WIFI dual-frequency ceramic antenna based on graphene material

Abstract

The utility model discloses a WIFI double-frequency ceramic antenna based on graphene materials, which comprises a ceramic substrate and a plurality of graphene patches, and the graphene patches are arranged on the ceramic substrate to form a main body part of the antenna to be connected with a peripheral matching circuit. A first patch, a second patch, a third patch, a fourth patch, a fifth patch and a sixth patch are respectively arranged on the upper surface and the lower surface of the ceramic substrate along the horizontal direction; a seventh patch and an eighth patch are arranged on the left side face and the right side face of the ceramic substrate respectively. The first patch, the second patch, the third patch, the fourth patch, the fifth patch and the sixth patch are all graphene patches. Therefore, the graphene material patch is designed into a stub coupling resonance structure, a WIFI or Bluetooth antenna with multiple frequency bands, a wide working frequency band, light weight and miniaturization is easier to design, and the basic performance index of an antenna product is ensured. Under the condition of the same ceramic dielectric material, the physical structure size of the ceramic substrate can be reduced by 20%.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, and in particular to a WIFI dual-frequency ceramic antenna mainly used in various miniaturized IOT devices or wearable devices. Background Art

[0002] With the continuous development of wireless communication technology, the increasing maturity of 5G technology, and the increasingly widespread application of Bluetooth and WiFi technology, people have put forward higher requirements for the use of miniaturized, intelligent, and portable electronic products, which has promoted the rapid development of the market for IOT technology and wearable devices. In recent years, it has become a market with great potential. As countless companies are committed to the construction of the Internet of Things and the research and development of wearable devices, people's requirements for them have become more and more stringent. Miniaturization is one of the most important factors in all IOT devices and wearable devices. How to reduce the size of wireless devices as much as possible to achieve miniaturization while ensuring the basic performance of existing wearable devices has become one of the main problems restricting the development of current wireless devices.

[0003] With the continuous development of Moore's Law, the physical size of chips is also decreasing. The rapid development of integrated circuits has provided a solid technical foundation for the development of wearable devices. By integrating circuits into chips, the size of the entire product can be continuously reduced to meet people's demand for miniaturized electronic products. In order to meet the requirements of circuit miniaturization in wireless communications, reducing the physical size of the antenna has become an urgent problem to be solved. As a bridge for wireless communication to communicate with the outside world, the physical size of the antenna is usually proportional to the operating frequency. The physical size of the antenna required for a lower antenna operating frequency band is relatively large. Exploring how to achieve miniaturization of WIFI antennas while improving the working performance of the antenna has become a hot research direction. The use of graphene material antenna structure can further reduce the size of the antenna, such as a flexible conformable graphene dual-band WiFi antenna disclosed in patent CN202210962060.6, etc. However, the current application of graphene materials in such WIFI antennas is still at a relatively low level, and the structural design of graphene material components is not reasonable, which weakens its effect in reducing the size of the antenna, and too much reduction will affect the performance of the antenna itself. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a WIFI dual-band ceramic antenna based on graphene material with a more reasonable structural design, which can significantly reduce the antenna size and ensure the antenna performance, in view of the defect that the existing graphene WIFI antenna has an insignificant reduction in antenna size due to the unscientific and unreasonable structural design of the graphene components.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a WIFI dual-band ceramic antenna based on graphene material, comprising a ceramic substrate and a plurality of graphene patches, wherein the graphene patches are arranged on the ceramic substrate to form a main body of the antenna connected to a peripheral matching circuit; the peripheral matching circuit comprises a metal ground plate, a metal transmission line and an impedance matching circuit, wherein the impedance matching circuit is connected to the metal ground plate, and the metal transmission line is connected between the impedance matching circuit and the main body of the antenna, and is characterized in that: a first patch and a second patch are arranged in a horizontal direction on the upper surface of the ceramic substrate, the first patch and the second patch are separated from each other and are respectively adjacent to the left and right side edges of the ceramic substrate; The lower surface of the ceramic substrate is horizontally provided with a third patch, a fourth patch, a fifth patch and a sixth patch, the third patch and the fifth patch are located on the same side of the ceramic substrate but are separated from each other, the fourth patch is located in the middle area of ​​the lower surface of the ceramic substrate and is adjacent to the third patch, the sixth patch is located on the other side of the ceramic substrate and is separated from the other three patches on the lower surface of the ceramic substrate; the seventh patch and the eighth patch are respectively arranged on the left and right sides of the ceramic substrate, the first patch and the fifth patch are electrically connected to each other through the seventh patch, and the second patch and the sixth patch are electrically connected to each other through the eighth patch; the first patch, the second patch, the third patch, the fourth patch, the fifth patch and the sixth patch are all graphene patches.

[0006] Furthermore, the first patch, the second patch, the third patch, the fourth patch, the fifth patch and the sixth patch are all rectangular graphene patches, and the seventh patch and the eighth patch are rectangular metal patches or rectangular graphene patches.

[0007] Furthermore, the graphene patches on the upper and lower surfaces of the ceramic substrate correspond to each other to form a structure with mutual coupling characteristics, and the corresponding electrical lengths are respectively reflected in the low-frequency 2400-2480MHz band and the high-frequency 5150-5850MHz band.

[0008] Furthermore, the first patch and the fifth patch form a group of branches, and the second patch and the sixth patch form a group of branches, which respectively correspond to adjusting two different high and low frequency bands of WIFI, namely the low frequency 2400-2480MHz band and the high frequency 5150-5850MHz band.

[0009] Furthermore, the third patch and the fourth patch form an L-shaped feeding end, which transmits electromagnetic energy to two branch coupling pairs through branch coupling, and forms a resonance effect on the branch coupling pairs to achieve electromagnetic energy radiation effects in the corresponding high and low frequency bands.

[0010] Furthermore, the impedance matching circuit includes a metal transmission line, a FR4 dielectric board and a π-type impedance matching circuit, the ceramic substrate is arranged on the FR4 dielectric board, the metal transmission line and the FR4 dielectric board are arranged on the metal grounding plate; the π-type impedance matching circuit is connected between the metal transmission line and the metal grounding plate.

[0011] Furthermore, the gap size for welding the RLC electronic components in the π-type impedance matching circuit does not exceed the length of 2 mm and the width of 1 mm of the 0201 model RLC electronic components.

[0012] Furthermore, the length and width of the first patch and the second patch, as well as the fifth patch and the sixth patch are inconsistent, so that the impedance characteristics of the antenna can be changed and optimized within a certain range by adjusting the length and width of the corresponding patches, so that the working frequency band of the antenna can be adjusted accordingly.

[0013] Furthermore, a gap structure is provided between the left and right sides of the ceramic substrate and the metal ground plate for installing a first RLC patch element and a second RLC patch element, and the first RLC patch element and the second RLC patch element are connected to the ceramic substrate through a first metal connecting wire and a second metal connecting wire, respectively, for adjusting the two frequency bands of the WIFI dual-band antenna. Similarly, the size of the gap structure shall not be greater than the physical length of the 0201 model RLC electronic component.

[0014] Furthermore, the size of the ceramic substrate does not exceed 3.2 mm×1.6 mm×0.5 mm, achieving a reduction of the physical size of the antenna by about 20%.

[0015] The utility model uses graphene material patches to design a branch-coupled resonant structure, which makes it easier to design a multi-band, wide operating frequency band, light weight, miniaturized WIFI or Bluetooth antenna, and ensures the basic performance indicators of the antenna product, so it has the characteristics of simple structure, easy processing, light weight, stable performance, small physical size, etc. Under the same ceramic dielectric material, the physical structure size of the ceramic substrate can be reduced to 3.2mm×1.6mm×0.5mm, a 20% reduction in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the main part of the antenna of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the ceramic substrate of the utility model;

[0019] Figure 4 This is a schematic structural diagram of the ceramic substrate of the utility model from another angle;

[0020] Figure 5 This is a simulation result diagram of reflection coefficient and frequency change of the utility model;

[0021] Figure 6 This is a simulation result diagram of the standing wave ratio coefficient and frequency change of the utility model;

[0022] Figure 7 This is the EH plane radiation pattern corresponding to 2.45GHz of the utility model;

[0023] Figure 8 This is the EH plane radiation pattern corresponding to 5.5GHz of the utility model;

[0024] Fig. 9 The 3D radiation pattern of the utility model at 2.45 GHZ;

[0025] Fig.10 This is the 3D radiation pattern of the utility model at 5.5 GHZ.

[0026] In the figure, 1 is a ceramic substrate, 21 is a first patch, 22 is a second patch, 23 is a third patch, 24 is a fourth patch, 25 is a fifth patch, 26 is a sixth patch, 27 is a seventh patch, 28 is an eighth patch, 3 is a metal transmission line, 4 is a π-type impedance matching circuit, 51 is a first RLC patch element, 52 is a second RLC patch element, 61 is a first metal connecting line, 62 is a second metal connecting line, 7 is a FR4 dielectric board, and 8 is a metal grounding board. DETAILED DESCRIPTION

[0027] In this embodiment, refer to Figure 1-Figure 4The WIFI dual-band ceramic antenna based on graphene material includes a ceramic substrate 1 and a plurality of graphene patches, namely a first patch 21, a second patch 22, a third patch 23, a fourth patch 24, a fifth patch 25 and a sixth patch 26. The graphene patches are arranged on the ceramic substrate 1 to form a main part of the antenna connected to a peripheral matching circuit; the peripheral matching circuit includes a metal ground plate 8, a metal transmission line 3 and an impedance matching circuit, the impedance matching circuit is connected to the metal ground plate 8, and the metal transmission line 3 is connected between the impedance matching circuit and the main part of the antenna; the first patch 21 and the second patch 22 are arranged on the upper surface of the ceramic substrate 1 in a horizontal direction, and the first patch 21 and the second patch 22 are separated from each other and are respectively adjacent to the ceramic The left and right side edges of the substrate 1; a third patch 23, a fourth patch 24, a fifth patch 25 and a sixth patch 26 are arranged on the lower surface of the ceramic substrate 1 in a horizontal direction, the third patch 23 and the fifth patch 25 are located on the same side of the ceramic substrate 1 but are separated from each other, the fourth patch 24 is located in the middle area of ​​the lower surface of the ceramic substrate 1 and is adjacent to the third patch 23, the sixth patch 26 is located on the other side of the ceramic substrate 1 and is separated from the other three patches on the lower surface of the ceramic substrate 1; a seventh patch 27 and an eighth patch 28 are respectively arranged on the left and right side surfaces of the ceramic substrate 1, the first patch 21 and the fifth patch 25 are electrically connected to each other through the seventh patch 27, and the second patch 22 and the sixth patch 26 are electrically connected to each other through the eighth patch 28.

[0028] The first patch 21 , the second patch 22 , the third patch 23 , the fourth patch 24 , the fifth patch 25 and the sixth patch 26 are all rectangular graphene patches, and the seventh patch 27 and the eighth patch 28 are rectangular metal patches (or rectangular graphene patches).

[0029] The graphene patches on the upper and lower surfaces of the ceramic substrate 1 correspond to each other to form a structure with mutual coupling characteristics, and the corresponding electrical lengths are respectively reflected in the low-frequency 2400-2480MHz band and the high-frequency 5150-5850MHz band. The electrical length refers to different frequencies corresponding to different wavelengths, and the waveguide wavelength corresponding to different media is called the electrical length.

[0030] The first patch 21 and the fifth patch 25 form a group of branches, and the second patch 22 and the sixth patch 26 form a group of branches, which correspond to the two different high and low frequency bands of WIFI, namely the low frequency 2400-2480MHz band and the high frequency 5150-5850MHz band. Usually, the length of the branch corresponds to one quarter of the waveguide wavelength of the frequency band, which is the so-called electrical length. In this way, the electromagnetic wave can produce resonance of the corresponding frequency on the branch. For example, if the 2400-2480 frequency band is low, the corresponding wavelength will be longer, and the corresponding electrical length will also be longer, and vice versa for the high frequency part. Therefore, the corresponding frequency band can be adjusted by adjusting the length of the branch.

[0031] The third patch 23 and the fourth patch 24 form an L-shaped feeding end, which transmits electromagnetic energy to two branch coupling pairs through branch coupling, and forms a resonance effect on the branch coupling pairs to achieve the electromagnetic energy radiation effect in the corresponding high and low frequency bands.

[0032] The impedance matching circuit includes a metal transmission line, a FR4 dielectric board 7 and a π-type impedance matching circuit 4. The ceramic substrate 1 is arranged on the FR4 dielectric board 7, and the metal transmission line and the FR4 dielectric board are arranged on a metal grounding plate 8; the π-type impedance matching circuit 4 is connected between the metal transmission line and the metal grounding plate 8.

[0033] The gap size for welding the RLC electronic components in the π-type impedance matching circuit 4 does not exceed the length of 2 mm and the width of 1 mm of the 0201 type RLC electronic components.

[0034] The length and width of the first patch 21 and the second patch 22, as well as the fifth patch 25 and the sixth patch 26 are inconsistent, so that the impedance characteristics of the antenna can be changed and optimized within a certain range by adjusting the length and width of the corresponding patches, so that the working frequency band of the antenna can be adjusted accordingly.

[0035] A gap structure is provided between the left and right sides of the ceramic substrate 1 and the metal ground plate 8 for installing the first RLC patch element 51 and the second RLC patch element 52. The first RLC patch element 51 and the second RLC patch element 52 are connected to the ceramic substrate 1 through the first metal connecting wire 61 and the second metal connecting wire 61, respectively, for adjusting the two frequency bands of the WIFI dual-band antenna. Similarly, the size of the gap structure shall not be greater than the physical length of the 0201 model RLC electronic component.

[0036] The size of the ceramic substrate 1 does not exceed 3.2 mm×1.6 mm×0.5 mm, which reduces the physical size of the antenna by about 20%.

[0037] like Figure 5 and Figure 6 As shown, the 3D structure of the antenna model proposed in the utility model is simulated using ANSYS high-frequency electromagnetic simulation software HFSS, and corresponding reflection coefficient and standing wave ratio coefficient curves varying with frequency are obtained. The working bandwidth is 180 MHz in the low frequency band of 2340 MHz-2520 MHz, and 490 MHz in the high frequency band of 5130-5620 MHz, which can obviously meet the basic engineering requirements of WIFI antennas and Bluetooth antennas.

[0038] like Figure 7As shown, it shows three radiation profiles of the electric field E-plane and H-plane of the WIFI antenna in the 2500MHz frequency band in the maximum radiation direction, mainly showing the gain value of the antenna in the radiation direction, and information on the energy radiation direction. The figure shows the performance of the low-frequency part corresponding to the WIFI antenna involved in the utility model in each radiation direction, which meets the basic engineering parameter requirements.

[0039] like Figure 8 As shown, it shows three radiation profiles of the electric field E-plane and H-plane of the WIFI antenna in the 5500MHz frequency band in the maximum radiation direction, mainly showing the gain value of the antenna in the radiation direction, and information on the energy radiation direction. The figure shows the performance of the high-frequency part corresponding to the WIFI antenna involved in the utility model in each radiation direction, which meets the basic engineering parameter requirements.

[0040] like Fig. 9 As shown, it shows the 3D radiation pattern of the WIFI dual-band antenna on its three-dimensional structure when the low frequency point is 2500MHz. It can be obviously found that the antenna proposed by the utility model has good radiation characteristics, and the gain value is about 1.39dBi, which meets the basic engineering parameter requirements.

[0041] like Fig.10 As shown, it shows the 3D radiation pattern of the WIFI dual-band antenna on its three-dimensional structure when the low frequency point is 2500MHz. It can be obviously found that the antenna proposed by the utility model has good radiation characteristics, and the gain value is about 3.40dBi, which meets the basic engineering parameter requirements.

[0042] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A WIFI dual-band ceramic antenna based on graphene material, comprising a ceramic substrate and a plurality of graphene patches, wherein the graphene patches are arranged on the ceramic substrate to form a main part of the antenna connected to a peripheral matching circuit; the peripheral matching circuit comprises a metal ground plate, a metal transmission line and an impedance matching circuit, wherein the impedance matching circuit is connected to the metal ground plate, and the metal transmission line is connected between the impedance matching circuit and the main part of the antenna, characterized in that: A first patch and a second patch are arranged horizontally on the upper surface of the ceramic substrate, the first patch and the second patch are separated from each other and are respectively adjacent to the left and right side edges of the ceramic substrate; a third patch, a fourth patch, a fifth patch and a sixth patch are arranged horizontally on the lower surface of the ceramic substrate, the third patch and the fifth patch are located on the same side of the ceramic substrate but are separated from each other, the fourth patch is located in the middle area of ​​the lower surface of the ceramic substrate and is adjacent to the third patch, and the sixth patch is located on the other side of the ceramic substrate and is separated from the other three patches on the lower surface of the ceramic substrate; a seventh patch and an eighth patch are respectively arranged on the left and right side surfaces of the ceramic substrate, the first patch and the fifth patch are electrically connected to each other through the seventh patch, and the second patch and the sixth patch are electrically connected to each other through the eighth patch; the first patch, the second patch, the third patch, the fourth patch, the fifth patch and the sixth patch are all graphene patches.

2. The WIFI dual-band ceramic antenna based on graphene material according to claim 1, characterized in that: The first patch, the second patch, the third patch, the fourth patch, the fifth patch and the sixth patch are all rectangular graphene patches, and the seventh patch and the eighth patch are rectangular metal patches or rectangular graphene patches.

3. The WIFI dual-band ceramic antenna based on graphene material according to claim 1 or 2, characterized in that: The graphene patches on the upper and lower surfaces of the ceramic substrate correspond to each other to form a structure with mutual coupling characteristics, and the corresponding electrical lengths are respectively reflected in the low-frequency 2400-2480MHz band and the high-frequency 5150-5850MHz band.

4. The WIFI dual-band ceramic antenna based on graphene material according to claim 3, characterized in that: The first patch and the fifth patch form a group of branches, and the second patch and the sixth patch form a group of branches, which correspond to adjusting two different high and low frequency bands of WIFI, namely the low frequency 2400-2480MHz band and the high frequency 5150-5850MHz band.

5. The WIFI dual-band ceramic antenna based on graphene material according to claim 4, characterized in that: The third patch and the fourth patch form an L-shaped feeding end, which transmits electromagnetic energy to two branch coupling pairs through branch coupling, and forms a resonance effect on the branch coupling pairs to achieve the electromagnetic energy radiation effect in the corresponding high and low frequency bands.

6. The WIFI dual-band ceramic antenna based on graphene material according to claim 5, characterized in that: The impedance matching circuit includes a metal transmission line, a FR4 dielectric board and a π-type impedance matching circuit. The ceramic substrate is arranged on the FR4 dielectric board. The metal transmission line and the FR4 dielectric board are arranged on a metal grounding plate. The π-type impedance matching circuit is connected between the metal transmission line and the metal grounding plate.

7. The WIFI dual-band ceramic antenna based on graphene material according to claim 6, characterized in that: The size of the gap used for welding the RLC electronic components in the π-type impedance matching circuit does not exceed the length of 2 mm and the width of 1 mm of the 0201 type RLC electronic components.

8. The WIFI dual-band ceramic antenna based on graphene material according to claim 1 or 2, characterized in that: The length and width of the first patch and the second patch, as well as the fifth patch and the sixth patch are inconsistent, so that the impedance characteristics of the antenna can be changed and optimized within a certain range by adjusting the length and width of the corresponding patches, so that the working frequency band of the antenna can be adjusted accordingly.

9. The WIFI dual-band ceramic antenna based on graphene material according to claim 1, characterized in that: A gap structure is respectively arranged between the left and right sides of the ceramic substrate and the metal ground plate for installing the first RLC patch element and the second RLC patch element. The first RLC patch element and the second RLC patch element are respectively connected to the ceramic substrate through a first metal connecting wire and a second metal connecting wire for adjusting the two frequency bands of the antenna; the size of the gap structure is not greater than the physical length of the 0201 model RLC electronic component.

10. The WIFI dual-band ceramic antenna based on graphene material according to claim 1, characterized in that: The size of the ceramic substrate does not exceed 3.2 mm × 1.6 mm × 0.5 mm.

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