CN210926346U - Quadralobe flower type electromagnetic wave polarization modulator based on super surface - Google Patents
Quadralobe flower type electromagnetic wave polarization modulator based on super surface Download PDFInfo
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- CN210926346U CN210926346U CN201922238090.9U CN201922238090U CN210926346U CN 210926346 U CN210926346 U CN 210926346U CN 201922238090 U CN201922238090 U CN 201922238090U CN 210926346 U CN210926346 U CN 210926346U
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Abstract
The utility model relates to a four-petal flower type electromagnetic wave polarization modulator based on super surface is carried out periodic arrangement by a plurality of polarization units at the coplanar and is formed. Each polarization unit has three layers, namely a surface metal resonance structure (1), a middle dielectric layer (2) and a bottom metal reflection film (3). The utility model discloses a bivalve flower type surpasses the surface, has realized converting the vertical incidence linear polarization ripples into the polariface and the perpendicular linear polarization back wave of incident wave polariface at broad frequency range high-efficiently. In addition, the relevant structural parameters of the electromagnetic wave polarization regulator are changed, so that the working frequency band of the electromagnetic wave polarization regulator can be moved. The utility model relates to a four-petal flower type electromagnetic wave polarization modulator has the advantage that the structure size is little and the conversion rate is high, can wide application in fields such as communication, sensing and radar.
Description
Technical Field
The invention belongs to the field of electromagnetic wave polarization regulation and control, and particularly relates to a super-surface-based four-petal flower type electromagnetic wave polarization regulator.
Background
Polarization is one of the most important characteristics of electromagnetic waves, and electromagnetic waves can be classified into linear polarized waves, elliptical polarized waves, circular polarized waves and the like according to different polarization states of the electromagnetic waves; the polarization state of the electromagnetic wave reflects the asymmetry of the vibration direction of the electric field relative to the propagation direction of the electromagnetic wave in the propagation process; since many singular phenomena of electromagnetic waves are related to the polarization state of electromagnetic waves, controlling the polarization state of electromagnetic waves is an important direction in scientific research.
As an artificial assembly material, the metamaterial has novel characteristics which are not possessed by a plurality of natural materials. The two-dimensional metamaterial, also called a super surface, not only retains the singular characteristics of the three-dimensional metamaterial, but also overcomes the difficulty in the preparation of the three-dimensional metamaterial. The super surface shows remarkable characteristics in the aspect of controlling electromagnetic wave propagation, and particularly in a microwave frequency band and an optical frequency band, polarization control research based on an anisotropic or chiral super surface has made great progress. Compared with the traditional polarization controller, the polarization controller based on the super surface has the characteristics of simple structure, flexible design, small size, light weight and the like, and can be processed by utilizing the existing mature standard printed circuit board process or photoetching process and the like, so researchers design and manufacture various different super surface electromagnetic wave polarization controllers.
At present, many existing reflective super-surface electromagnetic wave polarization controllers can only realize efficient polarization regulation and control on linear polarization electromagnetic waves of a fixed frequency band, but have poor regulation and control capability on linear polarization electromagnetic waves of other frequency bands, and cannot realize structural adjustability of the super-surface electromagnetic wave polarization controllers.
Disclosure of Invention
The invention provides a super-surface-based four-petal-shaped electromagnetic wave polarization regulator which can realize broadband electromagnetic wave polarization regulation and has structural adjustability.
The technical scheme adopted by the invention for solving the technical problems is as follows: a super-surface based electromagnetic wave polarization regulator with a four-petal pattern comprises a plurality of polarization units which are periodically arranged in the same plane.
Each polarization unit comprises a three-layer structure, namely a metal resonance structure on the surface layer, a middle dielectric layer and a metal reflection film on the bottom layer. The centers of the surface metal resonance structure, the middle dielectric layer and the bottom metal reflection film are positioned on the same vertical line.
The surface layer metal resonance structure is a four-petal flower type structure formed by splicing four metal concentric rings, the circle centers of the four metal concentric rings are positioned on two mutually vertical symmetry axes of the four-petal flower type structure, and the center of the surface layer four-petal flower type structure is the intersection point of the two symmetry axes; a rectangular gap is dug at the overlapped part of the four metal concentric rings, and the center of the rectangular gap is coincided with the center of the four-petal flower type structure. When the four metal concentric rings of the four-petal flower type structure are large enough, so that no gap exists around the center O of the structure after intersection, a rectangular gap can be directly dug in the overlapped part of the four metal concentric rings; when a gap exists around the center O of the structure after the four concentric metal rings of the four-petal flower type structure are intersected, firstly filling the gap with a metal material which is the same as the surface layer resonance structure, and then excavating a rectangular gap at the overlapped part of the four concentric metal rings; the rectangular gap can be horizontally placed or obliquely placed.
The geometric dimension of the bottom metal reflecting film is identical to that of the dielectric layer except the thickness.
Furthermore, the position of the working frequency band can be effectively changed by adjusting the structural parameters of the surface metal resonance structure.
Furthermore, the surface metal resonance structure and the bottom metal reflection film are both composed of copper foil.
Further, the dielectric layer is made of microwave dielectric materials, and the dielectric materials comprise an FR-4 glass cloth substrate and Taconic series dielectric materials; preferably, the dielectric material of Taconic series has a dielectric constant of 2 to 3 and a loss tangent of 0.0009 to 0.005.
Furthermore, when the polarization unit carries out period continuation, the number of the repeated units in the transverse direction and the longitudinal direction is the same, namely the formed periodic array structure is a square array.
The cross polarization reflectivity of the electromagnetic wave polarization regulator is defined as Ryx(ω)=|S1y,1x(ω)|2The homopolar reflectivity is defined as Rxx(ω)=|S1x,1x(ω)|2In which S is1y,1x(omega) and S1x,1xAnd (omega) is an S parameter.
The invention has the following beneficial effects: 1. the invention can convert the vertical incident linear polarized wave into the linear polarized reflected wave vertical to the incident wave polarization surface in a wider frequency range with higher conversion rate, and the invention also realizes the structural adjustability of the super-surface electromagnetic wave polarization regulator.
2. When the structural parameters of the invention are properly valued, the invention has the same polarization reflectivity R between 14.45GHz and 17.46GHzxxLess than 10%, cross-polarization reflectivity RyxMore than 90 percent, and the polarization regulation frequency band can move along with the size change of the surface layer metal resonance structure. The working frequency band of the invention can be adjusted by changing the structural parameters of the electromagnetic wave polarization regulator, and can be flexibly changed according to the actual requirements in engineering application.
3. The invention has light and thin volume, is easy to process and manufacture, and can be realized by utilizing the existing mature standard printed circuit board process, photoetching process and the like.
Drawings
FIG. 1 is a partial top view of the present invention.
Fig. 2 is a side view of the polarization unit structure of the present invention.
Fig. 3 is a top view of the polarization unit structure of the present invention.
Fig. 4 is a cross-polarization reflectance and a co-polarization reflectance graph of example 1 of the present invention.
Fig. 5 is a top view of the structure of the polarization unit of embodiment 2 of the present invention.
Fig. 6 is a cross-polarization reflectivity and a co-polarization reflectivity plot of example 2 of the present invention.
Fig. 7 is a top view of a polarization unit structure of embodiment 3 of the present invention.
Fig. 8 is a cross-polarization reflectivity and co-polarization reflectivity plot for example 3 of the present invention.
The reference signs are: 1-surface metal resonance structure; 2-intermediate dielectric layer; and 3, bottom metal reflecting film.
Detailed Description
The invention realizes high-efficiency electromagnetic wave polarization conversion in a wider frequency range by utilizing the quadralobe flower-shaped super-surface, and simultaneously can change the size of the structure to realize the movement of the working frequency band.
The invention is further illustrated by the following examples and figures:
the invention provides a quadralobe flower type electromagnetic wave polarization regulator based on a super surface, which is formed by periodically arranging a plurality of polarization units in the same plane, and the repeated number of periodic extension of the polarization units in the transverse direction and the longitudinal direction is the same.
Referring to fig. 2, each polarization unit has three layers, which are a surface metal resonance structure, a middle dielectric layer and a bottom metal reflection film. The cross section of the polarization unit is square, the transverse length is the same as the longitudinal length, and the side length P of the polarization unit is defined as the period length.
The surface metal resonance structure (1) is made of copper foil, and the thickness of the surface metal resonance structure is 0.017-0.035 mm.
As shown in fig. 3, the surface layer metal resonance structure is a four-petal flower-shaped structure formed by splicing four concentric metal rings, the centers of the four concentric metal rings are on two symmetrical axes which are perpendicular to each other and bisected in the four-petal flower-shaped structure, and the center O of the surface layer metal resonance structure is the midpoint of the symmetrical axes; if the concentric rings are large enough, so that no gap exists around the center of the structure after intersection, a rectangular structure with any angle can be directly dug at the overlapped part of the four concentric rings; if the concentric rings are small, so that gaps are left around the centers of the structures after intersection, the gaps can be filled with the same material as the surface layer resonance structure, and then the weights of the four concentric ringsA rectangular structure with any angle is dug out from the stacked part, and the rectangle can be obliquely arranged; outer radius dimension R of four metal concentric rings21-1.7 mm, and an inner radius dimension R1Is 0.5 to 1 mm. If the center O of the surface layer metal resonance structure is taken as the origin of coordinates, the coordinates of the centers of the four metal concentric rings are respectively O1（-1mm，1mm）、Ｏ2（1.5mm，1.5mm）、Ｏ3（1mm，-1mm）、Ｏ4(-1.5 mm ), the size of the center of the four concentric metal rings from the center O of the rectangle is | OO1｜、｜ＯＯ2｜、｜ＯＯ3｜、｜ＯＯ4| each of the four distances being 1.4 to 2.1mm in size; the size of the rectangular shape to be dug out is changed along with the change of the size of the metal concentric ring, the length L of the rectangular shape is 0.8-2 mm, and the width W of the rectangular shape is 0.8-1 mm.
In the invention, the working frequency band of the linear polarization regulator can be efficiently changed by changing the geometric parameters of the metal concentric ring and the rectangle.
The middle dielectric layer (2) is made of microwave dielectric material, such as one of FR-4 glass cloth substrate material and Taconic series substrate material, and the thickness of the middle dielectric layer is 1 mm; preferably, the dielectric constant of the Taconic series dielectric material is between 2 and 3, the loss tangent value is between 0.0009 and 0.005, and the side length of the intermediate dielectric layer (2) is the same as the period P of the polarized unit.
The bottom metal reflecting film (3) is made of one of metals which have high reflectivity and are not easy to oxidize, and the thickness of the bottom metal reflecting film is 0.017-0.035 mm.
Example 1
The thickness of the metal reflecting film arranged in the embodiment is 0.035mm, and the material is copper foil; the thickness of the dielectric layer is 1mm, the material is TLY-5 (lossy) in Taconic series, the dielectric constant is 2.2, and the loss tangent value is 0.0009; the thickness of the surface metal resonance structure is 0.035mm, and the material is still copper foil; the period P of the polarizing unit is 8mm, W is 0.5mm, R2＝1.5mm, R1＝0.7mm，｜ＯＯ1｜＝｜ＯＯ3｜＝2.1mm、｜ＯＯ2| OO 4 | 1.4 mm. At this time, the angle between the long side of the rectangle and the y-axis is 0 degree. In the case of the same-polarization reflectivity Rxx and the cross-polarization reflectivity Ryx of this embodiment, as shown in fig. 4, the cross-polarization reflectivity of the electromagnetic wave polarization modulator is greater than 90% between 14.45GHz and 17.46GHz, and the maximum value is 98.4%.
Example 2
The thickness of the metal reflecting film arranged in the embodiment is 0.035mm, and the material is copper foil; the thickness of the dielectric layer is 1mm, the material is TLY-9 (lossy) in Taconic series, the dielectric constant is 2.5, and the loss tangent value is 0.0019; the thickness of the surface metal resonance structure is 0.035mm, and the material is still copper foil. The unit structure has a period P of 8mm, L of 1.2mm, W of 0.8mm, and R2＝1.5mm， R1＝1mm，｜ＯＯ1｜＝｜ＯＯ3｜＝2.1mm、｜ＯＯ2｜＝｜ＯＯ4| 1.4 mm. At this time, the angle between the long side of the rectangle and the y-axis is 0 degrees, as shown in fig. 5. The co-polarized reflectivity Rxx and cross-polarized reflectivity Ryx of this embodiment, as shown in fig. 6; ryx, the frequency range of more than 90% is 13.28-16.02 GHz, and the maximum value is 96.8%; compared with the embodiment 1, the working frequency band of the embodiment 2 is changed from 14.45 GHz-17.46 GHz to 13.28-16.02 GHz, and compared with the embodiment 1, the working frequency band is shifted, and the structural adjustability of the super-surface electromagnetic wave polarization controller is realized.
Example 3
The thickness of the metal reflecting film arranged in the embodiment is 0.035mm, and the material is copper foil; the thickness of the dielectric layer is 1mm, the material is TLY-9 (lossy) in Taconic series, the dielectric constant is 2.5, and the loss tangent value is 0.0019; the thickness of the surface metal resonance structure is 0.035mm, and the material is still copper foil. The unit structure has a period P of 8mm, L of 0.6mm, W of 0.4mm, and R2＝1.5mm， R1＝1mm，｜ＯＯ1｜＝｜ＯＯ3｜＝2.1mm、｜ＯＯ2｜＝｜ＯＯ4| 1.4 mm. At this time, the angle between the long side of the rectangle and the y-axis is 40 degrees, as shown in fig. 7. The homopolar reflectivities Rxx and cross of this exampleCross-polarized reflectivity Ryx, as shown in FIG. 8; ryx, the frequency range of more than 90% is 13.28-16.02 GHz, and the maximum value is 96.8%; compared with embodiment 2, the rectangular gap can be horizontally arranged or obliquely arranged, and the electromagnetic wave polarization regulator can keep higher performance.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (8)
1. A quadralobe flower type electromagnetic wave polarization controller based on a super surface comprises a plurality of polarization units which are periodically arranged in the same plane; the method is characterized in that:
each polarization unit structure comprises three layers, namely a surface metal resonance structure (1), a middle dielectric layer (2) and a bottom metal reflection film (3); the surface layer metal resonance structure (1) is a four-petal flower type structure formed by splicing four metal concentric rings, the circle centers of the four metal concentric rings are positioned on two mutually vertical symmetry axes of the four-petal flower type structure, and the center of the surface layer four-petal flower type structure is the intersection point of the two mutually vertical symmetry axes; digging a rectangular gap at the overlapped part of the four metal concentric rings, wherein the center of the rectangular gap is superposed with the center of the four-petal flower type structure; the centers of the surface metal resonance structure, the middle dielectric layer and the bottom metal reflection film are positioned on the same vertical line.
2. The electromagnetic wave polarization regulator based on the quadrilaterals flower type of the super surface of claim 1, characterized in that: when the four metal concentric rings of the four-petal flower type structure are large enough, so that no gap exists around the center O of the structure after intersection, a rectangular gap can be directly dug in the overlapped part of the four concentric rings; when a gap is formed around the center O of the structure after the four concentric rings of the four-petal flower type structure are intersected, firstly filling the gap with a metal material which is the same as the surface layer resonance structure, and then excavating a rectangular gap at the overlapped part of the four concentric rings; the rectangular gap is horizontally arranged or obliquely arranged.
3. The electromagnetic wave polarization regulator based on the quadrilaterals flower type of the super surface of claim 1, characterized in that: the inner radius R of the metal concentric ring1The size is between 0.5 and 1mm, and the outer radius R2The size is 1-1.7 mm; the width of the rectangular gap is 0.8-1 mm, and the length of the rectangular gap is 0.8-2 mm; the working frequency band of the polarization regulator can be adjusted by adjusting the inner radius of the metal concentric circular ring and the size of the rectangle.
4. The electromagnetic wave polarization regulator based on the quadrilaterals flower type of the super surface of claim 1, characterized in that: the distance between the centers of the four concentric metal rings and the center O of the surface layer metal resonance structure is 1.4-2.1 mm.
5. The electromagnetic wave polarization regulator based on the quadrilaterals flower type of the super surface of claim 1, characterized in that: the intermediate dielectric layer may use an FR-4 glass cloth substrate and a Taconic series dielectric material.
6. The electromagnetic wave polarization regulator based on the quadrilaterals flower type of the super surface of claim 1, characterized in that: the surface metal resonance structure and the bottom metal reflection film can be made of gold, silver, copper, aluminum and other metals.
7. The electromagnetic wave polarization regulator of the super-surface-based quadralobe type as claimed in claim 1 and claim 2, wherein: the period P of the polarization unit is 7-9 mm; the thickness of the dielectric layer is 0.9-1.1 mm, and the thickness of the bottom metal reflecting film and the thickness of the surface metal resonance structure are 0.017-0.035 mm.
8. The electromagnetic wave polarization regulator of the super-surface-based quadralobe type as claimed in claim 1 and claim 2, wherein: and when viewed from the direction vertical to the plane of the dielectric layer, the number of the polarization units in the transverse direction and the longitudinal direction is equal, namely the formed periodic array is a square array.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112467399A (en) * | 2020-11-18 | 2021-03-09 | 厦门大学 | Positive-feed excitation multi-frequency-point novel circularly polarized millimeter wave broadband planar reflection array antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112467399A (en) * | 2020-11-18 | 2021-03-09 | 厦门大学 | Positive-feed excitation multi-frequency-point novel circularly polarized millimeter wave broadband planar reflection array antenna |
| CN112467399B (en) * | 2020-11-18 | 2021-12-28 | 厦门大学 | Positive-feed excitation multi-frequency-point novel circularly polarized millimeter wave broadband planar reflection array antenna |
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