WO2019024352A1

WO2019024352A1 - Graphene-based pattern reconfigurable antenna

Info

Publication number: WO2019024352A1
Application number: PCT/CN2017/114049
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: CN107546473A

Abstract

The present invention provides a graphene-based pattern reconfigurable antenna, comprising an excitation source provided on the upper surface of a dielectric slab, two parasitic branch patches, and a dipole antenna; the graphene-based pattern reconfigurable antenna 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; the two parasitic branch patches are respectively provided at left and right ends of the first central axis, and the two parasitic branch patches are both perpendicular to the second central axis; the dipole antenna is provided on the first central axis, and the excitation source is provided at the intersection of the first central axis and the second central axis. The graphene-based pattern reconfigurable antenna of the present invention can implement the reconfiguration of a pattern.

Description

Graphene-based pattern reconfigurable antenna

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

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 reconfigurable antenna. The excellent photoelectric efficiency of graphene can be used to reconstruct the 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-reconfigurable antenna based on a graphene, which aims to solve the technical problem in the prior art that the reconstruction of the graph 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 pattern reconfigurable antenna, comprising an excitation source disposed on a surface of a dielectric board, two parasitic patch patches, and a dipole antenna. among them:

[0005] The graphene-based pattern reconfigurable antenna is bilaterally symmetric about a first central axis and is vertically symmetrical about a second central axis, the first central axis passing through a center of the dielectric plate and being perpendicular in direction a line connecting the directions, wherein the second central axis is a line passing through a center of the dielectric plate and in a horizontal direction;

[0006] Two parasitic branch patches are respectively disposed at the 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;

[0007] each parasitic patch patch includes a strip metal patch and two first graphene patches, each strip metal patch being divided into three segments by two first graphene patches; [0008] 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.

[0009] 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.

[0010] Preferably, the lengths of the head and the tail of each strip metal patch are equal.

[001 1] Preferably, the distance between the two parasitic patch patches is equal to the first central axis.

[0012] Preferably, the trapezoidal metal patch is an isosceles trapezoidal structure, and a width of an upper bottom of the trapezoidal metal patch is equal to a width of the second graphene patch.

[0013] Preferably, the height of the first graphene patch is equal to the height of the second graphene patch.

[0014] Preferably, the width of the upper bottom of the trapezoidal metal patch is WP, the bottom is W ₂ , and the height is L _{1 ;} the first graphene patch has a height of w ₃ and a width of w ₄ . 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.

Advantageous effects of the invention

Beneficial effect

[0015] Compared with the prior art, the graphene-based reconfigurable antenna of the present invention can realize the change of the chemical potential on the first graphene patch in the left and right parasitic patch patches. The reconstruction of the pattern facilitates the switching of the communication system in the direction of signal reception or transmission.

Brief description of the drawing

DRAWINGS

1 is a schematic structural view of a preferred embodiment of an antenna reconfigurable graphene-based pattern according to the present invention.

2 is a schematic diagram of S-parameter results of simulating the reflection coefficient of the antenna by the electromagnetic simulation software of the graphene-based reconfigurable antenna of the present invention.

3 is a diagram of a graphene-based reconfigurable antenna of the present invention, which is simulated by an electromagnetic simulation software.

Schematic diagram of the direction of the Y plane. 4 is a diagram of a graphene-based reconfigurable antenna of the present invention, which is simulated by an electromagnetic simulation software.

Schematic diagram of the direction of the face.

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 schematic view showing the structure of a preferred embodiment of a graphene-based reconfigurable antenna according to the present invention.

[0022] In the embodiment, the graphene-based pattern reconfigurable antenna 1 includes an excitation source 14 disposed on the upper surface of the dielectric plate 10, two parasitic patch patches 20, and a dipole antenna 30. .

[0023] 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.

[0024] The graphene-based pattern reconfigurable antenna 1 is symmetrical about the first central axis (the ab line in FIG. 1) and is vertically symmetrical about the second central axis (the cd line in FIG. 1). The first central axis is a line in the antenna 1 reconfigurable by the graphene-based pattern that passes through the center of the dielectric plate 10 and is oriented in a vertical direction (ie, line ab in FIG. 1). The two central axes are the wires of the antenna 1 reconfigurable in the graphene-based pattern that pass through the center of the dielectric plate 10 and are oriented in a horizontal direction (ie, line cd in FIG. 1), the first central axis and the first The two central axes are perpendicular to each other.

[0025] 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.

[0026] 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 each second graphite The other end of the olefinic patch 15 is connected to an excitation source 14. The dipole antenna 30 is disposed on the first central axis, and the excitation source 14 is disposed at an intersection position of the first central axis and the second central axis (ie, a central position of the dielectric plate 10).

[0027] It should be noted that the first central axis and the second central axis are not metal-structured components that are reconfigurable in the graphene-based pattern, but are used for production or design. An element (for example, the excitation source 14, the two parasitic patch patches 20, and a dipole antenna 30) on the antenna 1 that can be reconstructed based on the graphene-based pattern is convenient for the user to be bilaterally symmetric about the first central axis. And symmetrical about the second central axis. When the graphene-based pattern reconfigurable antenna 1 operates, the central axis does not participate in any operation such as signal reception. In the present 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 reconfigurable based on the graphene-based pattern. Further, for convenience of explanation, FIG. 1 is also provided with an XYZ coordinate system, which can be seen from FIG. 1, and FIG. 1 is a cross-sectional view of the XY plane.

[0028] In the 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 .} , a width 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-shaped metal patch 11 in two craniocaudal The length of each segment, 1^ _2, is the length of the strip-shaped metal patch 11 after the removal of the head and tail segments and the first graphene patch 13).

[0029] 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 ₄ .

[0030] In the present embodiment, \¥ is 2 micrometers, \¥ ₂ is 6 micrometers, \¥ ₃ is 1.6 micrometers, \¥ ₄ is 2 micrometers, 22 micrometers, 1^ ₂ is 28.4 micrometers, 1^ ₃ is 21.2 microns and 1^ ₄ is 14.9 microns.

[0031] In the embodiment of the present invention, since the graphene patch 12 is used, the excellent electro-optical effect of graphene is utilized, and only a relatively low electric field is required to generate low chemical potential (as low as electron volts) for graphene. Dynamic adjustment of the antenna's pattern.

[0032] When the graphene-based pattern reconfigurable antenna 1 is connected to other communication devices, the signal transmission process is adjusted by adjusting the chemical potentials of the first graphene patch 13 and the second graphene patch 15 Medium loss, specifically, when the chemical potential of the first graphene patch 13 and the second graphene patch 15 is changed, The electrical conductivity of the graphene patch 13 and the second graphene patch 15 also changes, and the loss during signal transmission is adjusted by the change in conductivity, thereby affecting the lower cutoff frequency of the metal patch.

[0033] The graphene-based pattern reconfigurable antenna 1 of the present invention can realize the adjustment signal transmission by adding different chemical potentials on the first graphene patch 13 and the second graphene patch 15 Impedance and reactance in the process facilitate impedance matching between the system and the device. It should be noted that by applying different electric fields to the first graphene patch 13 (for example, a parallel plate which is capable of generating an electric field is disposed above each of the first graphene patches 13 and an electric field generated by the parallel plates) The chemical potential on the first graphene patch 13 is imparted so that a voltage is generated on the first graphene patch 13 to achieve a chemical potential imparted to the first graphene patch 13, and the second graphene patch 15 can be The second graphene patch 15 is imparted with a different chemical potential by feeding directly through the excitation source 14.

2 is a schematic diagram of S-parameter results of a graphene-based reconfigurable antenna emulating a 吋 reflection coefficient by an electromagnetic simulation software according to the present invention; FIG. 3 is a diagram of a graphene-based reconfigurable antenna passing through the graphene according to the present invention; The electromagnetic simulation software simulates the direction of the XOY plane of the crucible; FIG. 4 is a schematic diagram of the direction of the YOZ plane of the antenna reconstructed by the electromagnetic simulation software by the reconfigurable antenna of the graphene-based pattern of the present invention.

Specifically, when the chemical potential μ 第二 of the second graphene patch 15 on the dipole antenna 30 is set to 0.4 eV, the chemical potential of the second graphene patch 13 on the left side in FIG. 1 is set to 0.4eV, μ _ε3 of the second graphene patch 13 on the right side in FIG. 1 is set to 0 eV, and the left parasitic branch patch 20 is equivalent to a director (the second graphene patch 13 having a chemical potential of OeV) It is equivalent to letting the strip-shaped metal patch 11 be connected), and the parasitic branch patch 20 on the right is equivalent to a reflector (the second graphene patch 13 having a chemical potential of OeV is equivalent to letting the strip-shaped metal patch 11 be broken)幵 state), this 吋 based graphene-based pattern reconfigurable antenna 1 will radiate towards 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 in FIG. 1 is set to 0 eV, in FIG. The second graphene patch 13 on the right has a μ _ε3 of 0.4 eV, the left parasitic patch 20 is equivalent to a reflector, and the right parasitic patch 20 is equivalent to a director, which is based on graphene. The pattern of the reconfigurable antenna 1 will radiate in the second direction (D) ₂ .

[0036] It can be seen from FIG. 2 that the antenna 1 reconfigurable based on the graphene pattern has stable reflection coefficients in both cases (ie, the first direction radiation and the second direction radiation). In agreement). Figures 3 to 4 show a graph of a graphene-based reconfigurable antenna 1 at a frequency of 3.73 THZ, where The pattern of Figure 3 and Figure 4 is only different in both cases. That is, the reconstruction of the pattern (for example, the conversion of the first direction and the second direction) can be achieved by the change in the chemical potential on the first graphene patch 20 in the left and right parasitic patch patches 20, It 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 invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are 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 reconfigurable antenna of the present invention can realize the change of the chemical potential on the first graphene patch in the left and right two parasitic patch patches. The reconstruction of the pattern facilitates the switching of the communication system in the direction of signal reception or transmission.

Claims

Claim

A graphene-based pattern reconfigurable antenna, comprising: an excitation source disposed on a surface of a dielectric plate, two parasitic patch patches, and a dipole antenna, wherein: the graphene-based The pattern reconfigurable antenna is bilaterally symmetric about a first central axis and vertically symmetrical about a second central axis, the first central axis being a line passing through a center of the dielectric plate and oriented in a vertical direction, the second center The axis is a line passing through the center of the dielectric plate and the direction is a horizontal direction; two parasitic branch patches are respectively disposed at the left and right ends of the first central axis, and the two parasitic patch patches are respectively connected to the second central axis Vertically, the dipole antenna is disposed on the first central axis, and the excitation source is disposed at an intersection of the first central axis and the second central axis; each parasitic patch includes a strip of metal patch And two first graphene patches, each strip metal patch being divided into three segments by two first graphene patches; and the dipole antenna comprises two trapezoidal metal patches Two second graphene patches, wherein each trapezoidal metal patch on the bottom connected to one end of a second patch of the graphene, a second other end of each graphene patches are connected to the excitation source.

The graphene-based pattern reconfigurable antenna 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 pattern reconfigurable antenna according to claim 1, wherein the length of the head and the tail of each of the strip-shaped metal patches is equal.

The graphene-based pattern reconfigurable antenna of claim 1 wherein the two parasitic patch patches are equidistant from the first central axis.

The graphene-based pattern reconfigurable antenna according to claim 1, wherein the trapezoidal metal patch is an isosceles trapezoidal structure, and a width of the upper base of the trapezoidal metal patch is different from the first The two graphene patches have the same width.

The graphene-based pattern reconfigurable antenna according to claim 1, wherein a height of the first graphene patch is equal to a height of the second graphene patch. The graphene-based pattern reconfigurable antenna according to claim 1, wherein a width of the upper bottom of the trapezoidal metal patch is WP, a bottom is W ₂ , and a height is Height of the first patch of the graphene w _3, a width w _4, the column-like metallic patch width W _4, the height of _{_{_{2xW 3 + 2xL 3 + L 2}}} , the second graphene The width of the patch is WP height W ₃ , and the distance between each parasitic patch patch and the excitation source is L ₄ , where W ₁ is 2 micrometers, \¥ ₂ is 6 micrometers, and \¥ ₃ is 1.6 micrometers. \¥ ₄ is 2 microns, 22 microns, 1^ ₂ is 28.4 microns, 1^ ₃ is 21.2 microns and 1^ ₄ is 14.9 microns.