connected to components susceptible to electrostatic discharge (ESD), such as antennas, fingerprint recognition circuits, and the output terminals of camera modules. The second terminals of the first and second branches are connected to separate grounds, which are made of metallic materials and can be called metal grounds, capable of storing charge. The radiated spurious emission suppression circuit guides the resonant current generated by the electrically connected devices to the metal ground, effectively storing the energy generated by the PIM effect. The radiated spurious emission suppression circuit gradually dissipates this energy through resonance, for example, through device heating, preventing this energy from being used to generate harmonics and thus reducing RSE.

[0086] It is understandable that, since the current in the radiated spurious emission suppression circuit includes harmonic current, in order to avoid interference with other grounded components of the electronic device, the ground connected to the radiated spurious emission suppression circuit is a separate ground. A separate ground means that the radiated spurious emission suppression circuit is not grounded with other circuit components. For example, a metal can be provided on the electronic device as the ground of the radiated spurious emission suppression circuit, and this metal is not connected to any other circuit components except for the radiated spurious emission suppression circuit.

[0087] The working principle of the first terminal of the first branch B1 and the first terminal of the second branch B2 when connected to the electrical connection device 30 is explained below.

[0088] When no radiated spurious suppression circuit is provided, if the electrical connection device is directly grounded, the resonant current generated by the electrical connection device is directly conducted to the metal ground. However, since both the electrical connection device and the metal ground in the circuit are good conductors, and there are no other additional energy storage or dissipation components, the energy excited by the electrical connection device due to the PIM effect cannot be dissipated in time. This energy is then used to excite harmonics, resulting in RES. Therefore, the solution implemented in this application adds a radiated spurious suppression circuit between the electrical connection device and the metal ground to dissipate energy and reduce the energy used to excite harmonics. The resonant frequency f of the radiated spurious suppression circuit satisfies the following formula with respect to the capacitor C and the inductor L:

[0089] f = 1 / [2π(LC)] 1 / 2 (1)

[0090] In one possible implementation, the resonant frequency can be an integer multiple of the center frequency of the antenna's operating frequency. Furthermore, the resonant frequency can be greater than the center frequency, for example, two or three times the center frequency. Specifically, it can be the same as the harmonics generated by the PIM effect; for example, if the harmonics are twice the center frequency, then the resonant frequency can correspond to twice the center frequency. The antenna can be a side antenna of the electronic device.

[0091] It is understood that the resonant frequency is not specifically limited in the embodiments of this application. This is because in practical applications, due to the nonlinear characteristics of electrical connection devices, the correspondence between the harmonics generated by the PIM effect and the fundamental frequency may be different in different electronic devices. Therefore, it is necessary to calibrate for different electronic devices separately.

[0092] The principle of the radiated spurious emission suppression circuit is that when the electrical connection device generates harmonics at the electrical connection contact surface due to the PIM effect, the radiated spurious emission suppression circuit is connected between the electrical connection device and ground. Therefore, an LC resonant circuit with a specific resonant frequency is formed between the electrical connection device and ground. Since the resonant frequency is determined for the harmonics, the current excited by the PIM effect can be transmitted to the LC resonant circuit. The LC circuit gradually consumes this part of the energy through resonance, for example, through the heat dissipation of the device, so that this energy cannot be used to excite harmonics, thereby reducing RSE.

[0093] The technical effectiveness of the radiated stray emission suppression circuit is illustrated below with specific simulation results.

[0094] See Figure 3 The figure shown is a schematic diagram of the simulation results provided in the embodiment of this application.

[0095] Figure 3 In the simulation diagrams below, the horizontal axis represents frequency in GHz, and the vertical axis represents radiation efficiency in dB.

[0096] Figure 3 Curve 1-1 in the figure shows the radiation efficiency curve of the metal spring when the electrical connection device is a metal spring and the electrical connection contact surface (i.e., the PIM position) is excited, without the radiation stray suppression circuit.

[0097] Taking an inductor with an inductance of 0.7nH and a capacitor with a capacitance of 1.7pF as an example, Figure 3 Curves 1-2 in the figure show the radiation efficiency curves of the metal spring when the excitation electrical connection contact surface is set after the radiation spur suppression circuit is installed. It can be seen that the maximum decrease in radiation efficiency can reach about 10dB, which shows a significant effect on suppressing radiation spurs.

[0098] See Figure 4 This figure is a schematic diagram of the simulation results provided in the embodiments of this application. Figure 2 .

[0099] Figure 4 In the example, the inductance of the inductor is 0.5nH and the capacitance of the capacitor is 0.7pF. Figure 4 Curve 2-1 in the figure shows the radiation efficiency curve of the metal spring when the electrical connection contact surface is excited after setting the radiated spurious emission suppression circuit. It can be seen that the maximum decrease in radiation efficiency can reach about 6dB, which shows a significant effect on suppressing radiated spurious emissions. Furthermore, by adjusting the component parameters of the inductor and capacitor, the suppression frequency band of the radiated spurious emission suppression circuit can be changed. Therefore, the solution of this application can be adapted to different electronic devices or different electrical connection devices, which is highly flexible and practical.

[0100] Furthermore, although the inductor and capacitor of the radiation spur suppression circuit in the above embodiments can suppress the radiation efficiency of harmonics, since the inductor and capacitor are difficult to dissipate energy quickly, in order to achieve more efficient energy dissipation and improve the suppression effect, a resistor can be further added to the radiation spur suppression circuit, which will be explained in detail below with reference to the accompanying drawings.

[0101] See Figure 5 The figure is a schematic diagram of a radiation stray emission suppression circuit including resistors provided in an embodiment of this application.

[0102] The resistor can be set on the first branch B1 and / or on the second branch B2.

[0103] Specifically, for Figure 5 In 5-(1), resistor R1 is set on the first branch B1, the first end of R1 is connected to the inductor, and the second end is grounded; for Figure 5 In section 5-(2), resistor R2 is placed on the second branch B2, with the first end of R2 connected to a capacitor and the second end grounded; for Figure 5 In 5-(3), resistor R1 is set on the first branch B1, the first end of R1 is connected to an inductor and the second end is grounded, and resistor R2 is set on the second branch B2, the first end of R2 is connected to a capacitor and the second end is grounded.

[0104] Among them, for methods 5-(1) and 5-(2), since only the grounding position and the resistor position are interchanged, the suppression effect on radiated stray radiation is basically the same.

[0105] The following is about Figure 5 The radiation spurious suppression circuit shown in (1) is simulated.

[0106] See Figure 6 This figure is a schematic diagram of the simulation results provided in the embodiments of this application. Figure 3 .

[0107] Figure 6 Curve 3-1 in the figure shows the radiation efficiency curve of the metal spring when the electrical connection device is a metal spring and the electrical connection contact surface (i.e., the PIM position) is excited, without the radiation stray suppression circuit.

[0108] Taking an inductor with an inductance of 0.75nH, a capacitor with a capacitance of 1.7pF, and a resistor with a resistance of 10 ohms as an example.

[0109] Figure 6 Curve 3-2 in the figure shows the radiation efficiency curve of the metal spring when the excitation is electrically connected to the contact surface, but the circuit does not include a resistor. It can be seen that the maximum decrease in radiation efficiency can reach about 7dB, which shows a significant effect on suppressing radiation spurious emissions.

[0110] Figure 6 Curve 3-3 in the figure shows the radiation efficiency curve of the metal spring when the excitation electrical connection contact surface is set with a radiated stray emission suppression circuit but including a resistor in the circuit. It can be found that the maximum decrease in radiation efficiency can reach about 11dB, which is a further decrease of 4dB compared to curve 3-2. In addition, by adding a resistor, the suppression bandwidth of radiated stray emissions in curve 3-3 is widened, that is, the radiated stray emission suppression circuit has a high suppression effect over a wider bandwidth.

[0111] Furthermore, by adding the radiated spurious emission suppression circuit of this application to the electronic device, it is possible to suppress radiated spurious emissions while having virtually no impact on the antenna's radiation efficiency. This will be explained in detail below with reference to simulation results.

[0112] See also Figure 7A and Figure 7B.in, Figure 7A A simulation diagram of antenna radiation efficiency provided for an embodiment of this application; Figure 7B Simulation illustration of antenna radiation efficiency provided for embodiments of this application Figure 2 .

[0113] Figure 7A Curve 7-1 in the figure represents the antenna's radiation efficiency without a radiated spurious suppression circuit. Curve 7-2 represents the efficiency with a radiated spurious suppression circuit, and the radiated spurious suppression circuit is... Figure 5 The implementation shown in 5-(1) is the antenna's radiation efficiency. It can be observed that curves 7-1 and 7-2 basically overlap, with the maximum radiation efficiency decrease controlled within 0.2 dB, appearing at... Figure 7A Within the dashed box area.

[0114] Figure 7B Curve 8-1 in the figure represents the antenna's radiation efficiency without a radiated spurious suppression circuit. Curve 8-2 represents the efficiency with a radiated spurious suppression circuit, and the radiated spurious suppression circuit is... Figure 5 The implementation shown in 5-(2) is the antenna's radiation efficiency. It can be observed that curves 8-1 and 8-2 basically overlap, with the maximum radiation efficiency decrease controlled within 0.12 dB, appearing at... Figure 7B Within the dashed box area.

[0115] This verifies that the proposed solution has virtually no impact on the antenna's radiation efficiency.

[0116] In the above embodiments, the antennas generating the fundamental frequency on the electronic device include, but are not limited to, low-band (LB) antennas and middle-high (MHB) antennas. The LB band covers 0.7 GHz to 0.96 GHz, and the middle-high frequency band covers 1.71 GHz to 2.7 GHz. It is understood that the above frequency band division is only one implementation method; in other frequency band division methods, the frequency range covered by the above middle-high frequency band may differ slightly, for example, the upper and / or lower limits of the frequency range may be slightly larger or smaller. The resonant frequencies of the inductor and capacitor in the radiated spurious emission suppression circuit can be set based on the fundamental frequency of the antenna. In practical applications, the resonant frequency can be set to different integer multiples of the fundamental frequency of the antenna, and then tested separately to determine the resonant frequency with the best radiated spurious emission suppression effect. Then, the parameters of the inductor and capacitor are determined based on the resonant frequency.

[0117] The following describes the specific implementation of electronic devices and radiated spurious emission suppression circuits when using radiated spurious emission suppression circuits to reduce the relative seismic emissions (RSE) generated by electrical connection devices. The electrical connection devices in the embodiments of this application include, but are not limited to, metal springs, conductive foam, and metal screws.

[0118] See Figure 8 The figure is a schematic diagram of an electronic device including a radiated stray emission suppression circuit provided in an embodiment of this application.

[0119] Electronic devices may include one or more electrical connection devices. Figure 8 Taking only one electrical connection device 44 as an example, when one electrical connection device is included, the screen metal frame 10 is connected to the radiated spurious suppression circuit 41 through the electrical connection device. The metal ground 42 connected to the radiated spurious suppression circuit 41 is a separate ground, that is, the metal ground 42 is not connected to any other circuit components except for the radiated spurious suppression circuit 41.

[0120] When an electronic device includes multiple electrical connection devices, the multiple electrical connection devices can extend the circuit path so that the radiated stray emission suppression circuit 41 and the metal ground 42 can be placed at the target location.

[0121] The radiated stray emission suppression circuit 41 can be adopted Figure 2 or Figure 5 The implementation shown demonstrates that the radiated spurious emission suppression circuit 41 has a significant suppression effect on RSE (Resonant Segregation of Energy). When the antenna is operating, the fundamental wave of the antenna enters the cavity inside the electronic device. Due to the PIM (Positive Intensity Modulation) effect, current generated at the electrical connection contact surface of the electrical connection device 44 within the cavity is transmitted through the electrical connection device 44 to the radiated spurious emission suppression circuit 41. The radiated spurious emission suppression circuit dissipates energy, reducing the radiated power of harmonics and thus suppressing radiated spurious emissions. Simultaneously, the electrical connection device 44 added to the screen metal frame 10 can also change the characteristic mode transmission characteristics of the resonant cavity formed by the screen metal frame 10 and the metal middle frame, thereby changing the resonant frequency of the cavity. This ensures that the resonant frequency of the cavity is no longer within the antenna's operating frequency band, meaning that cavity clutter no longer appears within the antenna's operating frequency band, thus guaranteeing the antenna gain. This antenna can be a side antenna for an electronic device.

[0122] The following section first explains how the screen metal frame and the metal middle frame 20 are connected by an electrical connector.

[0123] See Figure 9A The figure is a schematic diagram of another electronic device including a radiated stray emission suppression circuit provided in an embodiment of this application.

[0124] A flexible printed circuit (FPC) 21 is disposed on the middle frame 20. The flexible circuit board 21 is used to carry the radiated stray emission suppression circuit 41 and the metal ground 42. The middle frame 20 and the flexible circuit board 21 can be fixed by adhesive or by a limiting structure, which is not specifically limited in this embodiment. The flexible circuit board 21 is chosen because it has a thinner thickness and lighter weight than a PCB, making it easier to fix to the middle frame 20.

[0125] The radiated stray emission suppression circuit 41 is located on the flexible circuit board FPC21, and the second end of the first branch and the second end of the second branch are connected to the metal ground 42 on the FPC.

[0126] In this embodiment, the metal ground 42 can be a metal block, metal sheet, or metal plate separately disposed on the FPC21. This metal ground 42 is only connected to the radiated spurious suppression circuit 41 and is not connected to other circuits of the electronic device. The reason why the radiated spurious suppression circuit 41 is not grounded with other circuits is that the current in the radiated spurious suppression circuit 41 is the interference current excited by the PIM effect, so it needs to be isolated from other circuits to avoid interference to other circuits.

[0127] The first terminal of the first branch and the first terminal of the second branch of the radiated stray emission suppression circuit 41 are connected to the fourth electrical connection device 44, which is electrically connected to the screen metal frame 10 of the electronic device. The fourth electrical connection device 44 is located between the second device and the third device.

[0128] When the antenna is operational, the fundamental wave enters the cavity inside the electronic device. Due to the PIM effect, current generated at the electrical connection contact surface of the fourth electrical connection device 44 within the cavity is transmitted through the fourth electrical connection device 44 to the radiated spurious emission suppression circuit 41. The radiated spurious emission suppression circuit 41 dissipates energy, thereby reducing the radiated power of harmonics and suppressing radiated spurious emissions. This method eliminates the need to mount the radiated spurious emission suppression circuit on the PCB, requiring only one electrical connection device, thus reducing the number of electrical connection devices used. This antenna can be a side antenna for electronic devices.

[0129] In this embodiment, one end of the electrical connection device 44 is directly electrically connected to the screen metal frame 10, and the other end is connected to the metal ground 42 through the radiated spurious suppression circuit 41. Instead of directly connecting one end of the electrical connection device 44 to the metal middle frame 20 and the other end to the metal ground 42 through the radiated spurious suppression circuit 41, this is done because the electrical connection device 44 added to the screen metal frame 10 can also change the characteristic mode transmission characteristics of the resonant cavity formed by the screen metal frame 10 and the metal middle frame, thereby changing the resonant frequency of the cavity. This ensures that the resonant frequency of the cavity is no longer within the antenna's operating frequency band, meaning that cavity clutter no longer appears within the antenna's operating frequency band, thus guaranteeing the antenna gain. Furthermore, for the resonant cavity formed by the screen metal frame 10 and the metal middle frame 20, directly connecting one end of the electrical connection device 44 to the screen metal frame 10 is sufficient to change the resonant frequency of the cavity. The reason why this application does not choose to directly connect one end of the electrical connection device 44 to the overall metal frame 20 is that: the metal frame itself may be reused as an antenna, and in this application, the electrical connection device 44 needs to be connected to the metal ground 42 through the radiated spurious suppression circuit 41. If one end of the electrical connection device 44 is directly connected to the overall metal frame 20, the current used to excite the antenna will flow into the radiated spurious suppression circuit 41 connected to the metal ground 42, thereby affecting the antenna performance.

[0130] In addition, for Figure 9A The method shown can also be modified to some extent; for example, it can be used... Figure 9B The implementation method shown.

[0131] The middle frame 20 is divided into a first part 21 and a second part 22, and the first part 21 and the second part 22 are fixed and insulated from each other by an insulating material 23. Figure 9B 9-(2) is a top view of the middle frame 20. The first part 21 and the second part 22 are filled with insulating material 23 to achieve mutual insulation and fixation. The insulating material 23 can be insulating glue, insulating plastic or insulating rubber, or other materials. This application embodiment does not specifically limit the materials. The middle frame 20 can be made of metal, that is, the first part 21 and the second part 22 can be made of metal. In one possible implementation, a through groove can be processed on the middle frame 20 to separate the first part 21. The position of the through groove is the position of the insulating material 23.

[0132] One end of the fourth electrical connection device 44 is connected to the screen metal frame 10, and the other end is connected to the radiated spurious emission suppression circuit. The FPC 21 containing the radiated spurious emission suppression circuit is fixed to the middle frame 20 with adhesive, and the radiated spurious emission suppression circuit 41 directly uses the first part 21 of the middle frame 20 as a metal ground through the wiring of the FPC 21. This is because the middle frame itself is made of metal, and by reusing the first part of the middle frame, it is possible to avoid adding a metal ground, saving materials and reducing costs. With insulation between the first part 21 and the second part 22, even if other parts of the middle frame are reused as antennas, the current used to excite the antenna will not be affected by the radiated spurious emission suppression circuit 41 and the metal ground 42.

[0133] At this time, the second end of the first branch and the second end of the second branch of the radiated spurious emission suppression circuit can be fixed to the first part 21 of the middle frame 20 by conductive adhesive, or by means of limiting structure, elastic connection, welding, etc. The reason for insulating the first part 21 or the second part 22 of the middle frame 20 is that the second part of the middle frame 20 may be connected to other circuits. When the first part of the middle frame 20 is used as the metal ground of the radiated spurious emission suppression circuit, it is necessary to isolate the metal ground from other circuits in order to avoid interference with other circuits.

[0134] The above embodiments illustrate how to implement a radiated spurious suppression circuit on the mid-frame. The following describes how to implement a radiated spurious suppression circuit on the PCB of an electronic device.

[0135] See Figure 10 The figure is a schematic diagram of another electronic device including a radiated stray emission suppression circuit provided in an embodiment of this application.

[0136] Figure 10 10-(1) is a side view of the electronic device. For further explanation of the distribution of the screen metal frame 10, the metal middle frame 20, and the PCB 30, please refer to... Figure 1A The corresponding explanations will not be repeated here.

[0137] The radiated stray emission suppression circuit 41 and the metal ground 42 are located on the printed circuit board (PCB) 40 of the electronic device, and the second end of the first branch and the second end of the second branch are connected to the metal ground 42 on the PCB 40.

[0138] In this embodiment, the metal ground 42 can be a metal block, metal sheet, or metal plate separately disposed on the PCB 40. That is, the metal ground 42 is only connected to the radiated spurious suppression circuit 41 and will not be connected to other circuits of the electronic device. In this embodiment, the reason why the radiated spurious suppression circuit 41 does not share a common ground with other circuits is that the current in the radiated spurious suppression circuit 41 is the interference current excited by the PIM effect, so it needs to be isolated from other circuits to avoid interference to other circuits.

[0139] The mid-frame 20 of the electronic device includes a first part 21 and a second part 22. An insulating material 23 is filled between the first part 21 and the second part 22 to achieve mutual insulation and fixation. The insulating material 23 can be insulating adhesive, insulating plastic, or insulating rubber, or other materials; this application embodiment does not specifically limit its application. The mid-frame 20 can be made of metal, meaning that both the first part 21 and the second part 22 can be made of metal. In one possible implementation, a through-groove can be machined into the mid-frame 20 to separate the first part 21; the through-groove is located where the insulating material 23 is situated.

[0140] Figure 10 10-(2) in the figure is a top view of the middle frame 20 of the electronic device. The specific shape of the first part 21 is not limited in the embodiments of this application. The thickness of the insulating material 23 between the first part 21 and the second part 22 is not limited.

[0141] The first end of the first branch and the first end of the second branch are connected to the first part 21 of the middle frame 20 of the electronic device through the first electrical connection device 31. The first part 21 of the middle frame 20 is insulated from the rest of the middle frame 20. The first part 21 of the middle frame 20 is connected to the screen metal frame 10 of the electronic device through the second electrical connection device 32. The first part 21 of the middle frame 20 is made of a metallic conductive material.

[0142] The first part 21 is mainly used to connect the first electrical connection device 31 and the second electrical connection device 32, thus forming a circuit. For example... Figure 10 As shown in 10-(2), the cross-sectional area of ​​the first part 21 in the top view should be relatively small: this is because when current flows through the first part 21, the energy is relatively concentrated, and reducing the area of ​​the first part 21 can reduce the resonant energy of the cavity formed between the first part 21 and the screen metal frame 10; in addition, reducing the area of ​​the first part 21 can also reduce the impact on the structural stability of the metal frame 20. In practical applications, the area of ​​the first part 21 can be determined according to the specific type of electrical connection device, and this application embodiment does not make specific limitations. For example, in Figure 10In the top view shown in 10-(2), the projected area of ​​the first electrical connection device 31 and the second electrical connection device 32 on the metal frame 20 is the first area, and the area of ​​the first part 21 can be less than or equal to the first area.

[0143] Based on the description in the above embodiments, the radiated spurious emission suppression circuit has a significant suppression effect on RSE. When the antenna is working, after the fundamental wave of the antenna enters the cavity inside the electronic device, the current generated by the PIM effect at the electrical connection contact surface of the first electrical connection device 31 and the second electrical connection device 32 in the cavity is transmitted to the radiated spurious emission suppression circuit through the conductive path formed by the electrical connection device 31, the electrical connection device 32 and the first part 21. The radiated spurious emission suppression circuit realizes energy loss, thereby reducing the radiated power of harmonics and thus suppressing radiated spurious emissions.

[0144] The addition of a second electrical connection device 32 to the screen metal frame 10, and the through-slots filled with insulating material 23 on the metal middle frame 20, can alter the characteristic mode transmission characteristics of the resonant cavity formed by the screen metal frame 10 and the metal middle frame 20, thereby changing the cavity's resonant frequency. This ensures that the cavity's resonant frequency is no longer within the antenna's operating frequency band, meaning that cavity clutter no longer appears within the antenna's operating frequency band, thus guaranteeing the antenna's gain. This antenna can be a side antenna for electronic devices.

[0145] It is understood that the shapes of the first electrical connection device 31 and the second electrical connection device 32 in the attached drawings are only for the convenience of drawing and do not constitute a limitation on the technical solution of this application. That is, the electrical connection device is not limited to adopting a columnar structure, and can also be other structures such as metal springs, conductive foam, and metal screws.

[0146] The following describes another implementation method.

[0147] See Figure 11 The figure is a schematic diagram of another electronic device including a radiated stray emission suppression circuit provided in an embodiment of this application.

[0148] Figure 11 11-(1) in the figure is a side view of the electronic device. Figure 11 11-(2) is a top view of the middle frame 20 of the electronic device.

[0149] In this implementation, the mid-frame 20 of the electronic device includes a through-hole 22. One end of the third electrical connector 33 is connected to the screen metal frame 10 of the electronic device, and the other end is connected to the first end of the first branch and the first end of the second branch. The third electrical connector 33 passes through the through-hole 22 but is not connected to the mid-frame 20. The opening area of ​​the through-hole 22 is larger than the cross-sectional area of ​​the third electrical connector 33 in the plane of the mid-frame 20, so that the third electrical connector 33 is not connected to the mid-frame 20 when passing through it.

[0150] In one possible implementation, insulating material can be filled into the gap of the through hole 22 to achieve mutual insulation and fixation between the third electrical connection device 33 and the middle frame 20. The insulating material can be insulating glue, insulating plastic or insulating rubber, etc., thereby ensuring that the middle frame 20 will not directly contact the third electrical connection device 33 when the middle frame 20 is displaced or deformed.

[0151] The radiated spurious emission suppression circuit 41 is located on the PCB 40 of the electronic device, and the second terminal of the first branch and the second terminal of the second branch are connected to the metal ground 42 on the PCB 40. In this embodiment, the metal ground 42 can be a metal block, metal sheet, or metal plate separately disposed on the PCB 40; that is, the metal ground 42 is only connected to the radiated spurious emission suppression circuit 41 and not to other circuits of the electronic device. The reason why the radiated spurious emission suppression circuit 41 does not share a common ground with other circuits is that the current in the radiated spurious emission suppression circuit 41 is the interference current excited by the PIM effect, therefore it needs to be isolated from other circuits to avoid interference. Furthermore, only one electrical connection device is needed, resulting in a simple structure.

[0152] Based on the description in the above embodiments, the radiated spurious emission suppression circuit has a significant suppression effect on RSE. When the antenna is working, after the fundamental wave of the antenna enters the cavity inside the electronic device, the current generated by the PIM effect at the electrical connection contact surface of the third electrical connection device 33 in the cavity is transmitted to the radiated spurious emission suppression circuit 41 through the third electrical connection device 33. The radiated spurious emission suppression circuit 41 realizes energy loss, thereby reducing the radiated power of harmonics and thus suppressing radiated spurious emissions.

[0153] The third electrical connection device 33 added to the screen metal frame 10, and the through hole 22 on the metal middle frame 20, can also change the characteristic mode transmission characteristics of the resonant cavity formed by the screen metal frame 10 and the metal middle frame 20, thereby changing the resonant frequency of the cavity. This ensures that the resonant frequency of the cavity is no longer within the antenna's operating frequency band, meaning that cavity clutter no longer appears within the antenna's operating frequency band, thus guaranteeing the antenna's gain. This antenna can be a side antenna for electronic devices.

[0154] In the above embodiments, the radiated spurious emission suppression circuit and the metal ground are disposed on the same device. Alternatively, the radiated spurious emission suppression circuit and the metal ground can be disposed on different devices, for example, the radiated spurious emission suppression circuit can be disposed on the metal frame and the metal ground can be disposed on the PCB; or, the radiated spurious emission suppression circuit can be disposed on the PCB and the metal ground can be disposed on the metal frame. In this case, the radiated spurious emission suppression circuit and the metal ground can be connected by an additional metal connector.

[0155] A transient voltage suppressor (TVS) diode can also be added to the radiated stray emission suppression circuit. This can suppress RSE while also providing anti-static protection. The following is a detailed explanation with reference to the attached diagram.

[0156] First, let's explain how the radiated spurious suppression circuit is implemented when connected to an antenna.

[0157] See Figure 12 The figure is a schematic diagram of another radiation stray emission suppression circuit provided in an embodiment of this application.

[0158] Figure 12 The radiation spurious suppression circuit in the circuit includes a first branch B1 and a second branch B2.

[0159] The first branch B1 includes an inductor L, and the second branch L2 includes a capacitor C.

[0160] A resistor may or may not be included in a radiated stray emission suppression circuit. Figure 12 The diagram only illustrates how to implement the setting of a resistor.

[0161] The resistor can be set in the first branch B1 and / or the second branch B2.

[0162] Specifically, for Figure 12 In 12-(1), resistor R1 is set on the first branch B1, the first end of R1 is connected to the inductor, and the second end is grounded; for Figure 12 In section 12-(2), resistor R2 is placed on the second branch B2, with the first end of R2 connected to a capacitor and the second end grounded; for Figure 12 In 12-(3), resistor R1 is set on the first branch B1, the first end of R1 is connected to an inductor and the second end is grounded, and resistor R2 is set on the second branch B2, the first end of R2 is connected to a capacitor and the second end is grounded.

[0163] The second terminal of the first branch B1 and the second terminal of the second branch B2 are connected to the metal ground via a TVS. The TVS is used to implement electrostatic discharge (ESD) protection; when ESD occurs, the TVS conducts, clamping the voltage in the RF path and thus providing protection.

[0164] Furthermore, the metal ground can be a separately set metal block, metal sheet, or metal plate. That is, the metal ground is only connected to the radiation stray emission suppression circuit and will not be connected to other circuits of the electronic device to avoid interference with other circuits.

[0165] The following explanation is based on specific simulation results.

[0166] See Figure 13This figure is a simulation diagram of the antenna radiation efficiency provided in an embodiment of this application. Figure 3 .

[0167] Figure 13 Curve 9-1 in the figure shows the radiation efficiency curve at the PIM position of the excitation RF path when no radiation spurious suppression circuit is set.

[0168] Figure 13 Curve 9-2 in the figure shows the radiation efficiency curve at the PIM position when the radiated spurious suppression circuit is set up and the excitation RF path is at the PIM position. The inductance of the radiated spurious suppression circuit corresponding to curve 9-2 is 0.7nH, the capacitance is 1.7pF, and no resistor is set in the radiated spurious suppression circuit.

[0169] Figure 13 Curve 9-3 in the diagram also shows the radiation efficiency curve at the PIM position of the excitation RF path when a radiated spurious suppression circuit is set up. The inductance of the radiated spurious suppression circuit corresponding to curve 9-3 is 0.7nH, the capacitance is 1.7pF, and a resistor is included in the radiated spurious suppression circuit. The resistor connection method is as follows: Figure 12 In section 12-(2), the resistance value is 10 ohms. It can be found that the maximum decrease in radiation efficiency in curve 9-3 can reach about 10dB. Furthermore, by setting the resistance, the suppression bandwidth for radiated spurious emissions is broadened, meaning that the radiated spurious emissions suppression circuit has a higher suppression effect over a wider bandwidth.

[0170] Figure 13 The difference between the radiated spurious emission suppression circuit corresponding to curve 9-4 and curve 9-3 is that the resistance value is increased. At this point, it is found that the maximum decrease in radiation efficiency in curve 9-4 further increases, reaching approximately 11 dB. Furthermore, the suppression bandwidth for radiated spurious emissions is further broadened.

[0171] See Figure 14 This figure is a simulation diagram of the antenna radiation efficiency provided in an embodiment of this application. Figure 4 .

[0172] Figure 14 Curve 10-1 in the figure shows the radiation efficiency curve at the PIM position of the excitation RF path when no radiation spurious suppression circuit is set.

[0173] Figure 14 Curve 10-2 in the figure shows the radiation efficiency curve at the PIM position when the radiated spurious suppression circuit is set up and the excitation RF path is at the PIM position. The inductance of the radiated spurious suppression circuit corresponding to curve 10-2 is 0.7nH, the capacitance is 1.7pF, and no resistor is set in the radiated spurious suppression circuit.

[0174] Figure 14 Curve 10-3 in the figure also shows the radiation efficiency curve at the PIM position of the excitation RF path when a radiated spurious suppression circuit is set up. The inductance of the radiated spurious suppression circuit corresponding to curve 10-3 is 0.7nH, the capacitance is 1.7pF, and a resistor is included in the radiated spurious suppression circuit. The resistor connection method is as follows: Figure 12 In section 12-(2), the resistance value is 25 ohms. It can be found that the maximum decrease in radiation efficiency in curve 10-3 can reach about 10dB. Furthermore, by setting the resistance, the suppression bandwidth for radiated spurious emissions is broadened, meaning that the radiated spurious emissions suppression circuit has a higher suppression effect over a wider bandwidth.

[0175] Figure 14 The difference between the radiated spurious emission suppression circuit corresponding to curve 10-4 and curve 10-3 is that resistors are set in both the first and second branches of the radiated spurious emission suppression circuit. The resistors are connected as follows: Figure 12 In 12-(3), it was found that the maximum decrease in radiation efficiency in curve 10-4 further increased to about 15dB, and the bandwidth for suppressing radiative stray radiation was further broadened.

[0176] In summary, the radiated spurious emission suppression circuit provided in this application has high loss performance for RSE. When the antenna fundamental wave generates harmonics at the electrical connection contact surface of the electrical connection device, the radiated spurious emission suppression circuit can achieve harmonic energy loss, thereby suppressing radiated spurious emissions caused by electrostatic discharge. The radiated spurious emission suppression circuit can also be equipped with a TVS with anti-static function to achieve relay protection. This TVS can be regarded as a nonlinear electrical connection device, which will generate RSE during electrostatic discharge. The radiated spurious emission suppression circuit of this application can also reduce the radiated spurious emissions caused by electrostatic discharge in the TVS.

[0177] The following describes other application scenarios of this radiated stray emission suppression circuit.

[0178] See Figure 15 This figure is a schematic diagram of a scenario provided by an embodiment of this application. Figure 2 .

[0179] When an electronic device has a camera module, electrostatic discharge can cause interference to the camera, as explained below.

[0180] Electronic devices typically have a decorative structure (DECO) 100 on the outside of the camera lens (Lens) 101.

[0181] An optical image of an object is generated by the lens 101 and projected onto the photosensitive element (sensor) 103.

[0182] The photosensitive element 103 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor.

[0183] The photosensitive element 103 converts the light signal into an electrical signal, and then the electrical signal is transmitted through the flexible circuit board 104 to the image signal processor (ISP) 107 to be converted into a digital image signal.

[0184] One end of the flexible circuit board 104 is connected to the electrical signal output by the photosensitive element 103, and the other end is connected to the board-to-board (B2B or BTB) connector 105 on the PCB 108.

[0185] PCB108 can be connected to the middle frame 109.

[0186] However, when static electricity enters the camera module from DECO10, it generates common-mode current. This common-mode current travels along the flexible circuit board 104 to PCB108, affecting the normal operation of ISP107 and potentially other circuit components. The common-mode current flow path can be found in [reference needed]. Figure 15 Line ① in the circuit. The common-mode current is alternating current, which can cause the electronic equipment to generate a large interference voltage. Furthermore, the board-to-board connection device 105 can be considered a nonlinear device, and the interference voltage may cause the board-to-board connection device 105 to generate RES.

[0187] The radiated stray emission suppression circuit in this embodiment not only has the effect of suppressing radiated stray emissions, but also reduces the impact of common-mode current generated by electrostatic discharge on the circuit.

[0188] The first end of the first branch and the first end of the second branch of the radiated stray emission suppression circuit 130 are connected to the output of the camera module, that is, connected between the BTB connector 105 and the ISP 107.

[0189] The metal ground 131 connected to the second end of the first branch and the second end of the second branch of the radiated spurious suppression circuit 130 can be a metal block, metal sheet or metal plate set separately on the PCB. That is, the metal ground is only connected to the radiated spurious suppression circuit and will not be connected to other circuits of the electronic device to avoid interference to other circuits.

[0190] The implementation of the radiated stray emission suppression circuit 130 can be found in [reference needed]. Figure 12Any one of the following. When electrostatic discharge occurs, the TVS in the radiated spurious emission suppression circuit 130 is turned on, clamping the voltage and thus achieving the protection function. Furthermore, since the radiated spurious emission suppression circuit 130 includes inductors and resistors, it exhibits both inductive and resistive characteristics. The superposition of these characteristics gives the radiated spurious emission suppression circuit 130 a choking effect. When common-mode current caused by electrostatic discharge exists, the radiated spurious emission suppression circuit 130 utilizes the heat dissipation generated by the high-frequency common-mode current to suppress it, thereby reducing interference from the common-mode current. Therefore, this radiated spurious emission suppression circuit 130 can achieve loss of specific high-frequency noise without affecting the transmission of related signals from the camera module. In addition, board-to-board connectors and TVS can be considered as non-linear electrical connection devices, generating RSE during electrostatic discharge. The radiated spurious emission suppression circuit 130 of this application can also reduce the radiated spurious emissions from board-to-board connectors and TVS caused by electrostatic discharge.

[0191] The following explains the principle of radiated stray emission suppression circuits when applied to fingerprint recognition scenarios.

[0192] See also Figure 16 and Figure 17 .in, Figure 16 A scenario illustration provided for an embodiment of this application. Figure 3 ; Figure 17 Provided for the embodiments of this application Figure 16 The corresponding side view.

[0193] Electronic devices that support fingerprint unlocking, such as Figure 16 As shown in 16-(1), there is a fingerprint unlocking area on the screen. When the user presses the area with their finger, the fingerprint sensor uses the characteristics of the collected fingerprint to unlock the fingerprint.

[0194] like Figure 16 As shown in 16-(2) in the paper, the fingerprint sensor 201 can be an optical fingerprint sensor, an ultrasonic sensor, a semiconductor capacitive sensor, etc., and this application does not make any specific limitation.

[0195] The fingerprint sensor 201 is placed close to the screen 200. At this time, the fingerprint sensor 201 outputs the collected data to the application processor (AP) 204 on the PCB 205 via the FPC 203. One end of the flexible circuit board 203 is connected to the fingerprint sensor 201, and the other end is connected to the BTB connector 206 on the PCB 25.

[0196] During electrostatic discharge, the generated common-mode current travels from FPC203 to PCB205, affecting the normal operation of AP204 and potentially other circuit components. The common-mode current flow path can be found in [reference needed]. Figure 17 Line ② in the middle.

[0197] The radiated spurious emission suppression circuit in this embodiment not only suppresses radiated spurious emissions but also reduces the impact of common-mode current generated by electrostatic discharge on the circuit. The first terminal of the first branch and the first terminal of the second branch of the radiated spurious emission suppression circuit 130 can be connected to an electrical connection device. Furthermore, the first terminal of the first branch and the first terminal of the second branch can also be connected to a fingerprint recognition circuit, i.e., connected between the BTB connector 206 and AP204.

[0198] The metal ground 131 connected to the second end of the first branch and the second end of the second branch of the radiated spurious suppression circuit 130 can be a metal block, metal sheet or metal plate set separately on the PCB. That is, the metal ground is only connected to the radiated spurious suppression circuit and will not be connected to other circuits of the electronic device to avoid interference to other circuits.

[0199] The implementation of the radiated stray emission suppression circuit 130 can be found in [reference needed]. Figure 12 Any one of the following. When electrostatic discharge occurs, the TVS in the radiated spurious emission suppression circuit 130 is turned on, clamping the voltage and thus achieving the protection function. Furthermore, since the radiated spurious emission suppression circuit 130 includes inductors and resistors, it exhibits both inductive and resistive characteristics. The superposition of these characteristics gives the radiated spurious emission suppression circuit 130 a choking effect, thereby reducing interference from common-mode current. Therefore, this radiated spurious emission suppression circuit 130 can achieve loss of specific high-frequency noise without affecting the fingerprint recognition signal transmission. In addition, board-to-board connectors and TVS can be considered non-linear electrical connection devices, generating RSE during electrostatic discharge. The radiated spurious emission suppression circuit of this application can also reduce the radiated spurious emissions from board-to-board connectors and TVS caused by electrostatic discharge.

[0200] Based on the radiated spurious emission suppression circuits provided in the above embodiments, this application also provides a radiated spurious emission suppression component, which includes a radiated spurious emission suppression circuit, one or more first devices, second devices, and third devices. The radiated spurious emission suppression circuit includes a first branch and a second branch connected in parallel. The first branch includes an inductor, and the second branch includes a capacitor. The first terminals of the first and second branches are connected to the same first device, and the second terminals of the first and second branches are grounded. The first device is an electrical connection device, which is electrically connected to the second device and located between the second and third devices. The radiated spurious emission suppression circuit is used to reduce the relative segregation (RSE) generated by the first device.

[0201] The specific working principle and implementation method of the radiated stray emission suppression circuit can be found in the description of the above embodiments, and will not be repeated here.

[0202] In one possible implementation, the second device is the screen metal frame of the electronic device, and the third device is the middle frame of the electronic device.

[0203] In one possible implementation, the radiated spurious suppression component specifically includes a first electrical connection device, a mid-frame including an FPC, a radiated spurious suppression circuit located on the FPC, and a second terminal of the first branch and a second terminal of the second branch grounded on the FPC, the FPC being fixed to the mid-frame. The first terminal of the first branch and the first terminal of the second branch are connected to the screen metal frame via the first electrical connection device.

[0204] In one possible implementation, the radiated spurious suppression component specifically includes a first electrical connection device, and the mid-frame includes an FPC. The radiated spurious suppression circuit is located on the FPC, and the second terminal of the first branch and the second terminal of the second branch are connected to a first portion of the mid-frame. The first portion of the mid-frame is insulated from the rest of the mid-frame, and the FPC is fixed to the mid-frame. The first terminal of the first branch and the first terminal of the second branch are connected to the screen metal frame via the first electrical connection device.

[0205] In one possible implementation, the second device is the screen metal frame of the electronic device, and the third device is the printed circuit board (PCB) of the electronic device.

[0206] In one possible implementation, the radiated spurious suppression component specifically includes a first electrical connection device and a second electrical connection device, and the radiated spurious suppression component also includes a middle frame; the second end of the first branch and the second end of the second branch are grounded on the PCB; the first end of the first branch and the first end of the second branch are connected to the first part of the middle frame through the first electrical connection device, the first part of the middle frame is insulated from the rest of the middle frame, and the first part of the middle frame is connected to the screen metal frame through the second electrical connection device.

[0207] In one possible implementation, the radiated spurious emission suppression component specifically includes a first electrical connection device, and also includes a mid-frame. A second terminal of the first branch and a second terminal of the second branch are grounded on the PCB. The mid-frame includes a through-hole, and the first terminal of the first branch and the first terminal of the second branch are connected to the screen metal frame via the first electrical connection device, which is insulated from the mid-frame through the through-hole. In this implementation, the mid-frame may also be considered part of the electronic device to which the radiated spurious emission suppression component is applied, rather than as part of the radiated spurious emission suppression component.

[0208] In one possible implementation, the resonant frequencies of the capacitor and inductor are integer multiples of the center frequency of the antenna of the electronic device.

[0209] In one possible implementation, the first branch and / or the second branch also include resistors.

[0210] Based on the radiation spurious suppression circuit provided in the above embodiments, this application also provides an electronic device, which will be described in detail below with reference to the accompanying drawings.

[0211] See Figure 18 This figure is a schematic diagram of another electronic device provided in an embodiment of this application.

[0212] The electronic device may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, a headphone jack 170D, a sensor module 180, buttons 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc.

[0213] It is understood that the structures illustrated in the embodiments of the present invention do not constitute a specific limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0214] The wireless communication function of electronic device 100 can be realized through antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, modem processor and baseband processor, etc.

[0215] Mobile communication module 150 can provide wireless communication solutions including 2G / 3G / 4G / 5G for use in electronic device 100. Wireless communication module 160 can provide wireless communication solutions including wireless local area networks (WLAN) (such as Wi-Fi networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) technologies for use in electronic device 100.

[0216] Electronic devices may include one or more radiated spurious emission suppression circuits. Each radiated spurious emission suppression circuit includes a first branch and a second branch connected in parallel. The first branch includes an inductor, and the second branch includes a capacitor. The first terminal of the first branch and the first terminal of the second branch can be connected to electrical connection devices that are prone to generating harmonics due to the PIM effect, or to circuits or devices that are prone to electrostatic discharge, such as antennas, electrical connection devices, fingerprint recognition circuits, and the output terminals of camera modules. The second terminals of the first and second branches are grounded. For a detailed explanation of the specific working principle of the radiated spurious emission suppression circuit, please refer to the above embodiments, which will not be repeated here.

[0217] When the radiated spurious suppression circuit is connected between ground and electrical connection devices, it can suppress harmonics excited by the fundamental wave of the antenna. This antenna can be a side antenna for electronic devices. Figure 18 The diagram illustrates one implementation of a radiated spurious emission suppression circuit. In this implementation, the electrical connector 30 can be a metal spring, with one end connected to the screen metal frame 10 and the other end connected to the radiated spurious emission suppression circuit. The electrical connector 30 is used to suppress cavity resonance between the metal frame and the screen metal frame 10.

[0218] The electronic device provided in this application improves the suppression effect of radiated spurious emissions (RSE) by setting a radiated spurious emission suppression circuit. When the antenna is working, after the fundamental wave of the antenna enters the cavity inside the electronic device, the current generated at the electrical connection contact surface of the electrical connection device in the cavity due to the PIM effect is transmitted to the radiated spurious emission suppression circuit. The radiated spurious emission suppression circuit realizes energy loss, thereby reducing the radiated power of harmonics and thus suppressing radiated spurious emissions.

[0219] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0220] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An electronic device, characterized in that, The electronic device includes: a radiated stray emission suppression circuit and one or more first devices; The radiated stray emission suppression circuit includes a first branch and a second branch connected in parallel. The first branch includes an inductor, and the second branch includes a capacitor. The first end of the first branch and the second branch are connected to the same first device; The second terminals of the first branch and the second branch are grounded; The radiated stray emission suppression circuit is used to reduce the radiated stray emission (RSE) generated by the first device.

2. The electronic device according to claim 1, characterized in that, The resonant frequencies of the capacitor and the inductor are integer multiples of the center frequency of the antenna of the electronic device.

3. The electronic device according to claim 1, characterized in that, The first device is an electrical connection device, which is made of a conductive material. The electronic device further includes a second device and a third device. The electrical connection device is electrically connected to the second device, and the electrical connection device is located between the second device and the third device.

4. The electronic device according to claim 3, characterized in that, The second device is the screen metal frame of the electronic device, and the third device is the middle frame of the electronic device.

5. The electronic device according to claim 4, characterized in that, The electronic device specifically includes a first electrical connection device, and the middle frame includes a flexible circuit board (FPC). The radiated stray emission suppression circuit is located on the FPC, and the second end of the first branch and the second end of the second branch are grounded on the FPC, which is fixed to the middle frame; The first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device.

6. The electronic device according to claim 4, characterized in that, The electronic device specifically includes a first electrical connection device, and the middle frame includes a flexible circuit board (FPC). The radiated stray emission suppression circuit is located on the FPC, and the second end of the first branch and the second end of the second branch are connected to the first part of the middle frame. The first part of the middle frame is insulated from the rest of the middle frame, and the FPC is fixed to the middle frame. The first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device.

7. The electronic device according to claim 3, characterized in that, The second device is the screen metal frame of the electronic device, and the third device is the printed circuit board (PCB) of the electronic device.

8. The electronic device according to claim 7, characterized in that, The electronic device specifically includes a first electrical connection device and a second electrical connection device, and the electronic device also includes a middle frame; The second end of the first branch and the second end of the second branch are grounded on the PCB; The first end of the first branch and the first end of the second branch are connected to the first part of the middle frame through the first electrical connection device. The first part of the middle frame is insulated from the rest of the middle frame. The first part of the middle frame is connected to the screen metal frame through the second electrical connection device.

9. The electronic device according to claim 7, characterized in that, The electronic device specifically includes a first electrical connection device, and the electronic device also includes a mid-frame; The second end of the first branch and the second end of the second branch are grounded on the PCB; The middle frame includes a through hole, and the first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device. The first electrical connection device passes through the through hole and is insulated from the middle frame.

10. The electronic device according to claim 1, characterized in that, The electronic device also includes a transient voltage suppressor diode (TVS), and the second terminal of the first branch and the second terminal of the second branch are grounded through the TVS.

11. The electronic device according to claim 10, characterized in that, The first device is an antenna, or the first device is a fingerprint recognition circuit, or the first device is a camera module.

12. The electronic device according to any one of claims 1-9, characterized in that, The electrical connection device is one of the following: Metal springs, conductive foam, and metal screws.

13. The electronic device according to any one of claims 1-12, characterized in that, The first branch and / or the second branch also include a resistor.

14. A radiation stray emission suppression component, characterized in that, include: A radiated stray emission suppression circuit, and one or more first devices, second devices, and third devices; The radiated stray emission suppression circuit includes a first branch and a second branch connected in parallel. The first branch includes an inductor, and the second branch includes a capacitor. The first end of the first branch and the second branch are connected to the same first device; The second terminals of the first branch and the second branch are grounded; The first device is an electrical connection device, which is electrically connected to the second device and is located between the second device and the third device; The radiated stray emission suppression circuit is used to reduce the radiated stray emission (RSE) generated by the first device.

15. The radiation stray emission suppression component according to claim 14, characterized in that, The second device is the screen metal frame of the electronic device, and the third device is the middle frame of the electronic device.

16. The radiation stray emission suppression component according to claim 15, characterized in that, The radiation stray emission suppression component specifically includes a first electrical connection device, and the middle frame includes a flexible circuit board (FPC). The radiated stray emission suppression circuit is located on the FPC, and the second end of the first branch and the second end of the second branch are grounded on the FPC, which is fixed to the middle frame; The first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device.

17. The radiation stray emission suppression component according to claim 15, characterized in that, The radiation stray emission suppression component specifically includes a first electrical connection device, and the middle frame includes a flexible circuit board (FPC). The radiated stray emission suppression circuit is located on the FPC, and the second end of the first branch and the second end of the second branch are connected to the first part of the middle frame. The first part of the middle frame is insulated from the rest of the middle frame, and the FPC is fixed to the middle frame. The first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device.

18. The radiation stray emission suppression component according to claim 14, characterized in that, The second device is the screen metal frame of the electronic device, and the third device is the printed circuit board (PCB) of the electronic device.

19. The radiation stray emission suppression component according to claim 18, characterized in that, The radiation spurious suppression component specifically includes a first electrical connection device and a second electrical connection device, and the radiation spurious suppression component also includes a middle frame; The second end of the first branch and the second end of the second branch are grounded on the PCB; The first end of the first branch and the first end of the second branch are connected to the first part of the middle frame through the first electrical connection device. The first part of the middle frame is insulated from the rest of the middle frame. The first part of the middle frame is connected to the screen metal frame through the second electrical connection device.

20. The radiation stray emission suppression component according to claim 18, characterized in that, The radiated stray emission suppression component specifically includes a first electrical connection device, and the radiated stray emission suppression component also includes a middle frame; The second end of the first branch and the second end of the second branch are grounded on the PCB; The middle frame includes a through hole, and the first end of the first branch and the first end of the second branch are connected to the screen metal frame through the first electrical connection device. The first electrical connection device passes through the through hole and is insulated from the middle frame.

21. The radiation stray emission suppression assembly according to claims 14-20, characterized in that, The resonant frequencies of the capacitor and the inductor are integer multiples of the center frequency of the antenna operating frequency of the electronic device.

22. The radiation stray emission suppression assembly according to claims 14-21, characterized in that, The electrical connection device is one of the following: Metal springs, conductive foam, and metal screws.

23. The radiation stray emission suppression component according to claims 14-22, characterized in that, The first branch and / or the second branch also include a resistor.

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