KR101151379B1 - Artificial magnetic conductor with multi-band characteristic and antennas comprising it - Google Patents

Artificial magnetic conductor with multi-band characteristic and antennas comprising it Download PDF

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Publication number
KR101151379B1
KR101151379B1 KR1020100128507A KR20100128507A KR101151379B1 KR 101151379 B1 KR101151379 B1 KR 101151379B1 KR 1020100128507 A KR1020100128507 A KR 1020100128507A KR 20100128507 A KR20100128507 A KR 20100128507A KR 101151379 B1 KR101151379 B1 KR 101151379B1
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KR
South Korea
Prior art keywords
metal member
unit cell
layer
artificial magnetic
conductor
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KR1020100128507A
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Korean (ko)
Inventor
윤영중
윤지환
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연세대학교 산학협력단
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/10—Resonant antennas
    • H01Q5/15—Resonant antennas for operation of centre-fed antennas comprising one or more collinear, substantially straight or elongated active elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas

Abstract

PURPOSE: An artificial magnetic conductor and an antenna including the same are provided to control a frequency band in various modes by inserting a metal member inside a unit cell and forming a structure for generating a resonance. CONSTITUTION: A unit cell which has a predetermined pattern is arranged into a lattice structure on a conductive material layer(320). A first via(330) electrically connects a ground layer(310) and the conductive material layer. A metal member(350) arranges a resonance structure for generating a resonance. The size and pattern of the conductive material layer are controlled according to a frequency band.

Description

Artificial magnetic conductor with multi-band characteristic and antennas comprising it

The present invention relates to an artificial magnetic conductor, and in particular, by inserting a metal member of a predetermined shape inside each unit cell, and by modifying the structure of the unit cell in which the metal member is inserted, by modifying the resonant structure to cause a resonance phenomenon, The present invention relates to an artificial magnetic conductor having a multi-band characteristic that can adjust the frequency band more variously and an antenna including the same.

Artificial Magnetic Conductor (AMC) is one of meta-materials representing phenomena that do not generally exist in the natural world, and is attracting attention as a core technology capable of overcoming physical limitations of existing technologies. Artificial magnetic conductors, unlike electrical conductors found in nature, refer to structures with surfaces that have the characteristics of magnetic conductors in a specific frequency region artificially.

The artificial magnetic conductor is composed of an electrical conductor, and has a protrusion-like structure on the surface of the conductor to generate a capacitance component and an inductance component. These components are a function of frequency and have a characteristic that the surface impedance becomes very high by these components in a specific frequency region. In the case of a general conductor, the surface impedance is 0 and the reflection coefficient is '-1', so that the image current is reversed. In the case of artificial magnetic conductors, the surface impedance is very large and the reflection coefficient is '+1'. It has a characteristic that the image current is in phase. In addition, due to the high surface impedance, it has the property of suppressing the propagation of surface waves.

1 is a view showing a front view and a side view of the artificial magnetic conductor according to the prior art.

As shown in FIG. 1, the artificial magnetic conductor according to the related art is formed in a uniform lattice structure by periodically arranging unit structures or unit cells, and each unit cell includes a ground layer 110 and a conductor layer. And a via or via hole 130 or the like.

The dielectric layer 140 is formed in the space between the ground layer 110 and the conductor layer 120.

Figure (a) shows the front view, Figure (b) shows the side view, and Figure (c) shows the structure of the unit cell.

Figure 2 is a graph showing the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor according to the prior art.

As shown in FIG. 2, the phase change of the reflection coefficient according to the variation of the surface impedance generated by the capacitance component and the inductance component between the unit cells of the artificial magnetic conductor according to the prior art is shown by the computer simulation. .

The phases of the reflection coefficients of all the unit cells at each frequency are the same. At a frequency where the reflection coefficient phase is zero, it has perfect magnetic conductor properties.

However, the artificial magnetic conductor according to the related art can suppress unwanted rear dead by suppressing parasitic current, but it is difficult to adjust the frequency band.

Accordingly, an object of the present invention is to solve the problems of the prior art, and an object of the present invention is to insert a metal member of a predetermined shape into each unit cell, and to modify the structure of the unit cell into which the metal member is inserted, to cause resonance. By modifying the structure, to provide an artificial magnetic conductor having a multi-band characteristics that can be adjusted in a variety of frequency bands and an antenna comprising the same.

In order to achieve the above objects, an artificial magnetic conductor according to an aspect of the present invention comprises a ground layer; A conductor layer electrically connected to the ground layer and having unit cells having a predetermined pattern arranged in a lattice structure; A first via electrically connecting the ground layer and the conductor layer; And a metal member formed in a space formed by the ground layer, the conductor layer, and the via and connected to an adjacent unit cell to form a resonance structure for causing a resonance phenomenon.

If necessary, the pattern and size of the conductor layer is characterized in that it is adjusted according to the frequency band to be implemented.

If necessary, the predetermined pattern may be any one of a structure including a triangular structure, a square structure, a hexagonal structure, a meander structure, an interdigital structure, a spiral, and a slit.

If necessary, the length and thickness of the metal member is characterized in that it is adjusted according to the frequency band to be implemented.

Preferably, the metal member is formed in a multi-layer structure, the upper metal member and the lower metal member is formed by a predetermined interval spaced apart, one side of the upper metal member and one side of the lower metal member is a second via Is connected through, the other side of the upper metal member is connected to the upper metal member in the adjacent unit cell, the other side of the lower metal member is spaced apart from the lower metal member in the adjacent unit cell by a predetermined interval the resonance structure Characterized in that form.

If necessary, the distance between the first via and the plurality of second vias is adjusted according to a frequency band to be implemented.

If necessary, at least two of the pattern and size of the conductor layer, the length and thickness of the metal member, and the position of the first via are adjusted according to a frequency band to be implemented.

According to another aspect of the present invention, an antenna including an artificial magnetic conductor includes: a ground layer; A conductor layer electrically connected to the ground layer and having unit cells having a predetermined pattern arranged in a lattice structure; A first via electrically connecting the ground layer and the conductor layer; And a metal member formed in a space formed by the ground layer, the conductor layer, and the via and connected to an adjacent unit cell to form a resonance structure for causing a resonance phenomenon.

If necessary, the pattern and size of the conductor layer is characterized in that it is adjusted according to the frequency band to be implemented.

If necessary, the predetermined pattern may be any one of a structure including a triangular structure, a square structure, a hexagonal structure, a meander structure, an interdigital structure, a spiral, and a slit.

If necessary, the length and thickness of the metal member is characterized in that it is adjusted according to the frequency band to be implemented.

Preferably, the metal member is formed in a multi-layer structure, the upper metal member and the lower metal member is formed by a predetermined interval spaced apart, one side of the upper metal member and one side of the lower metal member is a second The other side of the upper metal member is connected to the upper metal member in the adjacent unit cell, and the other side of the lower metal member is spaced apart from the lower metal member in the adjacent unit cell by a predetermined interval so that the resonance occurs. It is characterized by forming a structure.

If necessary, the distance between the first via and the plurality of second vias is adjusted according to a frequency band to be implemented.

If necessary, at least two of the pattern and size of the conductor layer, the length and thickness of the metal member, and the position of the first via are adjusted according to a frequency band to be implemented.

As described above, the present invention can vary the frequency band by inserting a metal member of a predetermined shape into each unit cell and modifying the structure of the unit cell into which the metal member is inserted to cause a resonance phenomenon. It has an effect.

In addition, the present invention, by inserting a metal member of a predetermined shape inside each unit cell and by modifying the structure of the unit cell in which the metal member is inserted, by modifying the resonant structure for causing a resonance phenomenon, miniaturization than the existing artificial magnetic conductor There is an effect that may be possible.

In addition, the present invention can obtain a multi-band characteristic by inserting a metal member of a predetermined type inside each unit cell and modifying the structure of the unit cell in which the metal member is inserted to cause a resonance phenomenon. It works.

1 is a view showing a front view and a side view of the artificial magnetic conductor according to the prior art.
Figure 2 is a graph showing the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor according to the prior art.
3 is an exemplary view showing a unit cell structure of an artificial magnetic conductor according to an embodiment of the present invention.
4 is an exemplary view for explaining the shape of the metal member 340 according to the embodiment of the present invention.
5 is a graph showing the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor according to the present invention.
FIG. 6 is a first exemplary diagram illustrating a form of a unit cell structure according to an embodiment of the present invention. FIG.
7 is a second exemplary view showing the form of a unit cell structure according to an embodiment of the present invention.
8 is a third exemplary view showing the form of a unit cell structure according to an embodiment of the present invention.
9 is a fourth exemplary view showing the form of a unit cell structure according to an embodiment of the present invention.

Hereinafter, an artificial magnetic conductor having a multi-band characteristic according to an embodiment of the present invention and an antenna including the same will be described with reference to FIGS. 1 to 9. It will be described in detail focusing on the parts necessary to understand the operation and action according to the present invention.

In the present invention, a metal member of a predetermined shape is inserted into each unit cell in the artificial magnetic conductor, and the structure of the unit cell in which the metal member is inserted is modified. By modifying the resonant structure for causing a resonance phenomenon by modifying the position of, etc., we propose a method that can adjust the frequency band more variously, for example, frequency up or frequency down, and widening or narrowing.

Here, the artificial magnetic conductor has resonance characteristics due to capacitance and inductance between unit cells of the lattice structure.

The artificial magnetic conductor may be applied to an antenna as well as a general substrate because there is a portion where the reflection phase does not change for a specific frequency. For example, the present invention can be applied to all antennas used in a mobile terminal and a base station for a wireless communication service.

3 is an exemplary view showing a unit cell structure of an artificial magnetic conductor according to an embodiment of the present invention.

As shown in FIG. 3, the artificial magnetic conductor according to the present invention is formed in a uniform lattice structure by periodically arranging mushroom-shaped unit structures or unit cells, wherein each unit cell is a ground layer 310. , A conductor layer 320, a via or via hole 330, a metal member 350, and the like.

The dielectric layer 340 is formed in the space between the ground layer 310 and the conductor layer 320.

Thus, the unit cell constituting the artificial magnetic conductor has an inductive component as well as a capacitive component. The unit cell is preferably a conductive material such as metal, for example copper or metal alloy.

The ground layer 310 is formed of a conductor, and the conductor layer 320 is formed in a pattern such as a triangular structure, a square structure, a hexagonal structure, and the like, and is electrically connected to the ground layer 310. In addition, the conductor layer 320 may be a meander structure, an interdigital structure, a helical structure, or a slit-containing structure for miniaturization of the artificial magnetic conductor.

The via 330 is an electrical passage that electrically connects the ground layer 310 and the conductor layer 320 and is formed of a conductive material or material.

The metal member 350 is formed in various forms inside the unit cell. The metal member 350 is formed in a space formed by the ground layer 310, the via 330, and the conductor layer 320 in a multi-layered structure, and may be formed in various shapes or structures for causing a resonance phenomenon.

In particular, the metal member 350 may be formed in multiple layers. For example, the metal members 350 are formed in two layers spaced apart by a predetermined distance, and the metal members 350 formed in the two layers are electrically connected through vias. This will be described with reference to FIG. 4.

4 is an exemplary view for explaining the shape of the metal member 350 according to the embodiment of the present invention.

As shown in FIG. 4, the structure formed by the metal member 350 in the unit cell according to the present invention, that is, the resonance structure for causing the resonance phenomenon is formed by the unit cells adjacent to each other. That is, the metal members 350a and 350a 'of the second layer of each unit cell adjacent to each other are connected, and the metal members 350b and 350b' of the third layer are not connected but spaced apart by a predetermined distance.

Therefore, a resonance structure for causing a resonance phenomenon is formed by the metal members adjacent to each other.

5 is a graph showing the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor according to the present invention.

As shown in FIG. 5, it can be seen that the results of computer simulation of the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor according to the present invention show multiband characteristics.

For example, multiband characteristics are shown in two frequency bands. In other words, the frequency band where the reflected phase becomes zero appears at 1.1921 to 1.317 GHz in the front and 2.4283 to 2.45 GHz in the back.

At a frequency where the reflection coefficient phase is zero, it has perfect magnetic conductor properties.

At this time, the present invention is to modify the structure of the unit cell in which the metal member is inserted to adjust the frequency band in various ways, for example, 1) when changing the size of the conductive layer, 2) changing the length or thickness of the metal member 3) A case of changing the position of the via will be described.

FIG. 6 is a first exemplary diagram illustrating a form of a unit cell structure according to an embodiment of the present invention. FIG.

As shown in FIG. 6, when the unit cell according to the present invention changes the size or length of the conductor layer as shown in FIG. (A), the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor as shown in (b) Is showing. For example, it can be seen that as the size of the conductor layer, for example, the width or length increases, the frequency band where the reflection phase becomes zero is adjusted.

In addition, the shape of the conductor layer may be changed as well as the size thereof. For example, the conductor layer may be formed in any one of a triangular structure, a square structure, a hexagonal structure, a meander structure, an interdigital structure, or a spiral structure and a structure including a slit.

7 is a second exemplary view showing the form of a unit cell structure according to an embodiment of the present invention.

As shown in FIG. 7, when the unit cell according to the present invention changes the length or thickness of a metal member as shown in FIG. (A), the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor as shown in (b) Is showing. For example, it can be seen that as the size of the conductor layer increases, the frequency band where the reflection phase becomes zero is adjusted.

At this time, referring to Figure 4, since the metal member of the upper metal member formed of a multi-layer structure and the lower metal member forms a resonance structure for causing a resonance phenomenon, the length of the upper metal member is not changed, the lower metal member Only the length of is changed.

However, both the thickness of the upper metal member and the thickness of the lower metal member can be changed.

8 is a third exemplary view showing the form of a unit cell structure according to an embodiment of the present invention.

As shown in FIG. 8, when the unit cell according to the present invention changes the length or thickness of the metal member as shown in FIG. (A), the phase change of the reflection coefficient according to the surface impedance change of the artificial magnetic conductor as shown in (b) As a result of computer simulation, it can be seen that it shows multi-band characteristics.

Comparing the phase change of the reflection coefficient according to the surface impedance change of the unit cell with FIG. 5, it can be seen that the multiband characteristic is shown at a lower frequency. This means that the same unit cell can be operated at a lower frequency, which means that it can be implemented at a smaller size at the same frequency, thereby miniaturizing the artificial magnetic conductor.

9 is a fourth exemplary view showing the form of a unit cell structure according to an embodiment of the present invention.

As shown in Figure 9, the unit cell according to the present invention, when changing the position of the via, that is, the distance from the via connecting the metal member, as shown in Figure (a), the surface impedance of the artificial magnetic conductor as shown in Figure (b) The phase change of the reflection coefficient with the change is shown. For example, it can be seen that as the size of the conductor layer increases, the frequency band where the reflection phase becomes zero is adjusted.

In this case, the vias connecting the ground layer and the conductor layer may have the same distance or different distances from the plurality of vias connecting the metal members.

At this time, in the embodiment of the present invention, 1) when changing the size of the conductive layer, 2) when changing the length or thickness of the metal member, 3) the case of changing the position of the via, respectively, but is limited to this The shape of the unit cell may be changed by combining at least two of the size of the conductor layer, the length or thickness of the metal member, and the position of the via.

Of course, the present invention is not limited to changing the shape of the conductor, the metal member, and the via, and all the elements forming the resonance structure for causing the resonance phenomenon can be applied.

As such, the present invention forms a resonant structure of a predetermined shape by inserting at least one metal member into each unit cell, and modifies the shape of the resonant structure, thereby controlling the frequency band in various ways, and comparing the existing artificial magnetic conductors. Miniaturization may be possible.

In addition, the present invention forms a resonant structure of a predetermined shape by inserting at least one metal member inside each unit cell, and by modifying the shape of the resonant structure, to implement an antenna having a multi-band characteristics when applied to the antenna Can be.

Various modifications and variations will be possible to those skilled in the art without departing from the essential features of the present invention to which an artificial magnetic conductor having a multi-band characteristic according to the present invention and an antenna including the same. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

310: ground layer
320: conductor layer
330: Via
340: dielectric layer
350: metal member

Claims (14)

Ground layer;
A conductor layer electrically connected to the ground layer and having unit cells having a predetermined pattern arranged in a lattice structure;
A first via electrically connecting the ground layer and the conductor layer; And
A metal member formed in a space formed by the ground layer, the conductor layer, and the via, and connected to an adjacent unit cell to form a resonance structure for causing a resonance phenomenon.
Artificial magnetic conductor comprising a. The method according to claim 1,
Pattern and size of the conductor layer, artificial magnetic conductor, characterized in that adjusted according to the frequency band to be implemented. The method according to claim 1,
The constant pattern is,
Artificial magnetic conductor, characterized in that any one of a structure including a triangular structure, square structure, hexagonal structure, meander structure, interdigital structure, spiral, slit. The method according to claim 1,
The length and thickness of the metal member, artificial magnetic conductor, characterized in that adjusted according to the frequency band to be implemented. The method according to claim 1,
The metal member is formed in a multi-layer structure, the upper metal member and the lower metal member is formed spaced apart by a predetermined interval,
One side of the upper metal member and one side of the lower metal member are connected through a second via,
The other side of the upper metal member is connected to the upper metal member in the adjacent unit cell, and the other side of the lower metal member is spaced apart from the lower metal member in the adjacent unit cell by a predetermined interval to form the resonance structure. Artificial magnetic conductor made with. The method of claim 5,
And the distance between the first via and the second via is adjusted according to a frequency band to be implemented. The method according to claim 1,
At least two of the pattern and size of the conductor layer, the length and thickness of the metal member, and the position of the first via are adjusted according to a frequency band to be implemented. In the antenna comprising an artificial magnetic conductor,
Ground layer;
A conductor layer electrically connected to the ground layer and having unit cells having a predetermined pattern arranged in a lattice structure;
A first via electrically connecting the ground layer and the conductor layer; And
A metal member formed in a space formed by the ground layer, the conductor layer, and the via, and connected to an adjacent unit cell to form a resonance structure for causing a resonance phenomenon.
Antenna comprising a. The method of claim 8,
Pattern and size of the conductor layer, characterized in that the antenna is adjusted according to the frequency band to be implemented. The method of claim 8,
The constant pattern is,
An antenna comprising any one of a triangular structure, a square structure, a hexagonal structure, a meander structure, an interdigital structure, a spiral, and a slit. The method of claim 8,
The length and thickness of the metal member, characterized in that the antenna is adjusted according to the frequency band to be implemented. The method of claim 8,
The metal member is formed in a multi-layer structure, the upper metal member and the lower metal member is formed spaced apart by a predetermined interval,
One side of the upper metal member and one side of the lower metal member are connected through a second via,
The other side of the upper metal member is connected to the upper metal member in the adjacent unit cell, and the other side of the lower metal member is spaced apart from the lower metal member in the adjacent unit cell by a predetermined interval to form the resonance structure. Antenna. The method of claim 12,
The distance between the first via and the second via is adjusted according to the frequency band to be implemented. The method of claim 8,
At least two of the pattern and size of the conductor layer, the length and thickness of the metal member, and the position of the first via are adjusted according to the frequency band to be implemented.
KR1020100128507A 2010-12-15 2010-12-15 Artificial magnetic conductor with multi-band characteristic and antennas comprising it KR101151379B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015041422A1 (en) * 2013-09-23 2015-03-26 삼성전자주식회사 Antenna apparatus and electronic device having same
CN106299632A (en) * 2015-05-13 2017-01-04 中兴通讯股份有限公司 Artificial magnetic conductor construction unit, artificial magnetic conductor structure and corresponding polarization plane antenna
KR102106357B1 (en) 2018-12-31 2020-05-04 한국과학기술원 Apparatus for generating OAM mode by using anisotropic transmission plate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015041422A1 (en) * 2013-09-23 2015-03-26 삼성전자주식회사 Antenna apparatus and electronic device having same
US9972919B2 (en) 2013-09-23 2018-05-15 Samsung Electronics Co., Ltd. Antenna apparatus and electronic device having same
CN106299632A (en) * 2015-05-13 2017-01-04 中兴通讯股份有限公司 Artificial magnetic conductor construction unit, artificial magnetic conductor structure and corresponding polarization plane antenna
KR102106357B1 (en) 2018-12-31 2020-05-04 한국과학기술원 Apparatus for generating OAM mode by using anisotropic transmission plate

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