Electromagnetic bandgap structure, circuit board, server and electronic equipment

Abstract

The embodiment of the present application provides an electromagnetic bandgap structure, a circuit board, a server and an electronic device. The electromagnetic bandgap structure includes: a central part, a surrounding part and a peripheral part, wherein the surrounding part is connected to the central part and is wound around the periphery of the central part, and a first gap is provided between the central part and the surrounding part. The peripheral part is connected to the surrounding part and is sleeved on the periphery of the surrounding part, and a second gap is provided between the peripheral part and the surrounding part. In this way, the surrounding part forms a horseshoe-shaped structure. During the use of the electromagnetic bandgap structure, the winding part will generate inductance, which increases the inductance of the electromagnetic bandgap structure. At the same time, capacitance is generated between the central part and the surrounding part with the first gap, which can also increase the capacitance of the electromagnetic bandgap structure. In addition, the peripheral part can form a protective wall to suppress the noise source inside, avoid the generation of signal interference sources, and improve the effect of suppressing noise bandwidth. In addition, the electromagnetic bandgap structure forms a relatively complete ring structure, so that the integrity of the signal is better.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic devices, and specifically relates to an electromagnetic bandgap structure, a circuit board, a server and an electronic device. Background Art

[0002] EBG (Electromagnetic Band Gap) is a periodic microwave structure with band-stop characteristics, slow-wave characteristics, and high equivalent characteristic impedance characteristics. It can affect the propagation of electromagnetic waves and has a wide range of applications in electronic devices.

[0003] In the prior art, in order to make the electromagnetic bandgap structure have a better noise suppression bandwidth effect, a linear channel is usually used for signal transmission, and the linear channel includes a plurality of basic unit arrays.

[0004] However, in the process of studying the prior art, the inventors found that the gaps between the basic units on the linear channel are relatively large, which greatly affects the integrity of the power plane, resulting in poor signal integrity and the inability to balance noise suppression bandwidth and signal integrity. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide an electromagnetic bandgap structure, a circuit board, a server and an electronic device that overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides an electromagnetic bandgap structure, the electromagnetic bandgap structure comprising: a central portion, a surrounding portion, and a peripheral portion;

[0008] The surrounding portion is connected to the central portion and is wound around the outer periphery of the central portion, and a first gap is provided between the central portion and the surrounding portion;

[0009] The outer portion is connected to the surrounding portion and sleeved on the outer circumference of the surrounding portion, and a second gap is provided between the outer portion and the surrounding portion.

[0010] Optionally, the wrapping portion includes a central connecting line and a wrapping line connected to the central connecting line;

[0011] The central connecting line is connected to the central portion, the winding line is wound around the outer periphery of the central portion, and the first gap is provided between the winding line and the central portion.

[0012] Optionally, the central connecting line includes a first connecting line and a second connecting line that are spaced apart;

[0013] One end of the first connecting wire is connected to the central portion, the other end of the first connecting wire is connected to one end of the winding wire, the other end of the winding wire is connected to one end of the second connecting wire, and the other end of the second connecting wire is connected to the central portion.

[0014] Optionally, the wrapping portion further includes a peripheral connecting wire;

[0015] The peripheral connection line is connected to the winding line, the peripheral portion is connected to the peripheral connection line, and the second gap is provided between the peripheral portion and the winding line.

[0016] Optionally, the first gap includes any value between 1-5 mm.

[0017] Optionally, the second gap includes any value between 1-5 mm.

[0018] In a second aspect, an embodiment of the present application further provides a circuit board, the circuit board comprising a battery layer and the electromagnetic bandgap structure;

[0019] The electromagnetic band gap structure is connected to the battery layer.

[0020] Optionally, there are multiple electromagnetic band gap structures, and the multiple electromagnetic band gap structures are distributed in an array on the battery layer, and the outer peripheries of two adjacent electromagnetic band gap structures are connected to each other.

[0021] Optionally, the electromagnetic bandgap structure further includes a connecting line;

[0022] In two adjacent electromagnetic band gap structures distributed along the longitudinal direction, one end of the connecting line is connected to the central part of one of the electromagnetic band gap structures, and the other end of the connecting line is connected to the peripheral connecting line of the other electromagnetic band gap structure.

[0023] In a third aspect, an embodiment of the present application further proposes a server, which includes the circuit board.

[0024] In a fourth aspect, an embodiment of the present application further proposes an electronic device, which includes the circuit board.

[0025] In an embodiment of the present application, the electromagnetic bandgap structure includes: a central part, a surrounding part and a peripheral part, wherein the surrounding part is connected to the central part and is wound around the periphery of the central part, and a first gap is provided between the central part and the surrounding part. The peripheral part is connected to the surrounding part and is sleeved on the periphery of the surrounding part, and a second gap is provided between the peripheral part and the surrounding part. In this way, the surrounding part wound around the periphery of the central part is added to the electromagnetic bandgap structure to form a horseshoe-shaped structure. During the use of the electromagnetic bandgap structure, the winding part is energized to generate inductance, thereby increasing the inductance of the electromagnetic bandgap structure. At the same time, since a first gap is provided between the central part and the surrounding part, a capacitance is generated between the central part and the surrounding part of the spaced-apart part during the use of the electromagnetic bandgap structure, thereby increasing the capacitance of the electromagnetic bandgap structure. Thus, the resonant frequency of the electromagnetic bandgap structure is increased. In addition, the peripheral portion is arranged at the periphery of the surrounding portion, forming a protective wall for the central portion and the surrounding portion located therein, which can suppress the noise source inside the peripheral portion, avoid the generation of signal interference sources, and improve the noise suppression bandwidth effect of the electromagnetic bandgap structure. In addition, the surrounding portion is wound around the central portion, and the peripheral portion is sleeved on the surrounding portion to form a relatively complete surrounding structure, avoiding the large gap between the basic units on the linear channel, so that the electromagnetic bandgap structure has better integrity and avoids the integrity of the power plane being affected. Therefore, the electromagnetic bandgap structure described in the present application has better noise suppression bandwidth effect and signal integrity.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a structural schematic diagram of an electromagnetic bandgap structure described in an embodiment of the present application;

[0029] Figure 2 It is a simulation comparative analysis schematic diagram of an electromagnetic bandgap structure described in an embodiment of the present application;

[0030] Figure 3 It is a structural schematic diagram of a circuit board described in an embodiment of the present application.

[0031] Figure numerals: 10 - central part; 20 - surrounding part; 30 - peripheral part; 21 - winding line; 22 - first connecting line; 23 - second connecting line; 24 - peripheral connecting line; 40 - battery layer; 50 - connecting line. DETAILED DESCRIPTION

[0032] Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0034] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In recent years, in high-frequency digital circuits, with the trend of faster and faster transmission speeds, the integrity of the signal during the transmission process has become particularly important. The signal will be interfered by many factors during transmission. Therefore, avoiding interference during signal transmission has an important impact on the integrity of the signal. Usually, when the signal is transmitted from the transmitter to the receiver, the waveform may be interfered and damaged, resulting in distortion of the received signal. Among them, the influencing factors may include signal timing problems, signal ringing, signal reflection, near-end and far-end crosstalk, switch noise, ground bounce and power rebound, attenuation, capacitive load, electromagnetic radiation, battery interference, etc. In practical applications, reducing noise is a better way to maintain the signal.

[0037] Specifically, the name of the electromagnetic energy gap structure was originally developed from the high impedance surface (HIS), which was mostly used in antenna design at that time. Later, after many scholars and experts discussed its application, its application range has become quite wide. This structure can effectively block the surface current so that its electromagnetic waves are attenuated and not easy to propagate.

[0038] The linear channel electromagnetic energy gap structure in the prior art is constructed by making regular shape cuts on the power layer, and the circuit type formed is an LC parallel circuit. Specifically, the capacitance value (C) is generated by two metal sheets, while the inductance value (L) is generated by the metal sheet, the connecting column and the ground layer respectively. When this equivalent circuit produces a resonance effect, it is equivalent to a high-impedance propagation path, so it is not easy to propagate. It will produce a cutoff frequency band for the frequency band of the electromagnetic wave, and the center frequency on the cutoff frequency band is also the resonant frequency of this equivalent circuit. However, the gap between the basic units on the linear channel electromagnetic energy gap structure is large, which greatly affects the integrity of the power plane, resulting in poor signal integrity, and unable to take into account both noise suppression bandwidth and good signal integrity.

[0039] Reference Figure 1 , showing a schematic diagram of the structure of an electromagnetic bandgap structure described in an embodiment of the present application, referring to Figure 2 , shows a simulation comparison analysis schematic diagram of an electromagnetic bandgap structure described in an embodiment of the present application. The electromagnetic bandgap structure may specifically include: the central portion 10, the surrounding portion 20 and the peripheral portion 30;

[0040] The surrounding portion 20 is connected to the central portion 10 and is wound around the outer circumference of the central portion 10, and a first gap is provided between the central portion 10 and the surrounding portion 20;

[0041] The outer portion 30 is connected to the surrounding portion 20 and sleeved on the outer circumference of the surrounding portion 20 , and a second gap is defined between the outer portion 30 and the surrounding portion 20 .

[0042] In the embodiment of the present application, the surrounding portion 20 wound around the outer periphery of the central portion 10 is added to the electromagnetic band gap structure to form a horseshoe-shaped structure. When the electromagnetic band gap structure is used, the winding portion is energized to generate inductance, which increases the inductance of the electromagnetic band gap structure. At the same time, since a first gap is provided between the central portion 10 and the surrounding portion 20, a capacitance is generated between the central portion 10 and the surrounding portion 20 at the interval during the use of the electromagnetic band gap structure, which can also increase the capacitance of the electromagnetic band gap structure. Thereby, the resonant frequency of the electromagnetic band gap structure is increased.

[0043] In addition, the peripheral portion 30 is arranged on the periphery of the surrounding portion 20, forming a protective wall for the central portion 10 and the surrounding portion 20 located therein, which can suppress the noise source inside the peripheral portion 30, avoid the generation of signal interference sources, and improve the noise suppression bandwidth effect of the electromagnetic bandgap structure. In addition, the surrounding portion 20 is wound around the central portion 10, and the peripheral portion 30 is sleeved on the surrounding portion 20 to form a relatively complete surrounding structure, avoiding the large gap between the basic units on the linear channel, so that the electromagnetic bandgap structure has better integrity and avoids the integrity of the power plane from being affected. Therefore, the electromagnetic bandgap structure described in the present application has a better noise suppression bandwidth effect and signal integrity.

[0044] In addition, the electromagnetic bandgap structure described in the embodiment of the present application can be obtained by directly cutting channels in the power layer, which can increase the number of basic units of the electromagnetic bandgap structure without adding additional power layers, and the operation is simple and easy to implement.

[0045] For example, in the embodiments of the present application, Figure 2 The figure shows a simulation comparison analysis of the electromagnetic bandgap structure of the present application and the existing linear electromagnetic bandgap structure. The horizontal axis represents the bandwidth in GHz (megahertz), the vertical axis represents the cutoff depth in dB (decibel), the solid line represents the existing linear electromagnetic bandgap structure, and the dotted line represents the electromagnetic bandgap structure of the present application with the horseshoe-shaped surrounding portion 20. Figure 2 It can be seen that the bandwidth range of the electromagnetic bandgap structure provided with the horseshoe-shaped surrounding portion 20 of the present application can be extended from 1 GHz to 10 GHz, and its cutoff depth can be increased to (-10)-(-100) dB compared to the existing (-10)-(-50) dB. In addition, the center frequency of the electromagnetic bandgap structure is also increased, so that it can be moved to high frequency.

[0046] In the embodiment of the present application, for example, the central portion 10 may be a metal sheet, which is set to a rectangle with a length of 20 mm. The surrounding portion 20 may be a metal wire, which is set to a width of 2 mm. The peripheral portion 30 may be a metal frame, which is set to a square with a side length of 30 mm. In practical applications, the specific types, materials and sizes of the central portion 10, the surrounding portion 20 and the peripheral portion 30 may be set as needed, and the embodiment of the present application may not limit this.

[0047] Optionally, in an embodiment of the present application, the surrounding portion 20 includes a central connecting wire and a winding wire 21 connected to the central connecting wire, the central connecting wire is connected to the central portion 10, the winding wire 21 is wound around the periphery of the central portion 10, and the first gap is provided between the winding wire 21 and the central portion 10. In this way, the winding wire 21 generates inductance when it is energized, thereby increasing the inductance of the electromagnetic bandgap structure. Moreover, the first gap is formed between the winding wire 21 and the central portion 10, and capacitance is generated between the two, thereby increasing the capacitance of the electromagnetic bandgap structure. By way of example, in an embodiment of the present application, the winding wire 21 can be arranged parallel to the edge line of the central portion 10, so that there is always a gap between the winding wire 21 and the central portion 10 to generate capacitance.

[0048] In the embodiment of the present application, optionally, the central connecting wire includes the first connecting wire 22 and the second connecting wire 23 which are arranged at intervals, one end of the first connecting wire 22 is connected to the central part 10, the other end of the first connecting wire 22 is connected to one end of the winding wire 21, the other end of the winding wire 21 is connected to one end of the second connecting wire 23, and the other end of the second connecting wire 23 is connected to the central part 10. In this way, the connection between the winding wire 21 and the central part 10 is realized by the first connecting wire 22 and the second connecting wire 23, and the first connecting wire 22, the second connecting wire 23 and the winding wire 21 form a horseshoe-like structure.

[0049] In some optional embodiments of the present application, the wrapping portion further includes a peripheral connecting wire 24, the peripheral connecting wire 24 is connected to the wrapping wire 21, the peripheral portion 30 is connected to the peripheral connecting wire 24, and the second gap is provided between the peripheral portion 30 and the wrapping wire 21. In this way, the peripheral portion 30 can be connected to the surrounding portion 20 through the peripheral connecting wire 24.

[0050] For example, in the embodiment of the present application, the first gap includes any value in the range of 1-5 mm, such as 2 mm, 3 mm, etc., so that the capacitance effect between the central portion 10 and the surrounding portion 20 is better, so that the increased capacitance of the electromagnetic bandgap structure has a better effect.

[0051] In the embodiment of the present application, for example, the second gap includes any value in the range of 1-5 mm, such as 2 mm, 3 mm, etc., and there is a suitable gap between the peripheral portion 30 and the surrounding portion 20 .

[0052] In summary, the electromagnetic bandgap structure described in the embodiments of the present application may at least include the following advantages:

[0053] In an embodiment of the present application, the electromagnetic bandgap structure includes: a central part, a surrounding part and a peripheral part, wherein the surrounding part is connected to the central part and is wound around the periphery of the central part, and a first gap is provided between the central part and the surrounding part. The peripheral part is connected to the surrounding part and is sleeved on the periphery of the surrounding part, and a second gap is provided between the peripheral part and the surrounding part. In this way, the surrounding part wound around the periphery of the central part is added to the electromagnetic bandgap structure to form a horseshoe-shaped structure. During the use of the electromagnetic bandgap structure, the winding part is energized to generate inductance, thereby increasing the inductance of the electromagnetic bandgap structure. At the same time, since a first gap is provided between the central part and the surrounding part, capacitance is generated between the central part and the surrounding part of the spaced-apart part during the use of the electromagnetic bandgap structure, thereby increasing the capacitance of the electromagnetic bandgap structure. Thus, the resonant frequency of the electromagnetic bandgap structure is increased. In addition, the peripheral portion is arranged at the periphery of the surrounding portion, forming a protective wall for the central portion and the surrounding portion located therein, which can suppress the noise source inside the peripheral portion, avoid the generation of signal interference sources, and improve the noise suppression bandwidth effect of the electromagnetic bandgap structure. In addition, the surrounding portion is wound around the central portion, and the peripheral portion is sleeved on the surrounding portion to form a relatively complete surrounding structure, avoiding the large gap between the basic units on the linear channel, so that the electromagnetic bandgap structure has better integrity and avoids the integrity of the power plane being affected. Therefore, the electromagnetic bandgap structure described in the present application has better noise suppression bandwidth effect and signal integrity.

[0054] Reference Figure 3 , showing a schematic diagram of the structure of a circuit board proposed in an embodiment of the present application. The circuit board includes a battery layer 40 and the electromagnetic bandgap structure, and the electromagnetic bandgap structure is connected to the battery layer 40. In this way, the electromagnetic bandgap structure can be obtained by directly making channel cutting on the power layer of the circuit board, and the number of basic units of the electromagnetic bandgap structure can also be increased without adding an additional power layer, which is simple and easy to operate. Specifically, the circuit board can also be referred to as PCB (Printed Circuit Board).

[0055] Optionally, in the embodiment of the present application, the number of the electromagnetic band gap structures is multiple, and the multiple electromagnetic band gap structures are distributed in an array on the battery layer 40, and the peripheral portions 30 of two adjacent electromagnetic band gap structures are connected to each other. For example, Figure 3 As shown, the electromagnetic band gap structure can be set to a 3*3 array structure, the number of which is 9. It can also be set to a 4*4 array structure, the number of which is 16, and a 5*5 array structure, the number of which is 25, and so on. The embodiments of the present application do not limit the specific distribution method and the number of settings of the multiple electromagnetic band gap structures.

[0056] In some optional embodiments of the present application, the electromagnetic band gap structure further includes a connecting line 50. In two adjacent electromagnetic band gap structures distributed in the longitudinal direction, one end of the connecting line 50 is connected to the central portion 10 of one of the electromagnetic band gap structures, and the other end of the connecting line 50 is connected to the peripheral connecting line 24 of the other electromagnetic band gap structure. In this way, the two adjacent electromagnetic band gap structures distributed in the longitudinal direction can be connected through the connecting line 50, which is simple and easy to implement. Specifically, the connecting line 50 can be set between the first connecting line 22 and the second connecting line 23 of one of the electromagnetic band gap structures, and the specific setting position of the connecting line 50 may not be limited in the embodiment of the present application.

[0057] In the early technology, the electromagnetic band gap structure is usually used in antenna design. After several years, some scholars proposed that the principle of this structure can be applied to PCB printed circuit boards to achieve noise suppression. After research, it was confirmed that it does have a good noise suppression effect, which aroused heated discussion. The design structure is constantly changing, the main purpose is to increase the bandwidth of noise suppression and reduce the production cost, and there are many different types of electromagnetic band gap structures.

[0058] In summary, the circuit board described in the embodiment of the present application can at least include the following advantages:

[0059] In an embodiment of the present application, the circuit board includes a battery layer and the electromagnetic bandgap structure, the electromagnetic bandgap structure is connected to the battery layer, and the electromagnetic bandgap structure includes: a central part, a surrounding part and a peripheral part, the surrounding part is connected to the central part and is wound around the periphery of the central part, and a first gap is provided between the central part and the surrounding part. The peripheral part is connected to the surrounding part and is sleeved on the periphery of the surrounding part, and a second gap is provided between the peripheral part and the surrounding part. In this way, the surrounding part wound around the periphery of the central part is added to the electromagnetic bandgap structure to form a horseshoe-shaped structure. During the use of the electromagnetic bandgap structure, the winding part is energized to generate inductance, which increases the inductance of the electromagnetic bandgap structure. At the same time, since a first gap is provided between the central part and the surrounding part, a capacitance is generated between the central part and the surrounding part of the spaced-apart part during the use of the electromagnetic bandgap structure, which can also increase the capacitance of the electromagnetic bandgap structure. Thereby, the resonant frequency of the electromagnetic bandgap structure is increased. In addition, the peripheral portion is arranged at the periphery of the surrounding portion, forming a protective wall for the central portion and the surrounding portion located therein, which can suppress the noise source inside the peripheral portion, avoid the generation of signal interference sources, and improve the noise suppression bandwidth effect of the electromagnetic bandgap structure. In addition, the surrounding portion is wound around the central portion, and the peripheral portion is sleeved on the surrounding portion to form a relatively complete surrounding structure, avoiding the large gap between the basic units on the linear channel, so that the electromagnetic bandgap structure has better integrity and avoids the integrity of the power plane being affected. Therefore, the electromagnetic bandgap structure described in the present application has better noise suppression bandwidth effect and signal integrity.

[0060] The embodiment of the present application further proposes a server, wherein the server comprises the circuit board, that is, the circuit board can be applied to the server.

[0061] Today's technology products are gradually developing towards high speed, small size, low voltage, etc. Especially when the chip speed in high-performance servers is getting faster and faster, the ground bounce noise (GBN) effect has a more significant impact on the system, and it is very important to suppress the GBN effect. In the embodiment of the present application, the electromagnetic band gap structure is used to make the power plane 40 on the circuit board of the server and the complete ground plane (Ground Plane) form a parallel plate waveguide structure referred to as EBG (Electromagnetic Band-Gap), and the EBG structure of the power plane 40 is equivalent to a series LC parallel high-order band rejection filter to achieve the effect of suppressing the ground bounce noise GBN.

[0062] The server described in the embodiment of the present application may at least have the following advantages:

[0063] In an embodiment of the present application, the server includes the circuit board, the circuit board includes a battery layer and the electromagnetic bandgap structure, the electromagnetic bandgap structure is connected to the battery layer, and the electromagnetic bandgap structure includes: a central part, a surrounding part and a peripheral part, the surrounding part is connected to the central part and is wound around the periphery of the central part, and a first gap is provided between the central part and the surrounding part. The peripheral part is connected to the surrounding part and is sleeved on the periphery of the surrounding part, and a second gap is provided between the peripheral part and the surrounding part. In this way, the surrounding part wound around the periphery of the central part is added to the electromagnetic bandgap structure to form a horseshoe-like structure. During the use of the electromagnetic bandgap structure, the winding part is energized to generate inductance, which increases the inductance of the electromagnetic bandgap structure. At the same time, since the first gap is provided between the central part and the surrounding part, capacitance is generated between the central part and the surrounding part of the spaced-apart part during the use of the electromagnetic bandgap structure, which can also increase the capacitance of the electromagnetic bandgap structure. Thereby, the resonant frequency of the electromagnetic bandgap structure is increased. In addition, the peripheral portion is arranged at the periphery of the surrounding portion, forming a protective wall for the central portion and the surrounding portion located therein, which can suppress the noise source inside the peripheral portion, avoid the generation of signal interference sources, and improve the noise suppression bandwidth effect of the electromagnetic bandgap structure. In addition, the surrounding portion is wound around the central portion, and the peripheral portion is sleeved on the surrounding portion to form a relatively complete surrounding structure, avoiding the large gap between the basic units on the linear channel, so that the electromagnetic bandgap structure has better integrity and avoids the integrity of the power plane being affected. Therefore, the electromagnetic bandgap structure described in the present application has better noise suppression bandwidth effect and signal integrity.

[0064] An embodiment of the present application further provides an electronic device, which includes the circuit board.

[0065] In the embodiment of the present application, the electronic device may include but is not limited to any one of a computer, a tablet computer and a wearable device, and the embodiment of the present application may not limit the specific type of the electronic device.

[0066] The electronic device described in the embodiments of the present application may at least have the following advantages:

[0067] In an embodiment of the present application, the electronic device includes the circuit board, the circuit board includes a battery layer and the electromagnetic bandgap structure, the electromagnetic bandgap structure is connected to the battery layer, and the electromagnetic bandgap structure includes: a central part, a surrounding part and a peripheral part, the surrounding part is connected to the central part and is wound around the periphery of the central part, and a first gap is provided between the central part and the surrounding part. The peripheral part is connected to the surrounding part and is sleeved on the periphery of the surrounding part, and a second gap is provided between the peripheral part and the surrounding part. In this way, the surrounding part wound around the periphery of the central part is added to the electromagnetic bandgap structure to form a horseshoe-like structure. During the use of the electromagnetic bandgap structure, the winding part is energized to generate inductance, which increases the inductance of the electromagnetic bandgap structure. At the same time, since the first gap is provided between the central part and the surrounding part, capacitance is generated between the central part and the surrounding part of the spaced-apart part during the use of the electromagnetic bandgap structure, which can also increase the capacitance of the electromagnetic bandgap structure. Thereby, the resonant frequency of the electromagnetic bandgap structure is increased. In addition, the peripheral portion is arranged at the periphery of the surrounding portion, forming a protective wall for the central portion and the surrounding portion located therein, which can suppress the noise source inside the peripheral portion, avoid the generation of signal interference sources, and improve the noise suppression bandwidth effect of the electromagnetic bandgap structure. In addition, the surrounding portion is wound around the central portion, and the peripheral portion is sleeved on the surrounding portion to form a relatively complete surrounding structure, avoiding the large gap between the basic units on the linear channel, so that the electromagnetic bandgap structure has better integrity and avoids the integrity of the power plane being affected. Therefore, the electromagnetic bandgap structure described in the present application has better noise suppression bandwidth effect and signal integrity.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electromagnetic bandgap structure, characterized in that: The electromagnetic bandgap structure comprises: a central portion, a surrounding portion and a peripheral portion; The surrounding portion is connected to the central portion and is wound around the outer periphery of the central portion, and a first gap is provided between the central portion and the surrounding portion; The outer portion is connected to the surrounding portion and is sleeved on the outer circumference of the surrounding portion, and a second gap is provided between the outer portion and the surrounding portion; The surrounding portion includes a central connecting wire and a winding wire connected to the central connecting wire; the central connecting wire is connected to the central portion, the winding wire is wound around the periphery of the central portion, and the first gap is provided between the winding wire and the central portion; The center connecting wire includes a first connecting wire and a second connecting wire arranged at an interval; one end of the first connecting wire is connected to the center part, the other end of the first connecting wire is connected to one end of the winding wire, the other end of the winding wire is connected to one end of the second connecting wire, and the other end of the second connecting wire is connected to the center part; the first connecting wire, the second connecting wire and the winding wire form a horseshoe-shaped structure.

2. The electromagnetic bandgap structure according to claim 1, characterized in that: The surrounding portion further includes a peripheral connection line; The peripheral connection line is connected to the winding line, the peripheral portion is connected to the peripheral connection line, and the second gap is provided between the peripheral portion and the winding line.

3. The electromagnetic bandgap structure according to claim 1, characterized in that: The first gap includes any value between 1-5 mm.

4. The electromagnetic bandgap structure according to claim 1, characterized in that: The second gap may have any value between 1 and 5 mm.

5. A circuit board, characterized in that: The circuit board comprises a battery layer and an electromagnetic bandgap structure according to any one of claims 1 to 4; The electromagnetic band gap structure is connected to the battery layer.

6. The circuit board according to claim 5, characterized in that: There are multiple electromagnetic band gap structures, which are distributed in an array on the battery layer, and the outer peripheries of two adjacent electromagnetic band gap structures are connected to each other.

7. The circuit board according to claim 6, characterized in that: The electromagnetic bandgap structure further includes a connecting line; In two adjacent electromagnetic band gap structures distributed along the longitudinal direction, one end of the connecting line is connected to the central part of one of the electromagnetic band gap structures, and the other end of the connecting line is connected to the peripheral connecting line of the other electromagnetic band gap structure.

8. A server, characterized in that: The server comprises the circuit board described in any one of claims 5-7.

9. An electronic device, characterized in that: The electronic device comprises the circuit board according to any one of claims 5 to 7.

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