KR101255969B1 - Wireless Energy Transmission Structure - Google Patents

Abstract

The present invention relates to a wireless energy transmission structure, comprising a printed circuit board, a disk portion and a wire portion. The printed circuit board is formed in a ring shape, and the disc part is disposed between the first conductor plate and the second conductor plate and the first conductor plate and the second conductor plate formed on the printed circuit board so as to be spaced apart from each other at predetermined intervals. Comprising an inserted dielectric material, the wire portion is connected to a plurality of meta cells formed of a meta-material structure formed repeatedly to surround the inner and outer periphery of the printed circuit board and the first conductor plate and the second conductor plate, respectively It consists of a transmission line formed to surround a plurality of meta cells.

Description

Wireless Energy Transmission Structure

The present invention relates to a wireless energy transmission structure.

Due to the rapid development of wireless communication technology, new applications that have been possible only in virtual reality are being challenged and many parts are rapidly implemented and realized.

Most notable among them is U-City using USN (Ubiquitous Sensor Network), femto cell field to enable home network, robot serving as housekeeping assistant, and emergency mission during wartime operation. Drones, cosmic solar power to solve future energy and environmental problems.

These application fields collect information in each field and use it to enable recognition, prevention and control of all matters.

However, the systems that are applied to these applications are capable of wireless communication, but they still show problems in terms of energy supply and transmission. Therefore, they can not be called a wireless communication system or a wireless system in a real sense, There is an extremely dominant problem in the amount of energy that can be transferred.

On the other hand, electric toothbrushes, notebooks, walkmans, etc. are used inductance coupling technology due to electromagnetic waves, called electromagnetic induction, but such inductance coupling technology due to electromagnetic waves causes energy transmission efficiency to deteriorate rapidly if the coupling coefficient of the inductor is not high. There is a disadvantage that wireless energy transfer is impossible when leaving a specific location.

Accordingly, it is similar to the electromagnetic induction method in order to solve problems such as low power, transmission distance, amount of energy that can be transmitted, and time available for continuous operation, but energy is concentrated at a specific resonance frequency by an inductor and a capacitor, A magnetic resonance technique for transmitting is being developed.

The wireless energy transmission structure using the magnetic resonance technology has a merit that it can transmit a relatively large power to several meters as compared with the electromagnetic induction method, but it requires a high quality factor.

In general, a wireless energy transfer structure using magnetic resonance technology is configured to include a disk portion consisting of two conductor plates and a dielectric inserted between the two conductor plates and a ring-shaped wire portion connected to both ends of the disk portion.

In the wireless energy transmission structure, when energy is supplied to both ends of the wire of the wireless energy transmission device, an electric field is formed by the capacitance of the disk according to the supplied energy, and a magnetic field is formed by the inductance of the wire.

At this time, the magnetic field formed by the wire and the electric field formed in the disk periodically exchanges energy, and a magnetic field is formed between the wireless energy transmitter and the wireless energy receiver due to the periodic exchange of energy.

As such, the magnetic field formed between the wireless energy transmitter and the wireless energy receiver forms a magnetic field and an electric field on the wires and the disks of the wireless energy receiver, respectively.

In other words, an electric field and a magnetic field are formed in the wireless energy receiver as in the wireless energy transmitter.

As a result, the wireless energy receiver supplies energy transmitted from the wireless energy transmitter to the electrical device through a wire.

In order to achieve high resonance characteristics, the wireless energy transmission structure using the magnetic resonance technique having such a structure needs to increase the intensity of the electric field and the magnetic field generated in the disk part and the wire part.

However, in order to increase the strength of the electric field and the magnetic field in the conventional wireless energy transmission structure, the size of the disk portion and the wire portion must be large.

The present invention is designed to solve the above problems, by forming a wire in a meta-material structure, by using a variable capacitor to reduce the size and easy to manufacture, wireless energy transmission that can improve the transmission distance and transmission efficiency It is intended to provide a structure.

In order to achieve the above object, a wireless energy transmission structure according to an embodiment of the present invention is a ring-shaped printed circuit board; A disk unit comprising a first conductor plate and a second conductor plate formed on the printed circuit board and a dielectric material interposed between the first conductor plate and the second conductor plate so as to be spaced apart from each other by a predetermined interval; And a plurality of meta cells formed of a meta material structure repeatedly formed to surround the inner and outer sides of the printed circuit board, and a transmission line connected to the first conductor plate and the second conductor plate, respectively, and surrounding the plurality of meta cells. It includes a wire portion made of.

In addition, in the wireless energy transmission structure according to an embodiment of the present invention, the printed circuit board is characterized in that it is formed in a ring shape of a circular or square.

In addition, in the wireless energy transmission structure according to the embodiment of the present invention, the printed circuit board has a width of a ring portion of 3 cm and a length of one side of 30 cm.

In addition, in the wireless energy transmission structure according to the embodiment of the present invention, the printed circuit board is characterized in that the dielectric constant is 4.4 and the thickness is formed of FR4 having a thickness of 2.0mm.

In addition, in the wireless energy transmission structure according to the embodiment of the present invention, the disk unit is characterized in that the capacitor value is variable according to the resonance frequency.

In the wireless energy transmission structure according to the embodiment of the present invention, the disk unit may vary the capacitor value by a capacitor for resonant frequency compensation provided between the first conductor plate and the second conductor plate.

In addition, in the wireless energy transmission structure according to an embodiment of the present invention, the dielectric material is air.

In addition, the dielectric material in the wireless energy transmission structure according to the embodiment of the present invention is characterized by having a dielectric constant of 9.2.

In addition, in the wireless energy transmission structure according to the embodiment of the present invention, the width between the first conductor plate and the second conductor plate is 0.28 mm, and the radius of the first conductor plate and the second conductor plate is 50 mm. The width of the first conductor plate and the second conductor plate is 30 mm.

In addition, in the wireless energy transmission structure according to an embodiment of the present invention, the meta cell may include: a first meta cell repeatedly formed to surround the inside of the printed circuit board; And a second meta cell repeatedly formed to surround the periphery of the printed circuit board.

In addition, in the wireless energy transmission structure according to an embodiment of the present invention, the first meta cell and the second meta cell are connected to each other in parallel to form a pair.

In addition, in the wireless energy transmission structure according to the embodiment of the present invention, the spacing between the first metacell and the second metacell is 2.0 mm, and the spacing between the line width and the lines of the first metacell and the second metacell is It is characterized by being 1.0 mm.

In addition, the meta-cell in the wireless energy transmission structure according to an embodiment of the present invention is characterized in that formed in a circle or a square.

In addition, in the wireless energy transmission structure according to an embodiment of the present invention, the meta cell has a spiral structure.

In addition, in the wireless energy transmission structure according to an embodiment of the present invention, the meta cell has a split ring structure.

In addition, the meta-cell is formed of two or more split rings, the divided portion of the split ring is characterized in that formed in a position facing each other.

In addition, the transmission line in the wireless energy transmission structure according to an embodiment of the present invention is characterized in that the meta-cell is formed in an etched form.

According to the present invention, the transmission distance and transmission efficiency of the wireless energy can be improved, the wireless energy transmission structure can be downsized, and the production of the wireless energy transmission structure can be easily performed.

1 is a view showing a wireless energy transmission structure according to an embodiment of the present invention.
FIG. 2 is a detailed diagram illustrating a shape in which a capacitor for resonant frequency compensation is installed in the disk unit illustrated in FIG. 1.
3 is a cross-sectional perspective view of the disk portion shown in FIG. 1.
4 is a diagram illustrating an input / output matching circuit of the wireless energy transmission structure illustrated in FIG. 1.
5 is a diagram illustrating a wireless energy transmission structure according to another embodiment of the present invention.
FIG. 6 is a diagram illustrating an input / output matching circuit of the wireless energy transmission structure illustrated in FIG. 5.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments associated with the accompanying drawings.

Prior to this, the terms or words used in this specification and claims should not be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain the invention in the best way. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

It should be noted that, in the present specification, the same reference numerals are used to denote the same elements in the drawings, even if they are shown in different drawings.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a wireless energy transmission structure according to an embodiment of the present invention, FIG. 2 is a detailed view showing a shape in which a resonant frequency compensation capacitor is installed in a disk unit shown in FIG. 1, and FIG. 3 is FIG. 1. It is a cross-sectional perspective view of the disk part shown in FIG.

Wireless energy transmission structure 1 according to an embodiment of the present invention is a ring-shaped printed circuit board 2, as shown in Figures 1 to 3, the printed circuit board 2 so as to be spaced apart a predetermined interval corresponding to each other A disk portion 10 made of a first conductor plate 12 and a second conductor plate 14 and a dielectric material 16 interposed between the first conductor plate 12 and the second conductor plate, and A plurality of meta cells 22 formed of a meta material structure (ie, a structure formed to have a negative refractive index) repeatedly formed to surround the inner and outer sides of the printed circuit board 2; It is configured to include a wire portion 20 made of a transmission line 24 connected to the first conductor plate 12 and the second conductor plate 14 and surround the plurality of meta cells 22, respectively.

The printed circuit board 2 is formed to have a structure of any one of a cross section and a multilayer structure, and is formed in a ring shape.

When the printed circuit board 2 has a multilayer structure, the first conductor plate 12, the second conductor plate 14, and the transmission line 24 are connected to each other through a via hole (not shown).

On the other hand, the ring-shaped printed circuit board 2 may be formed in a circle or a square, preferably in a square to provide a wider area and longer wire than the circle at the same radius length.

In the ring-shaped printed circuit board 2, the width of the ring (ie, the width of the portion where the wire part 20 is formed) (W) is 2.5 cm to 3.5 cm, preferably 3.0 cm, and the length of one side. (L) is 27 cm-33 cm, Preferably it is 30 cm.

Further, the printed circuit board 2 is formed of FR4 having a dielectric constant of 4.0 to 4.8, preferably 4.4, and a thickness t of 1.8 mm to 2.2 mm, preferably 2.0 mm.

The disk unit 10 serves as a capacitor in the magnetic field-based LC resonance, and includes the first conductor plate 12, the second conductor plate 14, and the first conductor plate 12 and the first conductor plate 12. It consists of a dielectric material 16 inserted between two conductor plates 14.

The disk unit 10 generates an electric field between the first conductor plate 12 and the second conductor plate 14 when power supplied from a power supply unit (not shown) is supplied through the transmission line 24. do.

On the other hand, the disk unit 10, as shown in Figure 2 to compensate for the resonance frequency is shifted due to an error generated during the manufacture of the wireless energy transmission structure, as shown in Figure 2 and the second conductor plate ( The resonance frequency compensation capacitor 18 may be provided between the 14).

That is, the disc part 10 may include the dielectric material 16 inserted between the first conductor plate 12, the second conductor plate 14, and the first conductor plate 12 and the second conductor plate 14. By using a capacitor consisting of a capacitor and the resonant frequency compensation capacitor 18, the capacitor value can be varied as necessary.

Meanwhile, as the dielectric material 16 inserted between the first conductor plate 12 and the second conductor plate 14, air or a separate dielectric having a predetermined dielectric constant? Is used.

As shown in FIG. 3, the disk portion 10 has a width d between the first conductor plate 12 and the second conductor plate 14 of 0.2 mm to 0.4 mm, preferably 0.28 mm. The radius r of the first conductor plate 12 and the second conductor plate 14 is 30 mm to 80 mm, preferably 50 mm, and the first conductor plate 12 and the second conductor plate 14. The width w of is 20 mm to 40 mm, preferably 30 mm.

In addition, the dielectric constant of the dielectric material 16 is 8.6 to 10, preferably 9.2.

The wire part 20 serves as an inductor in magnetic field-based LC resonance, and includes a plurality of first metacells formed of a metamaterial structure repeatedly formed to surround the inside of the printed circuit board 2. 22a), a plurality of second metacells 22b formed of a metamaterial structure repeatedly formed to surround the outer surface of the printed circuit board 2, and the first conductor plate 12 and the second conductor plate 14 And a transmission line 24 connected to each of the plurality of first meta cells 22a and the second meta cells 22b.

In this case, the first meta cell 22a and the second meta cell 22b are connected to each other in parallel to form a pair, and a pair form is formed inside and outside of the printed circuit board 2 in series. It will be repeated to enclose.

The first meta cell 22a and the second meta cell 22b are formed in a circle or a quadrangle, but preferably in a quadrangle.

The reason why the meta cell 22 is formed in a quadrangle is that a wider area can be obtained than a circular shape at a length of the same radius, and the portions of the metamaterial structures which are in contact with each other are larger and wider than the circular shape.

The first meta cell 22a and the second meta cell 22b are formed in a spiral resonance structure as shown in FIGS. 1 and 2.

In this case, the first meta cell 22a and the second meta cell 22b are spaced apart to have an interval of 1.5 mm to 2.5 mm, preferably 2.0 mm, and the first meta cell 22a and the second meta cell are spaced apart from each other. The interval between the line width and the line of 22b is 0.7 mm to 1.3 mm, preferably 1.0 mm.

The transmission line 24 receives energy or supplies energy, and is connected to the first conductor plate 12 and the second conductor plate 14, respectively, and has a helical resonance metamaterial structure, that is, the first meta cell 22a. ) And the second meta cell 22b are formed in an etched structure.

That is, the first meta cell 22a and the second meta cell 22b are formed in an intaglio structure in which the transmission line 24 is etched.

As a result, the transmission line 24 surrounds the first meta cell 22a and the second meta cell 22b.

This transmission line 24 is formed of copper having a thickness of 0.05 mm to 0.09 mm, preferably 0.07 mm.

In the wireless energy transmission structure according to an embodiment of the present invention, the disk unit 10 and the wire unit 20 are formed on only one surface of the printed circuit board 2 or the printed circuit board 2 as shown in FIG. 1. It can be formed on both sides of the).

On the other hand, the wireless energy transmission structure 1 according to an embodiment of the present invention as described above is used to match the input and output matching circuit as shown in Figure 4 to reduce the power lost by the input and output terminals of the transceiver.

In this case, the input / output matching circuit includes a series inductor L and a parallel capacitor C1. The values of the inductor L are 3.07 μH and 3.90 μH, respectively, and the value of the capacitor C1 is 430 kΩ.

As such, the wireless energy transmission structure according to an embodiment of the present invention is illustrated in FIG. 4.

When combined with an input / output matching circuit, the measured values of operating characteristics can be obtained as shown in Table 1.

Operating characteristics unit result Resonant frequency MHz 35.5 35.6 Applied power dBm 11.5 11.5 Transmission distance m 0.3 0.5 Transmission gain dB -2.7 -12.1 Transmission efficiency % 53.7 6.2

That is, when the same power of 11.5dBm is applied at the transmission distance of 0.3m and 0.5m, the transmission gain at the transmission distance of 0.3m is about -2.7dB at the resonance frequency of 35.5MHz, and the transmission at the transmission distance of 0.5m The gain is about -12.1dB at a resonant frequency of 35.6MHz, the transmission efficiency is about 53.7% at a transmission distance of 0.3m, and about 6.2% at a transmission distance of 0.5m.

As can be seen in Table 1, it can be seen that the wireless energy transmission structure 1 increases the resonant frequency because the mutual capacitance decreases due to the weakening of the mutual coupling characteristics between the transmission and reception structures when the transmission distance between the transmission and reception ends becomes far.

In addition, it can be seen that the transmission efficiency drops sharply at the point where the transmission distance is 0.5m, since the coupling characteristic due to resonance between the wireless energy transmission and reception structures has sharply decreased from the point where the transmission distance is 0.5m.

However, the wireless energy transmission structure 1 according to the embodiment of the present invention as described above can increase the transmission efficiency because the meta cell 22 is formed in the wire part 20.

In other words, when formed in the same structure as the wireless energy transmission structure according to an embodiment of the present invention, but does not form a meta cell in the wire portion (that is, conventional wireless energy transmission structure) the operating characteristics are measured as shown in Table 2 The wireless energy transmission structure 1 according to an embodiment of the present invention has a transmission efficiency of about 11% at a transmission distance of 0.3 m and a transmission efficiency of about 2% at a transmission distance of 0.5 m, compared to a conventional wireless energy transmission structure. It can be seen that the improvement.

Operating characteristics unit result Resonant frequency MHz 41.8 42.7 Applied power dBm 11.5 11.5 Transmission distance m 0.3 0.5 Transmission gain dB -3.7 -13.6 Transmission efficiency % 42.66 4.37

As such, the wireless energy transmission structure 1 according to the embodiment of the present invention forms a metacell formed in the wire part 20 having a spiral resonance metamaterial structure, and thus has a resonance Q characteristic as compared with the conventional wireless energy transmission structure. Not only can it be improved, but also the transmission efficiency can be improved.

In addition, the wireless energy transmission structure 1 according to the embodiment of the present invention is because the mutual coupling characteristics are improved due to the metacell of the spiral resonant structure formed in the wire portion 20, so that the mutual capacitance is increased, the conventional wireless energy transmission structure. In comparison, the resonance frequency can be lowered, thereby reducing the size of the wireless energy transmission structure.

5 is a diagram illustrating a wireless energy transmission structure according to another embodiment of the present invention.

As shown in FIG. 5, the wireless energy transmission structure 1 according to another embodiment of the present invention has a ring-shaped printed circuit board 2, which is spaced apart from the printed circuit board 2 so as to be spaced a predetermined distance from each other. A disk portion 10 formed of a first conductor plate 12 and a second conductor plate 14 and a dielectric material 16 inserted between the first conductor plate 12 and the second conductor plate, and the printing A plurality of meta-cells 22 formed of a meta-material structure repeatedly formed to surround the inner and outer sides of the circuit board 2 and the first and second conductor plates 12 and 14, respectively. It is configured to include a wire portion 20 consisting of a transmission line 24 formed to surround the plurality of meta-cells (22).

Such a wireless energy transmission structure 1 according to another embodiment of the present invention is different from the wireless energy transmission structure according to an embodiment of the present invention shown in FIGS. Since the components are the same, the detailed description will be replaced with the above description.

Meanwhile, in the wireless energy transmission structure according to another embodiment of the present invention, the first meta cell 22a and the second meta cell 22b formed in the wire part 20 have a split ring structure as shown in FIG. 5. And the divided portions of the inner ring and the outer ring are formed opposite to each other (i.e., opposite).

As described above, the first meta cell 22a and the second meta cell 22b may have two split ring structures or one or three or more.

When the first meta cell 22a and the second meta cell 22b have three or more split ring structures, the divided parts of the split rings formed adjacent to each other are formed to face each other.

The wireless energy transmission structure 1 according to another embodiment of the present invention is combined with an input / output matching circuit as shown in FIG. 6, and operating characteristics thereof are the same as those of the wireless energy transmission structure according to the embodiment of the present invention shown in FIG. 1. Although similar, it has a lower resonance frequency than the wireless energy transmission structure according to the embodiment of the present invention.

1: wireless energy transmission structure 2: printed circuit board
10 disc portion 12, 14 conductor plate
16 dielectric material 18 resonant frequency compensation capacitor
20: wire part 22a, 22b: meta cell
24: Wire

Claims (16)

Ring-shaped printed circuit board;
A disk unit comprising a first conductor plate and a second conductor plate formed on the printed circuit board and a dielectric material interposed between the first conductor plate and the second conductor plate so as to be spaced apart from each other by a predetermined interval; And
A plurality of metacells formed of a metamaterial structure repeatedly formed to surround the inner and outer sides of the printed circuit board, and a transmission line connected to the first conductor plate and the second conductor plate and surrounding the plurality of metacells, respectively. Comprising a wire part,
And a dielectric constant of 4.4 and a thickness of 2.0 mm in FR4. Ring-shaped printed circuit board;
A disk unit comprising a first conductor plate and a second conductor plate formed on the printed circuit board and a dielectric material interposed between the first conductor plate and the second conductor plate so as to be spaced apart from each other by a predetermined interval; And
A plurality of metacells formed of a metamaterial structure repeatedly formed to surround the inner and outer sides of the printed circuit board, and a transmission line connected to the first conductor plate and the second conductor plate and surrounding the plurality of metacells, respectively. Comprising a wire part,
The disk unit is a wireless energy transmission device that the capacitor value is variable according to the resonance frequency. Ring-shaped printed circuit board;
A disk unit comprising a first conductor plate and a second conductor plate formed on the printed circuit board and a dielectric material interposed between the first conductor plate and the second conductor plate so as to be spaced apart from each other by a predetermined interval; And
A plurality of metacells formed of a metamaterial structure repeatedly formed to surround the inner and outer sides of the printed circuit board, and a transmission line connected to the first conductor plate and the second conductor plate and surrounding the plurality of metacells, respectively. Comprising a wire part,
The meta cell,
A first meta cell repeatedly formed to surround an inner portion of the printed circuit board; And
And a second meta cell repeatedly formed to surround the periphery of the printed circuit board. 4. The method according to any one of claims 1 to 3,
The printed circuit board is a wireless energy transmission device, characterized in that formed in the shape of a round or square ring. 4. The method according to any one of claims 1 to 3,
The printed circuit board has a ring portion having a width of 3 cm and a side length of 30 cm. The method according to claim 2,
And the disk unit varies a capacitor value by a resonant frequency compensation capacitor installed between the first conductor plate and the second conductor plate. 4. The method according to any one of claims 1 to 3,
And said dielectric material is air. 4. The method according to any one of claims 1 to 3,
And said dielectric material has a dielectric constant of 9.2. 4. The method according to any one of claims 1 to 3,
The width between the first conductor plate and the second conductor plate is 0.28 mm, the radius of the first conductor plate and the second conductor plate is 50 mm, and the width of the first conductor plate and the second conductor plate is 30 mm. Wireless energy transmission device, characterized in that. The method according to claim 3,
And the first meta cell and the second meta cell are connected to each other in parallel to form a pair. The method according to claim 3,
And a distance between the first meta cell and the second meta cell is 2.0 mm, and a distance between the line width and the lines of the first meta cell and the second meta cell is 1.0 mm. 4. The method according to any one of claims 1 to 3,
The meta-cell is a wireless energy transmission device, characterized in that formed in a circular or square. 4. The method according to any one of claims 1 to 3,
The meta-cell is a wireless energy transmission device, characterized in that the spiral structure. 4. The method according to any one of claims 1 to 3,
The meta cell has a split ring structure. The method according to claim 14,
The meta cell is formed of two or more split rings, wherein the divided portion of the split ring is formed in a position facing each other. 4. The method according to any one of claims 1 to 3,
The transmission line is a wireless energy transmission device, characterized in that the meta-cell is formed in an etched form.

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