A uniform electric near-field planar antenna system based on metasurface structure

Abstract

The present invention relates to a uniform electric near-field planar antenna system based on a metasurface structure. The system comprises a power supply and two main circuit boards connected to the power supply. The two main circuit boards are arranged parallel and opposite each other. Each main circuit board comprises a solid sub-circuit board, multiple capacitors, and multiple annular sub-circuit boards nested from the inside out. The solid sub-circuit board is embedded within the innermost annular sub-circuit board, and an insulating layer is provided between the solid sub-circuit board and the innermost annular sub-circuit board, as well as between adjacent annular sub-circuit boards. The solid sub-circuit board and the innermost annular sub-circuit board, as well as between adjacent annular sub-circuit boards, are connected via multiple capacitors, all of which are located on the insulating layer. Compared with existing technologies, the present invention can produce a higher-intensity and more uniform electric field, is simple to manufacture, and is non-radiative.

Description

Technical Field

[0001] The present invention relates to the field of antenna systems, and in particular to a uniform electric near-field planar antenna system based on a metasurface structure. Background Art

[0002] Electric and magnetic near-field antennas refer to devices that are non-radiative and can convert voltage and current energy into electromagnetic fields. They can be widely used in wireless power transmission, anti-electromagnetic interference of metering equipment, near-field sensing detection, and near-field imaging. Because of its non-radiative nature, the electromagnetic energy is almost all accumulated in a space similar to the size of the antenna, which ensures that the near-field antenna will not affect radio signals and living organisms, and is highly environmentally friendly. Magnetic field antennas are mainly sensitive to magnetic fields and / or mainly generate magnetic fields when driven by current. Electric field antennas are mainly sensitive to electric fields and / or mainly generate electric fields when driven by voltage.

[0003] The simplest and most effective method for generating a uniform electric field in engineering is to arrange a pair of (essentially) identical parallel metal plates within the desired area, with the space between them sufficiently large to encompass the desired area. Electromagnetic or other methods are then used to create a stable potential difference between the plates, generating a uniform electric field within a portion of the space between them. However, at high frequencies ranging from kHz to MHz, and even GHz, the skin effect and boundary effects of large metal surfaces can lead to uneven electric field distribution. This unevenness becomes more pronounced as the input system frequency increases and the wavelength of the aluminum plate decreases. Therefore, at high frequencies, the electric field generated using two existing aluminum PCBs only exhibits high intensity at the edges of the plates, with some areas producing a uniform electric field. The field intensity gradually decreases from the outside inward, and the electric field in the center of the two plates is particularly weak and uneven.

[0004] In summary, the prior art has the following defects:

[0005] (1) The electric field obtained by the existing technology only produces a uniform electric field in a certain area;

[0006] (2) The existing methods for generating electric fields have a large electric field range and high radiation;

[0007] (3) The electric field strength generated by the two aluminum plates in the prior art is uneven; Summary of the Invention

[0008] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a uniform electric near-field planar antenna system based on a metasurface structure. The invention can obtain a higher intensity and more uniform electric field, is simple to manufacture, and is non-radiative.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] The present invention provides a uniform electric near-field planar antenna system based on a metasurface structure, comprising a power supply and two main circuit boards connected to the power supply, the two main circuit boards being arranged in parallel and opposite to each other, each of the main circuit boards comprising a solid sub-circuit board, a plurality of capacitors, and a plurality of annular sub-circuit boards nested from the inside out, the solid sub-circuit board being embedded within the innermost annular sub-circuit board, an insulating layer being provided between the solid sub-circuit board and the innermost annular sub-circuit board, and between adjacent annular sub-circuit boards, the solid sub-circuit board and the innermost annular sub-circuit board, and adjacent annular sub-circuit boards being connected via a plurality of capacitors, all of which being provided on the insulating layer.

[0011] Preferably, the shapes and structures of the two main circuit boards are exactly the same, and both of the two main circuit boards are PCB boards with a super-surface structure.

[0012] Preferably, the number of capacitors provided on each insulating layer ranges from 8 to 100.

[0013] Preferably, all capacitors on each insulating layer are evenly distributed.

[0014] Preferably, the number of capacitors on the inner insulating layer is smaller than the number of capacitors on the outer insulating layer.

[0015] Preferably, the annular sub-circuit board includes a first annular sub-circuit board, the insulating layer includes a first insulating layer, the solid sub-circuit board, the first insulating layer and the first annular sub-circuit board are nested in sequence from the inside to the outside, and the solid sub-circuit board and the first annular sub-circuit board are connected through multiple capacitors, and all of the capacitors are arranged on the first insulating layer.

[0016] Preferably, the annular sub-circuit board includes a first annular sub-circuit board and a second annular sub-circuit board, the insulating layer includes a first insulating layer and a second insulating layer, the solid sub-circuit board, the first insulating layer, the first annular sub-circuit board, the second insulating layer and the second annular sub-circuit board are nested in sequence from the inside to the outside, and the solid sub-circuit board and the first annular sub-circuit board, as well as the first annular sub-circuit board and the second annular sub-circuit board are connected via multiple capacitors, and the capacitors are arranged on the first insulating layer and the second insulating layer.

[0017] Preferably, the solid sub-circuit board, the insulating layer and the annular sub-circuit board are all concentrically arranged.

[0018] Preferably, the uniform electric near-field planar antenna system is used to detect the electromagnetic interference resistance of an object to be measured.

[0019] Preferably, the object to be measured is a gas meter.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The present invention provides a uniform electric near-field planar antenna system based on a metasurface structure. By adopting two PCB boards with metasurface structures, the polarization, phase, polarization mode and other characteristics of electromagnetic waves can be flexibly and effectively controlled, thereby generating a larger and more uniform electric field.

[0022] 2. In the prior art, under high-frequency electric fields, the electric field generated by two aluminum PCBs only has a high intensity at the edges of the boards, while some areas generate a uniform electric field. The electric field strength gradually weakens from the outside to the inside, and the electric field in the center of the two boards is particularly weak and uneven. The present invention provides a uniform electric near-field flat antenna system based on a metasurface structure. By using nested solid sub-circuit boards and multiple annular sub-circuit boards, and connecting adjacent sub-circuit boards with insulating layers and capacitors, the electric field strength range at the edges of all sub-circuit boards away from the center is larger and more uniform, reducing the attenuation of the electric field strength of each sub-circuit board. This enables the system to generate a larger and more uniform electric field within the entire circuit board range.

[0023] 3. The present invention provides a uniform electric near-field planar antenna system based on a metasurface structure that generates an electric field only between two main circuit boards, thereby generating low radiation and causing little harm to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a uniform electric near-field planar antenna system based on a metasurface structure provided in this embodiment;

[0025] Figure 2 for Figure 1 A schematic structural diagram of the overall circuit board of the first embodiment shown in the embodiment;

[0026] Figure 3 for Figure 1 A schematic structural diagram of a general circuit board of a second embodiment of the embodiment is shown;

[0027] Figure 4 for Figure 2 Schematic diagram of electric field distribution of the total circuit board shown;

[0028] Figure 5 for Figure 3 Schematic diagram of electric field distribution of the total circuit board shown;

[0029] Description of the marks in the figure:

[0030] 1. Main circuit board, 21. Solid sub-circuit board, 22. First annular sub-circuit board, 23. Second annular sub-circuit board, 31. First insulating layer, 32. Second insulating layer, 4. Capacitor, 5. Power supply, and 6. Object to be measured. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] A metasurface is a two-dimensional planar structure composed of artificial atoms with special electromagnetic properties arranged in a certain way. It can achieve flexible and effective control of the polarization, amplitude, phase, polarization mode, propagation mode and other characteristics of electromagnetic waves. Example

[0033] refer to Figure 1 As shown, this embodiment provides a uniform electric near-field planar antenna system based on a metasurface structure, including: a power supply 5 and two main circuit boards 1 connected to the power supply 5, and the two main circuit boards 1 are arranged in parallel and opposite to each other.

[0034] As an optional implementation, the bottoms of the two main circuit boards 1 are connected to a base, and the two main circuit boards 1 are arranged parallel and opposite to each other on the base.

[0035] The two main circuit boards 1 have exactly the same shape and structure, and both adopt PCB boards with a super-surface structure.

[0036] Each main circuit board 1 includes a solid sub-circuit board 21, multiple capacitors and multiple annular sub-circuit boards nested from the inside to the outside on the same plane. The solid sub-circuit board 21 is embedded in the annular sub-circuit board with the smallest area, and an insulating layer is provided between the solid sub-circuit board 21 and the innermost annular sub-circuit board and between adjacent annular sub-circuit boards. The solid sub-circuit board 21 and the innermost annular sub-circuit board and between adjacent annular sub-circuit boards are connected through multiple capacitors, and all capacitors are provided on the insulating layer.

[0037] As an optional implementation, the number of capacitors provided on each insulating layer ranges from 8 to 100, and the number of capacitors on the inner insulating layer is smaller than the number of capacitors on the outer insulating layer.

[0038] As an optional implementation, the solid sub-circuit board 21, the insulating layer and the annular sub-circuit board are all arranged concentrically.

[0039] As an optional implementation, the capacitance on each insulating layer is evenly distributed.

[0040] As an optional implementation, the insulating layer is obtained by removing the copper sheet on the circuit board.

[0041] Take a ring-shaped circuit board as an example, refer to Figure 2 In an optional embodiment shown, each main circuit board 1 includes a solid sub-circuit board 21, a first annular sub-circuit board 22, a first insulating layer 31 and multiple capacitors 4. The first annular sub-circuit board 22 and the first insulating layer 31 are both annular structures. The outer side of the solid circuit board 21 is connected to the inner side of the first insulating layer 31, and the outer side of the first insulating layer 31 is connected to the inner side of the first annular sub-circuit board 22. The solid sub-circuit board 21 and the first annular sub-circuit board 22 are connected through multiple capacitors 4, and all capacitors 4 are arranged on the first insulating layer 31.

[0042] As an optional implementation, the size of the two main circuit boards 1 is 20 cm*30 cm, and 30 capacitors 4 are provided.

[0043] refer to Figure 4 As shown, when the two main circuit boards 1 are powered by the power supply 5, the edge position of the first annular sub-circuit board 22 away from the first insulating layer 31 and the edge position of the solid sub-circuit board 21 close to the first insulating layer 31 both generate an electric field with higher field strength and more uniformity, thereby improving the problem in the prior art where a high-intensity electric field is only obtained at the edge position of the board.

[0044] Take two ring-shaped sub-circuit boards as an example, refer to Figure 3 In an optional embodiment shown, each main circuit board 1 includes a solid sub-circuit board 21, a first annular sub-circuit board 22, a second annular sub-circuit board 23, a first insulating layer 31, a second insulating layer 32 and a plurality of capacitors 4. The first insulating layer 31, the second insulating layer 32, the first annular sub-circuit board 22 and the second annular sub-circuit board 23 all have an annular structure. The inner side of the first insulating layer 31 is connected to the outer side of the solid sub-circuit board 21, the outer side of the first insulating layer 31 is connected to the inner side of the first annular sub-circuit board 22, the inner side of the second insulating layer 32 is connected to the outer side of the first annular sub-circuit board 22, and the outer side of the second insulating layer 32 is connected to the inner side of the second annular sub-circuit board 23. The solid sub-circuit board 21 and the first annular sub-circuit board 22, as well as the first annular sub-circuit board 22 and the second annular sub-circuit board 23 are connected via a plurality of capacitors 4, and the capacitors 4 are provided on the first insulating layer 31 and the second insulating layer 32.

[0045] As an optional embodiment, 18 capacitors are provided on the first insulating layer 31 , and 30 capacitors are provided on the second insulating layer 32 . The dimensions of the two total circuit boards 1 are both 20 cm*30 cm.

[0046] refer to Figure 5As shown, when the two main circuit boards 1 are powered by the power supply 5, the edge of the solid sub-circuit board 21 close to the first insulating layer 31, the edge of the first annular sub-circuit board 22 close to the second insulating layer 32, and the edge of the second annular sub-circuit board 23 away from the second insulating layer 33 all generate an electric field with a higher field strength and a more uniform electric field. Figure 2 On the basis of the embodiment shown, the problem in the prior art that a high-intensity electric field is only obtained at the edge of the plate is further improved, and an electric field with a larger and more uniform electric field range is formed.

[0047] Specifically, the object to be measured 6 is a device that requires magnetic field interference. As an optional implementation, the object to be measured 6 is a gas meter.

[0048] When the uniform electric near-field planar antenna system based on a metasurface structure provided in this embodiment is used to detect a gas meter, the operation steps are as follows:

[0049] S1: Place two main circuit boards 1 parallel and opposite to each other so that the distance between the two main circuit boards 1 is just enough to place the gas meter. Turn on the power supply 5 so that the two main circuit boards 1 form a larger and more uniform electric field.

[0050] S2: Connect the power amplifier to the electric near-field flat antenna system through the BNC interface;

[0051] S3: Adjust the power amplifier to the appropriate power and frequency output signal, and observe whether the gas meter is interfered with, and then verify whether the gas meter is qualified.

[0052] During the working process, it is forbidden to place the hands and brain between the two main circuit boards 1 for too long. Operators are prohibited from wearing electronic devices, watches and jewelry on their wrists.

[0053] The present invention provides a uniform electric near-field flat antenna system based on a metasurface structure, which generates a larger and more uniform electric field within the entire circuit board range, and provides more accurate electromagnetic interference resistance detection for equipment that requires magnetic field interference, such as gas meters.

[0054] In summary, the present invention provides a uniform electric near-field planar antenna system based on a metasurface structure. By designing a circuit board, a larger and more uniform electric field can be achieved. Through appropriate adjustment and operation, the system has wide applications in wireless power transmission, electromagnetic interference mitigation for metering equipment, near-field sensing and detection, and near-field imaging. Furthermore, the proposed method for achieving a larger and more uniform electric field is simple, straightforward, and readily available. This makes PCB design easy to implement and effectively achieves a larger and more uniform electric field.

[0055] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A uniform electric near-field planar antenna system based on a metasurface structure, characterized in that: The invention comprises a power supply (5) and two main circuit boards (1) connected to the power supply (5), wherein the two main circuit boards (1) are arranged in parallel and opposite to each other, and each main circuit board (1) comprises a solid sub-circuit board (21), a plurality of capacitors, and a plurality of annular sub-circuit boards nested from the inside to the outside, wherein the solid sub-circuit board (21) is embedded in the innermost annular sub-circuit board, and an insulating layer is provided between the solid sub-circuit board (21) and the innermost annular sub-circuit board, and between adjacent annular sub-circuit boards, and the solid sub-circuit board (21) and the innermost annular sub-circuit board, and between adjacent annular sub-circuit boards, are connected via a plurality of capacitors, and all the capacitors are provided on the insulating layer; All capacitances on each insulating layer are evenly distributed; The solid sub-circuit board (21), the insulating layer and the annular sub-circuit board are all arranged concentrically.

2. The uniform electric near-field planar antenna system based on a metasurface structure according to claim 1, characterized in that: The two main circuit boards (1) have exactly the same shape and structure, and both main circuit boards (1) are PCB boards with a super-surface structure.

3. The uniform electric near-field planar antenna system based on a metasurface structure according to claim 2, characterized in that: The number of capacitors provided on each insulating layer ranges from 8 to 100.

4. The uniform electric near-field planar antenna system based on a metasurface structure according to claim 3, characterized in that: The number of capacitors on the inner insulating layer is smaller than the number of capacitors on the outer insulating layer.

5. The uniform electric near-field planar antenna system based on a metasurface structure according to claim 1, characterized in that: The annular sub-circuit board includes a first annular sub-circuit board (22), the insulating layer includes a first insulating layer (31), the solid sub-circuit board (21), the first insulating layer (31) and the first annular sub-circuit board (22) are nested in sequence from the inside out, the solid sub-circuit board (21) and the first annular sub-circuit board (22) are connected via a plurality of capacitors (4), and all of the capacitors (4) are arranged on the first insulating layer (31).

6. The uniform electric near-field planar antenna system based on a metasurface structure according to claim 4, characterized in that: The annular sub-circuit board comprises a first annular sub-circuit board (22) and a second annular sub-circuit board (23); the insulating layer comprises a first insulating layer (31) and a second insulating layer (32); the solid sub-circuit board (21), the first insulating layer (31), the first annular sub-circuit board (22), the second insulating layer (32), and the second annular sub-circuit board (23) are nested in sequence from the inside out; the solid sub-circuit board (21) and the first annular sub-circuit board (22) as well as the first annular sub-circuit board (22) and the second annular sub-circuit board (23) are connected via a plurality of capacitors, and the capacitors are provided on the first insulating layer (31) and the second insulating layer (32).

7. The uniform electric near-field planar antenna system based on a metasurface structure according to claim 1, characterized in that: The uniform electric near-field flat panel antenna system is used to detect the electromagnetic interference resistance of the object to be tested (6).

8. The uniform electric near-field planar antenna system based on a metasurface structure according to claim 7, characterized in that: The object to be measured (6) is a gas meter.

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