WO2019024353A1

WO2019024353A1 - Graphene-based antenna system

Info

Publication number: WO2019024353A1
Application number: PCT/CN2017/114050
Authority: WO
Inventors: 曲美君; 邓力; 李书芳; 张贯京; 葛新科; 张红治
Original assignee: 深圳市景程信息科技有限公司
Priority date: 2017-08-04
Filing date: 2017-11-30
Publication date: 2019-02-07
Also published as: CN107565221A

Abstract

The present invention provides a graphene-based antenna system, comprising an antenna and two electric field generators; the electric field generators are provided above the antenna; the antenna comprises a dielectric slab, an excitation source provided on the upper surface of the dielectric slab, two parasitic branch patches, and a dipole antenna. The graphene-based antenna system is bilaterally symmetric about a first central axis and is longitudinally symmetric about a second central axis; the first central axis is a connection line passing through the center of the dielectric slab in the vertical direction, and the second central axis is a connection line passing through the center of the dielectric slab in the horizontal direction; each electric field generator is provided above a parasitic branch patch, and is used for generating an electric field and endowing the first graphene patch with a chemical potential. The graphene-based antenna system of the present invention can implement the reconfiguration of a pattern.

Description

Graphene-based antenna system

[0001] The present invention relates to the field of terahertz communication technologies, and in particular, to a graphene-based antenna system.

Background technique

[0002] In recent years, with the rapid development and wide application of satellite navigation and satellite communication, antennas as the front-end equipment of these systems, the performance indicators of the performance, for the performance of satellite communication handheld terminals and RFID readers Extremely important role. However, the existing antenna uses a metal patch to perform direction reconstruction. Due to the low photoelectric efficiency of the metal, a large feed network design is required to realize the antenna pattern reconfigurable. Therefore, it is necessary to design a graphene-based antenna system that utilizes the excellent photoelectric efficiency of graphene to realize the reconfigurable antenna pattern and reduce the complexity of the feed network.

technical problem

[0003] It is an object of the present invention to provide a graphene-based antenna system, which aims to solve the technical problem in the prior art that the reconstruction of the pattern based on the graphene element cannot be realized.

Problem solution

Technical solution

[0004] In order to achieve the above object, the present invention provides a graphene-based antenna system including an antenna and two electric field generators, wherein the electric field generator is disposed at an upper position on the antenna;

[0005] The antenna includes a dielectric plate, an excitation source disposed on a surface of the dielectric plate, two parasitic patch patches, and a dipole antenna, wherein:

[0006] The graphene-based antenna system is bilaterally symmetric about a first central axis and vertically symmetric about a second central axis, the first central axis being a line passing through a center of the dielectric plate and in a vertical direction. The second central axis is a line that passes through the center of the dielectric plate and is oriented in a horizontal direction;

[0007] Two parasitic branch patches are respectively disposed at left and right ends of the first central axis, the two parasitic patch patches are perpendicular to the second central axis, and the dipole antenna is disposed on the first central axis Upper, and the excitation source is disposed at an intersection of the first central axis and the second central axis;

[0008] Each parasitic patch patch includes a strip of metal patch and two first graphene patches, each strip of gold The patch is divided into three segments by two first graphene patches;

[0009] The dipole antenna includes two trapezoidal metal patches and two second graphene patches, wherein an upper bottom of each trapezoidal metal patch is connected to one end of a second graphene patch, The other end of each second graphene patch is connected to an excitation source;

[0010] Each electric field generator is disposed above a parasitic patch patch for generating an electric field and imparting a chemical potential to the first graphene patch.

[0011] Preferably, the graphene-based antenna system further includes a bracket for fixing the electric field generator to a position above the antenna.

[0012] Preferably, the dielectric plate is further provided with a connection hole, and the electric field generator is connected to the connection hole of the dielectric plate through the bracket.

[0013] Preferably, the dielectric plate has a thickness of Ιμηι and a dielectric constant of 3.8, and the dielectric plate is a circular transparent glass substrate.

[0014] Preferably, the lengths of the head and the tail of each strip metal patch are equal.

[0015] Preferably, the distance between the two parasitic patch patches and the first central axis is equal.

[0016] Preferably, the trapezoidal metal patch is an isosceles trapezoidal structure, and a width of an upper base of the trapezoidal metal patch is equal to a width of the second graphene patch.

[0017] Preferably, the height of the first graphene patch is equal to the height of the second graphene patch.

Width [0018] Preferably, the metal patch on the bottom of the trapezoid is lower bottom WP W _2, a height L _1; the height of the first patch of the graphene w _3, a width w _4, the The width of the strip metal patch is w ₄ , the height is ₂ ×W ₃ + ₂ ×L ₃ +L ₂ , the width of the second graphene patch is W, and the height is W ₃ , and each parasitic patch is patched and excited. The distance between the sources is L ₄ , where W ₁ is 2 μm, \¥ ₂ is 6 μm, W ₃ is 1.6 μm, \¥ ₄ is 2 μm, 1^ is 22 μm, and 1^ ₂ is 28.4 μm. 1 ^ ₃ and L ₄ 21.2 microns 14.9 microns.

[0019] Preferably, when the chemical potential μ _ε1 of the second graphene patch on the dipole antenna is not zero, the electric field generator above the second graphene patch on the left is energized to generate an electric field, and the second on the right The electric field generator above the graphene patch is not energized, and the antenna is radiated to the left;

[0020] When the chemical potential μ^ of the second graphene patch on the dipole antenna is not zero, the electric field generator above the second graphene patch on the right side is not energized, and the second graphene patch is on the left side. The electric field generator is energized and When an electric field is generated, the antenna radiates to the right.

Advantageous effects of the invention

Beneficial effect

[0021] Compared with the prior art, the graphene-based antenna system of the present invention can realize the reconstruction of the pattern by the change of the chemical potential on the first graphene patch in the left and right two parasitic patch patches. It facilitates the switching of the communication system in the direction of signal reception or transmission.

Brief description of the drawing

DRAWINGS

1 is a side view showing the structure of a graphene-based antenna system of the present invention.

2 is a top plan view showing a preferred embodiment of an antenna in a graphene-based antenna system of the present invention.

3 is a schematic diagram showing the result of simulating the reflection coefficient of the 吋 reflection coefficient by the electromagnetic simulation software of the graphene-based antenna system of the present invention.

4 is a schematic diagram showing the direction of the XOY plane of the bismuth based on the graphene-based antenna system of the present invention by electromagnetic simulation software.

5 is a schematic diagram showing the direction of the YOZ plane of the bismuth based on the graphene-based antenna system of the present invention by electromagnetic simulation software.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described in detail with reference to the preferred embodiments thereof. The following examples are illustrative of the invention, and the invention is not limited to the following examples.

Referring to FIG. 1, FIG. 1 is a side view showing the structure of a graphene-based antenna system of the present invention.

[0029] The graphene-based antenna system comprises an antenna 1 and two electric field generators 2, which are connected to the antenna 1 via a bracket 3. It should be noted that the bracket 3 is an insulating member. The bracket 3 is used to fix the electric field generator 2 above the antenna 1. Wherein, the distance of the bracket 3 can be adjusted such that the distance between the electric field generator 2 and the antenna 1 can be adjusted. In other embodiments, the bracket 3 may be omitted, and the electric field generator 2 may be disposed at a budget distance above the antenna 1. The electric field generator 2 is used to energize and generate an electric field. Referring to FIG. 2, FIG. 2 is a top plan view of a preferred embodiment of an antenna in a graphene-based antenna system of the present invention.

[0031] In the embodiment, the antenna 1 includes an excitation source 14 disposed on the upper surface of the dielectric plate 10, and two parasitic patch patches 20 (only one parasitic patch patch 20 is labeled in FIG. 1 and another parasitic The patch is not labeled) and a dipole antenna 30.

[0032] The dielectric plate 10 has a thickness of 1 μm and a dielectric constant of 3.8. The dielectric plate 10 is a transparent glass substrate, and the upper surface of the dielectric plate 10 is provided with a single layer structure in the form of a mixture of metal and graphene. In the present embodiment, the dielectric plate 10 has a circular structure.

[0033] The antenna 1 is bilaterally symmetrical about a first central axis (the ab line in FIG. 1), and about the second central axis

(The cd line in Figure 1) is symmetrical up and down. The first central axis is a line connecting the center of the dielectric plate 10 in the antenna 1 and perpendicular to the direction (ie, line ab in FIG. 1), and the second central axis is the antenna 1 A line passing through the center of the dielectric plate 10 and in a horizontal direction (i.e., line cd in Fig. 1), the first central axis and the second central axis are perpendicular to each other.

[0034] Each of the parasitic patch patches 20 is a metal and graphene hybrid structure, wherein each parasitic patch patch 20 includes a strip metal patch 11 and two first graphene patches 13 . Each of the strip-shaped metal patches 11 is divided into three segments by two first graphene patches 13, wherein the lengths of the head and the tail of each strip-shaped metal patch 11 are equal. Two parasitic branch patches 20 are respectively disposed at the left and right ends of the first central axis, and the two parasitic branch patches 20 are perpendicular to the second central axis, and the two parasitic branch patches 20 are The distances of the first central axes are equal.

[0035] The dipole antenna 30 is a mixed structure of metal and graphene. The dipole antenna 30 includes two trapezoidal metal patches 12 (ie, an isosceles trapezoidal metal patch) and two second graphene patches 15 , wherein the upper base and each of the trapezoidal metal patches 12 One end of the second graphene patch 15 is connected, and the other end of each of the second graphene patches 15 is connected to the excitation source 14. The dipole antenna 30 is disposed on the first central axis, and the excitation source 14 is disposed at an intersection of the first central axis and the second central axis (ie, the center position of the dielectric plate 10).

It should be noted that, the first central axis and the second central axis are not components of metal in the antenna 1 , but for the production or design, the user is convenient to use the components on the antenna 1 (for example) , excitation source 14, two parasitic patch patches 20 and a dipole antenna 30) about the first central axis left Right symmetrical and symmetrical about the second central axis. When the antenna 1 is operated, the central axis does not participate in any operation such as signal reception. In the embodiment, the first central axis and the second central axis are for the convenience of describing the left and right and upper and lower symmetrical structures of the antenna 1. Further, for convenience of explanation, FIG. 1 is also provided with an XYZ coordinate system. As can be seen from FIG. 1, FIG. 1 is a cross-sectional view of the XY plane.

In this embodiment, the width of the upper bottom of the trapezoidal metal patch 12 is WP, the width of the bottom is W ₂ , and the height is L _{1 ;} the height of the first graphene patch 13 is W ₃ , and the width is W _4, the width of the strip-shaped metal patch 11 is W is _3, the height of 2xW _₃ + 2xL ₃ + L _2, and of (wherein 1 ^ ₃ is a strip of metal patches 11 in each section two craniocaudal The length, 1^ ₂ is the length of the strip-shaped metal patch 11 after removing the head and tail segments and the first graphene patch 13).

[0038] Further, the width of the second patch 15 is graphene \ ¥, (i.e., equal to the width of the trapezoidal metal patch on the bottom 12), a height of W ₃ (i.e., the first The graphene patches 13 are of equal height). Further, the distance between each parasitic patch 20 and the excitation source 14 is L ₃ .

[0039] In the present embodiment, \¥ is 2 micrometers, \¥ ₂ is 6 micrometers, \¥ ₃ is 1.6 micrometers, \¥ ₄ is 2 micrometers,

It is 22 micrometers, 1^ ₂ is 28.4 micrometers, 1^ ₃ is 21.2 micrometers, and 1^ ₄ is 14.9 micrometers.

Further, the dielectric plate 10 is further provided with a connection hole 4, and the electric field generator 2 is connected to the connection hole 4 on the dielectric plate 10 through the bracket 3. In other embodiments, the connection hole may be disposed at an edge position of the dielectric sheet 10. It should be noted that if the bracket 3 is omitted, the connecting hole 4 is also omitted. Further, an electric field generator 2 is disposed above a parasitic branch patch 20, and when the electric field generator 2 generates an electric field 吋, the first graphene 13 is produced on the first graphene patch 13 due to the excellent electro-optical effect of the first graphene 13. Chemical potential (expressed in electron volts). In this embodiment, the electric field generator 2 is a parallel plate.

[0041] When the antenna 1 is connected to other communication devices, the loss of signal transmission is adjusted by adjusting the chemical potentials of the first graphene patch 13 and the second graphene patch 15, specifically, when As the chemical potential of the graphene patch 13 and the second graphene patch 15 changes, the electrical conductivity of the first graphene patch 13 and the second graphene patch 15 also changes, and the signal transmission is adjusted by the change in conductivity. Loss in the process, which in turn affects the lower cutoff frequency of the metal patch. In the embodiment of the present invention, since the graphene patch 12 is used, the excellent electro-optic effect of the graphene is utilized, and only a relatively low electric field is required to generate low chemical potential (as low as electron volts) for the graphene, so that the direction of the antenna can be realized. Dynamic adjustment of the graph. 3 is a schematic diagram showing the results of S-parameters for simulating the reflection coefficient of the graphene-based antenna system of the present invention by electromagnetic simulation software; FIG. 4 is a schematic diagram of the XO Y-plane of the graphene-based antenna system of the present invention simulated by electromagnetic simulation software. Schematic diagram of the direction; FIG. 5 is a schematic diagram of the direction of the YOZ plane of the graphene-based antenna system of the present invention simulated by the electromagnetic simulation software.

[0043] In the present embodiment, when the chemical potential μ _£1 of the second graphene patch 15 on the dipole antenna 30 is not zero, the electric field generator above the second graphene patch 13 on the left side of the antenna 1 2 energizing and generating an electric field, the electric field generator 2 above the second graphene patch 13 on the right side of the antenna 1 is not energized, then the antenna 1 is turned to the left (ie, the first direction)

(D) ,) radiation; when the chemical potential μ _ε1 of the second graphene patch 15 on the dipole antenna 30 is not zero, the electric field generator 2 above the second graphene patch 13 on the right side is not energized, left The electric field generator 2 above the second graphene patch 13 is energized and generates an electric field, and the antenna 1 is radiated toward the right side (second direction (D) ₂ ).

Specifically, when the chemical potential μ _ε1 of the second graphene patch 15 on the dipole antenna 30 is set to 0.4 eV (the excitation source 14 is directly powered), the second graphene on the left side of FIG. 1 is attached. Chemical potential of sheet 13 ^^ ₂

Set to 0.4 eV (ie, the electric field generator 2 above the second graphene patch 13 on the left is energized and generates an electric field), and the μ _ε3 of the second graphene patch 13 on the right side in FIG. 1 is set to OeV (ie, the right side) The electric field generator 2 above the two graphene patches 13 is not energized), and the parasitic branch patch 20 on the left side is equivalent to a director (the second graphene patch 13 having a chemical potential of OeV is equivalent to the strip metal) The patch 11 is in a connected state), and the parasitic branch patch 20 on the right side is equivalent to a reflector (the second graphene patch 13 having a chemical potential of OeV is equivalent to the state in which the strip-shaped metal patch 11 is broken). The antenna 1 will radiate in the first direction (D). When the chemical potential μ _ε1 of the second graphene patch 15 on the dipole antenna 30 is set to 0.4 eV, the chemical potential μ _ε2 of the second graphene patch 13 on the left side of FIG. 1 is set to OeV (ie, the left side) The electric field generator 2 above the second graphene patch 13 is not energized), and the μ _ε3 of the second graphene patch 13 on the right side in Fig. 2 is 0.4 eV (i.e., the electric field above the second graphene patch 13 on the right side occurs) The device 2 is energized and generates an electric field. The parasitic patch 20 on the left is equivalent to a reflector, and the parasitic patch 20 on the right is equivalent to a director. The antenna 1 will be oriented in the second direction (D) ₂ radiation.

[0045] It can be seen from FIG. 3 that the reflection coefficient of the antenna 1 in both cases (ie, the first direction radiation and the second direction radiation) is stable (the curves tend to be uniform). Figures 4 to 5 show a pattern of the antenna 1 at a frequency of 3.73 T Hz, wherein the patterns of Figures 3 and 4 are only different in orientation in both cases. That is, by changing the chemical potential on the first graphene patch 20 in the two parasitic patch patches 20, Realizing the reconstruction of the pattern (for example, the conversion of the first direction and the second direction) facilitates the switching of the communication system in the direction of signal reception or transmission.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the contents of the drawings may be directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Industrial applicability

Compared with the prior art, the graphene-based antenna system of the present invention can realize the reconstruction of the pattern by the change of the chemical potential on the first graphene patch in the left and right two parasitic patch patches. It facilitates the switching of the communication system in the direction of signal reception or transmission.

Claims

Claim

A graphene-based antenna system, comprising: an antenna and two electric field generators, wherein the electric field generator is disposed at an upper position on the antenna; the antenna includes a dielectric plate and is disposed on a surface of the dielectric plate An excitation source, two parasitic patch patches, and a dipole antenna, wherein: the graphene-based antenna system is bilaterally symmetric about a first central axis and vertically symmetric about a second central axis, the first central axis being a line passing through a center of the dielectric plate and in a direction perpendicular to the line, the second central axis being a line passing through a center of the dielectric plate and having a horizontal direction; two parasitic patch patches are respectively disposed on the first The left and right ends of the central axis, the two parasitic patch patches are perpendicular to the second central axis, the dipole antenna is disposed on the first central axis, and the excitation source is disposed on the first central axis and the second The intersection of the central axes; each parasitic patch includes a strip of metal patch and two first graphene patches, each strip of metal patch consisting of two The first graphene patch is divided into three segments; and the dipole antenna comprises two trapezoidal metal patches and two second graphene patches, wherein each of the trapezoidal metal patches has a top and a bottom One end of the second graphene patch is connected, and the other end of each second graphene patch is connected to the excitation source; and each electric field generator is disposed above a parasitic patch patch for generating an electric field and imparting The first graphene patch has a chemical potential.

The graphene-based antenna system according to claim 1, wherein the graphene-based antenna system further comprises a holder for fixing the electric field generator to a position above the antenna.

The graphene-based antenna system according to claim 2, wherein the dielectric plate is further provided with a connection hole, and the electric field generator is connected to the connection hole on the dielectric plate through a bracket.

The graphene-based antenna system according to claim 1, wherein the dielectric plate has a thickness of Ιμηι and a dielectric constant of 3.8, and the dielectric plate is a circular transparent glass substrate.

The graphene-based antenna system according to claim 1, wherein each of the strip-shaped metal patches has the same length of the head and the tail. The graphene-based antenna system according to claim 1, wherein the two parasitic branch patches are equidistant from the first central axis.

The graphene-based antenna system according to claim 1, wherein the trapezoidal metal patch is an isosceles trapezoidal structure, and a width of an upper base of the trapezoidal metal patch and the second graphene patch The width is equal.

The graphene-based antenna system according to claim 1, wherein a height of said first graphene patch is equal to a height of said second graphene patch.

The graphene-based antenna system according to claim 1, wherein a width of an upper base of the trapezoidal metal patch is WP, a bottom is W ₂ , and a height is L _{1 ;} the first graphene patch height W _3, a width W _4, the width of the strip-shaped metal patch is W _4, a height of _{_{_{2xW 3 + 2xL 3 + L 2}}} , the width of the second patch of the graphene Wi, height W ₃ , the distance between each parasitic patch and the excitation source is L ₄ , wherein, micron, \¥ ₂ is 6 micron, \¥ ₃ is 1.6 micron, \¥ ₄ is 2 micron, and 1^ is 22 micron. L ₂ is 28.4 μm, 1 ^ ₃ is 21.2 μm, and 1 ^ ₄ is 14.9 μm.

The graphene-based antenna system according to claim 1, wherein a chemical potential μ _ε1 of the second graphene patch on the dipole antenna is not zero, above the second graphene patch on the left side When the electric field generator is energized and generates an electric field, the electric field generator above the second graphene patch on the right side is not energized, then the antenna radiates to the left; when the chemical potential μ _ε1 of the second graphene patch on the dipole antenna is not Zero, the electric field generator above the second graphene patch on the right is not energized, and the electric field generator above the second graphene patch on the left is energized to generate an electric field, and the antenna radiates to the right.