KR20120068571A - Broadband metamaterial and control method of broadband metamaterial with controllable effective constitutive - Google Patents

Broadband metamaterial and control method of broadband metamaterial with controllable effective constitutive Download PDF

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KR20120068571A
KR20120068571A KR1020100130253A KR20100130253A KR20120068571A KR 20120068571 A KR20120068571 A KR 20120068571A KR 1020100130253 A KR1020100130253 A KR 1020100130253A KR 20100130253 A KR20100130253 A KR 20100130253A KR 20120068571 A KR20120068571 A KR 20120068571A
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South Korea
Prior art keywords
stripe
metamaterial
conductor pattern
dielectric substrate
passive element
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KR1020100130253A
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Korean (ko)
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김동호
김상원
최학근
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한국전자통신연구원
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Priority to KR1020100130253A priority Critical patent/KR20120068571A/en
Publication of KR20120068571A publication Critical patent/KR20120068571A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/16—Dielectric waveguides, i.e. without a longitudinal conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/08—Strip line resonators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0086—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single discontinuous metallic layer on an electrically insulating supporting structure, e.g. metal grid, perforated metal foil, film, aggregated flakes, sintering
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0088—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a plurality of shielding layers; combining different shielding material structure

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

PURPOSE: A broadband metamaterial and a parameter control method thereof are provided to control permittivity, permeability, and a refractive index using the metamaterial for expanding a frequency bandwidth. CONSTITUTION: A metamaterial(100) has a plate shape. The metamaterial is comprised of a dielectric substrate(101) and first and second conductor patterns(102,103) formed on the upper surface and the lower surface of the dielectric substrate. The dielectric substrate has a structure in which dielectric materials with different permittivity are laminated. The first conductor pattern which is formed with a stripe with a first width is formed on the upper surface. The second conductor pattern which is formed with a stripe with a second width is formed on the lower surface. The first width and the second width are able to have the same value.

Description

Broadband metamaterial and control method of broadband metamaterial with controllable effective constitutive}

The present invention relates to a metamaterial having a negative dielectric constant, permeability, and refractive index (hereinafter referred to as a parameter of a metamaterial) even in a natural state, and in particular, a metamaterial having a configuration capable of controlling the parameters of the metamaterial in a wide band and the It relates to a parameter control method of meta-materials.

The refractive index of a material is expressed as the square root of the product of permittivity and permeability, and in nature it is common for the refractive index of a material to have a positive value. On the other hand, the meta-material refers to a material having a negative dielectric constant or permeability in a specific frequency range.

The method of obtaining negative permeability was known in 1999 after Professor Pendrie proposed the split ring resonator (SSR) structure.In 2001, a specific frequency range was used for metamaterials manufactured by combining wire and SSR structures. The metamaterial with the actual negative refractive index was produced.

In other words, to realize a negative dielectric constant, a wire structure composed of periodically arranged stripe patterns is used, and an SSR structure is used to obtain a negative permeability. By combining the wire structure and the SSR structure, the dielectric constant and permeability have negative values at the same time, thereby realizing the negative refractive index. Alternatively, a negative dielectric constant and a negative permeability may be obtained by using a structure such as an s-type resonator or an Ω-type unit cell. However, the meta-material prepared in this way has a problem that the frequency bandwidth of the negative refractive index is relatively narrow.

The present invention has been made to solve the above-mentioned problems, and compared with the conventional unit cell, and the meta-material that can extend the frequency bandwidth of the negative refractive index and the control of the dielectric constant, permeability or refractive index by using such a meta-material Provide a way to. The foregoing problem has been presented by way of example, and the scope of the present invention is not limited by this problem.

According to one aspect of the invention, the plate-like dielectric substrate; A first conductor pattern formed of a stripe extending on a top surface of the dielectric substrate with a first width; A second conductor pattern formed of a stripe extending on a lower surface of the dielectric substrate with a second width, wherein the first and second conductor patterns are provided by a broadband metamaterial having a cutting region in which some of the stripes are lost. do.

In this case, a passive element may be formed in the cutting region, and the passive element may include at least one of a capacitor and an inductor.

The first conductor pattern or the second conductor pattern may include a first stripe extending along an outer portion of the dielectric substrate; And a second stripe extending from the first stripe to the inside of the dielectric substrate and extending in parallel with the first stripe, wherein the cutting region is formed on the first stripe.

In addition, the first conductor pattern or the second conductor pattern may include a first stripe extending in a C shape; And a second stripe extending from the first stripe to the inside of the dielectric and extending in parallel with the first stripe, wherein the cutting region may be formed on the first stripe.

In this case, the first and second conductor patterns may have an array in which the first and second conductor patterns are rotated at a predetermined angle to each other.

In addition, the first and second conductor patterns may be asymmetric with each other.

According to another aspect of the present invention, a plate-like comprising a conductor pattern formed in one or more of the upper and lower surfaces of the plate-shaped dielectric substrate extending in a stripe shape and a passive element formed in the cutting region is missing a portion of the conductor pattern Preparing a metamaterial; And controlling any one or more parameters of the dielectric constant, permeability, and refractive index of the metamaterial by adjusting electrical characteristics of the passive element.

In this case, the passive element may be a capacitor or an inductor, and the electrical characteristics may be capacitance or inductance.

The metamaterial of the present invention can be controlled by varying the characteristics of a passive element such as a capacitor or an inductor to extend a frequency bandwidth indicating a negative refractive index. Therefore, miniaturization and wideband can be obtained, and at the same time, parameters such as permittivity, permeability, and refractive index can be adjusted according to frequency. The technical features of the present invention cannot be realized in a structure using only passive elements. Other metamaterials can be applied directly to many applications requiring changes in refractive index.

The effects of the present invention are not limited to those mentioned above, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a cross-sectional view, a plan view, and a rear view of a metamaterial according to an embodiment of the present invention.
2 is a plan view and a rear view of a metamaterial using a capacitor as a passive element.
FIG. 3 is a diagram illustrating electromagnetic characteristics according to the frequency of the metamaterial shown in FIG. 1.
4 is a diagram illustrating electromagnetic characteristics at a frequency of the metamaterial shown in FIG. 2.
5 is a plan view and a rear view of a metamaterial according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

1 is a cross-sectional view, a plan view, and a rear view of a metamaterial according to an embodiment of the present invention.

Referring to (a) of FIG. 1, the metamaterial 100 according to an embodiment of the present invention has a plate shape, and specifically, the first and second surfaces formed on the top and bottom surfaces of the dielectric substrate 101 and the dielectric substrate 101. Second conductor patterns 102 and 103.

The dielectric substrate 101 may have a plate-like structure in which a plurality of dielectrics having one or different dielectric constants are stacked.

Referring to Figure 1 (b), the left side shows the upper surface, the right side shows the lower surface. A first conductor pattern 102 made of a stripe extending with a first width is formed on the top surface, and a second conductor 103 made of a stripe extending with a second width is formed on the bottom surface. In this case, the first width and the second width may have the same value, but the present invention is not limited thereto and includes a different value.

At this time, the lower surface, which is the right side view, shows that the lower surface is deployed in the right direction while the upper surface of the dielectric substrate 101 is viewed from above, and the first conductor pattern of the upper surface in the vertical direction (z direction) of the dielectric substrate 101 is shown. 102 and the second conductor pattern 103 on the lower surface are symmetric with each other. This applies to all the drawings described below.

In this case, each of the first or second conductor patterns 102 and 103 may have a first stripe 102a and 103a and a first stripe 102a extending parallel to one side of the dielectric substrate 101 on an outer portion of the dielectric substrate 101. Second stripes 102b and 103b extending from 103a into the dielectric substrate 101 and extending parallel to the first stripes 102a and 103a.

The first and second conductor patterns 102 and 103 formed on the dielectric substrate 101 may form one unit cell.

In this case, at least one of the first conductor pattern 102 and the second conductor pattern 103 may be formed with a cutting region in which some of the stripes are lost. For example, as shown in FIG. 1B, portions of the stripe may be lost on the first and second conductor patterns 102 and 103 to form regions 104 and 105 where the stripe is completely cut.

In this case, the cutting regions 104 and 105 may be formed on the first stripes 102a and 102b as shown in FIG. 1B.

Passive elements may be formed in the cut regions 104 and 105. In this case, the passive element includes a capacitor or an inductor. Such a passive element may vary its tourmaline characteristics by an electrical signal, and control the frequency characteristics of the metamaterial 100 by controlling the value of the electrical characteristic. 2 shows an embodiment of a metamaterial with such passive elements.

2 is a plan view and a rear view of a metamaterial using a capacitor as a passive element.

Referring to FIG. 2, a capacitor 106 is formed as a passive element in the cut region of the first conductor pattern 102 formed on the top surface of the dielectric substrate 101, and on the right side, the dielectric substrate 101 is formed. The capacitor 107 is formed in the cut region of the second conductor pattern 103 formed on the lower surface.

When the passive element is a capacitor as shown in FIG. 2, a frequency band in which the metamaterial 100 has a negative dielectric constant, permeability, and refractive index (hereinafter referred to as a metamaterial parameter) may be changed according to a capacitance value of the capacitor. Can be.

FIG. 3 is a diagram illustrating electromagnetic characteristics according to the frequency of the metamaterial shown in FIG. 1.

Referring to FIG. 3, an index of refraction, an effective permittivity, a normalized impedence, and a relative permeability are shown.

4 is a diagram illustrating electromagnetic characteristics at a frequency of the metamaterial shown in FIG. 2.

4 shows the electromagnetic characteristics according to the frequency when the capacitance of the metamaterial is 0, 0.3, 1.0 pF. The black line, the red line, and the blue line show the results when the capacitance is 0, 0.3, 1.0 pF, respectively. .

Referring to (a) and (d) of FIG. 4, the effective dielectric constant represents a negative value in a frequency range of 0.834 GHz to 1.296 GHz introduced into the metamaterial 100 (see solid line in FIG. 4 b). ), It can be seen that the effective permeability has a negative value in the range of 0.860 GHz to 1.296 GHz (see solid line in FIG. 4D). Therefore, the refractive index from 0.834 GHz to 1.296 GHz may have a negative value. From this, according to the embodiment of the present invention, the refractive index may have a negative refractive index at a very wide frequency bandwidth of 43.38%.

At this time, the unit cell has a size downsized to about 0.21 times the frequency wavelength at 0.834 GHz, the lowest frequency at which the refractive index is negative.

Also, from (a) to (d) of FIG. 4, the effective parameter has a negative value in the range of 0.664 GHz to 0.916 GHz when using a 0.3 pF capacitor, and 0.522 GHz to 0.616 GHz when using a 1.0 pF capacitor. It can be seen that it has a negative value at.

From this, it can be seen that in the metamaterial including the capacitor, the frequency band in which the effective parameter indicates a negative value can be controlled by adjusting the capacitance, which is an electrical characteristic of the capacitor.

This effect can be equally applied to the case of using an inductor instead of a capacitor as a passive element.

Meanwhile, the first and second conductor patterns 102 and 103 may have an arrangement rotated at a predetermined angle with each other or may have an asymmetric structure with each other.

5 is a plan view and a rear view of a metamaterial according to another embodiment of the present invention.

FIG. 5A illustrates a case in which the second conductor pattern 103 is rotated 180 degrees with respect to the first conductor pattern 102, and FIG. 5B illustrates the first conductor pattern 102 and the second conductor pattern. This is the case where 103 is asymmetric with respect to the direction perpendicular to the dielectric substrate 101 (z direction in FIG. 1).

5C illustrates a dielectric substrate from the first stripe 102a and the first stripe 102a in which the first and second conductor patterns 102 and 103 extend in a C shape, as a variation of FIG. 1. It is comprised by the 2nd stripe 103b extended in parallel with the 1st stripe 102a after extending into 101 inside.

 Although only three expandable embodiments are shown in FIGS. 5A to 5C, a unique effective parameter value as shown in FIG. 3 can be obtained by appropriately adjusting the size and shape of the patterns located on both sides of the dielectric medium. .

As another aspect of the present invention, a method for controlling the parameters of a wideband metamaterial may be provided.

That is, a step of preparing a plate-shaped metamaterial including a conductor pattern formed in a stripe shape on at least one of the upper surface and the lower surface of the plate-shaped dielectric substrate and a passive element formed in a cutting region in which part of the conductor pattern is lost. Has

Next, controlling the electrical properties of the passive element to control any one or more parameters of the dielectric constant, permeability and refractive index of the metamaterial.

In this case, the passive element may include a capacitor or an inductor, and the electrical characteristics may be capacitance or inductance.

The foregoing description of specific embodiments of the invention has been presented for purposes of illustration and description. Therefore, the present invention is not limited to the above embodiments, and various modifications and changes can be made by those skilled in the art within the technical spirit of the present invention by combining the above embodiments with various modifications and changes. Do.

100: metamaterial 101: dielectric substrate
102: first conductor pattern 103: second conductor pattern
102a and 103a: first stripe pattern
102b and 103b: second stripe pattern
104, 105: cutting area 106, 107: capacitor

Claims (9)

Dielectric substrates;
A first conductor pattern formed of a stripe extending on a top surface of the dielectric substrate with a first width;
And a second conductor pattern formed of a stripe having a second width on a bottom surface of the dielectric substrate.
And the first and second conductor patterns have a cutting region in which some of the stripes are lost.
2. The broadband metamaterial of claim 1, wherein a passive element is formed in the cut region.
3. The broadband metamaterial of claim 2, wherein the passive element comprises at least one of a capacitor and an inductor.
The method of claim 1, wherein the first conductor pattern or the second conductor pattern is
A first stripe extending along an outer portion of the dielectric substrate;
A second stripe extending from the first stripe into the dielectric substrate and extending in parallel with the first stripe;
And the cutting region is formed on the first stripe.
The method of claim 1, wherein the first conductor pattern or the second conductor pattern is
A first stripe extending in a C shape;
A second stripe extending from the first stripe into the dielectric and then parallel to the first stripe;
And the cutting region is formed on the first stripe.
6. The broadband metamaterial of claim 4 or 5, wherein the first and second conductor patterns have a rotationally shifted arrangement at an angle to each other.
5. The broadband metamaterial of claim 4, wherein the first and second conductor patterns are asymmetric with each other in a direction perpendicular to the dielectric substrate.
Preparing a plate-shaped metamaterial including a conductor pattern formed in a stripe shape on at least one of an upper surface and a lower surface of a dielectric substrate, and a passive element formed in a cutting region in which part of the conductor pattern is lost; And
Controlling at least one parameter of dielectric constant, permeability, and refractive index of the metamaterial by adjusting electrical characteristics of the passive element;
Parameter control method of a wideband metamaterial comprising a.
The method of claim 8, wherein the passive element is a capacitor or an inductor, and the electrical property is capacitance or inductance.









KR1020100130253A 2010-12-17 2010-12-17 Broadband metamaterial and control method of broadband metamaterial with controllable effective constitutive KR20120068571A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103717046A (en) * 2012-09-29 2014-04-09 深圳光启创新技术有限公司 Wave absorbing material
CN103717047A (en) * 2012-09-29 2014-04-09 深圳光启创新技术有限公司 Wave-absorbing material
KR101498656B1 (en) * 2013-10-08 2015-03-05 서울시립대학교 산학협력단 Invisibility apparatus and method thereof
CN104538721A (en) * 2014-12-31 2015-04-22 清华大学 Metamaterial harmonic oscillator based on metal-structure LC resonator and application thereof
WO2016032301A1 (en) * 2014-08-29 2016-03-03 서울시립대학교산학협력단 Method for cloaking acoustic waves using scattering media having spatial periodicity, and apparatus thereof
WO2016032300A1 (en) * 2014-08-29 2016-03-03 서울시립대학교산학협력단 Method and apparatus for concealing sound waves considering generalized time dependency
KR20190080796A (en) * 2017-12-28 2019-07-08 서울대학교산학협력단 Hydrodynamic cloaking metamaterial and designing method thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103717046A (en) * 2012-09-29 2014-04-09 深圳光启创新技术有限公司 Wave absorbing material
CN103717047A (en) * 2012-09-29 2014-04-09 深圳光启创新技术有限公司 Wave-absorbing material
CN103717047B (en) * 2012-09-29 2017-12-22 深圳光启创新技术有限公司 A kind of absorbing material
CN103717046B (en) * 2012-09-29 2017-12-22 深圳光启创新技术有限公司 A kind of absorbing material
KR101498656B1 (en) * 2013-10-08 2015-03-05 서울시립대학교 산학협력단 Invisibility apparatus and method thereof
WO2015053521A1 (en) * 2013-10-08 2015-04-16 서울시립대학교 산학협력단 Cloaking device and method therefor
WO2016032301A1 (en) * 2014-08-29 2016-03-03 서울시립대학교산학협력단 Method for cloaking acoustic waves using scattering media having spatial periodicity, and apparatus thereof
WO2016032300A1 (en) * 2014-08-29 2016-03-03 서울시립대학교산학협력단 Method and apparatus for concealing sound waves considering generalized time dependency
US10460713B2 (en) 2014-08-29 2019-10-29 University Of Seoul Industry Cooperation Foundation Acoustic wave cloaking method and device considering generalized time dependency
US10468011B2 (en) 2014-08-29 2019-11-05 University Of Seoul Industry Cooperation Foundation Method and device for cloaking acoustic wave by using scattering media having spatial periodicity
CN104538721A (en) * 2014-12-31 2015-04-22 清华大学 Metamaterial harmonic oscillator based on metal-structure LC resonator and application thereof
KR20190080796A (en) * 2017-12-28 2019-07-08 서울대학교산학협력단 Hydrodynamic cloaking metamaterial and designing method thereof

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