WO2012171294A1

WO2012171294A1 - Artificial microstructure and artificial electromagnetic material using same

Info

Publication number: WO2012171294A1
Application number: PCT/CN2011/081362
Authority: WO
Inventors: 刘若鹏; 栾琳; 寇超锋; 蒋楠楠
Original assignee: 深圳光启高等理工研究院; 深圳光启创新技术有限公司
Priority date: 2011-06-17
Filing date: 2011-10-27
Publication date: 2012-12-20
Also published as: CN103036032B; CN103036032A

Abstract

Provided in the present invention is an artificial microstructure, comprising: a first split-ring resonator (SRR) and a second SRR, said SRRs facing each other and being parallely disposed, and the second SRR being smaller than the first SRR. Two resonance peaks or multiple resonance peaks are obtained by means of the response of the large and small SRRs; thus, permeability within a certain frequency range changes slowly and smoothly starting from zero. That is, materials of a certain frequency band possess a low permeability. In addition, further disclosed in the present invention is an artificial electromagnetic material including said artificial microstructure.

Description

Artificial microstructure and artificial electromagnetic material thereof

This application claims priority to Chinese Patent Application No. 201110163730.X, filed on Jun. 17, 2011, entitled "Infrared Electromagnetic Material of Low Permeability", the entire contents of which are incorporated by reference. In this application. Technical field

This invention relates to a material, and more particularly to an artificial microstructure and an artificial electromagnetic material for its use. Background technique

Artificial electromagnetic materials, commonly known as metamaterials, are a new type of synthetic material consisting of a substrate made of a non-metallic material and a plurality of artificial microstructures attached to or embedded in the surface of the substrate. The substrate can be virtually divided into a plurality of square substrate units arranged in a rectangular array, and each of the substrate units is attached with an artificial microstructure to form a metamaterial unit, and the entire metamaterial is hundreds of thousands, millions or even hundreds of millions. Such a metamaterial unit is composed of crystals that are composed of a myriad of lattices in a certain arrangement. The artificial microstructures on each metamaterial unit are the same or not identical. The artificial microstructure is a cylindrical or flat wire constituting a certain geometric figure, for example, a wire forming a circular shape, a "work" shape, or the like.

Due to the existence of artificial microstructures, each metamaterial unit has an equivalent dielectric constant and equivalent magnetic permeability different from the substrate itself, so all metamaterials composed of metamaterial units exhibit special response characteristics to electric and magnetic fields. At the same time, the specific structure and shape of the artificial microstructure can be changed, and the equivalent dielectric constant and equivalent magnetic permeability of the unit can be changed, thereby changing the response characteristics of the entire metamaterial.

Natural materials, except for a few materials such as ferrite, have very high magnetic permeability. Most materials have a magnetic permeability equal to 1 or 1 ± 0.001, but almost no negative magnetic permeability or magnetic permeability is around 0. s material. However, in some electromagnetic applications, materials with low magnetic permeability, ie materials with a magnetic permeability in the range of 0 to 0.8, are necessary. Summary of the invention

The technical problem to be solved by the present invention is to provide an artificial microstructure having a low magnetic permeability and an artificial electromagnetic material to which it is applied in view of the above-mentioned drawbacks of the prior art. The present invention provides an artificial microstructure comprising two first open and parallel resonant ring and a second open resonant ring, the second open resonant ring being smaller than the first open resonant ring .

The second open resonant ring is located inside the annular orthographic projection of the first open resonant ring. The second open resonant ring is located in the middle of the annular orthographic projection of the first open resonant ring. The first open resonant ring is a near "concave" shaped open resonant ring, and the second open resonant ring is a near "mouth" shaped open resonant ring.

The first open resonant ring is a derivative structure of a near "concave" shaped open resonant ring, and the second open resonant ring is a derivative structure of a near "mouth" shaped open resonant ring.

The second open resonant ring includes a gem-shaped wire and two non-contiguous horizontal lines extending horizontally from the ends of the g-shaped wire, respectively, the first open resonant ring including a ""-shaped wire and Two non-contiguous horizontal lines extending horizontally from the ends of the glyph wire respectively, the first open resonant ring further comprising a vertical extending from the ends of the two horizontal lines toward the ring and the bottom of the wire shaped wire There are two parallel vertical lines with gaps.

The second open resonant ring is oriented the same as the opening of the first open resonant ring.

Both ends of the opening of the first open resonant ring extend toward the inside of the ring and do not intersect.

Both ends of the opening of the second open resonant ring extend toward the inside of the ring and do not intersect.

The artificial microstructure is made of wire.

The artificial microstructure is made of copper wire.

The artificial microstructure is made of silver wire.

The artificial microstructure is surrounded by a single wire.

Correspondingly, an embodiment of the present invention further provides an artificial electromagnetic material, comprising at least one material sheet layer, each material sheet layer comprising a sheet substrate and a plurality of the above-mentioned artificial microstructures, the first opening of the artificial microstructure The resonant ring and the second open resonant ring are respectively attached to the front surface of the substrate and the back surface of the substrate.

The first open resonant ring is arranged such that the row pitch and the column pitch of the array are equal to the row pitch and the column pitch of the second open resonant ring arranged in an array.

The line spacing and column spacing are less than or equal to one tenth of the wavelength of the incident electromagnetic wave responsive to the artificial electromagnetic material.

The substrate is made of ceramic. The substrate is made of polytetrafluoroethylene or epoxy.

The artificial electromagnetic material includes a plurality of layers of material that are superimposed.

The plurality of material sheets are stacked by any one of welding, riveting or bonding.

The artificial electromagnetic material embodying the artificial microstructure of the present invention and the application thereof has the following beneficial effects: The present invention realizes a double resonance peak or even a multi-resonance peak by the response of two open resonant rings, thereby realizing magnetic permeability in a certain frequency range. It is possible to achieve a smooth and slow change from zero, that is, a material having a low magnetic permeability in a certain frequency band. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a front structural view of an artificial electromagnetic material according to a preferred embodiment of the present invention;

Figure 2 is a rear structural view of the artificial electromagnetic material shown in Figure 1;

3 is a schematic structural view of one of the material units of the artificial electromagnetic material shown in FIG. 1; FIG. 4 is a simulation effect diagram obtained by simulating the material unit shown in FIG.

Figure 5 is a simulation effect diagram of another material unit. detailed description

The present invention relates to a low magnetic permeability artificial electromagnetic material comprising at least one sheet of material which, when having a plurality of layers of material, are stacked together in a direction perpendicular to their surface and passed through a certain package The process is for example:): it is made into a unitary component by means of early joining, riveting, bonding, and the like.

Referring to FIGS. 1 to 3 together, each of the material sheets includes a sheet substrate 1 and an artificial microstructure attached to the substrate 1. The substrate 1 is usually made of epoxy resin, polytetrafluoroethylene, ceramics, etc., and the artificial microstructure 2 is a planar structure having a certain geometric pattern composed of metal wires such as silver wires or copper wires. Each substrate 1 can be virtually divided into a plurality of rectangular parallelepiped meshes 10 of equal length and width, each mesh 10 having a thickness equal to the thickness of the substrate 1, and the length and width are not greater than ten wavelengths of incident electromagnetic waves to be responsive. One of the points. Each of the square-shaped grids 10 is a substrate unit, and each of the substrate units and the artificial microstructures 2 attached to the surface thereof constitute a material unit 11, and each of the material sheets can be regarded as These material units 11 are arrayed by the width of one material unit 11 as a line pitch and the length as a column pitch. The artificial microstructure 2 includes two first open resonant rings 2a and a second open resonant ring 2b disposed in parallel and parallel, and the second open resonant ring 2b is smaller than the first open 2 resonant ring. The first open resonant ring 2a and the second open resonant ring 2b are arranged in an array on the front and back sides of the substrate 1 at the same row pitch and column pitch. The line spacing of the first open resonant ring 2a (the second open resonant ring 2b) is two first open resonant rings 2a of the adjacent two rows of the first open resonant ring 2a (the second open resonant ring 2b) on the same column ( The distance between the center points of the second open resonant ring 2b) is similarly available.

The first and second open resonant rings 2a, 2b are opposed to each other, that is, they are respectively located within the front and back surfaces of the same substrate unit. Further, the first and second open resonant rings 2a, 2b are two open resonant rings of different sizes. The second open resonance ring 2b is open to the same direction as the opening of the first open resonance ring 2a.

The open resonant ring is an approximately annular structure surrounded by a single wire and having a certain distance between the starting end and the end to form an opening, which can achieve a resonance effect. The open resonant ring of the first open resonant ring 2a and the second open resonant ring 2b of the present invention are different in size, and therefore the resonance effects of the two are different, and the material unit 11 obtained by the combination can realize the negative magnetic permeability. effect.

As shown in FIG. 2, in the preferred embodiment, the second open resonant ring 2b is a near-port-shaped open-end resonant ring, including a g-shaped wire and two non-phases extending horizontally from the ends of the g-shaped wire respectively. Connected horizontal lines. As shown in FIG. 1, the first open resonant ring 2a is a near-concave-shaped open resonant ring, which includes, in addition to the glyph wire and two horizontal lines of the near-mouth-shaped open resonant ring, Two parallel vertical lines extending from the ends of the two transverse lines vertically into the ring and having a gap with the bottom of the glyph wire. That is, the vertical line extending downward does not reach the bottom of the glyph wire. The shapes of the first and second open resonant rings 2a, 2b may be interchanged, that is, the first open resonant ring 2a is a near "mouth" shaped open resonant ring, and the second open resonant ring 2b is a near "concave" open resonant ring.

Of course, the first and second open resonant rings 2a, 2b of the present invention are not limited to the above-mentioned near-concave-shaped, near-mouth-shaped open-end resonant ring, and may also be a derivative structure of the above-mentioned open resonant ring, for example, near concave The derivative structure of the glyph-shaped resonant ring is a structure composed of the open resonant ring and a metal wire extending from the end of the two vertical lines to the inside of the ring and not intersecting, and the derivation structure of the near-mouth-shaped open resonant ring The open resonant ring and a structure formed by arbitrarily extending and not intersecting metal wires from the ends of the two horizontal lines to the inside of the ring.

In the preferred embodiment, the second open resonant ring 2b of the near "mouth" shape is smaller than the near "concave" shape The first open resonant ring 2a is located inside the vertical projection of the first open resonant ring 2a perpendicular to the front surface of the substrate, that is, the second open resonant ring 2b is located inside the annular orthographic projection of the first open resonant ring 2a . As shown in Figure 3. Preferably, the second open resonant ring 2b is located in the middle of the vertical annular projection of the first open resonant ring 2a, i.e., the center points of the two coincide.

The invention utilizes the above two large and small open resonant rings, obtains two resonance peaks through two open resonant rings, changes the distance between the two resonant rings and adjusts the size of the two, and can control two resonances. The resonant strength and the resonant frequency of the peak, and thus the resonant peak obtained by one resonant ring and the resonant peak generated by the other resonant ring, can obtain a smooth continuous magnetic permeability from zero, that is, a material with low magnetic permeability. .

Taking the preferred embodiment as an example, when the incident electromagnetic wave frequency is 60-80 GHz, the width H of the material unit 11 is also 2.5 mm, and the length W of the material unit 11 is also the column spacing. 2.5mm, the artificial microstructure has a wire width of 0.1 mm and a wire thickness of 0.018 mm; wherein the first open resonant ring 2a has a size HI X W1 of 2.2 mm x 2.2 mm, and the sides are away from the side of the material unit 11 The wall distance dl is 0.15 mm, the distance from the bottom to the lower bottom surface of the material unit 11 is 0.15 mm, and the distance a between the two vertical lines is 0.5 mm; the size of the second open resonance ring 2b is H2 χ W2 is 1.5 mm x 1.5mm, the distance d2 between the two sides of the first open resonant ring 2a is 0.25mm, the bottom distance from the bottom to the first open resonant ring 2a is 0.25mm, and the distance between the two horizontal lines is 0.24mm. . Moreover, the substrate of the present invention is made of polytetrafluoroethylene, and the artificial microstructure is made of copper wire.

The simulation result of this material unit 11 is shown in Fig. 4, and Fig. 4 is the real part of the simulated magnetic permeability spectrum diagram, f. The magnetic permeability of the frequency band is the required magnetic permeability starting from zero and continuously changing smoothly to 1, f _{0 is} in the range of about 55 to 78 GHz, and the bandwidth is 25 GHz.

The f ₀ frequency band can be moved forward or backward by adjusting the size of the first or second open resonant ring 2a, 3b.

For example, in the above embodiment, the substrate material is made of polytetrafluoroethylene, and the artificial microstructure is made of copper wire, and the size of the material unit 11, the first open resonant ring 2a, and the relative positions of the two are not changed, that is, H, Wl, Hl, al, bl, dl are all unchanged, the line width is still 0.1mm, only the size of the second open resonant ring 2b is reduced, and the changed size is divided into W2=l.lmm, H2=l .lmm, a2=0.24mm, d2=0.45mm, b2=0.45mm.

The material unit 11 after the size change has a simulation result as shown in FIG. 5. As can be seen from Fig. 5, the frequency band f whose magnetic permeability starts from zero and changes slowly. It is 58~63GHz and the bandwidth is 5GHz. From this, it can be seen that reducing the size of the second open resonance ring 2b can narrow the bandwidth of the low magnetic permeability band. The first resonant peak shifts back and the second resonant peak advances.

Further, the sizes of the material unit 11 and the first and second open resonance rings 2a, 3b are also different depending on the frequency of the incident electromagnetic wave to be responded to. For example, when the frequency of the incident electromagnetic wave is reduced to 40 to 60 GHz, the length and width of the material unit 11 are preferably 4 mm, the size of the first open resonant ring 2a is 3.5 mm x 3.5 mm, and the size of the second open resonant ring 2b It is 2mm x 2mm.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the claims of the present invention are still within the scope of the present invention.

Claims

Rights request

An artificial microstructure comprising two first open and parallel resonant rings and a second open resonant ring, the second open resonant ring being smaller than the first open resonant ring.

2. The artificial microstructure of claim 1 wherein the second open resonant ring is located inside a circular orthographic projection of the first open resonant ring.

3. The artificial microstructure of claim 1 wherein the second open resonant ring is located in the middle of the annular orthographic projection of the first open resonant ring.

The artificial microstructure according to any one of claims 1 to 3, wherein the first open resonant ring is a near-concave-shaped open resonant ring, and the second open resonant ring is near "mouth" glyph opening resonant ring.

The artificial microstructure according to any one of claims 1 to 3, wherein the first open resonant ring is a derivation structure of a near-concave-shaped open resonant ring, and the second open resonance The ring is a derivative structure of the near-mouth "letter" open-end resonant ring.

6. The low-permeability artificial microstructure according to claim 5, wherein the second open resonant ring comprises a gem-shaped wire and two horizontally extending from the ends of the g-shaped wire, respectively. a non-contiguous horizontal line, the first open resonant ring includes a gem-shaped wire and two non-contiguous horizontal lines extending horizontally from the ends of the g-shaped wire respectively, the first open resonant ring further Included are two parallel vertical lines extending from the ends of the two transverse lines vertically into the ring and having a gap with the bottom of the glyph wire.

The artificial microstructure according to any one of claims 1 to 3, wherein the second open resonant ring has the same opening orientation as the first open resonant ring.

8. The artificial microstructure according to claim 1, wherein both ends of the opening of the first open resonant ring extend toward the inside of the ring and do not intersect.

9. The artificial microstructure according to claim 1, wherein both ends of the opening of the second open resonant ring extend toward the inside of the ring and do not intersect.

10. The artificial microstructure according to claim 1, wherein the artificial microstructure is made of a metal wire.

11. The artificial microstructure according to claim 10, wherein the artificial microstructure is made of copper wire.

The artificial microstructure according to claim 10, wherein the artificial microstructure is made of silver wire.

13. The artificial microstructure of claim 10, wherein the artificial microstructure is surrounded by a single wire.

An artificial electromagnetic material comprising at least one sheet of material, each sheet of material comprising a sheet substrate and a plurality of artificial microstructures according to any one of claims 1-14, said artificial microstructure The first open resonant ring and the second open resonant ring are respectively attached to the front surface of the substrate and the back surface of the substrate.

The artificial electromagnetic material according to claim 14, wherein the first open resonant ring is arranged in an array of row pitches and column pitches, and the second open resonant ring is arranged in an array of row pitches and columns. The spacing is equal.

16. The artificial electromagnetic material according to claim 14, wherein the line spacing and the column pitch are less than or equal to one tenth of a wavelength of an incident electromagnetic wave responsive to the artificial electromagnetic material.

The artificial electromagnetic material according to claim 14, wherein the substrate is made of ceramic.

The artificial electromagnetic material according to claim 14, wherein the substrate is made of polytetrafluoroethylene or epoxy.

19. The artificial electromagnetic material of claim 14, wherein the artificial electromagnetic material comprises a plurality of layers of material that are superimposed.

20. The artificial electromagnetic material according to claim 19, wherein the plurality of material sheets are stacked by any one of soldering, riveting or bonding.