WO2021241766A1 - Reradiation antenna and wireless charging device - Google Patents

Abstract

Disclosed are a reradiation antenna and a wireless charging device. The reradiation antenna comprises a first antenna and a second antenna. The first antenna comprises a first loop portion, a first connection portion, and a first branch portion, and the second antenna comprises a second loop portion, a second connection portion, and a second branch portion. The first antenna and the second antenna are spaced apart from each other and may be selectively activated. Even when a mobile terminal is placed on the wireless charging device in a different direction therefrom, wireless signal transmission can be effectively achieved between the reradiation antenna and the mobile terminal.

Description

Re-radiation antenna and wireless charging device

The present invention relates to a re-radiation antenna capable of receiving and re-radiating a radio signal, and a wireless charging device including the same.

In recent years, as high-rise buildings and interior spaces become more complex, shaded areas with poor radio wave environments are generated throughout the building in wireless communication systems. In addition, when located in a vehicle, the body is entirely made of metal, so that the transmission/reception rate of radio waves is reduced.

As a technique to solve this problem, the poor propagation environment was improved by using a repeater. The technology using a repeater is a technology to improve the propagation environment by using an active repeater that uses two antennas and a bidirectional amplifier circuit between them or a passive repeater that connects the two antennas with a coaxial cable or a waveguide.

More specifically, by installing an antenna outside a building or vehicle, and connecting this antenna to a re-radiation antenna installed inside a building or vehicle through a waveguide or coaxial cable, the radio wave environment in the shaded area can be improved.

However, since the technology using a repeater emits electromagnetic waves, there is a problem in that it affects nearby electronic devices, and in particular, when electronic equipment is densely packed inside, such as a vehicle, it affects other devices. In addition, it was difficult to apply to various communication standards having frequencies of different bands.

In order to solve this problem, Korean Patent No. 10-1594373 B1 (registration date: Feb. 5, 2016) discloses a re-radiation antenna and a wireless charging device. It receives the wireless signal and transmits it to the terminal.

One problem to be solved by the present invention is to provide a re-radiation antenna and a wireless charging device that can effectively transmit and receive wireless charging and wireless signals, even if the mobile terminal is placed in different directions on the wireless charging device.

Another object to be solved by the present invention is to provide a re-radiation antenna and a wireless charging device having excellent radiation efficiency for each frequency band, even if the mobile terminal is placed in different directions on the wireless charging device.

Another object to be solved by the present invention is to provide a re-radiation antenna and a wireless charging device in which the radiation characteristics of the re-radiation antenna can be varied according to the characteristics of the mobile terminal used.

A wireless charging device according to an embodiment of the present invention comprises a housing, a printed circuit board, a power transmission coil, a re-radiation antenna, and a first switch.

The printed circuit board is located inside the housing.

The power transmission coil is located inside the housing, and receives power from the printed circuit board to wirelessly transmit power to an external terminal.

The re-radiation antenna includes an insulating plate, a first antenna, and a second antenna.

The first switch is configured to connect any one of the first antenna and the second antenna to the printed circuit board so as to transmit and receive a signal.

The first antenna is formed on one surface of the insulating plate and is made of a conductive material.

The second antenna is formed on one side of the insulating plate, is made of a conductive material, and is spaced apart from the first antenna.

The first antenna and the second antenna may be formed on the same surface of the insulating plate.

The first antenna includes a first loop part, a first connection part, and a first branch part.

The first loop portion is formed in a closed loop (loop) shape. The first loop portion is formed in a form in which the ring is not broken, and both ends of the ring are connected to each other.

The first connection part protrudes outwardly of the first loop part.

The first branch portion is connected to the first connection portion, and both ends extend toward the second antenna.

The second antenna includes a second loop part, a second connection part, and a second branch part.

The second loop portion is formed in a closed loop (loop) shape. The second loop portion is formed in a form in which the ring is not broken, and both ends of the ring are connected to each other.

The second connection part protrudes outwardly of the second loop part.

The second branch part is connected to the second connection part, and both ends extend toward the first antenna.

The first antenna and the second antenna may form rotational symmetry with respect to a central axis perpendicular to the surface of the insulating plate.

A width of a line forming the first loop portion and the first connection portion may be smaller than a width of a line forming the first branch portion.

A width of a line forming the second loop portion and the second connection portion may be smaller than a width of a line forming the second branch portion.

The first loop part and the second loop part may each form a long rectangular shape in the first direction and be parallel to each other.

Based on a first virtual center line parallel to the first direction and passing between the first antenna and the second antenna, the first loop part and the second loop part are symmetrical to each other, and the first branch part and the The second branch portions may be symmetrical to each other.

The first connection part and the second connection part may be spaced apart from each other in opposite directions from an imaginary second center line that is parallel to a second direction orthogonal to the first direction and bisects the first loop part and the second loop part have.

The first branch portion may include a first central portion, a first extension portion, and a second extension portion.

The first central portion may be connected to the first connection portion, may be parallel to the first direction, and may have the same length as that of the first loop portion.

The first extension portion may extend from one end of the first central portion closer to the first connection portion than the second centerline toward the second antenna.

The second extension portion may extend toward the second antenna from one end of the first central portion that is farther from the first connection portion than the second center line.

The second branch portion may include a second central portion, a third extension portion, and a fourth extension portion.

The second central portion may be connected to the second connection portion, parallel to the first direction, and have the same length as the second loop portion.

The third extension portion may extend from one end of the second central portion closer to the second connection portion than the second centerline toward the first antenna.

The fourth extension portion may extend toward the first antenna from one end of the second central portion that is farther from the second connection portion than the second center line.

The re-radiation antenna may include a first protrusion and a second protrusion.

The first protrusion may be provided in plurality, protrude inward from the first loop and be spaced apart from each other at equal intervals.

The second protrusion may be provided in plurality, protrude inward from the second loop portion and be spaced apart from each other at equal intervals.

The first antenna comprises a first port.

The first port includes a first point located in the first central portion closer to the second extension than the first extension, and a second point adjacent to the first point in the first roof portion.

The second antenna comprises a second port.

The second port includes a third point located in the second central portion closer to the fourth extension than the third extension, and a fourth point adjacent to the third point in the second roof portion.

A signal is input from the printed circuit board to one of the first point and the second point, and the other is connected to the ground.

Among the third and fourth points, one receives a signal from the printed circuit board and the other is connected to the ground.

In the first antenna, the first point may be connected to a ground, and a signal may be input to the second point.

In the second antenna, the third point may be connected to a ground, and a signal from the fourth point may be input.

The wireless charging device may include a second switch and a third switch.

The second switch is configured to selectively connect a fifth point positioned on the first extension to the ground of the printed circuit board.

The third switch is configured to selectively connect a sixth point positioned on the third extension to the ground of the printed circuit board.

A wireless charging device according to an embodiment of the present invention includes a housing, a printed circuit board, a power transmission coil, a re-radiation antenna, and a first switch. The re-radiation antenna includes a first antenna and a second antenna, the first switch connects any one of the first antenna and the second antenna to the printed circuit board, and the first antenna and the second antenna selectively radiate radio waves can do. Accordingly, even if the mobile terminal is placed in different directions on the wireless charging device, and even if the mobile terminals having different structures are placed on the wireless charging device, the antenna coupling between the re-radiation antenna and each mobile terminal is excellent It can be done, and wireless charging and transmission and reception of wireless signals can be made effectively.

A first antenna according to an embodiment of the present invention includes a first loop portion, a first connection portion, a first branch portion, and a first protrusion, and the second antenna includes a second loop portion, a second connection portion, and a second branch portion. and a second protrusion. Accordingly, even if each mobile terminal is placed in different directions on the wireless charging device, it is possible to provide a re-radiation antenna and a wireless charging device that have excellent radiation efficiency for each frequency band, and particularly have excellent antenna matching in a high frequency band. can

The wireless charging device according to an embodiment of the present invention includes a second switch and a third switch, wherein the second switch selectively connects a fifth point located in the first extension and the ground of the printed circuit board, The 3 switch selectively connects the sixth point positioned on the third extension to the ground of the printed circuit board. Accordingly, it is possible to provide a re-radiation antenna and a wireless charging device in which the radiation characteristics of the re-radiation antenna can be varied according to the characteristics of the mobile terminal used, and excellent antenna matching in a low frequency band, a re-radiation antenna and a wireless charging device can provide

1 is a diagram illustrating the concept of a re-radiation antenna according to an embodiment of the present invention.

2 is a view showing a state in which the mobile terminal is mounted (placed) on the wireless charging device installed inside the vehicle.

3A and 3B are diagrams illustrating a state in which a mobile terminal is mounted on a wireless charging device according to an embodiment of the present invention.

4 is an exploded perspective view of a wireless charging device according to an embodiment of the present invention.

5 is a diagram schematically illustrating a connection relationship between components of a re-radiation antenna and a wireless charging device according to an embodiment of the present invention.

6 is a plan view illustrating a re-radiation antenna according to an embodiment of the present invention, and FIG. 7 is an S-parameter (reflection coefficient) graph showing the efficiency of the re-radiation antenna of FIG. 6 .

8 is a plan view illustrating a re-radiation antenna according to another embodiment of the present invention, and FIG. 9 is an S-parameter (reflection coefficient) graph showing the efficiency of the re-radiation antenna of FIG. 8 .

FIG. 10 is a diagram illustrating electric field distributions for each frequency band of the first antenna of FIG. 6 and the first antenna of FIG. 8 .

11 is a plan view illustrating a re-radiation antenna according to another embodiment of the present invention, and FIG. 12 is an S-parameter (reflection coefficient) graph showing the efficiency of the re-radiation antenna of FIG. 11 .

FIG. 13 is a diagram illustrating electric field distribution in the first antenna part of the re-radiation antenna of FIG. 11 .

14 is a diagram illustrating an electric field distribution for each frequency band of the re-radiation antenna of FIG. 8 .

15A, 15B, and 15C are each an S-parameter (reflection coefficient) graph showing the efficiency of the re-radiation antenna.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar reference numerals are assigned to the same or similar components, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

1 is a diagram showing the concept of a re-radiation antenna 200 of the present invention. In the mobile terminal 600 located inside the building or vehicle 400, the radio wave transmitted from the base station 500 collides with the building or is shielded by the metal forming the exterior of the vehicle 400, so that the radio wave transmission/reception rate may be significantly reduced. have. A place where radio waves are not partially transmitted is referred to as a shaded area, and a re-radiation antenna 200 may be provided in order to increase the radio wave transmission/reception rate in the shaded area.

An external antenna 300 is provided outside the vehicle 400 , and a re-radiation antenna 200 inside the vehicle 400 after the signal received from the external antenna 300 is amplified through a separate amplifier. It is possible to increase the radio wave transmission/reception rate of the mobile terminal 600 by transmitting it to the mobile terminal 600 located inside the vehicle 400 .

However, since the re-radiation antenna 200 transmits and receives signals using electromagnetic waves, it is greatly influenced by peripheral devices. Therefore, considering the relationship with other devices in the vicinity, it is necessary to arrange the re-radiation antenna 200 at a position that has little influence on other devices. However, when the distance from the mobile terminal 600 is far, there is a problem that the performance of the re-radiation antenna 200 is also reduced, and the effect of the re-radiation antenna 200 and peripheral devices can be minimized while reducing the distance from the mobile terminal 600. Research on the re-radiation antenna 200 is being made.

2 is a view showing a state in which the mobile terminal 600 is mounted (placed) on the wireless charging device 100 installed inside the vehicle 400 . The X, Y, and Z directions shown in the drawings may be directions orthogonal to each other, respectively.

In a state where the mobile terminal 600 is placed on the wireless charging device 1 , the battery of the mobile terminal 600 may be charged in a wireless charging method. The wireless charging method has the advantage of charging only by mounting the mobile terminal 600 on the wireless charging device 100 without connecting the wireless charging device 100 and the mobile terminal 600 with a cable. In addition, the inconvenience of having to separate the charging cable from the mobile terminal 600 every time it is used can be reduced.

Most of the mobile terminal 600 inside the vehicle 400 equipped with the wireless charging device 100 may be used in a state mounted on the wireless charging device 100 . In addition, since there is a high possibility of making a hands-free call using the Bluetooth function in a mounted state even during a call, the reception rate of the antenna signal is very important in a state where the mobile terminal 600 is seated on the wireless charging device 100 .

Therefore, in order to maximize the efficiency of the re-radiation antenna 200 inside the vehicle 400, the re-radiation antenna 200 must be close to the mobile terminal 600, so the re-radiation antenna 200 is a wireless charging device 100. It is better to have it on its own.

However, there is a problem that the re-radiation antenna 200 and the power transmission coil 140 of the wireless charging device 100 affect each other, and the present invention is between the power transmission coil 140 and the re-radiation antenna 200 . Provided are a re-radiation antenna 200 capable of minimizing the impact and a wireless charging device 100 having the same.

3A and 3B are diagrams illustrating a state in which the mobile terminal 600 is mounted on the wireless charging device 100 of the present invention. The mobile terminal 600 may include various wireless communication units. A broadcast receiving module for receiving a broadcast, a mobile communication module for mobile communication, a wireless Internet module for wireless Internet, a short-range wireless communication module for exchanging data with an external device located in a short distance in a wireless communication method, and a mobile terminal 600 There is a location information module for obtaining a location, and the like.

The broadcast receiving module receives a broadcast signal and broadcast related information from an external broadcast management server through a broadcast channel. The broadcast-related information may exist in various forms, for example, an Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or an Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H).

An antenna is required to receive such broadcast-related information, and in the case of a broadcast receiving module, a monopole type antenna that can be drawn in and out of the case of the mobile terminal 600 may be used.

The mobile communication module includes technical standards or communication methods for mobile communication (eg, GSM (Global System for Mobile communication), CDMA (Code Division Multi Access), CDMA2000 (Code Division Multi Access 2000)), EV-DO ( Enhanced Voice-Data Optimized or Enhanced Voice-Data Only), Wideband CDMA (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), Long Term (LTE-A) Evolution-Advanced), etc.), transmits and receives radio signals to and from at least one of a base station, an external terminal, and a server on a mobile communication network.

The wireless signal may include various types of data according to transmission/reception of a voice call signal, a video call signal, or a text/multimedia message. Since the antenna for mobile communication is in charge of the main function of the mobile terminal 600, it is also referred to as a main antenna. Since a different frequency is used for each technical standard of various mobile communication, the need for a broadband antenna is growing.

When a user makes a phone call, in many cases, the user puts the mobile terminal 600 directly to his or her ear. When the antenna is located in the upper part of the mobile terminal 600, since the transmission and reception of radio waves occurs close to the user's brain, the lower part 610 or the voice receiver of the mobile terminal 600 in order to keep this distance as far away as possible. Place the main antenna in an adjacent position.

In other wireless communication methods, since it is not often used in a state directly adjacent to the user's ear, the main antenna may be positioned on the upper part 620 or the rear surface of the mobile terminal 600 .

The wireless Internet module refers to a module for wireless Internet access, and may be built-in or external to the mobile terminal 600 . The wireless Internet module is configured to transmit and receive wireless signals in a communication network according to wireless Internet technologies.

The wireless Internet technology includes, for example, WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), Wi-Fi (Wireless Fidelity) Direct, etc., and the wireless Internet module includes Internet technologies not listed above. The range transmits and receives data according to at least one wireless Internet technology.

From the point of view that wireless Internet access by WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE, LTE-A, etc. is made through a mobile communication network, the wireless Internet module for performing wireless Internet access through the mobile communication network is the It may be understood as a type of mobile communication module.

The short-range communication module is for short-range communication, between the mobile terminal 600 and the wireless communication system through wireless area networks, and between the mobile terminal 600 and other mobile terminals 600, Alternatively, wireless communication between the mobile terminal 600 and a network in which another mobile terminal 600 or an external server is located may be supported. The local area network may be local area networks (Wireless Personal Area Networks).

The location information module is a module for acquiring the location (or current location) of the mobile terminal 600 , and a representative example thereof includes a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, if the mobile terminal 600 utilizes a GPS module, it may acquire the location of the mobile terminal 600 using a signal transmitted from a GPS satellite. As another example, when the mobile terminal 600 utilizes the Wi-Fi module, the location of the mobile terminal 600 is based on information of the Wi-Fi module and a wireless AP (Wireless Access Point) that transmits or receives a wireless signal. can be obtained.

Since other parts are located in the middle of the mobile terminal 600 , when the user is holding the mobile terminal 600 , radio waves are disturbed, thereby reducing the reception rate. It is common to divide them into .

Exceptionally, since the ultra-proximity antenna such as NFC or RFID is used in direct contact with the mobile terminal 600 , it may be positioned on the rear surface of the mobile terminal 600 .

4 is an exploded perspective view of the wireless charging device 100 of the present invention.

The wireless charging device 100 according to an embodiment of the present invention includes the housings 110a and 110b, the printed circuit board 120 , the power transmission coil 140 , the re-radiation antenna 200 and the first switch 150 . made including

The wireless charging device 100 may include a shield can 125 and a ferrite sheet 130 .

The printed circuit board 120 is a control unit of the wireless charging device 100 and is located inside the housings 110a and 110b.

The power transmission coil 140 is located inside the housings 110a and 110b, and receives power from the printed circuit board 120 to wirelessly transmit power to an external terminal (eg, the mobile terminal 600).

The housings 110a and 110b may include an upper housing 110a and a lower housing 110b, and the power transmission coil 140 and the re-radiation antenna 200 are mounted therein, and the power transmission coil ( A terminal for supplying power to be supplied to 140 , and a port for supplying an antenna signal received through the external antenna 300 located outside the vehicle 400 to the re-radiation antenna 200 may be provided.

A protrusion is formed around the upper surfaces of the housings 110a and 110b so that the mobile terminal 600 is seated on the upper surfaces of the housings 110a and 110b, or a material with high frictional force (non-woven fabric, silicone, rubber, etc.) is added to the upper surface of the mobile terminal. It is possible to prevent the 600 from being separated from the upper surface of the upper housing 110a.

The printed circuit board 120 receives external power and supplies it to the power transmission coil 140 , serves to transmit a signal received from the external antenna 300 to the re-radiation antenna 200 , and the printed circuit board 120 ) may be used as a control unit of the wireless charging device 100 . The upper surface of the printed circuit board 120 may further include a shield can 125 that radiates heat and provides a space for mounting components thereon.

In the power transmission coil 140 located on the printed circuit board 120 , when current flows, an electromagnetic field is formed, and current flows in the power reception coil of the external mobile terminal 600 by the electromagnetic field to charge the external mobile terminal 600 . can do. In this embodiment, the power transmission coil 140 is positioned on the shield can 125 .

There are two types of wireless charging methods: magnetic resonance and electromagnetic induction. The electromagnetic induction method is a method of charging an electronic device requiring charging using the principle of induced current. The current flowing in the power transmission coil 140 mounted in the portable charging device forms an electromagnetic field, and the power receiving coil located in the electromagnetic field is Electric current can flow by electromagnetic fields.

The magnetic resonance method uses a strong magnetic field coupling phenomenon formed between the power transmitting coil 140 and the power receiving coil having the same resonant frequency as a charging method using the resonance method, which is a phenomenon that vibrates with a large amplitude at a specific frequency.

Although the electromagnetic induction method has high efficiency, the power transmitting coil 140 and the power receiving coil must be located adjacent to each other, and when they are spaced apart or arranged at an angle, the efficiency is greatly reduced. Therefore, in the electromagnetic induction type charging, the arrangement between the power transmission coil 140 and the power reception coil is very important.

On the other hand, the magnetic resonance method has the advantage that the efficiency is not high compared to the electromagnetic induction method, but since it can be charged even at a distance, its use is not limited. In addition, the unused energy portion has the advantage of being reabsorbed into the electromagnetic field.

A ferrite sheet 130 may be further included on the upper or lower surface of the power transmission coil 140 . The ferrite sheet 130 may improve the circuit flow of the magnetic flux line of the coil, and may reduce the amount of electromagnetic radiation emitted from the power transmission coil 140 .

4, when the re-radiation antenna 200 is located on the upper surface of the power transmission coil 140, the re-radiation antenna 200 is formed of a conductive material, so that the magnetic force generated in the power transmission coil 140 is If it does not pass through the re-radiation antenna 200, the performance of the wireless charging device 100 is degraded.

It is difficult for the magnetic force radiated from the power transmission coil 140 to pass through the re-radiation antenna 200 and be transmitted to the power reception coil of the mobile terminal 600 . Accordingly, the magnetic force transfer efficiency to the mobile terminal 600 seated on the upper surface of the upper housing 110a may be reduced. Conversely, when the re-radiation antenna 200 is placed under the power transmission coil 140 , the signal radiated from the antenna is mixed with noise by the power transmission coil 140 , thereby deteriorating communication quality.

In order to solve the above problem, the present invention provides a re-radiation antenna 200 that is placed on the upper surface of the power transmission coil 140 and does not prevent the magnetic force transmitted from the power transmission coil 140 from being transmitted to the mobile terminal 600 . A radiation antenna 200 and a wireless charging device 100 having the same are provided.

5 is a diagram schematically illustrating a connection relationship between the components of the re-radiation antenna 200 and the wireless charging device 100 according to an embodiment of the present invention.

The re-radiation antenna 200 includes an insulating plate 210 , a first antenna 220 , and a second antenna 230 .

The insulating plate 210 includes an insulating resin or a thermosetting resin type insulating material. The insulating plate 210 is formed in a flat plate shape.

As described above, the mobile terminal 600 may include an antenna therein, and the antenna of the mobile terminal 600 may be provided in the upper 620 or lower 610 of the mobile terminal 600 .

The user may be mounted on the wireless charging device 100 so that the upper part 620 of the mobile terminal faces upward (see FIG. 3A ), or the wireless charging device 100 so that the lower part 610 of the mobile terminal faces upward. ) can be mounted on it (see FIG. 3b ).

The re-radiation antenna 200 and the wireless charging device 100 according to an embodiment of the present invention may have different antenna arrangement structures of the mobile terminal 600, and the direction in which the mobile terminal 600 is placed may be different. In consideration of the point, in each case, the antenna coupling efficiency between the re-radiation antenna 200 and the mobile terminal 600 is made to be excellent, and for this purpose, the re-radiation antenna 200 and the wireless charging device 100 is made including the first antenna 220 and the second antenna 230 .

The first switch 150 is configured to connect any one of the first antenna 220 and the second antenna 230 to the printed circuit board 120 .

When the first antenna 220 is connected to the printed circuit board 120 by the first switch 150 , the signal received from the external antenna 300 is transmitted toward the first antenna 220 and is radiated to the mobile terminal 600 . ) can be transferred.

In addition, when the second antenna 230 is connected to the printed circuit board 120 by the first switch 150 , the signal received from the external antenna 300 is transmitted toward the second antenna 230 and is radiated to the mobile terminal (600).

According to the size and type of each mobile terminal 600, the position and direction of each mobile terminal placed on the wireless charging device 100, and the frequency band used, the frequency size, etc., the first antenna 220 and the second antenna 230 ), any one of the antennas may show better transmission/reception efficiency of radio waves with the mobile terminal than the other antenna.

In this way, the control unit (printed circuit board) allows the radio wave to be radiated through the antenna (the first antenna 220 or the second antenna 230) showing the better transmission/reception efficiency of radio waves with the mobile terminal, so that the more efficient antenna Coupling may be made.

In the re-radiation antenna 200 and the wireless charging device 100 according to an embodiment of the present invention, a portion of the first antenna 220 is selective to the ground of the printed circuit board 120 through the second switch 160 can be grounded to When a portion of the first antenna 220 is grounded to the ground of the printed circuit board 120 and when not grounded, the antenna characteristics of the first antenna 220 are different from each other.

According to the size and type of the mobile terminal, the location and direction of the mobile terminal placed on the wireless charging device 100, and the frequency band used, the frequency size, etc., the first antenna 220 is a printed circuit through the second switch 160 When the substrate 120 is grounded and when it is not grounded, the transmission/reception efficiency of radio waves with the mobile terminal may be different from each other.

The control unit (printed circuit board) prevents the first antenna 220 from being grounded or grounded to the printed circuit board 120 through the second switch 160, so that a more efficient antenna between the first antenna 220 and the mobile terminal Coupling may be made.

In the re-radiation antenna 200 and the wireless charging device 100 according to an embodiment of the present invention, a portion of the second antenna 230 is selective to the ground of the printed circuit board 120 through the third switch 170 can be grounded to When a portion of the second antenna 230 is grounded to the ground of the printed circuit board 120 and when not grounded, the antenna characteristics of the second antenna 230 are different from each other.

According to the size and type of the mobile terminal, the location and direction of the mobile terminal placed on the wireless charging device 100, and the frequency band used, the frequency size, etc., the second antenna 230 is a printed circuit through the third switch 170 When the substrate 120 is grounded and when it is not grounded, the transmission/reception efficiency of radio waves with the mobile terminal may be different from each other.

The control unit (printed circuit board) prevents the second antenna 230 from being grounded or not grounded to the printed circuit board 120 through the third switch 170, so that a more efficient antenna between the second antenna 230 and the mobile terminal Coupling may be made.

6 is a plan view illustrating the re-radiation antenna 200 according to an embodiment of the present invention, and FIG. 7 is an S-parameter (reflection coefficient) graph showing the efficiency of the re-radiation antenna 200 of FIG. 6 .

The first antenna 220 is formed on one surface of the insulating plate 210 and made of a conductive material.

The second antenna 230 is formed on one side of the insulating plate 210 , is made of a conductive material, and is spaced apart from the first antenna 220 .

The first antenna 220 and the second antenna 230 may be formed by conventional exposure and etching of the copper thin film formed on the insulating plate 210 . Alternatively, the pattern shape of the first antenna 220 and the second antenna 230 may be formed on the insulating plate 210 by a printing method using a printer.

The first antenna 220 and the second antenna 230 may be formed on the same surface of the insulating plate 210 .

The first antenna 220 and the second antenna 230 are disposed along the periphery of the insulating plate 210 , and the antenna may not be provided at the center of the insulating plate 210 . The first antenna 220 and the second antenna 230 of the present invention may be formed at positions that do not overlap the power transmission coil 140 . That is, the central region 215 in which the first antenna 220 and the second antenna 230 are not formed is provided in the center of the insulating plate 210 . The central region 215 may overlap the power transmission coil 140 , and the area of the central region 215 may be larger than that of the power transmission coil 140 .

Accordingly, it is possible to prevent the transmission efficiency of the power transmitted from the power transmission coil 140 to the mobile terminal 600 located on the upper surface of the wireless charging device 100 from being lowered.

It is preferable that all of the first antenna 220 and the second antenna 230 do not overlap the power transmission coil 140 , but this may not be the case.

Each of the first antenna 220 and the second antenna 230 may be formed in a U-shape or U-shape, and may be formed to face each other.

The first antenna 220 includes a first loop part 221 , a first connection part 222 , and a first branch part 223 .

An antenna port (a first port 225 ) is connected to the first loop unit 221 and the first branch unit 223 . Among the first loop portion 221 and the first branch portion 223 , a positive portion of the first port 225 is connected to one of the first loop portion 221 and the first branch portion 223 , and a negative portion of the first port 225 is connected to the other one. One of the first loop unit 221 and the first branch unit 223 is fed (signal input) and the other is grounded.

The first loop portion 221 is formed in a closed loop (loop) shape. The first loop portion 221 is formed in a form in which the ring is not broken, and both ends of the ring are connected to each other.

The first loop part 221 may be formed along either edge of the insulating plate 210 . The first loop part 221 may be formed along the lower edge of the insulating plate 210 , and accordingly, the first loop part 221 may form the lower edge of the re-radiation antenna 200 .

The first loop part 221 may be formed in a rectangular shape, and may be formed in a rectangular shape long horizontally (in the first direction (X)). The horizontal length (a1) of the first loop part 221 is made longer than the vertical length (b1), and the horizontal length (a1), the vertical length (b1), and the horizontal length (a1) and the vertical length (b1) ) ratio (a1/b1) may be made variously depending on the size of the wireless charging device 100, the antenna characteristics of the applied mobile terminal, the characteristics of the frequency used, and the like.

The first connection part 222 protrudes outwardly of the first loop part 221 .

The first connection part 222 is a part that connects the first loop part 221 and the first branch part 223 to each other. The first connection part 222 may have a very short length compared to the first loop part 221 and the first branch part 223 .

The first connection part 222 protrudes from the first loop part 221 toward the second antenna 230 . In the entire re-radiation antenna 200 , the first connection part 222 is located inside the first loop part 221 .

The first branch part 223 is connected to the first connection part 222 , and both ends thereof extend toward the second antenna 230 .

The second antenna 230 includes a second loop part 231 , a second connection part 232 , and a second branch part 233 .

An antenna port (a second port 235 ) is connected to the second loop unit 231 and the second branch unit 233 . Among the second loop portion 231 and the second branch portion 233 , a positive portion of the second port 235 is connected to one of the second loop portions 231 and the second branch portion 233 , and a negative portion of the second port 235 is connected to the other one. One of the second loop portion 231 and the second branch portion 233 is fed (signal input) and the other is grounded with the ground.

The second loop portion 231 is formed in a closed loop (loop) shape. The second loop portion 231 is formed in a form in which the ring is not broken, and both ends of the ring are connected to each other.

The second loop part 231 may be formed along either edge of the insulating plate 210 . In the re-radiation antenna 200 , the second loop part 231 may form an edge opposite to the first loop part 211 . The second loop part 231 may be formed along the upper edge of the insulating plate 210 , and accordingly, the second loop part 231 may form the upper edge of the re-radiation antenna 200 . The second loop part 231 may have a rectangular shape, and may have a horizontal (first direction (X)) long rectangular shape.

The second loop part 231 may form a symmetry with the first loop part 221 .

The second connection part 232 protrudes outward of the second loop part 231 .

The second connection part 232 is a part that connects the second loop part 231 and the second branch part 233 to each other. The second connection part 232 may have a very short length compared to the second loop part 231 and the second branch part 233 .

The second connection part 232 protrudes from the second loop part 231 toward the first antenna 220 . In the entire re-radiation antenna 200 , the second connection part 232 is located inside the second loop part 231 .

The second branch portion 233 is connected to the second connection portion 232 , and both ends extend toward the first antenna 220 .

The first antenna 220 and the second antenna 230 are rotationally symmetric with each other based on the central axis CP (which may be parallel to the third direction Z) perpendicular to the surface of the insulating plate 210 . can

The width of the line forming the first loop portion 221 and the first connection portion 222 may be smaller than the widths w1 and w2 of the line forming the first branch portion 223 .

The width of the line forming the second loop portion 231 and the second connection portion 232 may be smaller than the width of the line forming the second branch portion 233 .

The first loop part 221 and the second loop part 231 may each form a long rectangular shape in the first direction (X) and be parallel to each other.

Based on a first virtual center line CL1 parallel to the first direction X and passing between the first antenna 220 and the second antenna 230, the first loop part 221 and the second loop part ( 231 may be symmetrical to each other, and the first branch part 223 and the second branch part 233 may be symmetrical to each other.

The first connection part 222 and the second connection part 232 are parallel to the second direction Y orthogonal to the first direction X and bisect the first loop part 221 and the second loop part 231 . may be spaced apart from each other in opposite directions from the imaginary second center line CL2 .

The length L1 from one end of the first loop part 221 to the first connection part 222 is greater than 0, and is made less than half of the horizontal length a1 of the first loop part 221 . The length L1 may be variously made according to the size of the wireless charging device 100, the antenna characteristics of the applied mobile terminal, the characteristics of the frequency used, and the like.

The first branch portion 223 may include a first central portion 223a, a first extension portion 223b, and a second extension portion 223c.

The first central portion 223a may be connected to the first connection portion 222 , may be parallel to the first direction X, and may have the same length as the first loop portion 221 . The first central portion 223a may be spaced apart from the first loop portion 221 and located very close to the first loop portion 221 .

The first extension portion 223b may extend from one end of the first central portion 223a closer to the first connection portion 222 than the second center line CL2 toward the second antenna 230 .

The first extension 223b may be formed along one edge of the insulating plate 210 . The first extension 223b may be formed substantially parallel to the second center line CL2 .

The length L3 of the first extension 223b may be varied according to the antenna characteristics of the applied mobile terminal, the characteristics of the frequency used, and the like.

The second extension portion 223c may extend toward the second antenna 230 from one end of the first central portion 223a that is farther from the first connection portion 222 than the second center line CL2 .

The second extension 223c may be formed along one edge of the insulating plate 210 . The second extension portion 223c may be formed substantially parallel to the second center line CL2 .

When the first loop part 221 and the first central part 223a are formed on the lower edge of the re-radiation antenna 200 , the first extension part 223b may be formed on the left edge of the re-radiation antenna 200 . In addition, the second extension 223c may be formed on the right edge of the re-radiation antenna 200 .

The second extension 223c may be symmetrical with the first extension 223b.

The length L4 of the second extension 223c may vary depending on the antenna characteristics of the applied mobile terminal, the characteristics of the frequency used, etc., and the length L4 of the second extension 223c is the first The length L3 of the extension part 223b may be the same.

The second branch portion 233 may include a second central portion 233a, a third extension portion 233b, and a fourth extension portion 233c.

The second central portion 233a may be connected to the second connection portion 232 , may be parallel to the first direction X, and may have the same length as the second loop portion 231 . The second central portion 233a may be spaced apart from the second loop portion 231 and located very close to the second loop portion 231 .

The third extension portion 233b may extend from one end of the second central portion 233a closer to the second connection portion 232 than the second centerline CL2 toward the first antenna 220 .

The fourth extension portion 233c may extend toward the first antenna 220 from one end of the second central portion 233a that is farther from the second connection portion 232 than the second center line CL2 .

The second branch portion 233 may be symmetrical with the first branch portion 223 . Accordingly, the second central portion 233a is symmetrical to the first central portion 223a, the third extended portion 233b is symmetrical to the first extended portion 223b, and the fourth extended portion 233c is the second It may form a symmetry with the extension part 223c.

The first antenna 220 includes a first port 225 .

The first port 225 is connected to a first point 225a located in the first central portion 223a closer to the second extension portion 223c than to the first extension portion 223b, and from the first loop portion 221 . and a second point 225b adjacent to the first point 225a.

The first port 225 may be formed on the opposite side of the first connection part 222 with respect to the second center line CL2 .

A signal is input from the printed circuit board to one of the first point 225a and the second point 225b, and the other is connected to the ground.

In an embodiment, the first point 225a of the first antenna 220 may be connected to the ground, and the second point 225b of the first antenna 220 may be connected to a power source. The first point 225a and the second point 225b are spaced apart from each other with a predetermined interval. A current supplied from a power source flows along the first antenna 220 to generate a radio wave having a specific wavelength. The wavelength is determined by the supplied current, the pattern of the first antenna 220, and the length and shape of each part.

The length L2 from one end of the first loop portion 221 to the first port 225 is less than half of the horizontal length a1 of the first loop portion 221 . The length L2 may be made variously according to the antenna characteristics of the applied mobile terminal, the characteristics of the frequency used, and the like.

When the first antenna 220 is connected to the printed circuit board 120 by the first switch 150 , the signal received from the external antenna 300 is transmitted toward the first antenna 220 through the first port 225 . transmitted and radiated.

The second antenna 230 includes a second port 235 .

The second port 235 is connected to a third point 235a located in the second central portion 233a closer to the fourth extension 233c than to the third extension 233b, and at the second loop portion 231 . and a fourth point 235b adjacent to the third point 235a.

The second port 235 may be formed on the opposite side of the second connection part 232 with respect to the second center line CL2 .

A signal is input from the printed circuit board to one of the third point 235a and the fourth point 235b, and the other is connected to the ground.

In an embodiment, the third point 235a of the second antenna 230 may be connected to the ground, and the fourth point 235b of the second antenna 230 may be connected to a power source. The third point 235a and the fourth point 235b are spaced apart from each other with a predetermined interval. A current supplied from a power source flows along the second antenna 230 to generate a radio wave having a specific wavelength. The wavelength is determined by the supplied current, the pattern of the second antenna 230, and the length and shape of each part.

When the second antenna 230 is connected to the printed circuit board 120 by the first switch 150 , the signal received from the external antenna 300 is transmitted toward the second antenna 230 through the second port 235 . transmitted and radiated.

7 is a graph illustrating the performance of the re-radiation antenna 200 as in the structure of FIG. 6 , wherein the horizontal axis indicates frequency and the vertical axis indicates S-parameter (reflection coefficient). The reflection coefficient is a ratio of the intensity of an incident signal to a signal reflected and output in a decibel region, and since the intensity of a signal reflected and output is small, the reflection coefficient is negative.

In the re-radiation antenna 200 of FIG. 6 , the first antenna 220 and the second antenna 230 are symmetric to each other. FIG. 7 may be a graph showing the antenna performance of the first antenna 220 and may be a graph showing the antenna performance of the second antenna 230 .

The smaller the reflection coefficient, the greater the strength of the reflected signal, and the magnitude of the reflection coefficient near the mobile communication frequencies (900 MHz, 1800 MHz, 2100 MHz and 2700 MHz) used in 3G communication is important.

7, it can be confirmed that the re-radiation antenna 200 according to the embodiment of the present invention has excellent reflection coefficient characteristics in the mid-frequency (1800-2100 MHz) band.

8 is a plan view showing the re-radiation antenna 200 according to another embodiment of the present invention, and FIG. 9 is an S-parameter (reflection coefficient) graph showing the efficiency of the re-radiation antenna 200 of FIG. 8 .

In order to increase signal efficiency in the mobile communication frequency bands (900 MHz, 1800 MHz, 2100 MHz and 2700 MHz), the re-radiation antenna 200 may include a first protrusion 224 and a second protrusion 234 .

The first protrusion part 224 may be provided in plurality, protrude inward from the first loop part 221 and be spaced apart from each other at equal intervals. The number of the first protrusions 224, the protrusion height w3, the width w4 and the spacing L5 are, according to the size of the wireless charging device 100, the antenna characteristics of the applied mobile terminal, the characteristics of the frequency used, etc. It can be done in various ways.

The number and spacing L5 of the first protrusion 224 may decrease as the size of the wireless charging device 100 increases, and may increase as the size of the wireless charging device 100 decreases.

The second protrusion 234 may be provided in plurality, protrude inward from the second loop portion 231 and be spaced apart from each other at equal intervals.

The plurality of second protrusions 234 may be symmetrical with the plurality of first protrusions 224 .

Referring to FIG. 9 , signals appear relatively large in mobile communication frequency bands (900 MHz, 1800 MHz, 2100 MHz, and 2700 MHz). If the size, length, and spacing of the first protrusion 224 and/or the second protrusion 234 are adjusted, the efficiency of the re-radiation antenna 200 shown in FIG. 8 is changed, and is particularly large in the mobile communication frequency band. You can adjust the length and size of the gap.

Each of (a), (b) and (c) of FIG. 10 is a diagram illustrating an electric field distribution for each frequency band of the first antenna 220 of FIG. 6, (d), (e) and (f) of FIG. ) is a diagram illustrating an electric field distribution for each frequency band of the first antenna 220 of FIG. 8 . The intensity of the electric field is large in the dark colored part, and the efficiency of the electric field is high.

When the terminal 600 is placed on the wireless charging device 100 so that the lower part 610 of the mobile terminal 600 faces downward (this state, it is assumed that the mobile terminal 600 is placed in the correct position. See Fig. 3a ), the lower portion 610 of the mobile terminal 600 may be placed directly above the first loop portion 221 of the first antenna 220 . In this case, since the strength of the electric field is high in all frequency bands in the portion where the lower portion of the mobile terminal 600 is located, the antenna coupling efficiency may be excellent when the mobile terminal 600 is mounted in a fixed position.

In addition, according to FIG. 10, when the first protrusion 224 is formed on the first antenna 220, it can be seen that the strength of the electric field is strong in the plurality of first protrusions 224 portions, and the first protrusion ( 224), a more uniform and strong electric field can be formed, and an area for antenna coupling can be further expanded.

When the terminal 600 is placed on the wireless charging device 100 so that the lower part 610 of the mobile terminal 600 faces upward (this state, the mobile terminal 600 is placed in the reverse position. See Fig. 3b ), the lower portion 610 of the mobile terminal 600 may be placed directly above the second loop portion 231 of the second antenna 230 . Even at this time, the strength of the electric field in the portion where the lower portion of the mobile terminal 600 is located appears high in all frequency bands, and when the mobile terminal 600 is mounted in an inverted position, the antenna coupling efficiency may be excellent.

11 is a plan view illustrating a re-radiation antenna according to another embodiment of the present invention, FIG. 12 is an S-parameter (reflection coefficient) graph showing the efficiency of the re-radiation antenna of FIG. 11, and FIG. It is a figure showing the electric field distribution in the first antenna part of the re-radiation antenna.

The wireless charging device 100 may include a second switch 160 and a third switch 170. (See FIG. 5)

The second switch 160 is configured to selectively connect the fifth point 226 positioned on the first extension 223b to the ground of the printed circuit board.

The third switch 170 is configured to selectively connect a sixth point 236 located in the third extension part 233b to the ground of the printed circuit board.

The fifth point 226 positioned on the first extension part 223b and the sixth point 236 positioned on the third extension part 233b may form a symmetry with each other.

The length L6 from the lower end of the first extension 223b to the fifth point 226 may vary depending on the size of the wireless charging device 100, the antenna characteristics of the applied mobile terminal, the characteristics of the frequency used, and the like. can be done

In FIG. 12 , ⓒ denotes a case in which the fifth point 226 of the first antenna 220 is grounded to the ground, and ⓓ denotes a case in which the fifth point 226 of the first antenna 220 is not grounded to the ground. .

Referring to FIG. 12 , when the fifth point 226 of the first antenna 220 is grounded to the ground and when not grounded, it can be seen that the magnitude of the reflection coefficient is different from each other in the mobile communication frequency band, and in particular , it can be seen that there is a difference in the signal in the low frequency band (800 MHz to 1000 MHz).

13 is a diagram illustrating an electric field distribution of the first antenna 220 at a frequency of 800 MHz. In FIG. 13, (a) is a case in which the fifth point 226 of the first antenna 220 is not grounded to the ground (off) at the 800 MHz frequency, (b) is the fifth point of the first antenna 220 In the case where 226 is grounded to the ground (on), in particular, it can be seen that the intensity of the electric field is different from each other in the first extension 223b and the second extension 223c.

As such, when the fifth point 226 of the first antenna 220 is not grounded and grounded, the reflection coefficient characteristics are different from each other, and in particular, the reflection coefficient characteristics are different in the low frequency band. It is possible to provide a re-radiation antenna and a wireless charging device suitable for a mobile terminal.

For example, in the case of any first mobile terminal, when the fifth point 226 of the first antenna 220 is not grounded to the ground, the path loss in the low frequency band may be further lowered, and another arbitrary second In the case of a mobile terminal, when the fifth point 226 of the first antenna 220 is grounded to the ground, path loss in a low frequency band may be further reduced.

(a), (b), (c), (d) and (e) of FIG. 14 are diagrams illustrating electric field distribution for each frequency band of the re-radiation antenna 200 of FIG. 8 .

When the mobile terminal antenna is formed in the lower part of the mobile terminal 600, and when the terminal is placed on the wireless charging device 100 so that the lower part of the mobile terminal 600 faces downward, the lower part of the mobile terminal 600 is located Since the strength of the electric field in the portion (the first loop portion 221 of the first antenna 220) is high in all frequency bands, the antenna coupling efficiency is excellent when the mobile terminal 600 is mounted in a fixed position. may appear

In addition, when the mobile terminal antenna is formed in the lower portion of the mobile terminal 600, and when the terminal is placed on the wireless charging device 100 so that the lower portion of the mobile terminal 600 faces upward, the lower portion of the mobile terminal 600 Since the strength of the electric field in the portion (second loop portion 231 of the second antenna 230) is high in all frequency bands, even when the mobile terminal 600 is mounted in an inverted position, the antenna coupling efficiency is reduced. can appear excellent.

15A, 15B, and 15C are S-parameter (reflection coefficient) graphs showing the efficiency of the re-radiation antenna.

15A is a graph of reflection coefficients in relation to an arbitrary first mobile terminal. In FIG. 15A, ⓔ is a case in which the fifth point 226 of the first antenna 220 is grounded to the ground, and ⓕ is the first antenna. The fifth point 226 of 220 is not grounded to the ground.

15B is a graph of reflection coefficients in relation to an arbitrary second mobile terminal. In FIG. 15B, ⓖ is a case where the fifth point 226 of the first antenna 220 is grounded to the ground, and ⓗ is the first antenna. The fifth point 226 of 220 is not grounded to the ground.

FIG. 15C is a graph of reflection coefficients in relation to a third mobile terminal. In FIG. 15C, ⓘ is a case in which the fifth point 226 of the first antenna 220 is grounded to the ground, and ⓙ is the first antenna. The fifth point 226 of 220 is not grounded to the ground.

As such, in the case of the re-radiation antenna 200 and the wireless charging device 100 according to an embodiment of the present invention, matching in each mobile communication frequency band (900 MHz, 1800 MHz, 2100 MHz and 2700 MHz) in relation to several other mobile terminals ( matching) is excellent.

Table 1 shows the path loss between the re-radiation antenna and the first group of mobile terminals according to the embodiment of the present invention for each frequency band. The case of the forward and reverse positions of the terminal was divided, and the uplink and the downlink were displayed separately.

		Phone Position
		Forward	Reverse
LTE 800	Up Link	8.6 dB	9.6 dB
	Down Link	10.9 dB	11.2 dB
LTE 900	Up Link	6.8 dB	8.5 dB
	Down Link	7.4 dB	9.2 dB
LTE 1800	Up Link	12.8 dB	12.5 dB
	Down Link	13.6 dB	13.1 dB
LTE 2100	Up Link	13.7 dB	11.8 dB
	Down Link	14.9 dB	12.3 dB
LTE 2600	Up Link	13.6 dB	15.7 dB
	Down Link	13.2 dB	15.5 dB
AVERAGE	11.7 dB

Here, the mobile terminals of the first group are mobile terminals with a relatively high sales ratio in 2017 and 2018 (a mobile phone brand and series of company A, a mobile phone brand and series of company B, It is a mobile phone brand and series of Company C).

As shown in Table 1, the average value of the path loss between the re-radiation antenna and the mobile terminals according to the embodiment of the present invention is about 11.5 dB when the mobile terminals are placed in a forward position, and the mobile terminal It can be seen that the average value is about 11.9 dB when they are placed in the reverse position, and the deviation of the path loss value when the mobile terminal is placed in the normal position and the reverse position is very small, and stable antenna characteristics in all cases. It can be seen that indicates

In addition, the overall path loss of the forward and reverse positions is about 11.7 dB, which is an excellent value compared to other conventional re-radiation antennas.

Table 2 shows the path loss between the re-radiation antenna and the mobile terminal of the second group according to the embodiment of the present invention for each frequency band. The case of the forward and reverse positions of the terminal was divided, and the uplink and the downlink were displayed separately.

		Phone Position
		Forward	Reverse
LTE 800	Up Link	9.5 dB	9.5 dB
	Down Link	10.9 dB	10.4 dB
LTE 900	Up Link	7.6 dB	7.9 dB
	Down Link	10.8 dB	11.0 dB
LTE 1800	Up Link	9.6 dB	8.7 dB
	Down Link	12.1 dB	11.6 dB
LTE 2100	Up Link	12.9 dB	12.7 dB
	Down Link	17.9 dB	17.3 dB
LTE 2600	Up Link	15.4 dB	16.6 dB
	Down Link	16.5 dB	17.5 dB
AVERAGE	12.3 dB

Here, the mobile terminals of the second group include mobile terminals with a relatively high sales proportion (a mobile phone brand and series of company A, a mobile phone brand and series of company B, and a mobile phone brand and series of company C). of mobile phone brands and series).

As shown in Table 2, the average value of the path loss between the re-radiation antenna and the mobile terminals according to the embodiment of the present invention is about 12.3 dB when the mobile terminals are placed in a forward position, and the mobile terminal It can be seen that the average value is about 12.3 dB when they are placed in the reverse position, and the path loss value is almost the same when the mobile terminal is placed in the normal position and in the reverse position, indicating stable antenna characteristics in all cases. can be known

In addition, the overall path loss in the forward and reverse positions is about 12.3 dB, and it can be seen that this is an excellent value even compared to other conventional re-radiation antennas.

In the foregoing, specific embodiments of the present invention have been described and illustrated, but the present invention is not limited to the described embodiments, and those of ordinary skill in the art may make various changes to other specific embodiments without departing from the spirit and scope of the present invention. It will be appreciated that modifications and variations are possible. Accordingly, the scope of the present invention should not be defined by the described embodiments, but should be defined by the technical idea described in the claims.

Re-radiation antenna and wireless charging device according to an embodiment of the present invention, in that wireless charging and transmission and reception of wireless signals can be made effectively, industrial applicability is remarkable.

Claims (20)

1. insulation plate;

   a first antenna formed on one side of the insulating plate and made of a conductive material; and

   A second antenna formed on one side of the insulating plate, made of a conductive material, and spaced apart from the first antenna,

   The first antenna is

   A first loop portion of a closed loop (loop) shape;

   a first connection part protruding outward from the first loop part; and

   It is connected to the first connection part and includes a first branch part having both ends extending toward the second antenna,

   The second antenna,

   A second loop portion of the closed loop (loop) shape;

   a second connection part protruding outward from the second loop part; and

   It is connected to the second connection part and includes a second branch part having both ends extending toward the first antenna,

   re-radiating antenna.
2. According to claim 1,

   The first antenna and the second antenna are rotationally symmetrical to each other with respect to a central axis perpendicular to the plane of the insulating plate,

   re-radiating antenna.
3. According to claim 1,

   A width of a line forming the first loop portion and the first connection portion is smaller than a width of a line forming the first branch portion,

   A width of a line forming the second loop portion and the second connection portion is smaller than a width of a line forming the second branch portion,

   re-radiating antenna.
4. According to claim 1,

   The first loop part and the second loop part each form a long rectangular shape in the first direction and are parallel to each other,

   re-radiating antenna.
5. 5. The method of claim 4,

   Based on a first virtual center line parallel to the first direction and passing between the first antenna and the second antenna, the first loop part and the second loop part are symmetrical to each other, and the first branch part and the The second branch portions are symmetrical to each other,

   re-radiating antenna.
6. 5. The method of claim 4,

   The first connection part and the second connection part,

   spaced apart from each other from a second imaginary center line parallel to a second direction orthogonal to the first direction and bisecting the first loop portion and the second loop portion,

   re-radiating antenna.
7. 7. The method of claim 6,

   The first branch unit,

   a first central portion connected to the first connection portion and parallel to the first direction and having the same length as that of the first loop portion;

   a first extension portion extending toward the second antenna from one end of the first central portion closer to the first connection portion than the second center line; and

   and a second extension portion extending toward the second antenna from one end of the first central portion that is farther from the first connection portion than the second center line,

   The second branch unit,

   a second central portion connected to the second connection portion and parallel to the first direction and having the same length as that of the second loop portion;

   a third extension portion extending from one end of the second central portion closer to the second connection portion than the second centerline toward the first antenna; and

   Comprising a fourth extension portion extending toward the first antenna from one end of the second central portion that is farther from the second connection portion than the second center line,

   re-radiating antenna.
8. 6. The method of claim 5,

   The first antenna is

   and a plurality of first protrusions protruding inward from the first loop and spaced apart from each other at equal intervals,

   The second antenna,

   Containing a plurality of second projections protruding inward from the second loop portion and spaced apart from each other at equal intervals,

   re-radiating antenna.
9. 8. The method of claim 7,

   The first antenna is

   A first port including a first point located in the first central portion closer to the second extension than the first extension and a second point adjacent to the first point in the first loop portion,

   The second antenna,

   A second port including a third point located in the second central portion closer to the fourth extension than the third extension and a fourth point adjacent to the third point in the second loop portion,

   A signal is input to one of the first point and the second point and the other is connected to the ground,

   Among the third point and the fourth point, one is inputted with a signal and the other is connected to the ground,

   re-radiating antenna.
10. 8. The method of claim 7,

    The first antenna is

    a first point located in the first central portion closer to the second extension portion than the first extension portion and connected to the ground; and a second point adjacent to the first point in the first loop portion and to which a signal is input. including a first port to

    The second antenna,

    a third point located in the second central part closer to the fourth extension part than the third extension part and connected to the ground; and a fourth point adjacent to the third point in the second loop part and to which a signal is input. including a second port to

    re-radiating antenna.
11. housing;

    a printed circuit board positioned inside the housing;

    a power transmission coil located inside the housing, receiving power from the printed circuit board and wirelessly transmitting power to an external terminal; and

    The first antenna is configured to receive an antenna signal from the printed circuit board and radiate it again, an insulating plate, a first antenna made of a conductive material on one side of the insulating plate, and a conductive material on one side of the insulating plate, the first antenna and a re-radiation antenna comprising a second antenna spaced apart from each other; and

    A first switch for connecting any one of the first antenna and the second antenna to the printed circuit board so as to transmit and receive a signal,

    wireless charging device.
12. 12. The method of claim 11,

    The first antenna is

    A first loop portion of a closed loop (loop) shape;

    a first connection part protruding outward from the first loop part; and

    It is connected to the first connection part and includes a first branch part having both ends extending toward the second antenna,

    The second antenna,

    A second loop portion of the closed loop (loop) shape;

    a second connection part protruding outward from the second loop part; and

    It is connected to the second connection part and includes a second branch part having both ends extending toward the first antenna,

    wireless charging device.
13. 13. The method of claim 12,

    The first antenna and the second antenna are rotationally symmetrical to each other with respect to a central axis perpendicular to the plane of the insulating plate,

    wireless charging device.
14. 13. The method of claim 12,

    The first loop part and the second loop part each form a long rectangular shape in the first direction and are parallel to each other,

    wireless charging device.
15. 15. The method of claim 14,

    Based on a first virtual center line parallel to the first direction and passing between the first antenna and the second antenna, the first loop part and the second loop part are symmetrical to each other, and the first branch part and the The second branch portions are symmetrical to each other,

    wireless charging device.
16. 15. The method of claim 14,

    The first connection part and the second connection part,

    spaced apart from each other from a second imaginary center line parallel to a second direction orthogonal to the first direction and bisecting the first loop portion and the second loop portion,

    wireless charging device.
17. 17. The method of claim 16,

    The first branch unit,

    a first central portion connected to the first connection portion and parallel to the first direction and having the same length as that of the first loop portion;

    a first extension portion extending toward the second antenna from one end of the first central portion closer to the first connection portion than the second center line; and

    and a second extension portion extending toward the second antenna from one end of the first central portion that is farther from the first connection portion than the second center line,

    The second branch unit,

    a second central portion connected to the second connection portion and parallel to the first direction and having the same length as that of the second loop portion;

    a third extension portion extending from one end of the second central portion closer to the second connection portion than the second centerline toward the first antenna; and

    Comprising a fourth extension portion extending toward the first antenna from one end of the second central portion that is farther from the second connection portion than the second center line,

    wireless charging device.
18. 16. The method of claim 15,

    a plurality of first protrusions protruding inward from the first loop and spaced apart from each other; and

    Containing a plurality of second projections protruding inward from the second loop portion and spaced apart from each other,

    wireless charging device.
19. 18. The method of claim 17,

    The first antenna is

    a first point located in the first central portion closer to the second extension portion than the first extension portion and connected to the ground; and a second point adjacent to the first point in the first loop portion and to which a signal is input. including a first port to

    The second antenna,

    a third point located in the second central part closer to the fourth extension part than the third extension part and connected to the ground; and a fourth point adjacent to the third point in the second loop part and to which a signal is input. including a second port to

    wireless charging device.
20. 18. The method of claim 17,

    a second switch selectively connecting a fifth point positioned on the first extension to a ground of the printed circuit board; and

    including a third switch selectively connecting a sixth point located in the third extension portion and a ground of the printed circuit board;

    wireless charging device.

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