KR102489559B1 - Miniaturizing method of antenna and wireless power transefer resonator uising granfene and carbon composite meterial - Google Patents

Abstract

It relates to a method for miniaturizing an antenna and a wireless power transmission resonator by applying graphene and carbon composite materials. A configuration in which a parasitic element structure is removed and a quasi-Mobius strip is cut at least once in a circumference is provided, Antennas and wireless power transmission resonators can be miniaturized by applying pins and carbon composite materials.

Description

Antenna and wireless power transmission resonator miniaturization method using graphene and carbon composite materials

The present invention relates to a method for miniaturizing an antenna and a wireless power transmission resonator by applying graphene and a carbon composite material, and more particularly, to a method for miniaturizing an antenna and a wireless power transmission resonator by applying graphene and a carbon composite material. .

As wireless mobile communication develops rapidly, various wireless communication systems such as 4G/5G mobile communication terminals, wireless control systems, things communication and the Internet of things, everything communication and wireless sensor networks are becoming more lightweight, simple, and easy to integrate. There is a demand for miniaturized devices.

Accordingly, various methods for reducing the physical size of circuits are being studied, and planar microwave devices and circuits are widely developed and applied because they are easy to design and manufacture.

In particular, manufacturers of mobile communication terminals and wireless control systems around the world require miniaturized, flexible, high-gain broadband antennas that operate with low power, have high radiation efficiency, and are free from space limitations when mounting circuits.

As a miniaturization technique of such an antenna, various methods such as a method of applying a helical structure, a method of applying a meta material and a stacked structure are applied.

Among them, the helical structure generates a resonant frequency whenever the circumference rotates once, so it is not suitable for a technique for miniaturizing an antenna with a single resonant frequency characteristic, and methods applying metamaterials and stacked structures have complicated structures. It has the disadvantage of increasing manufacturing cost.

In addition, a technology using a basic Möbius strip of a three-dimensional structure and a planar structure technology utilizing the characteristics of a Möbius strip have been proposed, but it is not a complete planar structure, and a coupling effect phenomenon at low frequencies has been proposed. There were problems that arose.

An example of a broadband monopole antenna technology according to the prior art is disclosed in Patent Document 1 and Patent Document 2 below.

Meanwhile, in 2004, as it succeeded in separating graphene from graphite using a transparent tape at room temperature, various technologies using graphene are being developed.

Graphite is a structure in which carbons are stacked in layers in which planes are arranged like a honeycomb-shaped hexagonal net, and one layer of this graphite is called graphene.

1 is an exemplary view of graphene.

Graphene has a very high physical and chemical stability with a thickness of 0.2 nm. In particular, graphene conducts electricity more than 100 times better than copper, and the mobility of electrons is more than 100 times faster than silicon, which is mainly used as a semiconductor. Its strength is more than 200 times stronger than steel, and its thermal conductivity is more than twice that of diamond, which boasts the highest thermal conductivity. In addition, since graphene passes most of the light, it is transparent and has excellent elasticity, so it does not lose its electrical properties even when stretched or bent.

The application fields of such graphene are very diverse. In other words, graphene includes ultra-high-speed semiconductors using high electrical properties, bendable displays using transparent electrodes, computers that operate only with displays, and high-efficiency solar cells using high conductivity. In particular, bendable displays, computers worn on the wrist or Since it can make electronic paper, it is attracting attention as a new material of the future.

Due to these characteristics, graphene is evaluated as a material that surpasses carbon nanotubes, which are in the limelight as a next-generation new material, and is called 'dream nanomaterial'.

Graphene and carbon nanotubes have very similar chemical properties, and metal and semiconducting properties can be separated through a post-process. However, since graphene has a more uniform metallic property than carbon nanotubes, it is more likely to be applied industrially.

Republic of Korea Patent Registration No. 10-0416883 (published on February 5, 2004) Republic of Korea Patent Registration No. 10-0660051 (Announced on December 22, 2006)

However, graphene has no band gap, so it has characteristics of a metal rather than a semiconductor.

There is a demand for the development of graphene semiconductor design technology by applying the characteristics of graphene.

An object of the present invention is to solve the above problems, and to provide a method of miniaturizing an antenna and a wireless power transmission resonator by applying graphene and a carbon composite material.

In order to achieve the above object, the method for miniaturizing an antenna and a wireless power transmission resonator using graphene and carbon composite materials according to the present invention removes the parasitic element structure and cuts the quasi-Mebius strip at least once in its circumference. It is characterized by applying a Mobius structure and miniaturizing an antenna and a wireless power transmission resonator by applying graphene and carbon composite materials.

At one end of the strip, the second bridge is connected by a third ring and a bridge, the fourth bridge is connected by a fifth ring and a bridge, and the first bridge is connected by a fifth and last bridge, At one end of another strip, the first bridge is connected by a second ring and bridge, and the third bridge is connected by a fourth ring and bridge.

The structure of the strip has a structure without knots and entanglements identical to the topology of the three-dimensional Mobius strip, and by applying the impedance matching parameter due to the variation of L and C according to the rotation angle of each ring, according to the frequency of graphene It is characterized in that the compensation of the conductivity loss is possible.

And in order to achieve the above object, a method for miniaturizing an antenna and a wireless power transmission resonator using graphene and carbon composite material according to the present invention is (a) applying a photolithography process to form a copper pattern and graphene on a substrate Forming a pattern and masking the photoresist, (b) depositing chromium metal to protect graphene in the plasma etching process, (c) maximizing the effect of graphene after forming a photoresist strip Etching graphene to make a copper-graphene structure, (d) transferring graphene on a copper electrode pattern, and protecting graphene by depositing a chromium electrode on the transferred graphene, (e) PTFE It is characterized in that it includes the step of removing the graphene on the substrate through plasma etching and removing the chromium electrode on the graphene to complete the copper-graphene electrode resonator array.

In addition, in order to achieve the above object, a method for miniaturizing an antenna and a wireless power transmission resonator using graphene and carbon composite materials according to the present invention deposits a copper electrode on a sapphire substrate or a quartz substrate and applies a resonator design. After patterning the copper electrode, by growing graphene on the substrate, it is characterized in that graphene is grown while copper is melted during the graphene growth process.

As described above, according to the method for miniaturizing an antenna and a wireless power transmission resonator using graphene and a carbon composite material according to the present invention, the effect of miniaturizing an antenna and a wireless power transmission resonator by applying graphene and a carbon composite material is obtained

And according to the present invention, the effect of miniaturization of the antenna and the resonator due to the increase in the rotation angle and NUMBER OF CUTS of each ring and the effect of controlling the QUALITY FACTOR are obtained.

In addition, according to the present invention, an effect that an antenna and a resonator can be manufactured in a better and smaller size by using the plasmon phenomenon of graphene is obtained.

1 is an exemplary diagram of graphene;
2 is a structure diagram of a Möbius strip (N = 0) and a Möbius strip cut once along the circumference (N = 1);
3 is a front view of a Quasi Mobius strip;
4 is a diagram illustrating an antenna to which graphene and carbon composite materials are applied according to a preferred embodiment of the present invention;
5 is a diagram showing a resonator array of the front and rear surfaces of a graphene pattern;
6 is a diagram showing a process of miniaturizing an antenna and a wireless power transmission resonator by applying graphene and a carbon composite material according to a preferred embodiment of the present invention.
7 is a diagram illustrating graphene growth on a sapphire substrate or a quartz substrate.

Hereinafter, a method for miniaturizing an antenna and a wireless power transmission resonator using graphene and a carbon composite material according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Although a monopole antenna has been described in this embodiment, it should be noted that the present invention is not necessarily limited thereto, and may be applied to RF passive elements such as unit resonant cells of meta materials, wireless power transmission resonators, oscillators, as well as monopole antennas. do.

2 is a structural diagram of a Möbius strip (N=0) and a Möbius strip cut once along the circumference (N=1).

The Möbius strip has a phase difference of 180° between inner space and outer space. In other words, there is a characteristic of an open space in which the inner space and the outer space are connected rather than separated.

Therefore, when the Möbius strip is cut along the circumference, it is not separated into two strips, but has a characteristic of becoming one strip whose length is doubled before being cut.

3 is a front view of a Quasi Mobius strip.

The antenna proposed in FIG. 3 applies a Quasi Mobius strip, which transforms a 3-dimensional Mobius strip into a 2-dimensional planar structure, to a radiator. If Quasi Mobius strip is applied in RF circuit design, the length of the entire circumference can be miniaturized while maintaining the resonant frequency. In FIG. 3 , two rings are crossed and connected.

Therefore, the monopole antenna according to the present invention is a radiator including a plurality of loops disposed in the center of the front surface of a dielectric substrate and formed in a structure in which a quasi-Mobius strip is cut along the circumference at least once or more, and one end of each loop is sequentially connected. The antenna is miniaturized by including a first bridge and a second bridge connecting via holes respectively formed at ends of the innermost loop and the outermost loop, and each loop of the radiator may be provided with ring lines having different diameters.

Referring to FIG. 4, the structure of an antenna using graphene and a carbon composite material according to a preferred embodiment of the present invention will be described.

4 is a diagram illustrating an antenna using graphene and a carbon composite material according to a preferred embodiment of the present invention.

As shown in FIG. 4, the antenna to which graphene and carbon composite materials are applied according to a preferred embodiment of the present invention has a VIA HOLE, that is, a QUASI MOBIUS structure without a parasitic element structure, and has Number of Cuts (N= 4) is.

At one end of the strip, the second bridge may be connected by the third ring and bridge, the fourth bridge may be connected by the fifth ring and bridge, and the first bridge may be connected by the last fifth bridge.

At one end of another strip, the first bridge may be connected by a second ring and bridge, and the third bridge may be connected by a fourth ring and bridge.

In this embodiment, it may have a structure to which the knot theory is applied.

That is, the three-dimensional Möbius strip has no knots or entanglements.

The strip structure applied to the antenna and resonator according to the embodiment of the present invention is a structure free from knots and entanglements in the same phase as the three-dimensional Möbius strip.

And, in this embodiment, it has a structure capable of compensating the conductivity loss according to the frequency of graphene.

That is, by applying the impedance matching parameter due to the variation of L and C according to the rotation angle of each ring, the conductivity loss according to the frequency of graphene can be compensated.

In addition, in this embodiment, miniaturization of the antenna and resonator and control of QUALITY FACTOR can be realized.

That is, the miniaturization effect of the antenna and resonator due to the increase in the rotation angle and NUMBER OF CUTS of each ring and the control of QUALITY FACTOR are possible.

5 is a diagram showing a resonator array on the front and rear surfaces of a graphene pattern, and FIG. 6 shows a process of miniaturizing an antenna and a wireless power transmission resonator by applying graphene and a carbon composite material according to a preferred embodiment of the present invention. it is a drawing

As shown in FIG. 5, in this embodiment, as a graphene-Cu (copper) hybrid structure, it may have a structure in which graphene is transferred onto a radial copper pattern on a PTFE substrate.

As shown in 1) to 3) of FIG. 6, the resonator having such a graphene pattern is similar to a general photolithography process, forming a copper pattern and a graphene pattern on a substrate, and forming a photoresist ( mask the photo resist.

And as shown in 4) of FIG. 6, chromium metal is deposited to protect the graphene in the plasma etching process.

After forming the photoresist strip in 5) of FIG. 6, the graphene is etched to create a copper-graphene structure to maximize the effect of graphene (6 of FIG. 6))

Here, the difference is that the graphene is transferred on the copper electrode pattern and the chromium electrode is deposited on the transferred graphene to protect the graphene.

Subsequently, the graphene on the PTFE substrate is removed through plasma etching (7 in FIG. 6), and finally, the copper-graphene electrode resonator array is completed by removing the chromium electrode on the graphene (8 in FIG. 6). ).

By forming a copper-graphene structure through such a process, high conductivity can be maintained.

In other words, copper is a metal that is very easily oxidized, so a material that protects the upper part is essential.

In the case of graphene-deposited copper, it can serve as a barrier to prevent oxidation and corrosion.

Therefore, the present invention can be said to be a structure suitable for a resonator having a structure that maintains conductivity as well as a barrier that prevents copper electrode oxidation.

Meanwhile, FIG. 7 is a diagram illustrating graphene growth on a sapphire substrate or a quartz substrate.

As shown in FIG. 7, the present invention deposits a copper electrode on a sapphire substrate or a quartz substrate to simplify the process, patterns the copper electrode to which the resonator design is applied, and then grows graphene on the substrate, As copper melts during the graphene growth process, the effect of graphene growth can be obtained.

As such, the present invention may constitute a sapphire/graphene electrode or a quartz/graphene electrode resonator.

In this case, better and smaller antennas and resonators can be manufactured using the surface plasmon phenomenon of graphene.

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention.

The present invention is applied to a method for miniaturizing an antenna and a wireless power transmission resonator using graphene and carbon composite materials.

Claims (5)

Remove the parasitic element structure and apply a quasi-Moebius structure in which the circumference of the quasi-Moebius strip is cut at least once, and apply graphene and carbon composite materials to make the antenna and wireless power transmission resonator smaller,
The structure of the strip has a structure without knots and entanglements identical to the topology of the three-dimensional Möbius strip,
It is possible to compensate for the conductivity loss according to the frequency of graphene by applying the impedance matching parameter due to the variation of L and C according to the rotation angle of each ring.
A method for miniaturizing antennas and resonators by increasing the rotation angle and NUMBER OF CUTS of each ring, and miniaturizing antennas and wireless power transmission resonators using graphene and carbon composite materials, characterized in that the control of QUALITY FACTOR is possible. According to claim 1,
At one end of the strip, the second bridge is connected by a third ring and a bridge, the fourth bridge is connected by a fifth ring and a bridge, and the first bridge is connected by a fifth and last bridge,
At one end of another strip, the first bridge is connected by the second ring and the bridge, and the third bridge is connected by the fourth ring and the bridge. An antenna using graphene and carbon composite materials, and A method for miniaturizing a wireless power transmission resonator. delete delete delete

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