KR101594373B1 - Reradiation antenna and wireless charger - Google Patents

Abstract

According to an aspect of the present invention, A grounding portion formed on one surface of the insulating plate and connected to a ground; A slit having an open end formed by removing a part of the ground portion to expose one surface of the insulating plate; A feeder positioned between the slits and spaced apart from the ground by a predetermined distance, the feeder being formed on the insulating plate and having one end connected to a power source; And a radiating part connected to the other end of the feeding part located at an open end of the slit and formed on one surface of the insulating plate, .

Description

TECHNICAL FIELD [0001] The present invention relates to a re-radiating antenna and a wireless recharging device,

The present invention relates to a re-radiating antenna capable of receiving and re-radiating a radio signal, and a wireless recharging device in which a re-radiating antenna does not deteriorate wireless charging performance.

In recent years, high-rise buildings and interior spaces have become increasingly complicated, resulting in shaded areas in the interior of buildings with poor radio wave conditions in wireless communication systems. Further, when the vehicle body is located in the vehicle, the transmission / reception ratio of the radio wave is reduced because the vehicle body is entirely made of metal.

As a technique to solve such a problem, a repeater is used to improve a poor radio wave environment. Intermediary technology is a technology that improves the propagation environment by using two antennas, active repeaters using bi-directional amplification circuits therebetween, and passive repeaters connecting two antennas with coaxial cables or wave guides.

More specifically, it is possible to improve the propagation environment of a shaded area by installing an antenna on the outside of a building or a vehicle, and connecting the antenna to a re-radiating antenna installed in a building or a vehicle through a waveguide or a coaxial cable.

However, the technology using the repeater emits electromagnetic waves, thus affecting the surrounding electronic devices. Especially, when electronic equipment such as a vehicle is densely packed inside, there is a problem that it influences other devices. In addition, it has been difficult to apply to diverse communication standards with frequencies in different bands.

Therefore, it is required to develop a re-radiating antenna capable of improving the communication environment without causing such a problem.

In order to solve the above problem, the present invention provides a re-radiating antenna disposed adjacent to a wireless recharging device, comprising: a re-radiating antenna capable of improving a communication environment without deteriorating the capability of the wireless recharging device; And to provide the above-mentioned objects.

According to an aspect of the present invention, A grounding portion formed on one surface of the insulating plate and connected to a ground; A slit having an open end formed by removing a part of the ground portion to expose one surface of the insulating plate; A feeder positioned between the slits and spaced apart from the ground by a predetermined distance, the feeder being formed on the insulating plate and having one end connected to a power source; And a radiating part connected to the other end of the feeding part located at an open end of the slit and formed on one surface of the insulating plate.

The radiating portion may be in the form of a tape located at an outer periphery of the insulating plate.

The radiating part may include a first radiating part extending in one direction from the feeding part and a second radiating part extending in a direction opposite to the one direction.

The length of the first radiating part and the length of the second radiating part may be different.

The first radiating part may include a first tape extending in a 'C' shape and extending leftward or rightward from the other end of the feeding part; A second tape bent in a longitudinal direction at an end of the first tape; And a third tape extending in the transverse direction from the second tape.

The third tape may be obliquely extended from the second tape at an obtuse angle.

The first radiating part may further include a fourth tape extending in the same direction as the first tape at an end of the third tape.

The second radiating part may include a fifth tape extending in an 'a' shape and extending from the other end of the feeding part in a direction opposite to the first radiating part; And a sixth tape extending in the longitudinal direction from the first tape.

And a third radiator formed on the other surface of the insulating plate.

The third radiating part may be formed on the other surface at a position corresponding to at least a part of the feeding part on the one surface of the insulating plate and at least a part of the grounding part.

The radiating part may be formed at a position spaced apart from the grounding part by a predetermined distance.

The power supply part may be formed in a meander shape in which the extending direction is bent twice or more.

And a connector including a first pin for connecting the other end of the feeding part and a power source, and a second pin for connecting the ground and the ground.

Wherein at least one of the radiation part, the feeding part and the grounding part is formed of a metal, polysilicon, ceramic, carbon fiber, conductive ink, conductive paste, ITO (Indium Tin Oxide), CNT (Carbon Nano Tube), or conductive polymer.

According to another aspect of the present invention, A power transmission coil located inside the housing and wirelessly transmitting power to an external terminal; And a re-radiating antenna positioned above the wireless charging coil for receiving an antenna signal and radiating the antenna signal again, the re-radiating antenna comprising: an insulating plate; A grounding portion formed on one surface of the insulating plate and connected to a ground; A slit having an open end formed by removing a part of the ground portion to expose one surface of the insulating plate; A feeder positioned between the slits and spaced apart from the ground by a predetermined distance, the feeder being formed on the insulating plate and having one end connected to a power source; And a radiating part connected to the other end of the feeding part located at an open end of the slit and formed on one surface of the insulating plate.

The first radiating part may include a first tape extending in a 'C' shape and extending leftward or rightward from the other end of the feeding part; A second tape bent in a longitudinal direction at an end of the first tape; And a third tape extending in the transverse direction from the second tape, wherein the second radiating part extends in an " a " shape and extends from the other end of the feeding part in a direction opposite to the first radiating part A fifth tape; And a sixth tape extending in the longitudinal direction from the first tape.

The insulating layer may further include an electromagnetic shielding pattern formed on the other surface of the insulating layer, the electromagnetic shielding pattern including a plurality of conductive tapes extending in the transverse direction and arranged in the longitudinal direction.

And a capacitor sensor formed on one side of the insulating layer.

Wherein the insulating layer is longer in the longitudinal direction than in the transverse direction and the capacitor sensor is formed on one surface of the insulating layer between the first radiation portion and the second radiation portion and includes a plurality of transversely extending And may further include a capacitor sensor including a conductive tape.

The power transmission coil may be disposed so as not to overlap with the first radiation portion and the second radiation portion.

Wherein the third tape of the first radiating part extends obliquely from the second tape at an obtuse angle and the first radiating part further comprises a fourth tape extending from the end of the third tape in the same direction as the first tape .

And a third radiating part formed on the other surface of the insulating plate at a position corresponding to at least a part of the feeding part and at least a part of the grounding part on one surface of the insulating plate.

The power supply part may be formed in a meander shape in which the extending direction is bent twice or more.

And a connector including a first pin for connecting the other end of the feeding part and a power source, and a second pin for connecting the ground and the ground.

According to at least one embodiment of the present invention, it is possible to provide a re-radiating antenna capable of receiving and transmitting a radio signal to a terminal without deteriorating the performance of the wireless charging device.

In addition, the re-radiating antenna of the present invention does not deteriorate the performance of the electromagnetic shielding sheet of the wireless charging device, and can provide a re-radiating antenna with excellent efficiency.

In addition, the re-radiating antenna of the present invention is advantageous in that it is applicable to transmission and reception of signals of various frequencies by using conductive tapes of various lengths and is versatile.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 is a view showing the concept of a re-radiating antenna according to the present invention.
2 is a view showing a state in which the wireless charging device of the present invention is mounted on a vehicle.
3 is an exploded perspective view of the wireless charging apparatus of the present invention.
4 is a view showing an embodiment of the re-radiating antenna of the present invention.
5 is a diagram showing a current distribution according to frequency of a re-radiating antenna of the present invention.
6 is a graph showing the efficiency of the re-radiating antenna of the present invention.
7 is a view showing a conventional re-radiating antenna.
8 is a view showing the efficiency of a conventional re-radiating antenna.
9 is a view showing another embodiment of the re-radiating antenna of the present invention.
10 is a graph showing the efficiency of the re-radiating antenna of FIG.
11 is a view showing another embodiment of the re-radiating antenna of the present invention.
12 is a view showing the back surface of Fig.
13 is a view showing a coating structure of the re-radiating antenna of the present invention.
Fig. 14 is a view showing the back side of the combined state of Fig. 13;
15 is a graph showing the efficiency of the re-radiating antenna of the present invention.
16 is a diagram showing a state in which the mobile terminal is placed in the wireless charging device of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

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

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Fig. 1 is a view showing the concept of the re-radiating antenna 200 of the present invention. The terminal 600 located inside the building or the vehicle 400 may be shielded by a metal transmitted from the base station 500 to the building or an appearance of the vehicle 400, . A portion where the radio wave is not partially transmitted is referred to as a shaded area, and a re-radiating antenna 200 may be provided to increase the transmission / reception ratio of the shaded area.

The external antenna 300 is provided outside the vehicle 400 and the signal received by the external antenna 300 is transmitted to the terminal 400 located inside the vehicle 400 through the re- 600 to increase the radio wave transmission / reception ratio of the terminal 600.

However, since the re-radiating antenna 200 transmits and receives signals using electromagnetic waves, the re-radiating antenna 200 receives much influence from peripheral devices. Therefore, in consideration of the relationship with other peripheral devices, the re-radiating antenna 200 should be disposed at a position where the influence of the other devices is less. However, if the distance from the terminal 600 is too large, the performance of the re-radiating antenna 200 may deteriorate. Accordingly, the distance between the re-radiating antenna 200 and the peripheral device may be minimized, The radiation antenna 200 is being studied.

Fig. 2 is a diagram showing a state in which the wireless charging device 100 of the present invention is mounted on the vehicle 400. Fig.

A charger for the terminal 600 appears in a wireless charging mode. The wireless charging method is advantageous in that charging is performed only by mounting the terminal 600 on the wireless charging device 100 without connecting the wireless charging device 100 and the terminal 600 with a cable. In addition, it is possible to reduce the inconvenience of disconnecting the charging cable every time it is used.

Particularly, when the terminal 600 is re-mounted while using the terminal 600, if the cable is completely worn and pulled out, it may interfere with the operation, and it is difficult to use the cable while being inserted in the cable. The mobile terminal 100 can be loaded and the terminal 600 can be charged.

In the vehicle 400 having the wireless charging device 100, the terminal 600 is mostly used while being mounted on the wireless charging device 100. In addition, since it is highly likely to make a hands-free call using the Bluetooth function in a stationary state during a call, the reception ratio of the antenna signal is very important when the terminal 600 is placed on the wireless charging device 100. Therefore, in order to maximize the efficiency of the re-radiating antenna 200 in the vehicle 400, the re-radiating antenna 200 is advantageous as the re-radiating antenna 200 is closer to the terminal 600, It is preferable that it is provided in itself.

However, since the re-radiating antenna 200 and the power transmitting coil 140 of the wireless recharging apparatus 100 are influenced by each other as described above, the present invention is applicable to the power transmitting coil 140 and the re- 200, and a wireless charging device 100 having the same.

3 is an exploded perspective view of the wireless charging apparatus 100 of the present invention. The wireless charging apparatus 100 includes housings 110a and 110b having a full-length internal portion and a printed circuit board 120, a shield can 125, a power transmission coil 140, and a re- 200 are shown.

The housings 110a and 110b may be formed of an upper housing 110a and a lower housing 110b. The power transmitting coil 140 and the re-radiating antenna 200 are mounted in the housing 110a and 110b. A terminal for supplying power to the re-radiating antenna 200 and a terminal for supplying an antenna signal received through the external antenna 300 located outside the vehicle 400 to the re-radiating antenna 200 may be exposed.

The upper surface of the housings 110a and 110b may be unevenly formed so that the terminal 600 may be seated on the upper surfaces of the housings 110a and 110b or a material Can be prevented from separating from the upper surfaces of the housings 110a and 110b.

The control unit receives external power from the printed circuit board 120 and supplies the external power to the power transmission coil 140 and transmits the signal received from the external antenna 300 to the re-radiating antenna 200. The upper surface of the printed circuit board 120 may further include a shield can 125 which radiates heat and provides space for mounting components thereon.

The electric power transmission coil 140 located on the printed circuit board 120 forms an electromagnetic field when a current flows and a current flows to a power receiving coil of the external terminal 600 by the electromagnetic field to charge the external terminal 600 have. In this embodiment, the power transmission coil 140 is placed on the shield can 125.

The wireless charging method is magnetic resonance method and electromagnetic induction method. The electromagnetic induction method is a method of charging an electronic device requiring charging by using the induction current principle. The electric current flowing in the electric power transmission coil 140 mounted on the portable charging device forms an electromagnetic field, and the electric power receiving coil located in the electromagnetic field Electric current can flow through the electromagnetic field.

In the magnetic resonance method, a strong magnetic field coupling phenomenon is formed between the power transmission coil 140 and the power reception coil 13 having the same resonance frequency by charging using a resonance method, which is a phenomenon of vibrating at a specific amplitude at a specific frequency .

The electromagnetic induction method has high efficiency, but the power transmission coil 140 and the power receiving coil must be positioned adjacent to each other. If the electromagnetic induction system is arranged at a distance or at an angle, the efficiency is greatly reduced. Therefore, in the electromagnetic induction type charging, the arrangement between the power transmitting coil 140 and the power receiving coil is very important.

On the other hand, the magnetic resonance method does not have a higher efficiency than the electromagnetic induction method. However, since the magnetic resonance method can be charged even at a distance, there is an advantage that it is not restricted in use. Also, the unused energy part has the advantage of being reabsorbed into the electromagnetic field.

The power transmission coil 140 may further include a ferrite sheet 130 on an upper surface or a lower surface thereof. The ferrite sheet 130 can improve the circuit flow of the flux line of the coil and reduce the amount of electromagnetic radiation emitted from the power transmitting coil 140. [

3, when the re-radiating antenna 200 is positioned on the upper surface of the power transmission coil 140, the re-radiating antenna 200 is made of a conductive material, and the power transmitted from the power transmission coil 140 is Failure to pass through the re-radiating antenna 200 degrades the performance of the wireless charging device 100.

It is difficult for power to be transmitted through the re-radiating antenna 200 and through the power transmitting coil 140. Therefore, the power transmission efficiency may be lowered to the terminal 600 that is seated on the upper surfaces of the housings 110a and 110b. On the contrary, if the re-radiating antenna 200 is placed under the power transmission coil 140, there is a problem that noise emitted from the antenna is mixed by the power transmission coil 140 and communication quality is lowered.

In order to solve the above problem, the present invention is characterized in that the re-radiating antenna 200 is disposed on the top surface of the power transmission coil 140, and is provided with a re-radiating antenna (not shown) which does not disturb the power transmitted from the power transmitting coil 140 to the terminal 600 And an antenna 200 are provided.

Hereinafter, the re-radiating antenna 200 of the present invention will be described. 4 is a view showing an embodiment of the re-radiating antenna 200 of the present invention. The re-radiating antenna 200 of the present invention includes a feeding part 240 and a radiating part 220 and 230 formed between the slits 255 formed in the insulating plate 210, the grounding part 250 and the grounding part 250 do.

The insulating plate 210 is a plate-like member made of a nonconductive material, and may be made of epoxy, glass fiber, or the like, such as FR-4. The radiation parts 220 and 230, the ground part 250, and the feeding part 240 are formed on the insulating plate 210.

The grounding part 250 is formed by applying a conductive material to one surface of the insulating plate 210 and is connected to a ground to be grounded to block the noise of the re-radiating antenna 200. In addition, a signal of a desired frequency can be transmitted / received by using only a quarter of the length of the radiation parts 220 and 230 due to the mirror effect. That is, in order to reduce the length of the radiation parts 220 and 230 and reduce the noise, the grounding part 250 is provided on one surface of the heat-

The grounding unit 250 may be located at one end of the insulating plate 210 as shown in FIG. It is advantageous that the grounding portion 250 is positioned at one side rather than the grounding portion 250 at the center when the grounding portion 250 is connected to the connector 260 for connecting the grounding portion and the length of the radiation portions 220 and 230 is sufficient The grounding unit 250 is disposed on one side in order to secure the grounding unit.

In order for the power transmitted by the power transmission coil 140 of the present invention to be transmitted to the mobile terminal 600 located on the upper surface of the housing 110, an obstacle is required between the power transmission coil 140 and the mobile terminal 600 It should be absent. That is, as shown in FIG. 4, the grounding part 250 may be located at one side of the insulating plate 210 in order to leave the central part of the insulating plate 210 without being disposed with a conductive material.

The power feeding part 240 is connected to a power source and applies current to the radiation parts 220 and 230. That is, one end of the power feeding unit 240 is connected to the power source and the other end is connected to the radiation units 220 and 230 to transmit and receive signals by applying current to the radiation units 220 and 230.

The feeding part 240 extends between the slits 255 formed in the grounding part 250, and the slit is formed by removing a part of the grounding part 250. One end of the slit 255 is open and the other end is closed. The power feeder 240 extending between the slits 255 functions as a radiator that emits a signal and therefore is spaced apart from the ground 250 by a predetermined distance, The transmission / reception ratio of the base station can be changed.

The radiating units 220 and 230 receive the current corresponding to the antenna signal from the power feeding unit 240 and emit the received antenna signal. The radiation parts 220 and 230 are monopole antennas that are formed of a conductor made of a conductive material and receive a signal from one side.

The radiation parts 220 and 230 are located at the outer circumferential portion of the insulating plate 210 as shown in FIG. The length of the radiation parts 220 and 230 depends on the wavelength of a signal to be transmitted / received.

The radiation parts 220 and 230 extend from the other end of the feeding part 240 and include one radiation part 220 and 230 extending in the first direction and a second radiation part 230 extending in the other direction . In the drawing, the first radiation part 220 extends to the left, the second radiation part 230 extends to the right, and the left and right directions can be changed.

The first radiating part 220 extending to the left side includes a first tape 221 extending in the transverse direction, a second tape 222 bent in the longitudinal direction from the first tape 221, 222, and a third tape 223 extending in the transverse direction. The third tape 223 has a "C" shape.

The second radiation part 230 extending to the right extends in a 'B' shape and a fifth tape 231 extending from the other end of the feeding part 240 in the direction opposite to the first radiation part 220 And a sixth tape 232 bent in the longitudinal direction from the fifth tape 231.

The lengths of the first and second radiation units 220 and 230 are different from each other, and the resonance frequency varies depending on the length of the first radiation unit 220 and the second radiation unit 230. Various antennas are mounted on the mobile terminal 600. Antennas for short-range wireless communication such as Wi-Fi (WIFI) and Bluetooth (BlueTooth), and DMB antennas for receiving broadcast signals from satellites when watching DMB.

Each antenna uses signals of different frequency bands, and the positions of the antennas are arranged at the upper and lower ends or the corners to minimize the mutual influence. Resonance with an antenna for communication is important in order to increase the efficiency of transmission and reception of signals for a call, which is a main function of the mobile terminal 600.

Recently, communication standards such as GSM (Global System for Mobile Communication), UMTS (Universal Mobile Telecommunications System) and LTE (Long Term Evolution) are typical.

GSM is also referred to as an international mobile phone and has been transferred to the European Telecommunications Standards Institute (ETSI) in 1989 based on the establishment of a digital cellular system in the GSM (Global System for Mobile communication) under the European Telecommunications Administrations Conference (CEPT) It was established as a European standard.

UMTS is a 3GPP (3 Generation Partnership Project) communication standard driven by European companies such as Finland, Nokia, Sweden Ericsson and Siemens in Germany. It is a personal communication service using asynchronous technology based on GSM.

LTE has evolved from WCDMA (Wideband Code Division Multiple Access) in the sense that it is a technology that has evolved 3G mobile communication over the long term.

In case of applying only in a specific country, it is preferable to be applicable to the communication standard according to each country. GSM uses frequencies of 850, 900, 1800, and 1900 MHz, and UMTS uses frequencies of 850, 900, and 2100 MHz. In addition, LTE uses frequencies of 850 MHz, 900 MHz, 1800 MHz, 2100 MHz and 2600 MHz.

5 is a diagram showing current distributions of the radiation parts 220 and 230 and the feed part 240 of the re-radiating antenna 200 according to the present invention. At 900 MHz, a large amount of current flows through the second radiation part 230 having a short length, and a 900 MHz signal can be transmitted / received through the second radiation part 230. At 1800 MHz, 2100 MHz, and 2700 MHz, the current flows more in the first radiation unit 220 as the frequency increases, and the first radiation unit 220 transmits and receives signals in the higher frequency range.

6 is a graph showing the efficiency of the re-radiating antenna 200, wherein the horizontal axis represents the frequency and the vertical axis represents the S-parameter (reflection coefficient). The ratio of the intensity of the incident signal to the intensity of the reflected signal is represented by a decibel region. Since the intensity of the signal reflected and output is small, the reflection coefficient has a negative value. The smaller the reflection coefficient is, Is high.

 At 900 MHz, 1800 MHz, 2100 MHz and 2700 MHz, the s-parameter graph shows a peak in the lower direction. At this frequency, the re-radiating antenna 200 is resonated at the above frequency, so that the efficiency is high.

FIG. 7 is a graph showing the efficiency of a conventional re-radiating antenna 20 and a conventional re-radiating antenna 20. FIG. Unlike the tape-shaped radiation part of the present invention, the conventional radiation part 22 is located at the center of the insulation layer 21 in a plate shape.

In the case where the radiation part 22 having a plate-like structure is used as described above, resonance does not occur in various frequency bands, and a portion where the reflection coefficient greatly protrudes in the downward direction is small as shown in FIG. The values in the frequency bands (900 MHz, 1800 MHz, 2100 MHz, and 2700 MHz) used in the third generation communication are smaller than those of the re-radiating antenna 200 of the present invention.

7, since the re-radiating antenna 200 is located on the upper surface of the power transmission coil, the wireless recharting device 100 of the wireless recharging device 100 of the present invention can transmit the re- There is a problem that the amount of power transmitted to the power source 600 is reduced and the efficiency is lowered.

In other words, the present invention is applicable to various frequency bands as compared with the conventional re-radiating antenna 200, and it is possible to minimize mutual efficiency deterioration even when the power transmitting coil 140 is disposed.

9 is a view showing another embodiment of the re-radiating antenna 200 of the present invention. the re-radiating antenna 200 shown in FIG. 4A has a meander shape in which the shape of the feed part 240 is bent a plurality of times and the re-radiating antenna 200 ' (240 ') is a straight line. FIG. 10 is a graph showing the efficiency of the re-radiating antenna 200 of FIG. 9, in which the bold line shows the efficiency when the meander-shaped feeder 240 is applied, Respectively.

The meander-shaped power feeder 240 substantially extends the length of the radiation portions 220 and 230, so that the peak point toward the lower side of the graph of the s-parameter appears more frequently. This is because the transmission and reception efficiency Is high.

11 is a view showing another embodiment of the re-radiating antenna 200 of the present invention. 12 is a view showing the back surface of Fig. The radiation parts 220 and 230 of the re-radiating antenna 200 can be modified to increase the efficiency in the higher frequency band than the re-radiating antenna 200 described above.

11, the first radiation unit 220 may further include a fourth tape 224 that is laterally bent from the third tape 223, and the length of the first radiation unit 220 may be shorter than the length As a result, the transmission / reception efficiency of the signal is improved at 2600 MHz.

One end of the power feeder 240 is connected to a power source, and the grounding unit 250 uses a connector 260 to connect to the ground. The connector 260 is connected to the feeding part 240 and the grounding part 250 through the fin and the power supply and the ground connection terminal are inserted into the connector 260 to connect the feeding part 240 and the grounding part 250 . A hole 251 is formed in the end portion of the feeding part 240 and the grounding part 250 adjacent to the feeding part 240 so that the feeding part 240 and the grounding part 250 are connected using the connector 260 and the pin And the pin of the connector 260 is inserted into the hole 251.

One side of the insulating plate 210 and the center of the other side are empty without forming the radiation parts 220 and 230. A capacitive sensor 270 may be provided in the empty space. The capacitance proximity sensor 170 is a sensor that reacts when an object having a dielectric constant of greater than 1.2 exists. The material inside the sensor acts as a capacitor, and when the total capacitance component of the sensor probe rises, it becomes a start signal of the internal oscillator, (140).

The electric power is always wasted when the electric current flows in the electric power transmission coil 140. Therefore, when the user desires to put the terminal 600 on the upper surface of the wireless charging device 100, the electrostatic capacity proximity sensor 170 senses the electric power transmission A current flows through the coil 140. [

Fig. 12 is a view showing the back surface of Fig. 11, and an electromagnetic shielding pattern 280 may be formed on the back surface. Devices using electromagnetic fields are restricted by EMI (Electro Magnetic Interference) regulations to release electromagnetic waves of a certain size or more.

The EMI shielding pattern 280 is formed of a conductive material for reducing an electromagnetic field flowing out to the outside in order to prevent an apparatus using an electromagnetic field from affecting an external apparatus according to the regulation of the EMI, And is formed in a predetermined pattern shape to enhance the shielding efficiency.

The electromagnetic shielding pattern 280 includes a conductive material. The electromagnetic shielding pattern 280 minimizes the reduction of the electromagnetic field that directly affects the charging of the electromagnetic field formed by the power transmitting coil 140 and minimizes the influence on the re-radiating antenna 200 Shaped pattern extending in a direction (transverse direction) perpendicular to the extending direction of the radiation parts 220 and 230 as shown in Fig.

The radiation parts 220 and 230 of the re-radiating antenna of the present invention extend in the lateral direction, but most of the radiation parts 220 and 230 extend in the longitudinal direction (second and fifth tapes). Therefore, in order to minimize the influence on the re-radiating antenna 200, the electromagnetic shielding pattern 280 may be formed of a plurality of tapes extending in the transverse direction. A separate electromagnetic shielding sheet can be omitted by directly forming the master shielding pattern on the insulating plate 210. [

Further, the radiation parts 220 and 230 can be further formed on the back surface. The grounding unit 250 and the feeder 240 are disposed on the backside of the portion where the grounding unit 250 and the feeder unit 240 are formed and are not in direct contact with the grounding unit 250 and the feeder unit 240 by the insulating plate 210, And can function as a radiation part.

As shown in FIG. 12, when the third radiating part 225 and the fourth radiating part 235 are further formed on the rear surface of the insulating plate 210, signal transmission / reception rates in the 1800 MHz, 2100 MHz, and 2600 MHz bands are increased.

FIG. 13 is a view showing a coating structure of the re-radiating antenna 200 of the present invention. The radiating parts 220 and 230 of the antenna, the grounding part 250, and the feeding part 240 are formed on the insulating plate 210, And a coating layer 290 may be further formed on the surface to protect the printed conductive material.

 FIG. 14 is a rear view of the coupled state of FIG. 13, in which a connector 260 is connected to an external power source or the ground unit 250 after forming a coating layer. And may further include additional connection terminals for measuring the state of the antenna, measuring the temperature of the wireless charger, and the like.

 The dotted line in FIG. 14 corresponds to the power transmission coil 140, and the insulation part, the feed part 240, and the radiation parts 220 and 230 are formed so as not to overlap the power transmission coil 140.

15 is a graph showing the efficiency of the re-radiating antenna 200 of the present invention. The horizontal axis represents the wavelength and the vertical axis represents the reflection coefficient. The smaller the reflection coefficient value, the better the radiation / reception performance of the radio wave. The values are small in 800 MHz, 900 MHz, 1500 MHz, 1800 MHz, 2100 MHz, and 2600 MHz, which are mainly used for wireless communication.

For a more detailed description, reference is made to Table 1. Table 1 shows the applied power vs. reflected power by frequency.

Band
Level (Max)
[dBm] Reference Position Signal Level [dBm] Loss [dBm GSM 850 33 23.3 9.7 GSM 900 33 23.1 9.9 GSM 1800 30 17.6 12.4 GSM 1900 30 16.8 13.2 UMTS 850 (BAND 5) 24 14.2 9.8 UMTS 900 (BAND 8) 24 14.4 9.6 UMTS 2100 (BAND 1) 24 10.9 13.1 LTE 700 (BAND 17) 23 15.1 7.9 LTE 800 (BAND 20) 23 15.0 8.0 LTE 900 (BAND 8) 23 14.1 8.9 LTE 1800 (BAND 3) 23 11.6 11.4 LTE 2100 (BAND 1) 23 10.0 13.0 LTE 2600 (BAND 7) 23 9.2 13.8

The greater the magnitude of the reflected signal is, the better the magnitude of the lost signal is, and the size of the lost signal should be less than 15dBm so that it can be used as the re-radiating antenna 200. As shown in Table 1, Or less.

16 is a diagram showing a state in which the mobile terminal 600 is mounted on the wireless charging device 100 of the present invention. The lower portion of the mobile terminal 600 may be positioned on the side where the grounding portion 250 of the re-radiating antenna 200 is located, as shown in (a) the lower portion of the mobile terminal 600 may be located on the opposite side of the grounding portion 250 of the re-radiating antenna 200 as shown in FIG.

Generally, since the main antenna of the mobile terminal 600 is located at the lower end of the mobile terminal 600, the efficiency may be changed according to the direction of the mobile terminal 600. It is necessary for the performance to be checked not only in the forward direction (a) but also in the reverse direction (b), since it is required that the efficiency should exceed the predetermined standard regardless of which direction the user places in the direction. Table 2 shows the magnitude of the applied signal, the reflected signal, and the lost signal in the reverse direction.

Band
Level (Max)
[dBm] Reverse Direction Signal Level [dBm] Loss [dBm] GSM 850 33 20.7 12.3 GSM 900 33 19.3 13.7 GSM 1800 30 16.1 13.9 GSM 1900 30 16.3 13.7 UMTS 850 (BAND 5) 24 11.1 12.9 UMTS 900 (BAND 8) 24 10.9 13.1 UMTS 2100 (BAND 1) 24 11.1 12.9 LTE 700 (BAND 17) 23 12.8 10.2 LTE 800 (BAND 20) 23 12.2 10.8 LTE 900 (BAND 8) 23 11.1 11.9 LTE 1800 (BAND 3) 23 10.4 12.6 LTE 2100 (BAND 1) 23 10.0 13.0 LTE 2600 (BAND 7) 23 9.0 14.0

In the reverse direction, the intensity of the lost signal in the forward direction is larger, but the strength of the lost signal is 15 dBm or less, so that it can function as the re-emission antenna 200.

According to at least one embodiment of the present invention, it is possible to provide a re-radiating antenna 200 that can receive a radio signal and transmit it to the terminal 600 without degrading the performance of the wireless charging device 100.

In addition, the re-radiating antenna 200 of the present invention is not degraded in performance by the electromagnetic shielding sheet of the wireless charging device 100, and thus it is possible to provide the re-radiating antenna 200 of excellent efficiency.

The foregoing detailed description should not be construed in all aspects as limiting and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

100: wireless charging device 110: housing
120: printed circuit board; 125: Shield cans
130: ferrite sheet 140: power transmission coil
200: re-radiating antenna 210: insulating plate
220, 225, 230, 235: radiation part 240: feeding part
250: ground portion 255: slit
260: connector 270: capacitive proximity sensor
280: Electromagnetic field shielding pattern 290: Coating film
300: external antenna 400: vehicle
600: terminal

Claims (24)

Insulating plate;
A grounding portion formed on one surface of the insulating plate and connected to a ground;
A slit having an open end formed by removing a part of the ground portion to expose one surface of the insulating plate;
A feeder positioned between the slits and spaced apart from the ground by a predetermined distance, the feeder being formed on the insulating plate and having one end connected to a power source;
A radiation part connected to the other end of the feeding part located at an open end of the slit and formed on one surface of the insulating plate; And
And a connector including a first pin connecting the other end of the feed part and a power source, and a second pin connecting the ground and the ground. The method according to claim 1,
Wherein the radiating portion is in the form of a tape located at an outer periphery of the insulating plate. The method according to claim 1,
The radiating portion
A first radiation part extending in one direction from the feeding part,
And a second radiating part extending in a direction opposite to the one direction. The method of claim 3,
Wherein the length of the first radiating part is different from that of the second radiating part. The method of claim 3,
The first radiating part extends in a " C " shape,
A first tape extending from the other end of the feeding part to the left or right side;
A second tape bent in a longitudinal direction at an end of the first tape; And
And a third tape extending in the transverse direction from the second tape. 6. The method of claim 5,
The third tape
And extends obliquely from the second tape at an obtuse angle. The method according to claim 6,
The first radiating part
Further comprising a fourth tape extending in the same direction as the first tape at an end of the third tape. 6. The method of claim 5,
The second radiating part extends in an " a " shape,
A fifth tape extending from the other end of the feeding part in a direction opposite to the first radiation part;
And a sixth tape extending in the longitudinal direction from the first tape. The method of claim 3,
And a third radiating part formed on the other surface of the insulating plate. 10. The method of claim 9,
The third radiating part
Wherein the antenna is formed on the other surface at a position corresponding to at least a part of the feeding part on the one surface of the insulating plate and at least a part of the grounding part. The method according to claim 1,
And the radiating part is formed at a position spaced apart from the grounding part by a predetermined distance. The method according to claim 1,
Wherein the power feeding section is a meander in which the extending direction is bent twice or more. delete The method according to claim 1,
At least one of the radiation part, the feeding part and the grounding part
Conductive polymer, metal, polysilicon, ceramic, carbon fiber, conductive ink, conductive paste, indium tin oxide (ITO), carbon nanotube (CNT) Wherein the antenna comprises at least one of a first antenna and a second antenna. housing;
A power transmission coil located inside the housing and wirelessly transmitting power to an external terminal;
And a re-radiating antenna positioned above the power transmission coil for receiving an antenna signal and radiating the antenna signal again,
Wherein the re-
Insulating plate;
A grounding portion formed on one surface of the insulating plate and connected to a ground;
A slit having an open end formed by removing a part of the ground portion to expose one surface of the insulating plate;
A feeder positioned between the slits and spaced apart from the ground by a predetermined distance, the feeder being formed on the insulating plate and having one end connected to a power source; And
And a radiating part connected to the other end of the feeding part located at an open end of the slit and formed on one surface of the insulating plate. 16. The method of claim 15,
The first radiating part extends in a " C " shape,
A first tape extending from the other end of the feeding part to the left or right side;
A second tape bent in a longitudinal direction at an end of the first tape; And
And a third tape extending in the transverse direction from the second tape,
The second radiating part extends in an " a " shape,
A fifth tape extending from the other end of the feeding part in a direction opposite to the first radiation part;
And a sixth tape extending in the longitudinal direction from the first tape. 17. The method of claim 16,
Wherein the insulating plate has a longitudinal direction longer than a lateral direction,
And an electromagnetic shielding pattern formed on the other surface of the insulating plate, the electromagnetic shielding pattern including a plurality of conductive tapes extending in a transverse direction and arranged in a longitudinal direction. 17. The method of claim 16,
And a capacitor sensor formed on one surface of the insulating plate. 19. The method of claim 18,
The insulating layer is longer in the longitudinal direction than in the lateral direction,
The capacitor sensor
And a capacitor sensor formed on one surface of the insulating layer and including a plurality of conductive tapes formed between the first radiation portion and the second radiation portion and extending in the transverse direction and arranged in the longitudinal direction. 16. The method of claim 15,
Wherein the power transmission coil is disposed so as not to overlap with the first radiation portion and the second radiation portion. 17. The method of claim 16,
Wherein the third tape of the first radiating portion extends obliquely from the second tape at an obtuse angle,
Wherein the first radiating portion further comprises a fourth tape extending in the same direction as the first tape at the end of the third tape. 17. The method of claim 16,
Further comprising a third radiating part formed on the other surface of the insulating plate at a position corresponding to at least a part of the feeding part and at least a part of the grounding part on one surface of the insulating plate. 16. The method of claim 15,
Wherein the power feeding portion is a meander shape in which the extending direction is bent twice or more. 16. The method of claim 15,
Further comprising: a connector including a first pin connecting the other end of the feeding part and a power source, and a second pin connecting the ground and the ground.

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