CN113346239A

CN113346239A - Electronic device and communication system

Info

Publication number: CN113346239A
Application number: CN202110469347.0A
Authority: CN
Inventors: 殷明; 时龙飞; 陈嘉琪; 杨婧; 高琦; 司珂瑜
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-09-03
Anticipated expiration: 2041-04-28
Also published as: CN113346239B; WO2022227735A1

Abstract

The embodiment of the application provides electronic equipment and a communication system. The electronic equipment can enable the noise suppression plate to suppress the noise electromagnetic waves radiated by the mainboard towards the antenna direction through the frequency selection surface by arranging the noise suppression plate between the mainboard and the antenna, so that the influence of the noise electromagnetic waves on the process of receiving and transmitting signals by the antenna is reduced. The noise suppression plate can suppress the passing of noise electromagnetic waves through a frequency selection surface formed by the metal part and the dielectric part, improves the sensitivity of the antenna, can obtain a good noise suppression effect through a small plate surface area, and reduces the occupation of the internal space of the electronic equipment.

Description

Electronic device and communication system

Technical Field

The present application relates to the field of communications technologies, and in particular, to an electronic device and a communication system.

Background

The electronic equipment mainboard with the communication function is provided with various communication elements such as high-speed signal lines, chips and the like. These communication elements radiate noise signals outward during operation, which affects the reception sensitivity of a wireless local area network (WiFi) antenna or a bluetooth antenna on the electronic device.

For example, a VBO (v-by-one) signal line on a motherboard radiates a noise signal with a frequency of 2.4GHz outwards during signal transmission. Such noise signals have the same transmission frequency as the WiFi antenna and the bluetooth antenna, and affect the reception sensitivity of the WiFi antenna and the bluetooth antenna. And when the top of mainboard chip was equipped with the metal fin, this noise signal can form the complete machine radiation through the metal fin, when near noise signal radiated antenna mouth, can show the sensitivity that reduces wiFi antenna and bluetooth antenna.

In order to suppress the common mode noise, a noise suppression component such as a shield can may be provided above or around the electric element that can generate noise. The noise suppression component can receive the noise signal radiated by the electric element and dredge the received common mode noise signal to the grounding component, so that the noise signal radiated to the antenna is reduced. However, since a plurality of electrical components are usually present on the main board of the electronic device, the suppression component needs to cover each electrical component capable of generating a noise signal, or cover the whole main board, so as to effectively suppress the noise signal radiated to the antenna, which results in a larger volume of the noise suppression component and occupies a large amount of internal space of the electronic device.

Disclosure of Invention

The application provides an electronic device and a communication system, which can inhibit noise signals in the electronic device from radiating to an antenna port and reduce the occupation of the internal space of the electronic device.

In a first aspect, an embodiment of the present application provides an electronic device, including: mounting board, mainboard, antenna and noise suppression board. The mainboard is provided with electric elements such as chips and the like for processing data and signals. The electric elements on the main board can also generate electromagnetic waves in the operation process, and the generated electromagnetic waves can radiate outwards by taking the elements or the main board as the center to form noise electromagnetic waves. The antenna is used for transceiving electromagnetic wave signals, namely sensing electromagnetic waves in the environment so as to receive the signals. The antenna is also used for radiating electromagnetic wave signals outwards to transmit the signals.

The main board, the antenna and the noise suppression board are all arranged on the mounting board, namely the mounting board is used for bearing the main board, the antenna, the noise suppression board and other functional components. The noise suppression plate is positioned between the main board and the antenna and used for suppressing noise electromagnetic wave radiation generated on the main board to the position of the antenna and improving the sensitivity of the antenna.

The noise suppression plate includes a dielectric portion and a metal portion, and the dielectric portion and the metal portion may be made of materials having different conductive properties. That is, the dielectric part may be made of non-metal or other insulating material, and the metal part may be made of metal or other conductive material. By combining the dielectric part and the metal part in a specific shape and arranging the positions, a frequency selective surface can be formed on the noise suppressing plate. When a noise electromagnetic wave is incident to the frequency selective surface, electrons of the metal part may oscillate by an electric field force, thereby generating an induced current in the metal part. Depending on the position and shape of the arrangement, a certain form of parasitic inductance and/or parasitic capacitance may be generated on the frequency selective surface, so that the frequency selective surface has a certain resonance frequency.

When the noise electromagnetic wave with the resonant frequency is incident, most energy in the noise electromagnetic wave is converted into induced current, and the induced current forms a radiation field again, which is equivalent to reflecting the noise electromagnetic wave back to prevent the noise electromagnetic wave from radiating to the antenna. Namely, a band-stop filtering structure can be formed between the mainboard and the antenna by arranging the noise suppression plate between the mainboard and the antenna, so that the frequency selection surface can suppress noise electromagnetic waves radiated from the mainboard to the antenna, the interference of noise electromagnetic wave signals to the receiving and transmitting processes of antenna signals is reduced, and the sensitivity of the antenna is improved. In addition, because the noise suppression plate occupies a smaller space than noise suppression components such as the shielding case, the noise suppression plate can reduce the occupation of the internal space of the electronic equipment by suppressing the noise signals, which is beneficial to the layout design of other electrical elements in the electronic equipment.

Optionally, the metal part is embedded in the dielectric part in a C-shape to form a frequency selective surface. The noise suppression plate can be formed into a substrate through the medium part, and then formed into a C-shaped metal branch on the medium part through the metal part to form a frequency selection surface. The metal part of the C-shaped structure can induce current when electromagnetic waves enter, and parasitic capacitance is generated on the noise suppression plate, particularly at the opening of the C-shaped structure, so that the energy of the noise electromagnetic waves is consumed, a radiation field is formed, and the noise electromagnetic waves are prevented from passing through.

Optionally, a plurality of metal parts are arranged in the medium part, the plurality of metal parts may be arranged on the medium part according to a specific arrangement manner, and each metal part is a rectangular frame structure with an opening at one end. The C-shaped metal branch of the open rectangular frame structure can form a capacitance structure at the opening and simultaneously form a capacitance structure between adjacent metal parts, thereby being beneficial to generating parasitic capacitance on the frequency selection surface, being capable of consuming more energy in electromagnetic waves and improving the noise suppression effect.

Optionally, the medium part is provided with two metal parts, and the two metal parts are nested with each other by taking a fixed point on the medium part as a center; the rectangular frames of the two metal parts have opposite opening directions. That is, two C-shaped metal parts may be provided in the medium part, one of the metal parts being provided in the outer ring and the other metal part being provided in a range surrounded by the outer ring metal part, that is, in the inner ring. Through the two C-shaped metal parts which are mutually nested, the facing area between the metal parts can be increased, larger parasitic capacitance is generated, and the noise suppression effect is improved. In addition, the electromagnetic induction effect at the opening can be improved, and the suppression effect of the balance at each position is formed.

Optionally, the opening width of the rectangular frame of the metal part is 4-5mm, the side length of the rectangular frame of the metal part positioned on the outer ring is 35-45mm, the side length of the rectangular frame of the metal part positioned on the inner ring is 15-25mm, and the width of the rectangular frame of the metal part is 0.1-1 mm. Accordingly, a rectangular dielectric part having a side length of 40mm or more can be used, and the dielectric constant of the dielectric part is 3.4 to 3.6. Through the metal part that sets up above-mentioned shape, can realize effectively suppressing 2.4 GHz's noise electromagnetic wave, alleviate the noise electromagnetic wave to the influence that causes of wiFi antenna and/or bluetooth antenna, improve the sensitivity of wiFi antenna and/or bluetooth antenna.

Alternatively, the positions of the metal part and the dielectric part may be interchanged. That is, the noise suppressing plate may be formed by forming the metal part into a substrate structure, and then providing the medium part in a C-shaped structure and fitting it into the metal part. By interchanging the metal part and the dielectric part, different forms of frequency selective surfaces can be formed, and different parasitic capacitances or parasitic inductances are generated, thereby suppressing noise electromagnetic waves of different frequencies.

Optionally, the metal part is embedded in the dielectric part in a cross shape; alternatively, the metal part is embedded in the medium part in an I shape. Besides the metal part of the C-shaped structure, the metal part can be set to be of a cross-shaped structure or an I-shaped structure. Different structures may correspond to different frequency selective surfaces, as well as creating parasitic capacitance and parasitic inductance. Therefore, the resonance frequency of the frequency selective surface can be adjusted by the metal parts of different shapes, thereby suppressing the noise electromagnetic waves of different frequencies. Similarly, on the basis of the cross-shaped structure and the I-shaped structure, the positions of the metal part and the medium part can be interchanged. That is, in order to suppress noise electromagnetic waves of different frequencies, the dielectric portion may be disposed in a cross shape embedded in the metal portion, or the dielectric portion may be disposed in an i-shape embedded in the metal portion to form a frequency selective surface.

Optionally, the noise suppression plate comprises a plurality of metal portions and/or a plurality of dielectric portions. The plurality of metal parts and/or the plurality of medium parts are one or more of C-shaped structures, cross-shaped structures and I-shaped structures. That is, a plurality of metal parts or dielectric parts of the same shape or different shapes may be provided on the noise suppressing plate. The provision of a plurality of metal portions or dielectric portions can increase the area of the frequency selective surface and improve the noise suppression effect. On the other hand, since the metal parts or the dielectric parts of different shapes can suppress noise electromagnetic waves of different frequencies, the noise electromagnetic waves of a plurality of frequencies can be simultaneously suppressed from passing through by the noise suppression plate. In addition, the plurality of metal parts or the plurality of medium parts can be arranged, and the distance between the plurality of metal parts or the plurality of medium parts can be arranged, so that the plurality of metal parts or the plurality of medium parts can have interaction, and the effect of inhibiting the noise electromagnetic wave is improved.

Optionally, the noise suppression plate is disposed at an electromagnetic extreme point position between the main board and the antenna. In the operation process of operating the electronic equipment, the mainboard is provided with a plurality of electric elements which can radiate noise electromagnetic waves outwards. When the elements for radiating the noise electromagnetic waves are arranged at different positions on the main board, the electromagnetic extreme points can be formed at specific positions in space, and the energy of the noise electromagnetic waves radiated at the electromagnetic extreme point positions is larger, so that the noise suppression board can be arranged at the electromagnetic extreme point positions, more noise electromagnetic waves can be suppressed, and the noise electromagnetic waves can be prevented from being transmitted to the antenna position.

Optionally, when a plurality of electromagnetic extremum points exist between the main board and the antenna, a plurality of noise suppression boards may be further disposed between the main board and the antenna, and the plurality of noise suppression boards are respectively disposed at one or more electromagnetic extremum points, that is, one or more noise suppression boards may be respectively disposed at each electromagnetic extremum point, so that the plurality of noise suppression boards jointly suppress the noise electromagnetic waves radiated by the main board, and the noise electromagnetic waves radiated to the antenna position are reduced.

Optionally, the metal portions or the dielectric portions on the plurality of noise suppressing plates are one or a combination of C-shaped structures, cross-shaped structures, and i-shaped structures, that is, the plurality of noise suppressing plates disposed on the plurality of electromagnetic extreme points may have the same shape or different shapes. When the shapes of the plurality of noise suppression plates are the same, the noise electromagnetic waves at a plurality of positions can be suppressed, and the noise electromagnetic wave energy radiated to the antenna can be reduced. When the metal portions on the plurality of noise suppressing plates are different in shape, the noise electromagnetic waves of different frequencies can be suppressed by the different metal portions or dielectric portion shapes, and therefore a frequency selective surface for blocking the noise electromagnetic waves of a plurality of frequencies can be formed.

Optionally, a heat dissipation metal sheet is arranged on the main board. The heat dissipation metal sheet can be arranged above, below or nearby the chip and other electrical elements and is used for bearing the heat dissipation function of the chip and other electrical elements. When the heat dissipation metal sheet is arranged on the main board, noise electromagnetic waves generated by the electric elements such as the chip and the like are radiated outwards through the heat dissipation metal sheet, so that the noise suppression plate can be arranged outside the range covered by the orthographic projection of the heat dissipation metal sheet to the mounting plate to suppress the noise electromagnetic waves radiated through the heat dissipation metal sheet.

Optionally, the mounting plate is further provided with a shielding region, and the noise suppression plate is disposed within a range covered by the shielding region. The noise suppression plate is arranged in the shielding area, so that the noise suppression plate can only suppress noise electromagnetic waves radiated by the main board, and the electromagnetic waves transmitted or received by the antenna can not be suppressed. Namely, the noise suppression plate can not invade the clearance area of the antenna, and the influence of the noise suppression plate on the normal communication function of the antenna is reduced.

Optionally, the antenna of the electronic device may be a WiFi antenna or a bluetooth antenna, and may be used to receive and transmit electromagnetic waves with a frequency of 2.4GHz, and electrical elements such as signal lines and the like arranged on the motherboard, where the electrical elements may radiate common mode noise outwards when transmitting signals with a transmission frequency corresponding to the WiFi antenna or the bluetooth antenna, so as to influence a signal receiving and transmitting process of the antenna, and therefore, the common mode noise generated by the motherboard may be suppressed by setting a frequency selection surface shape of the noise suppression board.

In a second aspect, an embodiment of the present application further provides a communication system, which includes a sending end and a receiving end of a signal. Wherein, the sending end and the receiving end establish communication connection, and the sending end and/or the receiving end comprise the electronic device of the first aspect. Because the electronic equipment comprises the noise suppression plate and the noise electromagnetic wave radiated from the main board to the antenna position is suppressed by the noise suppression plate with smaller volume, the whole volume of the electronic equipment can be lighter and thinner, which is beneficial to simplifying the scale of a communication system and improving the signal transmission sensitivity.

Drawings

FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a noise suppressing plate structure including a C-shaped metal part according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a noise suppression plate structure including a plurality of C-shaped metal parts according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a noise suppression plate structure including a C-shaped structure medium portion according to an embodiment of the present application;

fig. 5 is a schematic diagram of a noise suppressing plate structure including a cross-shaped structural metal part in an embodiment of the present application;

FIG. 6 is a schematic diagram of a noise suppressing plate structure including a cross-shaped structural medium portion in an embodiment of the present application;

FIG. 7 is a schematic illustration of a noise suppressing plate structure including an I-shaped structural metal portion according to an embodiment of the present application;

FIG. 8 is a schematic illustration of a noise suppressing plate structure including an I-shaped structural dielectric portion according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a noise suppressing plate structure including a plurality of metal parts of different structures according to an embodiment of the present application;

FIG. 10 is a schematic view showing the arrangement position of a noise suppressing plate in the embodiment of the present application;

FIG. 11 is a graph showing the effect of noise level suppression in the embodiment of the present application;

fig. 12 is a schematic diagram of the arrangement positions of the noise suppression plates for two antennas in the embodiment of the present application;

fig. 13 is a schematic diagram of the arrangement positions of noise suppression plates for two antennas with different transmission frequencies in the embodiment of the present application;

fig. 14 is a schematic structural diagram of an electronic device with a heat dissipation metal sheet on a motherboard in an embodiment of the present application;

FIG. 15 is a schematic view of the shielded areas on the mounting board in an embodiment of the present application;

fig. 16 is a schematic structural diagram of a communication system in an embodiment of the present application.

Illustration of the drawings:

wherein, 1-a main board; 11-a chip; 12-heat dissipating metal sheets; 2-an antenna; 3-a noise suppression plate; 31-a metal portion; 32-a media section; 4-mounting a plate; 5-shielding area.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. Other embodiments based on the embodiments of the present application and obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present application.

In the embodiment of the present application, the electronic device refers to a device having a signal transceiving function and a data processing function, and includes, but is not limited to, a smart phone, a smart television, a network device, and other devices having a communication function. The electronic equipment can receive and transmit electromagnetic wave signals based on a specific communication mode, and wireless communication is achieved. For example, the electronic device may wirelessly communicate based on a wireless local area network (WiFi) transmission protocol and a bluetooth (bluetooth) transmission protocol. The electronic device can also perform processing on the received or transmitted signals through a built-in signal processing circuit and a data processing module so as to transmit specific data among a plurality of electronic devices through electromagnetic wave signals.

In order to implement the above-described communication function, the electronic device may include a communication function component and a data processing function component. The data processing function component may include a chip, a data line, and other electrical elements related to the data processing function. These electrical components can be arranged uniformly on one circuit board, i.e. the main board 1. Through a plurality of electrical components arranged on the main board 1, various functional modules capable of processing data or signals can be formed, so that signals in the main board 1 can be processed to obtain specific transmitted data or send data to be transmitted.

The communication function component may include an antenna 2, a signal line, and the like electric elements related to the communication function. The antenna 2 may be connected to the main board 1 through a signal line. The antenna 2 can be controlled to transmit and receive electromagnetic wave signals through the main board 1, so as to realize a communication function. For example, in the data transmission process, the main board 1 may convert data to be transmitted into a specific voltage signal, and transmit the voltage signal to the antenna 2, so as to radiate electromagnetic waves outwards through the oscillator structure of the antenna 2, thereby completing data transmission. For the data receiving process, the antenna 2 can receive the electromagnetic wave signal in the space, and convert the received electromagnetic wave signal into a voltage signal to be transmitted to the main board 1. And then the electrical elements related to data processing in the mainboard 1 are converted and analyzed to obtain specific data.

The antenna 2 has a broad sense, and includes not only an antenna main body structure such as a vibrator, a substrate, and a metal ground, but also a circuit structure related to signal transmission and reception. The antenna 2 also comprises, for example, a transmission line and a signal processing circuit arrangement consisting of a modem, an amplifier, an analog-to-digital converter, etc. Therefore, during communication, it is also possible to perform processing on a received or transmitted signal using the relevant circuit structure in the antenna 2 to perform radio signal transceiving in accordance with a specific transmission manner.

Different electronic devices may employ different communication modes and perform reception and transmission of electrical signals in a form suitable for the communication mode. For example, when data is transmitted using a wireless lan or a bluetooth antenna, the electrical signal transmitted from the motherboard 1 to the antenna 2 may be amplified, modulated, and the like by the signal processing circuit, and then transmitted by an electromagnetic wave having a frequency of 2.4 GHz. Similarly, when the WiFi antenna or the bluetooth antenna is used to receive data, the antenna 2 may receive an electromagnetic wave signal with a frequency of 2.4GHz, and perform processing such as reduction and demodulation on the received electromagnetic wave signal, so as to analyze a specific voltage signal from the electromagnetic wave with the frequency of 2.4GHz, and finally send the specific voltage signal to the motherboard 1, so that the motherboard 1 can analyze specific data content.

The chips, high-speed signal lines, and other electrical elements on the motherboard 1 may radiate electromagnetic waves outward during operation. When the frequency of the radiated electromagnetic wave is the same as or close to the signal transmission frequency of the antenna 2, the electromagnetic wave will interact with the electromagnetic wave signal in the normal communication process of the antenna 2, thereby affecting the transmission of the normal electromagnetic wave signal and reducing the sensitivity of the antenna 2. For example, when the electromagnetic waves radiated from the main board 1 include electromagnetic waves with a frequency of 2.4GHz, the radiated electromagnetic waves have the same frequency as the transmitting and receiving electromagnetic waves of the WiFi antenna or the bluetooth antenna, i.e., the influence of noise electromagnetic waves is generated, and the sensitivity of the WiFi antenna or the bluetooth antenna is reduced.

Therefore, in some embodiments, a noise suppression component may be provided in the electronic device to reduce the noise electromagnetic waves radiated from the main board 1 to the antenna 2. For example, a shielding case may be disposed on the motherboard 1, and the shielding case may implement electromagnetic shielding in the vicinity of the motherboard 1, so as to prevent electromagnetic waves generated on the motherboard 1 from radiating outwards. However, since the plurality of electric components on the main board 1 can radiate the electromagnetic wave, the shielding case needs to cover all the electric components capable of radiating the electromagnetic wave to achieve the suppression effect. Therefore, when the area of the main board 1 is large, the area of the shield case is also large. The large-area shielding case will occupy the space inside the electronic device seriously, which is not favorable for the lightness and thinness of the electronic device.

In order to reduce the occupation of the internal space of the electronic device, some embodiments of the present application provide an electronic device, as shown in fig. 1, the electronic device includes: a main board 1, an antenna 2, a noise suppression board 3, and a mounting board 4. Wherein, the mainboard 1 is provided with a plurality of electric elements which can radiate noise electromagnetic wave outwards. The antenna 2 is used for receiving or transmitting electromagnetic wave signals. The mounting plate 4 is used for carrying components in the electronic device, and may be a metal front shell, a metal rear shell or other metal structural members of the electronic device. The main board 1, the antenna 2 and the noise suppression board 3 are all provided on the mounting board 4.

The noise suppression board 3 serves to suppress noise electromagnetic waves radiated from the main board 1 to the antenna 2, and therefore the noise suppression board 3 may be disposed between the main board 1 and the antenna 2. The noise suppressing plate 3 includes a metal portion 31 and a dielectric portion 32. The metal part 31 is made of a conductor material. For example, the metal part 31 may be made of a metal material such as copper or aluminum, or an alloy material thereof, and the metal part 31 may be made of a material such as a non-metallic conductor or a conductive compound. The dielectric portion 32 is made of an insulator material. For example, the dielectric portion 32 may be made of an insulator material such as ceramic or plastic having a dielectric constant of 1 to 20.

The dielectric portion 32 and the metal portion 31 may form a frequency selective surface on the noise suppressing plate 3, and the frequency selective surface may induce a current and form a radiation field when a noise electromagnetic wave radiated from the main board is incident, so as to prevent the noise electromagnetic wave emitted from the main board 1 from being radiated to the antenna 2. For example, the dielectric portion 32 may be provided in a plate-like structure, and the metal portion 31 may be provided in the dielectric portion 32 so that the metal portion 31 is sandwiched in the dielectric portion 32. By adjusting the arrangement position and the shape structure of the metal part 31, a frequency selective surface capable of blocking passage of electromagnetic waves of a specific frequency can be formed.

When the noise electromagnetic wave is incident to the frequency selective surface position, electrons in the metal part 31 may oscillate by an electric field force corresponding to the noise electromagnetic wave, thereby inducing a current in the metal part 31. Depending on the position and shape of the arrangement, parasitic inductances and/or parasitic capacitances can be generated on the frequency selective surface, so that the frequency selective surface has a specific resonance frequency. When the frequency of the noise electromagnetic wave is equal to or close to the resonance frequency, most of the energy in the noise electromagnetic wave is converted into an induced current, so that the energy of the noise electromagnetic wave is consumed through the induced current. Meanwhile, the induced current can form a radiation field to change the radiation direction of the noise electromagnetic wave, so that the noise electromagnetic wave is prevented from being radiated to the antenna 2, and the suppression effect on the noise electromagnetic wave is realized.

The specific shape and arrangement of the metal portion 31 and the dielectric portion 32 on the frequency selective surface may be set according to the frequency of the noise electromagnetic wave to be suppressed. That is, in order to suppress noise electromagnetic waves of different frequencies, the metal part 31 and the dielectric part 32 having different shapes and arrangement positions may be provided on the noise suppressing plate 3. For example, the metal portion 31 has a resistivity of < 1 × 10^-4(Ω · m), the relative dielectric constant of the dielectric portion 32 is 1 to 20, and the overall structural size is 5mm to 150mm, the dielectric portion can be formed to have a dielectric constant for a dielectric layerAnd inhibiting the electromagnetic waves in the 2-6GHz frequency band.

In one embodiment, as shown in fig. 2, a metal part 31 is embedded in a dielectric part 32 in a C-shape to form a frequency selective surface. The C-shaped structure can be a rectangle with an opening, a ring, a round corner rectangle and the like, and comprises a branch part and an opening part. Electrons in the branch portion of the metal part 31 may induce an electromagnetic field in the space to generate oscillation, forming an induced current. The opening portion of the metal portion 31 may form a "metal-dielectric-metal" capacitor structure to generate a parasitic capacitance on the frequency selective surface and consume the energy of the noise electromagnetic wave. Therefore, the metal portion 31 of the C-shaped structure is beneficial to induce current when electromagnetic waves are incident, and parasitic capacitance is generated on the noise suppression plate 3, especially at the opening of the C-shaped structure, so that energy of the noise electromagnetic waves is consumed, a radiation field is formed, the radiation direction of the noise electromagnetic waves is changed, and the noise electromagnetic waves are prevented from passing through.

In order to obtain a better noise suppression effect, as shown in fig. 3, a plurality of metal portions 31 may be provided in the dielectric portion 32. The plurality of metal parts 31 may be disposed in the dielectric part 32 in a specific arrangement. For example, 4 metal parts 31 are arranged in a 2 × 2 rectangular array or a circular array in the dielectric part 32 to increase the effective area in the height direction and the width direction and to improve the effect of suppressing noise electromagnetic waves.

The plurality of metal portions 31 may be embedded in the dielectric portion 32 in other manners to form a parasitic capacitance or a parasitic inductance structure. For example, if the plurality of metal portions 31 have a rectangular frame structure with an opening at one end and the plurality of metal portions 31 are nested with each other, parasitic capacitance can be formed at the opening of the C-shaped rectangular frame metal portion 31 and also between adjacent metal portions 31, and thus energy in the electromagnetic wave can be consumed more effectively and the noise suppression effect can be improved.

Taking the example of providing two metal parts 31 in the dielectric part 32, the two metal parts 31 may be nested with each other centering on a fixed point on the dielectric part 32. The points of the media sections 32 for nesting with one another may be selected based on the particular shape of the media sections 32. For example, the center point of the dielectric portion 32 may be selected as the fixed point so as to provide a greater number of metal portions 31 in the dielectric portion 32. That is, when the medium section 32 has a rectangular plate-like structure, the fixed point may be an intersection of diagonal lines of the rectangle. The intersection point of the diagonal lines of the rectangular frame structures of the two metal parts 31 and the intersection point of the diagonal lines of the medium part 32 are set to coincide with each other, so that the mutually nested arrangement with the fixed point as the center is realized.

Since the C-shaped opening of the metal portion 31 forms a capacitor-shaped structure and has a discontinuous structure, the discontinuous structure may reduce the effect of suppressing the noise electromagnetic wave in this region. Therefore, when two metal parts 31 are provided in the dielectric part 32, the rectangular frames of the two metal parts 31 may be opened in opposite directions. By setting the opening directions of the rectangular frames to be opposite, the opening positions of the plurality of metal portions 31 can be shifted, the suppression effect of each portion of the noise suppression plate 3 can be equalized, and the suppression effect as a whole can be improved.

Through setting specific size parameters of the C-shaped structure metal part, the suppression of noise electromagnetic waves with specific frequency can be realized. That is, in one embodiment, when the antenna 2 is a WiFi antenna or a bluetooth antenna, since the signal transmission frequency of the antenna 2 is 2.4GHz, the noise electromagnetic wave with the frequency of 2.4GHz may affect the signal receiving process of the WiFi antenna or the bluetooth antenna, and the antenna sensitivity is reduced. In order to suppress noise electromagnetic waves having a frequency of 2.4GHz, the opening width of the rectangular frame of the metal part 31 may be set to 4-5mm, the side length of the rectangular frame of the metal part 31 located at the outer ring may be 35-45mm, the side length of the rectangular frame of the metal part 31 located at the inner ring may be 15-25mm, and the width of the rectangular frame of the metal part 31 may be set to 0.1-1 mm.

For example, the metal part 31 on the outer ring may have a side length of 40mm, the metal part 31 on the inner ring may have a side length of 20mm, the metal parts 31 may have a width of 0.5mm, and the material may be pure copper. The dielectric portion 32 is a square plate having a side length of 41mm and a relative dielectric constant of 3.5, and forms a frequency selective surface. The noise suppression plate 3 is arranged in the area between the main board 1 and the antenna 2 in a mode of being perpendicular to the mounting plate 4, and the noise suppression plate can have a suppression effect on 2.4GHz noise electromagnetic waves radiated from the main board 1 to the antenna 2.

Based on the noise suppressing plate 3 with the C-shaped structure, it is also possible to change the noise electromagnetic wave that can be suppressed by the frequency selective surface by providing the shapes of the metal portion 31 and the dielectric portion 32. For example, as shown in fig. 4, the positions of the metal part 31 and the dielectric part 32 may be interchanged. That is, the dielectric portion 32 may be formed in a C-shaped structure, and the metal portion 31 may be formed in a rectangular plate structure so that the dielectric portion 32 is sandwiched between the metal portions 31. The structure can also form a metal-dielectric-metal capacitor structure at multiple positions, and consumes the energy of noise electromagnetic waves.

In one embodiment, as shown in fig. 5, the metal part 31 may also be embedded in the dielectric part 32 in a cross shape. For example, the dielectric portion 32 may be formed by making a rectangular plate structure of a polyvinyl chloride material having a relative dielectric constant of 3.5. The metal part 31 of the cross-shaped structure made of pure copper is embedded in the rectangular plate structure of the medium part 32 to form the noise suppression plate 3. The total width of the formed cross is 35-45mm, the total height is 35-45mm, and the metal width of the cross branch is 5-10 mm.

The noise suppression plate 3 with the cross-shaped metal part 31 is arranged between the main board 1 and the antenna 2, and can induce current and form a radiation field when a noise electromagnetic wave of a specific frequency is incident, so that the noise electromagnetic wave of the frequency can be suppressed from radiating to the position of the antenna 2. For example, if the total width and total height of the cross-shaped metal part 31 are 40mm and the metal width of the cross-shaped branches is 5mm, it is possible to suppress noise electromagnetic waves having a frequency of 2.4 GHz.

The metal part 31 having the cross-shaped structure is simple in structure and easy to machine, and can simplify the machining process of the noise suppressing plate 3 and reduce the manufacturing cost of the noise suppressing plate 3. The metal part 31 with the cross-shaped structure is also convenient for forming a radiation field after current is induced, so that the radiation field can radiate electromagnetic waves in a direction away from the antenna 2, namely, the effect of reflecting noise electromagnetic waves is achieved, and the inhibition effect on the noise electromagnetic waves is improved. Similarly, for the noise suppressing plate 3 with a cross-shaped structure, the positions of the metal part 31 and the dielectric part 32 may be interchanged, that is, as shown in fig. 6, the dielectric part 32 is embedded in the metal part 31 in a cross shape to form a frequency selective surface capable of suppressing a noise electromagnetic wave of a specific frequency.

In one embodiment, as shown in fig. 7, the metal part 31 is embedded in the dielectric part 32 in an i-shape; alternatively, as shown in fig. 8, the dielectric portion 32 is provided in an i-shape embedded in the metal portion 31 to form a frequency selective surface. The metal part 31 of the i-shaped structure is equivalent to the combination of two metal parts 31 of the C-shaped structure, that is, the vertical edges of the two C-shaped structures are abutted together to form the i-shaped structure. For example, the noise suppressing plate 3 may be formed by forming the dielectric portion 32 of a rectangular plate-like structure from a ceramic material and embedding the metal portion 31 of an i-shaped structure from pure copper in the dielectric portion 32. The total height of the formed I-shaped structure is 15-25mm, the total width is 15-25mm, the width of the metal branch on two transverse edges is 0.1-1mm, and the width of the metal branch on one vertical edge is 0.2-2 mm. And then the noise suppression plate 3 is arranged between the main board 1 and the antenna 2, so that current is induced by the I-shaped structure on the noise suppression plate 3 and a radiation field is formed, and the purpose of reflecting noise electromagnetic waves with the frequency of 2.4GHz is achieved.

It can be seen that in the above-described embodiment, by providing the metal portion 31 and the dielectric portion 32 on the noise suppression plate 3 in a C-shaped, cross-shaped, i-shaped, or the like structure, a frequency selective surface can be formed. The formed frequency selection surface can induce current aiming at the noise electromagnetic wave with specific frequency, generate parasitic capacitance or parasitic inductance and form a radiation field, so that the noise electromagnetic wave emitted by the mainboard 1 can be absorbed or reflected, the radiation of the noise electromagnetic wave to the position of the antenna 2 is inhibited, the interference of the noise electromagnetic wave to the transmitting and receiving signals of the antenna 2 is reduced, and the sensitivity of the antenna 2 is improved.

In order to improve the suppression effect of the noise electromagnetic wave, in one embodiment, a plurality of metal portions 31 and/or a plurality of dielectric portions 32 may be provided on the noise suppression plate 3. The plurality of metal portions 31 or the plurality of dielectric portions 32 may not only form a capacitance structure between adjacent metal portions 31 to generate more parasitic capacitance on the noise suppressing plate 3, consuming energy in the noise electromagnetic wave. Furthermore, the plurality of metal parts 31 can form a frequency selection surface for noise electromagnetic waves of different frequencies, thereby suppressing a plurality of noise electromagnetic wave signals.

When the plurality of metal portions 31 or the plurality of dielectric portions 32 are provided on the noise suppressing plate 3, the plurality of metal portions 31 and/or the plurality of dielectric portions 32 may have the same structure or different structures. That is, the shape of the plurality of metal parts 31 and/or the plurality of dielectric parts 32 may be one or a combination of C-shaped structures, cross-shaped structures, and i-shaped structures.

Wherein a plurality of metal parts 31 of the same structure can increase the effective area of the noise suppressor plate 3. For example, as shown in fig. 3, 4 metal parts 31 of C-shaped structure may be provided in a dielectric part 32 of rectangular plate structure, forming a frequency selective surface including a plurality of metal branches. The 4 metal parts 31 may be grouped into two metal parts, and each group is of a nested structure. The noise suppressing plate 3 including 4C-shaped structural metal parts 31 can increase the effective area of the noise suppressing plate 3 by nearly one time, effectively improving the noise suppressing effect, compared to the noise suppressing plate 3 including two C-shaped structural metal parts 31. Meanwhile, the metal parts 31 positioned on the outer ring in the two groups can generate a metal-dielectric-metal capacitor structure at the adjacent two edge positions, so that parasitic capacitance can be generated at the adjacent two edge positions conveniently, energy in noise electromagnetic waves is consumed, and the noise suppression effect is improved.

Similarly, more groups or numbers of C-shaped structural metal parts 31 may be provided in the noise suppression plate 3 according to the need of the actual suppression effect and the internal space condition of the electronic device. For example, the noise trap 3 may include three sets (6) of C-shaped structural metal parts 31 and four sets (8) of C-shaped structural metal parts 31. And, the arrangement of the multiple groups of C-shaped structural metal parts 31 can be set according to the size of the space between the antenna 2 and the motherboard 1. For example, when the space width of the region between the main board 1 and the antenna 2 is large but the height is small, the plurality of sets of C-shaped structural metal parts 31 may be arranged side by side in a line on the noise suppression board 3. When the space width of the region between the main board 1 and the antenna 2 is small but the height is large, the plurality of groups of C-shaped structural metal parts 31 can be arranged in m × n layers on the noise suppression plate 3, so that when the main board 1 and the antenna 2 have different positional relationships, the noise electromagnetic waves can be specifically suppressed from passing through the noise suppression plate 3.

When the noise suppressing plate 3 is provided with a plurality of metal parts 31 having different structures, the noise electromagnetic waves having different frequencies can be suppressed by the plurality of metal parts 31 having different structures. For example, as shown in fig. 9, two sets of metal parts 31 may be provided in a dielectric part 32 of a rectangular plate structure. Wherein, the group at the left side in the figure comprises two C-shaped structural metal parts 31 which are nested with each other, and the group at the right side in the figure comprises a metal part 31 with a cross-shaped structure.

The two sets of metal parts 31 may have a suppressing effect for two noise frequencies. For example, for an electronic device with dual WiFi antennas, the transmission frequencies of the two WiFi antennas are 2.4GHz and 5.0GHz, respectively. Accordingly, of the electromagnetic waves radiated by the main board 1, the electromagnetic waves with frequencies of 2.4GHz and 5.0GHz can affect the transmission process of the antenna 2, that is, by adjusting the shape structure and the position relationship of the two sets of metal parts 31, the left set of C-shaped structure metal parts 31 is set to suppress the 2.4GHz noise electromagnetic waves, and the right set of C-shaped structure metal parts 31 is set to suppress the 5.0GHz noise electromagnetic waves. So that the noise suppression plate 3 can simultaneously suppress noise electromagnetic waves having frequencies of 2.4GHz and 5.0 GHz.

It can be seen that the noise suppression plate 3 is provided with a plurality of metal parts 31 having different structures, which can suppress a plurality of types of noise electromagnetic waves among the electromagnetic waves radiated from the main board 1, and thus can adapt to a communication system with multiple antennas or multiple transmission frequencies, and reduce the influence of the noise electromagnetic waves on the transmission/reception performance of the antenna 2.

It should be noted that, in the above embodiment, the structural difference among the plurality of structurally different metal portions 31 included on the noise suppressor plate 3 may refer to a completely different shape, for example, one group of metal portions 31 is a C-shaped structure, and the other group of metal portions 31 is a cross-shaped structure; for example, the two groups of metal parts 31 are both C-shaped, but the two groups of metal parts 31 have different opening sizes, side lengths and branch widths, and can also achieve the effect of suppressing noise electromagnetic waves with different frequencies. Further, it is also possible to achieve a suppression effect for noise electromagnetic waves of the same frequency for a plurality of metal parts 31 of different shapes. For example, when one set of metal portions 31 has a C-shaped structure and the other set of metal portions 31 has a cross-shaped structure, the shape structure and the arrangement position of the two sets of metal portions 31 can also suppress electromagnetic noise waves of 2.4GHz, thereby making full use of the space above the noise suppressing plate 3 and increasing the effective area of the noise suppressing plate 3.

In the above embodiment, the noise suppression board 3 needs to be disposed at a position between the main board 1 and the antenna 2 to be able to suppress the transmission of the electromagnetic wave radiated by the main board 1 to the antenna 2. When the noise suppression board 3 is too close to the main board 1, the electromagnetic wave radiated from the main board 1 is easily radiated to the antenna 2 from the outside of the effective surface of the noise suppression board 3, i.e., the suppression effect of the noise electromagnetic wave is reduced. When the distance between the noise suppression plate 3 and the antenna 2 is too close, the noise suppression plate 3 may intrude into the clearance area of the antenna 2, which may affect the signal transceiving process of the antenna 2. Therefore, when the noise suppression plate 3 is disposed at a position, the noise suppression plate 3 is not necessarily too close to the main board 1 or the antenna 2, and for example, the distance from the noise suppression plate 3 to the main board 1 may be set to be greater than 1mm and the distance from the antenna 2 may be set to be greater than 1 mm.

In order to enable the noise suppression board 3 to more effectively suppress the noise electromagnetic waves, in one embodiment, the noise suppression board 3 may be disposed at an electromagnetic pole point position between the main board 1 and the antenna 2. The electromagnetic extreme point position is a position corresponding to an electric field intensity maximum value or an electric field intensity minimum value point formed by electromagnetic wave radiation in an area between the main board 1 and the antenna 2.

Since the plurality of electrical components on the motherboard 1 can generate noise signals, when the number, types, and positions of the electrical components included in the motherboard 1 are different, the intensity distribution of the electromagnetic waves radiated from the motherboard 1 to the outside is also different. Therefore, when the noise suppression plate 3 is disposed at a position, the position corresponding to the maximum value of the electric field intensity or the minimum value of the magnetic field intensity, that is, the position of the electromagnetic extreme point between the main board 1 and the antenna 2 can be determined by measuring the electric field intensity or the magnetic field intensity. And then the noise suppression plate 3 is arranged at the determined electromagnetic extreme point position to suppress the radiation of the noise electromagnetic wave to the antenna 2.

When the electromagnetic extreme point position between the main board 1 and the antenna 2 is searched, the electric elements included on the main board 1 and the position relationship between the main board 1 and the antenna 2 can be determined. A virtual model is established according to the mainboard 1 and the antenna 2, and then the electromagnetic wave radiation process of the mainboard 1 is simulated through a software simulation experiment, so that the position of an electromagnetic extreme point is determined according to a simulation result. Finally, the noise suppression plate 3 is arranged at the determined electromagnetic extreme point position to suppress the radiation of the noise electromagnetic wave to the antenna 2.

For example, as shown in fig. 10, it can be determined by measurement or simulation that the electromagnetic extreme point position is 25mm below the main board 1 and 12.5mm to the left of the main board 1, and when the noise suppression board 3 is disposed at the electromagnetic extreme point position, it can have a suppression effect on most of the electromagnetic waves radiated from the main board 1.

As shown in fig. 11, through practical tests, the noise suppression board 3 is disposed at the electromagnetic extreme point position, so that noise on the main board 1 can be filtered through the frequency selective surface of the noise suppression board, the intensity of noise radiated to the wifi antenna or the bluetooth antenna is reduced by 12dB, that is, a noise suppression effect of 12dB is obtained, and the suppression of noise signals through the metal wall partition board is less than 3 dB. It can be seen that by placing the noise suppression plate 3 at the electromagnetic extremum point location, a noise suppression effect equal to or better than that of a large-area shield or partition can be obtained using a noise suppression plate 3 having a smaller volume. The noise suppression plate 3 does not occupy too much internal space of the electronic equipment, so that the internal space layout of the electronic equipment is convenient to design, and the light and thin design is realized.

Since a plurality of electric elements capable of radiating a noise signal are provided on the main board 1, and the plurality of electric elements are distributed at a plurality of positions. And, the electronic device may include a plurality of antennas 2, and the electromagnetic wave radiated by the main board 1 may form a plurality of electromagnetic extremum point positions between the main board 1 and the antennas 2. For this purpose, in some embodiments, a plurality of noise suppression boards 3 may also be provided between the main board 1 and the antenna 2, so that one or more noise suppression boards 3 may be provided at each electromagnetic extremum point position. For example, for the area between the main board 1 and one antenna 2, it can be determined by measurement or simulation that two electromagnetic extremum point positions are included between the main board 1 and the antenna 2. And the two noise suppression plates 3 are respectively arranged at the positions of the two electromagnetic extreme points so as to suppress two noise electromagnetic waves passing through the positions of the electromagnetic extreme points.

For another example, as shown in fig. 12, when the electronic apparatus includes two antennas 2, since the two antennas 2 are disposed in two different directions of the main board 1, suppression of noise electromagnetic waves radiated to the two antennas 2 by one noise suppression board 3 cannot be achieved. Therefore, the noise suppression boards 3 may be respectively disposed in the areas between the two antennas 2 and the main board 1, and the specific positions of the noise suppression boards 3 are at the electromagnetic extreme point positions of the two middle areas, and the noise signals radiated from the main board 1 are suppressed from being transmitted to the positions of the two antennas 2.

In the above-described embodiment, the noise suppressing plate 3 may also form a frequency selective surface by the metal portion 31 and the dielectric portion 32, such as the metal portion 31 or the dielectric portion 32 including a C-shaped structure, a cross-shaped structure, and an i-shaped structure, so as to suppress noise electromagnetic waves of a corresponding frequency with respect to the transmission frequency of each antenna 2.

Obviously, different noise suppression boards 2 may be provided as different structures for a plurality of noise suppression boards 3 provided between the main board 1 and the antenna 2. That is, in one embodiment, the metal portions 31 or the dielectric portions 32 on the plurality of noise suppressors 3 are in a combination of one or more of a C-shaped structure, a cross-shaped structure, and an i-shaped structure to form a frequency selective surface for blocking noise electromagnetic waves of different frequencies.

For example, when two WiFi antennas having transmission frequencies of 2.4GHz and 5.0GHz are included in the electronic device, and the two antennas 2 are located on different sides of the main board 1, at least one noise suppression board 3 may be provided on each of the two sides. Further, since the transmission frequencies of the antennas 2 on both sides are different, the specific structure of the noise suppression plate 3 provided is also different. That is, as shown in fig. 13, the noise suppression plate 3 located on the left side of the main board 1 includes two metal portions 31 having a C-shaped structure, and is capable of suppressing noise electromagnetic waves having a frequency of 2.4 GHz; the noise suppressing plate 3 located on the right side of the main plate 1 includes a metal portion 31 having an i-shaped structure, and is capable of suppressing noise electromagnetic waves having a frequency of 5.0 GHz. By providing the noise suppression plates 3 having different structures, it is possible to suppress noise electromagnetic waves of different frequencies, and to improve the sensitivity of the plurality of antennas 2.

When a plurality of noise suppressing plates 3 are provided in the region between the main board 1 and one antenna 2, the plurality of noise suppressing plates 3 may be provided to include metal portions 31 or dielectric portions 32 having different shapes. For example, two noise suppressors 3 may be disposed between the main board 1 and one antenna 2, wherein one noise suppressor 3 includes a cross-shaped metal portion 31 and the other noise suppressor includes an i-shaped metal portion 31. Therefore, the two noise suppression plates 3 are used for suppressing the noise electromagnetic waves of two frequencies, or the two noise suppression plates 3 are used for increasing the area of the frequency selection surface with the suppression effect, and a better noise electromagnetic wave suppression effect is achieved on the premise of not increasing the area of the surface of each noise suppression plate 3.

According to the above embodiment, the noise suppression board 3 can suppress the noise signal radiated from the main board 1 to the antenna 2 after being disposed between the main board 1 and the antenna 2. But the electromagnetic wave generated by part of the electric elements on the main board 1 can be radiated directly or through other electric elements adjacent to the electric elements. For example, when the chip 11 is included on the main board 1, in order to dissipate heat generated by the chip 11, a heat-dissipating metal sheet 12 is generally provided in the vicinity of the chip 11. The heat dissipation metal plate 12 may be made of metal material such as aluminum, copper, etc. which is easy to conduct heat, and is used for carrying the heat dissipation function of the chip 11. Since the heat dissipating metal sheet 12 is made of a metal material, electromagnetic waves generated from the chip 11 are radiated while carrying a heat dissipating function. The surface area of the heat dissipation metal sheet 12 relative to the chip 11 is larger, so that the electromagnetic wave is easier to radiate to the antenna 2.

For this reason, in some embodiments, if the chip 11 and the heat dissipating metal sheet 12 are provided on the main board 1, the noise suppressing plate 3 may be disposed outside a range covered by the orthographic projection of the heat dissipating metal sheet 12 to the mounting board 4 to prevent the noise electromagnetic waves radiated through the heat dissipating metal sheet 12 from being radiated to the antenna 2.

For example, as shown in fig. 14, the motherboard 1 includes a chip 11 of 10 × 10mm, and a heat-dissipating metal sheet 12 of 50 × 50mm is disposed above the chip 11. The heat-dissipating metal sheet 12 is in contact with the chip 11, or attached to the chip 11 through a heat-conductive silicone grease. The chip 11 generates electromagnetic waves during the operation of the motherboard 1, and the generated electromagnetic waves can be conducted to the heat dissipation metal sheet 12 and radiated outward through the heat dissipation metal sheet 12. Since electromagnetic waves can be radiated to the outside through the entire heat-dissipating metal sheet 12, if the noise suppression plate 13 is disposed within a range covered by the orthographic projection of the heat-dissipating metal sheet 12 to the mounting board 4, the noise electromagnetic waves can be radiated to the antenna 2 through the edge position of the heat-dissipating metal sheet 12, and the noise electromagnetic waves cannot be suppressed.

Therefore, in order to suppress the radiation of noise electromagnetic waves to the position of the antenna 2, the noise suppression plate 3 may be disposed outside the range covered by the orthographic projection of the heat dissipation metal piece 12 to the mounting board 4. In this way, the noise electromagnetic wave radiated toward the antenna 2 through any position of the heat dissipation metal sheet 12 needs to pass through the area where the noise suppression plate 3 is located, and the influence of the noise electromagnetic wave on the signal transceiving process of the antenna 2 can be reduced by the suppression effect of the noise suppression plate 3.

In the above-described embodiment, the noise suppression sheet 3 can suppress electromagnetic waves of a specific frequency, but since the antenna 2 has an electromagnetic wave transmission function in addition to receiving electromagnetic waves, when the noise suppression sheet 3 is provided, the noise suppression sheet 3 may suppress electromagnetic waves emitted from the antenna 2, affecting the communication quality of the antenna 2. Thus, in some embodiments, as shown in fig. 16, the mounting board 4 is provided with a shielding region 5, and the shielding region 5 refers to the region on the mounting board 4 other than the clearance region of the antenna 2. For example, when the antenna 2 is disposed at an edge position of the rectangular mounting board 4, the shielding region 5 is a rectangular region of the mounting board 4 at a certain distance from the edge region. The noise suppression plate 3 is arranged in the range of the shielding area 5, so that the noise suppression plate 3 can be prevented from invading the clearance area of the antenna 2, and the influence on the normal communication process of the antenna 2 is reduced.

In addition, in one embodiment, since the main board 1 is provided with electrical elements such as high-speed signal lines, the electrical elements can radiate electromagnetic wave signals outwards in the process of transmitting electrical signals to the antenna 2, that is, common mode noise radiation is formed on the main board 1. Therefore, the shape and size parameters of the metal part 31 and the dielectric part 32 can be adjusted by providing a frequency selective surface on the noise suppression board 3, so that the noise suppression board can suppress the common mode noise radiated on the main board 1. For example, if the antenna 2 on the electronic device is a WiFi antenna or a bluetooth antenna, the common mode noise radiated on the motherboard 1 with a frequency of 2.4GHz will affect the signal transceiving process of the WiFi antenna or the bluetooth antenna, and reduce the sensitivity of the WiFi antenna or the bluetooth antenna. For this reason, the metal part 31 on the noise suppression plate 3 is embedded in the dielectric part 32 in a cross shape, and the size parameter of the cross-shaped structure is adjusted to form a frequency selection surface for the frequency of 2.4GHz, so as to achieve the effect of suppressing the common mode noise on the main board 1.

As can be seen from the above technical solutions, in the electronic device provided in the above embodiment, the noise suppression plate 3 is disposed between the main board 1 and the antenna 2, so that the frequency selection surface of the noise suppression plate 3 suppresses the noise electromagnetic waves radiated from the main board 1 to the antenna 2, and reduces the influence of the noise electromagnetic waves on the transmission and reception processes of the antenna 2. The noise suppression plate 3 can suppress the passing of noise electromagnetic waves through the frequency selective surface formed by the metal part 31 and the dielectric part 32, so that the sensitivity of the antenna 2 is improved, a good noise suppression effect can be obtained through a small plate surface area, and the occupation of the internal space of the electronic equipment is reduced.

In the above embodiment, the electronic device is any one of electronic products such as an intelligent large screen, a router, a notebook or a tablet, and the antenna is a wifi antenna or a bluetooth antenna.

Based on the electronic device provided in the foregoing embodiment, some embodiments of the present application further provide a communication system, which includes a sending end and a receiving end. The sending end is used for generating an electromagnetic wave signal according to specific communication data and directly or indirectly sending the electromagnetic wave signal to the receiving end in a wireless communication mode, and the receiving end is used for receiving the electromagnetic wave signal from the sending end and analyzing specific communication data content from the electromagnetic wave signal.

In order to transmit communication data, the transmitting end and the receiving end can establish communication connection, that is, the transmitting end and the receiving end can transmit electromagnetic wave signals according to the appointed signal generation and signal analysis mode, for example, the electromagnetic wave signals with the frequency of 2.4GHz are used for transmitting data. The transmitting end and/or the receiving end comprise the electronic device provided in the above embodiments. Because the electronic equipment comprises the noise suppression plate and the noise electromagnetic wave radiated from the main board to the antenna position is suppressed by the noise suppression plate with smaller volume, the whole volume of the electronic equipment can be lighter and thinner, which is beneficial to simplifying the scale of a communication system and improving the signal transmission sensitivity.

It should be noted that, in the communication system provided in this embodiment, different electronic devices may be used as a sending end and a receiving end in different communication processes. For example, when the electronic device a sends data to the electronic device B, the electronic device a serves as a sending end, and the electronic device B serves as a receiving end; when the electronic device B feeds back data to the electronic device a, the electronic device B serves as a sending end, and the electronic device a serves as a receiving end, so that different data receiving and sending processes are adapted.

The electronic devices comprised by the communication system may employ different types of devices depending on the different application scenarios of the communication system. For example, the electronic device as a transmitting end or a receiving end may be an outdoor communication base station, a smart terminal device, a smart wearable device, a network relay device, and the like. For the application of the technical solutions provided in the embodiments of the present application to other designs, detailed descriptions are omitted here, and those skilled in the art can also think of applying the technical solutions provided in the embodiments of the present application to other designs without departing from the protection scope of the embodiments of the present application.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. An electronic device, comprising: the antenna comprises a mounting plate, a main board, an antenna and a noise suppression plate;

the main board, the antenna and the noise suppression board are all arranged on the mounting board; the noise suppression board is positioned between the main board and the antenna;

wherein the noise suppression plate includes a dielectric portion and a metal portion; the dielectric part and the metal part form a frequency selective surface which generates an induced current and forms electromagnetic wave reflection when a noise electromagnetic wave radiated from the main board is incident, so as to prevent the noise electromagnetic wave from being radiated to the antenna.

2. The electronic device of claim 1,

the metal part is embedded in the dielectric part in a C shape to form the frequency selective surface.

3. The electronic device of claim 2,

the medium part is provided with a plurality of metal parts, and each metal part is of a rectangular frame structure with an opening at one end.

4. The electronic device of claim 3,

the medium part is provided with two metal parts which are nested with each other by taking a fixed point on the medium part as a center; the rectangular frames of the two metal parts have opposite opening directions.

5. The electronic device of claim 4,

the opening width of the rectangular frame of the metal part is 4-5mm, the side length of the rectangular frame of the metal part positioned on the outer ring is 35-45mm, the side length of the rectangular frame of the metal part positioned on the inner ring is 15-25mm, and the width of the rectangular frame of the metal part is 0.1-1 mm.

6. The electronic device of any of claims 2-4,

the arrangement positions of the metal part and the medium part can be interchanged, so that the medium part is embedded and arranged in the metal part in a C shape after the positions are interchanged.

7. The electronic device of claim 1,

the metal part is embedded in the medium part in a cross shape; alternatively, the dielectric portion is embedded in the metal portion in a cross shape to form the frequency selective surface.

8. The electronic device of claim 1,

the metal part is embedded in the medium part in an I shape; alternatively, the dielectric portion is embedded in the metal portion in an i-shape to form the frequency selective surface.

9. The electronic device of claim 1,

the noise suppression plate comprises a plurality of metal parts and/or a plurality of medium parts;

the metal parts and/or the medium parts are/is one or more of C-shaped structures, cross-shaped structures and I-shaped structures.

10. The electronic device of claim 1,

the noise suppression plate is disposed at an electromagnetic pole point position between the main board and the antenna.

11. The electronic device of claim 10,

a plurality of noise suppression plates are arranged between the main board and the antenna, and the noise suppression plates are respectively arranged at one or more electromagnetic extreme point positions.

12. The electronic device of claim 11,

the metal parts or the medium parts on the noise suppression plates are in one or more combinations of C-shaped structures, cross-shaped structures and I-shaped structures so as to form frequency selection surfaces for blocking noise electromagnetic waves of different frequencies.

13. The electronic device of claim 1,

the mainboard is provided with a heat dissipation metal sheet which is used for bearing the heat dissipation function of the mainboard; the noise suppression plate is arranged outside the range covered by the orthographic projection of the heat dissipation metal sheet to the mounting plate so as to prevent noise electromagnetic waves radiated by the heat dissipation metal sheet from radiating to the antenna.

14. The electronic device of claim 1,

the mounting plate is provided with a shielding area, and the shielding area is an area outside the antenna clearance area on the mounting plate; the noise suppression plate is disposed within the shielded region.

15. The electronic device of claim 1,

the antenna is a WiFi antenna or a Bluetooth antenna, the mainboard can radiate common-mode noise, and the noise suppression board is used for suppressing the common-mode noise.

16. A communication system is characterized by comprising a sending end and a receiving end; the sender establishes a communication connection with the receiver, and the sender and/or the receiver comprises the electronic device of any one of claims 1-15.