KR102511755B1 - Near field communication antenna and near field communication device having the same - Google Patents

Abstract

A near field communication (NFC) antenna includes a first antenna terminal, a second antenna terminal, and a loop coil. The first antenna terminal and the second antenna terminal are formed on the first surface of the substrate. The loop coil is formed on the first surface of the substrate, is directly connected between the first antenna terminal and the second antenna terminal, and includes a plurality of turns. A first antenna terminal is located inside each of a plurality of turns of a loop coil, a second antenna terminal is located outside each of a plurality of turns of a loop coil, and a virtual signal passing through the first antenna terminal and the second antenna terminal is located. A straight line is parallel to one of the edges of the substrate, and each of the plurality of turns of the loop coil does not overlap each other.

Description

Short-range wireless communication antenna and short-range wireless communication device including the same {NEAR FIELD COMMUNICATION ANTENNA AND NEAR FIELD COMMUNICATION DEVICE HAVING THE SAME}

The present invention relates to wireless communication technology, and more particularly, to an antenna for near field communication (NFC) and an NFC device including the same.

Recently, with the development of Near Field Communication (NFC) technology, which is a kind of wireless communication technology, NFC devices are widely applied to mobile devices and the like.

Mobile devices can conveniently send and receive data to each other using NFC devices. Also, the NFC device may be used as a mobile payment method.

Such an NFC device generally includes an NFC antenna for radiating electromagnetic waves, and manufacturing cost and performance of the NFC device are determined according to the design of the NFC antenna.

Therefore, when the manufacturing cost of the NFC antenna increases, there is a problem in that the manufacturing cost of the NFC device and the mobile device including the same also increases.

One object of the present invention to solve the above problems is to provide a near field communication (NFC) antenna capable of reducing manufacturing cost while maintaining high performance.

Another object of the present invention is to provide an NFC device including the NFC antenna.

Another object of the present invention is to provide a mobile device including the NFC device.

In order to achieve one object of the present invention described above, a near field communication (NFC) antenna according to an embodiment of the present invention includes a first antenna terminal, a second antenna terminal, and a loop coil. The first antenna terminal and the second antenna terminal are formed on a first surface of a substrate. The loop coil is formed on the first surface of the substrate, is directly connected between the first antenna terminal and the second antenna terminal, and includes a plurality of turns. The first antenna terminal is located inside each of the plurality of turns of the loop coil, the second antenna terminal is located outside each of the plurality of turns of the loop coil, and the first antenna terminal and the second antenna are located outside each of the plurality of turns of the loop coil. An imaginary straight line passing through the terminal is parallel to one of the edges of the board, and each of the plurality of turns of the loop coil does not overlap each other.

In one embodiment, the plurality of turns of the loop coil may pass between the first antenna terminal and the second antenna terminal.

In one embodiment, the distance between the first antenna terminal and the second antenna terminal may be 2 mm or more and 20 mm or less.

In one embodiment, each of the plurality of turns of the loop coil may have a rectangular shape.

In one embodiment, each of the plurality of turns of the loop coil may have a circular shape.

In one embodiment, the substrate may correspond to a flexible printed circuit board (FPCB).

In one embodiment, the board is mounted on a battery pack of a mobile device, and a distance between the first antenna terminal and the second antenna terminal may be 10 mm or less.

In one embodiment, the board is mounted on a rear cover of a mobile device, and a distance between the first antenna terminal and the second antenna terminal may be 20 mm or less.

In one embodiment, the NFC antenna is formed on the first surface of the substrate, is physically separated from the loop coil, the first antenna terminal, and the second antenna terminal, and includes a plurality of turns. A coil may be further included.

The resonant coil may be located inside an innermost turn among the plurality of turns of the loop coil.

A distance between an innermost turn among the plurality of turns of the loop coil and an outermost turn among the plurality of turns of the resonance coil may be less than 2 mm.

A self-resonance frequency (SFR) of the resonant coil may correspond to 13.56 MHz.

Each of the plurality of turns of the resonance coil may have a rectangular shape.

Each of the plurality of turns of the resonance coil may have a circular shape.

In one embodiment, the NFC antenna is formed on the first surface of the substrate, is physically separated from the loop coil, the first antenna terminal, and the second antenna terminal, and has a resonance including one turn. A coil and a resonance capacitor connected between both ends of the resonance coil may be further included.

The resonance coil and the resonance capacitor may be located inside an innermost turn among the plurality of turns of the loop coil.

A distance between an innermost turn among the plurality of turns of the loop coil and the resonant coil may be less than 2 mm.

A resonant frequency formed by the resonant coil and the resonant capacitor may correspond to 13.56 MHz.

In order to achieve one object of the present invention described above, an NFC device according to an embodiment of the present invention includes an NFC chip, an NFC antenna, and a matching circuit. The NFC chip generates a transmission signal and outputs it through a first transmission terminal and a second transmission terminal. The NFC antenna is formed on a first surface of a substrate and includes a first antenna terminal, a second antenna terminal, and a loop coil directly connected between the first and second antenna terminals, based on the transmission signal. emits electromagnetic waves The matching circuit is connected between the first transmission terminal, the second transmission terminal, the first antenna terminal, and the second antenna terminal, and performs impedance matching between the NFC chip and the NFC antenna. The loop coil includes a plurality of turns, the first antenna terminal is located inside each of the plurality of turns of the loop coil, and the second antenna terminal is located inside each of the plurality of turns of the loop coil. Located outside, an imaginary straight line passing through the first antenna terminal and the second antenna terminal is parallel to one of the edges of the substrate, and each of the plurality of turns of the loop coil does not overlap each other. .

In order to achieve one object of the present invention described above, a mobile system according to an embodiment of the present invention includes an NFC device, a memory device, and an application processor. The NFC device communicates with an external device through NFC. The memory device stores output data. The application processor controls operations of the NFC device and the memory device. The NFC device generates a transmission signal corresponding to the output data and outputs the transmitted signal through a first transmission terminal and a second transmission terminal, which is formed on a first surface of a board, a first antenna terminal, and a second antenna terminal. , and a loop coil directly connected between the first and second antenna terminals, and an NFC antenna for radiating electromagnetic waves based on the transmission signal, and the first transmission terminal, the second transmission terminal, and the first transmission terminal. A matching circuit connected between a first antenna terminal and the second antenna terminal and performing impedance matching between the NFC chip and the NFC antenna. The loop coil includes a plurality of turns, the first antenna terminal is located inside each of the plurality of turns of the loop coil, and the second antenna terminal is located inside each of the plurality of turns of the loop coil. Located outside, an imaginary straight line passing through the first antenna terminal and the second antenna terminal is parallel to one of the edges of the substrate, and each of the plurality of turns of the loop coil does not overlap each other. .

A near field communication (NFC) antenna according to embodiments of the present invention can reduce manufacturing cost while maintaining high performance, improve production yield, and can be implemented with a thin thickness.

1 is a diagram illustrating a mobile device according to an embodiment of the present invention.
2 is a block diagram illustrating a near field communication (NFC) device according to an embodiment of the present invention.
3 and 4 are diagrams illustrating examples of NFC antennas included in the NFC device of FIG. 2 .
5 is a diagram illustrating an example of an NFC antenna including a magnetic sheet.
6 is a block diagram illustrating an example of the NFC device shown in FIG. 2 .
7 is a block diagram illustrating an example of a transmission circuit included in the NFC chip of FIG. 6 .
8 is a block diagram illustrating another example of the NFC device shown in FIG. 2 .
9 is a block diagram illustrating another example of the NFC device shown in FIG. 2 .
10 is a diagram illustrating another example of an NFC antenna included in the NFC device of FIG. 2 .
11 is a block diagram illustrating an example of the NFC device shown in FIG. 2 .
12 is a diagram illustrating another example of an NFC antenna included in the NFC device of FIG. 2 .
13 is a block diagram illustrating an example of the NFC device shown in FIG. 2 .
14 and 15 are diagrams illustrating examples in which an NFC antenna included in the NFC device of FIG. 2 is mounted on a mobile device.
16 is a block diagram illustrating a mobile system according to an embodiment of the present invention.

For the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of explaining the embodiments of the present invention, and the embodiments of the present invention may be implemented in various forms and the text It should not be construed as being limited to the embodiments described above.

Since the present invention can have various changes and various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

It is 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, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle. Other expressions describing the relationship between elements, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", etc., should be interpreted similarly.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "comprise" or "having" are intended to indicate that the described feature, number, step, operation, component, part, or combination thereof exists, but that one or more other features or numbers are present. However, it should be understood that it does not preclude the presence or addition of steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, they are not interpreted in an ideal or excessively formal meaning. .

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. The same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components are omitted.

1 is a diagram illustrating a mobile device according to an embodiment of the present invention.

Referring to FIG. 1 , a mobile device 10 according to embodiments of the present invention includes a Near Field Communication (NFC) device 20. The NFC device 20 built into the mobile device 10 performs NFC communication with an external NFC device (eg, an NFC reader or an NFC card) 30 .

For example, the NFC device 20 embedded in the mobile device 10 may alternately and repeatedly perform an operation of detecting whether an NFC card exists nearby and an operation of detecting whether an NFC reader exists around it. can The NFC device 20 may operate in a card mode when detecting an NFC reader, and operate in a reader mode when detecting an NFC card. The NFC device 20 transmits and receives data with the NFC reader based on electromagnetic waves (EMW) provided from the NFC reader in the card mode operating as a card, and operates as a reader In the reader mode, data may be transmitted/received with the NFC card based on electromagnetic waves (EMW) emitted by the NFC device 20.

On the other hand, the mobile device 10 according to embodiments of the present invention, for example, a cellular phone, a smart phone, a tablet PC, a laptop computer, a personal information terminal ( Personal digital assistant (PDA), portable multimedia player (PMP), digital camera, music player, portable game console, navigation system, etc. It may be a mobile device. In addition, the mobile device 10 according to embodiments of the present invention, for example, a smart watch, a wrist band electronic device, a necklace type electronic device, and a glasses type electronic device ) may be any wearable electronic device, such as an electronic device.

2 is a block diagram illustrating a near field communication (NFC) device according to an embodiment of the present invention.

The NFC device 20 shown in FIG. 2 may be the NFC device 20 embedded in the mobile device 10 of FIG. 1 .

Referring to FIG. 2 , the NFC device 20 includes an NFC antenna 100 , a matching circuit 200 , and an NFC chip 300 .

The NFC antenna 100 may be connected to the matching circuit 200 through the first antenna terminal AED1 and the second antenna terminal AED2. The NFC antenna 100 may include a loop coil directly connected between the first antenna terminal AED1 and the second antenna terminal AED2 and having a plurality of turns.

In general, an NFC antenna is formed on a substrate, and a conventional NFC antenna is formed over both sides of the substrate. That is, in the case of a conventional NFC antenna, a first end of a loop coil having a plurality of turns is connected to a first antenna terminal on a first surface of the substrate, and a second end of the loop coil is connected through a via. It is connected to a second antenna terminal on the second side of the substrate.

In contrast, as will be described later with reference to FIGS. 3 and 4 , the NFC antenna 100 according to embodiments of the present invention may be formed on an end surface of a substrate. That is, the first antenna terminal (AED1), the second antenna terminal (AED2), and the loop coil included in the NFC antenna 100 are formed on the first surface of the substrate, and both ends of the loop coil are formed on the first surface of the substrate. It may be directly connected to the first antenna terminal AED1 and the second antenna terminal AED2 on the first surface.

The matching circuit 200 may be connected between the NFC antenna 100 and the NFC chip 300 . The matching circuit 200 may perform impedance matching between the NFC antenna 100 and the NFC chip 300 . The matching circuit 200 may include a capacitor constituting a resonant circuit together with the NFC antenna 100 . Based on the capacitance of the capacitor included in the matching circuit 200, the resonance frequency of the NFC device 20 may be adjusted to a desired frequency (eg, 13.56 MHz).

In the reader mode, the NFC chip 300 may generate a transmission signal and provide the transmission signal to the NFC antenna 100 through the matching circuit 200 . The NFC antenna 100 may transmit and receive data with an external NFC card by radiating electromagnetic waves (EMW) based on the transmission signal. Since the external NFC card includes a resonant circuit composed of an antenna having an inductance component and a resonant capacitor, when the NFC antenna 100 radiates electromagnetic waves (EMW), the external Mutual induction may occur between the NFC card and the NFC antenna 100 . Therefore, the external NFC card can receive the transmission signal by demodulating the signal generated by the mutual induction.

In the card mode, since mutual induction occurs between the NFC antenna 100 and the external NFC reader in response to electromagnetic waves (EMW) received from the external NFC reader, the NFC antenna 100 is controlled by the mutual induction. Antenna voltages generated at the first antenna terminal AED1 and the second antenna terminal AED2 may be provided to the NFC chip 300 through the matching circuit 200 . The NFC chip 200 may receive data transmitted from the external NFC reader by demodulating the antenna voltage.

3 and 4 are diagrams illustrating examples of NFC antennas included in the NFC device of FIG. 2 .

Referring to FIGS. 3 and 4 , the NFC antenna 100a may be formed on the substrate 110 .

The NFC antenna 100a may include a first antenna terminal AED1, a second antenna terminal AED2, and a loop coil 120 formed on the first surface (eg, upper surface) of the substrate 110. can The first antenna terminal AED1 and the second antenna terminal AED2 may be spaced apart from each other. Also, as shown in FIGS. 3 and 4 , an imaginary straight line IL passing through the first antenna terminal AED1 and the second antenna terminal AED2 may be parallel to one of the corners of the board 110 . there is.

The loop coil 120 includes a plurality of turns and may be directly connected between the first antenna terminal AED1 and the second antenna terminal AED2 on the first surface of the substrate 110 . Each of the plurality of turns of the loop coil 120 may not overlap each other. In one embodiment, the loop coil 280 may be formed of any metal material having high conductivity, such as copper, silver, or aluminum.

3, the loop coil 120 is shown as including two turns, and in FIG. 4, the loop coil 120 is shown as including five turns. However, the present invention is not limited thereto, and the loop coil 120 may include an arbitrary number of turns of two or more.

3 and 4, the first antenna terminal AED1 is located inside each of the plurality of turns of the loop coil 120, and the second antenna terminal AED2 is the plurality of turns of the loop coil 120. may be located outside each of the turns of

That is, the plurality of turns of the loop coil 120 may be formed to pass between the first antenna terminal AED1 and the second antenna terminal AED2. Therefore, the first end of the loop coil 120 is directly connected to the first antenna terminal AED1 inside the plurality of turns, and the second end of the loop coil 120 is directly connected to the second antenna outside the plurality of turns. It can be directly connected to the terminal (AED2).

In one embodiment, the substrate 110 may correspond to a printed circuit board (PCB).

In another embodiment, the substrate 110 may correspond to a flexible printed circuit board (FPCB).

In one embodiment, as shown in FIG. 5, the NFC antenna 100a includes a substrate 110 on which a first antenna terminal AED1, a second antenna terminal AED2, and a loop coil 120 are formed. A magnetic sheet 160 disposed on a second surface (eg, a lower surface) of the substrate 110 corresponding to a surface opposite to the first surface may be further included. That is, the magnetic sheet 160 may be disposed in a direction opposite to the direction in which the loop coil 120 radiates the electromagnetic wave (EMW). The magnetic sheet 160 may prevent the magnetic field for NFC communication from being attenuated due to the generation of eddy current in the lower part of the loop coil 120 . Depending on the embodiment, the magnetic sheet 160 may be a ferrite sheet or a magneto-dielectric material (MDM) sheet.

3 and 4, each of the plurality of turns included in the loop coil 120 is illustrated as having a rectangular shape, but the present invention is not limited thereto, and each of the plurality of turns included in the loop coil 120 It may also have a round or oval shape.

In the case of a conventional NFC antenna, a first end of a loop coil having a plurality of turns is connected to a first antenna terminal on a first surface of a substrate, and a second end of the loop coil is connected to the substrate through a via. On the second side it is connected to a second antenna terminal.

On the other hand, as described above with reference to FIGS. 3 and 4, in the case of the NFC antenna 100a according to embodiments of the present invention, the plurality of turns of the loop coil 120 are connected to the first antenna terminal AED1 and By being formed to pass between the second antenna terminals AED2, the first antenna terminal AED1 is located inside each of the plurality of turns of the loop coil 120, and the second antenna terminal AED2 is connected to the loop coil 120. It may be located outside each of the plurality of turns of. Therefore, each of the plurality of turns of the loop coil 120 does not overlap each other on the first surface of the substrate 110, but the both ends of the loop coil 120 connect to the first antenna terminal AED1 and the second antenna terminal AED1. Each of the two antenna terminals (AED2) can be directly connected.

In this way, since the NFC antenna 100a according to the embodiments of the present invention is not formed on both sides of the substrate 110 but is formed on one side, the manufacturing cost of the NFC antenna 100a is reduced and the production yield is improved. and the thickness can be reduced.

6 is a block diagram illustrating an example of the NFC device shown in FIG. 2 .

Referring to FIG. 6 , an NFC device 20a may include an NFC antenna 100a, a matching circuit 200a, and an NFC chip 300a.

The NFC antenna 100a included in the NFC device 20a of FIG. 6 may be implemented as the NFC antenna 100a shown in FIGS. 3 and 4 .

In FIG. 6, the NFC antenna 100a may be represented as an equivalent circuit of the NFC antenna 100a shown in FIGS. 3 and 4. That is, the loop coil 120 included in the NFC antenna 100a may be indicated as an inductor LL in FIG. 6 .

The matching circuit 200a may be connected between the NFC antenna 100a and the NFC chip 300a. That is, the matching circuit 200a is connected to the NFC antenna 100a through the first antenna terminal AED1 and the second antenna terminal AED2, and transmits the first transmission terminal TX1 and the second transmission terminal TX2. It can be connected with the NFC chip (300a) through. The matching circuit 200a may perform impedance matching between the NFC antenna 100a and the NFC chip 300a.

In one embodiment, the matching circuit 200a may include a first capacitor C1, a second capacitor C2, and a third capacitor C3. The first capacitor C1 may be connected between the first antenna terminal AED1 and the second antenna terminal AED2. The first capacitor C1 configures a resonance circuit together with the loop coil 120 included in the NFC antenna 100a to adjust the resonance frequency of the NFC device 20a to a desired frequency (eg, 13.56 MHz). . The second capacitor C2 may be connected between the first antenna terminal AED1 and the first transmission terminal TX1. The third capacitor C3 may be connected between the second antenna terminal AED2 and the second transmission terminal TX2. However, the configuration of the matching circuit 200a is only an example, and the matching circuit 200a may be implemented in various configurations for impedance matching between the NFC antenna 100a and the NFC chip 300a.

The NFC chip 300a includes a central processing unit (CPU) 310, a memory device 320, a first modulator 331, an oscillator 333, a mixer 335, and a transmitter circuit 330. can do.

During the transmission operation in the reader mode, the CPU 310 reads the output data TD from the memory device 320 and provides it to the first modulator 331, and the first modulator 331 reads the output data TD. The modulation signal MS is generated by modulation, the oscillator 333 generates a carrier signal CW having a frequency corresponding to the carrier frequency (eg, 13.56 MHz), and the mixer 335 generates the carrier signal CW ) and the modulated signal (MS) to generate the transmission modulated signal (TMS).

The transmitter circuit 330 may be connected between the power supply voltage VDD and the ground voltage GND.

The transmission circuit 330 may output the transmission signal TS corresponding to the transmission modulation signal TMS provided from the mixer 335 through the first transmission terminal TX1 and the second transmission terminal TX2. The NFC antenna 100a may radiate electromagnetic waves (EMW) based on the transmission signal TS.

In one embodiment, the transmission circuit 330 connects the first transmission terminal TX1 and the second transmission terminal TX2 to the power supply voltage VDD through a pull-up load or pull-down based on the transmission modulation signal TMS. By connecting to the ground voltage GND through a load, the transmission signal TS corresponding to the transmission modulation signal TMS can be output through the first transmission terminal TX1 and the second transmission terminal TX2.

For example, the transmission circuit 330 connects the first transmission terminal TX1 to the power supply voltage VDD through a pull-up load and applies a pull-down load to the second transmission terminal TX2 based on the transmission modulation signal TMS. by connecting the first transmission terminal TX1 to the ground voltage GND through a pull-down load and connecting the second transmission terminal TX2 to the power supply voltage VDD through a pull-up load. The transmission signal TS corresponding to the transmission modulation signal TMS may be output through the first transmission terminal TX1 and the second transmission terminal TX2.

When the transmission circuit 330 connects the first transmission terminal TX1 to the power voltage VDD through a pull-up load and the second transmission terminal TX2 to the ground voltage GND through a pull-down load, the power voltage The output current generated from (VDD) may be provided to the matching circuit 200a and the NFC antenna 100a through the first transmission terminal TX1 and may be sinked to the ground voltage GND through the second transmission terminal TX2. there is.

When the transmission circuit 330 connects the first transmission terminal TX1 to the ground voltage GND through a pull-down load and connects the second transmission terminal TX2 to the power voltage VDD through a pull-up load, the power supply voltage The output current generated from (VDD) is provided to the matching circuit 200a and the NFC antenna 100a through the second transmission terminal TX2 and is sinked to the ground voltage GND through the first transmission terminal TX1. can

7 is a block diagram illustrating an example of a transmission circuit included in the NFC chip of FIG. 6 .

Referring to FIG. 7 , the transmission circuit 330 includes a first pull-up transistor MP0 , a second pull-up transistor MP1 , a first pull-down transistor MN0 , a second pull-down transistor MN1 , and a driving circuit 337 . can include

The first pull-up transistor MP0 and the second pull-up transistor MP1 are p-type metal oxide semiconductor (PMOS) transistors, and the first pull-down transistor MN0 and the second pull-down transistor MN1 are n-type metal oxide semiconductor (NMOS) transistors. oxide semiconductor) transistor.

The first pull-up transistor MP0 is connected between the power supply voltage VDD and the first transmission terminal TX1, and the first pull-down transistor MN1 is connected between the first transmission terminal TX1 and the ground voltage GND. can

The second pull-up transistor MP1 is connected between the power supply voltage VDD and the second transmission terminal TX2, and the second pull-down transistor MN1 is connected between the second transmission terminal TX2 and the ground voltage GND. can

The driving circuit 337 drives the first pull-up transistor MP0 through the first pull-up drive signal UDS0, drives the first pull-down transistor MN0 through the first pull-down drive signal DDS0, and The second pull-up transistor MP1 may be driven through the pull-up driving signal UDS1 and the second pull-down transistor MN1 may be driven through the second pull-down driving signal DDS1.

The driving circuit 337 selectively turns on one of the first pull-up transistor MP0 and the first pull-down transistor MN0 based on the transmit modulation signal TMS provided from the mixer 335, and the second pull-up transistor ( One of MP1) and the second pull-down transistor MN1 may be selectively turned on.

For example, the driving circuit 337 turns on the first pull-up transistor MP0 and the second pull-down transistor MN1 based on the transmission modulation signal TMS and turns on the second pull-up transistor MP1 and the first pull-down transistor ( By turning off MN0 or turning on second pull-up transistor MP1 and first pull-down transistor MN0 and turning off first pull-up transistor MP0 and second pull-down transistor MN1, the transmission modulation signal TMS is turned off. ) may be output through the first transmission terminal TX1 and the second transmission terminal TX2.

8 is a block diagram illustrating another example of the NFC device shown in FIG. 2 .

Referring to FIG. 8 , the NFC device 20b may include an NFC antenna 100a, a matching circuit 200b, and an NFC chip 300b.

The NFC antenna 100a included in the NFC device 20b of FIG. 8 may be the same as the NFC antenna 100a included in the NFC device 20a of FIG. 6 .

The matching circuit 200b may be connected between the NFC antenna 100a and the NFC chip 300b. That is, the matching circuit 200b is connected to the NFC antenna 100a through the first antenna terminal AED1 and the second antenna terminal AED2, and the first transmission terminal TX1, the second transmission terminal TX2, And it may be connected to the NFC chip 300b through the receiving terminal RX. The matching circuit 200b may perform impedance matching between the NFC antenna 100a and the NFC chip 300b.

The matching circuit 200b included in the NFC device 20b of FIG. 8 may further include a fourth capacitor C4 in the matching circuit 200a included in the NFC device 20a of FIG. 6 . The fourth capacitor C4 may be connected between the first antenna terminal AED1 and the receiving terminal RX. Depending on the embodiment, the fourth capacitor C4 may be connected between the second antenna terminal AED2 and the receiving terminal RX. However, the configuration of the matching circuit 200b is just one example, and the matching circuit 200b may be implemented in various configurations for impedance matching between the NFC antenna 100a and the NFC chip 300b.

The NFC chip 300b included in the NFC device 20b of FIG. 8 may further include a first demodulator 340 in the NFC chip 300a included in the NFC device 20a of FIG. 6 .

As described above, in the reader mode, the NFC antenna 100a can transmit and receive data with an external NFC card by radiating electromagnetic waves (EMW). Since the external NFC card includes a resonant circuit composed of an antenna having an inductance component and a resonant capacitor, when the NFC antenna 100a radiates electromagnetic waves (EMW), the external NFC device 20b present close to the Mutual induction may occur between the NFC card and the NFC antenna 100a. Accordingly, an antenna voltage may be generated between the first antenna terminal AED1 and the second antenna terminal AED2 corresponding to both ends of the NFC antenna 100a through mutual induction with the external NFC card.

The antenna voltage generated in the reader mode may be provided to the NFC chip 300b as a received signal through the fourth capacitor C4 and the receiving terminal RX.

During the reception operation in the reader mode, the first demodulator 340 included in the NFC chip 300b demodulates the reception signal received through the reception terminal RX to generate input data, and converts the input data to the CPU ( 310) can be provided. The CPU 310 may store the input data in the memory device 320 .

9 is a block diagram illustrating another example of the NFC device shown in FIG. 2 .

Referring to FIG. 9 , the NFC device 20c may include an NFC antenna 100a, a matching circuit 200c, and an NFC chip 300c.

The NFC antenna 100a included in the NFC device 20c of FIG. 9 may be the same as the NFC antenna 100a included in the NFC device 20a of FIG. 6 .

The matching circuit 200c may be connected between the NFC antenna 100a and the NFC chip 300c. That is, the matching circuit 200c is connected to the NFC antenna 100a through the first antenna terminal AED1 and the second antenna terminal AED2, and the first transmission terminal TX1, the second transmission terminal TX2, It may be connected to the NFC chip 300c through the receiving terminal RX, the first power terminal L1, and the second power terminal L2. The matching circuit 200c may perform impedance matching between the NFC antenna 100a and the NFC chip 300c.

The matching circuit 200c included in the NFC device 20c of FIG. 9 further includes a fifth capacitor C5 and a sixth capacitor C6 in the matching circuit 200b included in the NFC device 20b of FIG. 8 . can do. The fifth capacitor C5 is connected between the first antenna terminal AED1 and the first power terminal L1, and the sixth capacitor C6 is connected between the second antenna terminal AED2 and the second power terminal L2. can be connected to However, the configuration of the matching circuit 200c is just an example, and the matching circuit 200c may be implemented in various configurations for impedance matching between the NFC antenna 100a and the NFC chip 300c.

The NFC chip 300c included in the NFC device 20c of FIG. 9 includes a rectifier 351, a regulator 353, a power switch 357, A second demodulator 360 and a second modulator 370 may be further included.

As described above, in the card mode, the NFC device 20c may transmit/receive data with the external NFC reader through electromagnetic waves (EMW) emitted from the external NFC reader. That is, mutual induction may occur between the NFC antenna 100a and the external NFC reader based on electromagnetic waves (EMW) radiated from the external NFC reader. Therefore, the mutual induction can generate the antenna voltage VAN between the first antenna terminal AED1 and the second antenna terminal AED2 corresponding to both ends of the NFC antenna 100a.

The antenna voltage VAN may be transferred to the first power terminal L1 and the second power terminal L2 through the fifth capacitor C5 and the sixth capacitor C6.

The rectifier 351 may rectify the antenna voltage VAN received through the first power terminal L1 and the second power terminal L2 to generate a first voltage V1 that is a DC voltage.

The regulator 353 may use the first voltage V1 to generate an internal voltage VINT having a constant voltage level usable inside the NFC chip 300c.

The CPU 310 may operate by receiving a power voltage VDD from a power supply unit such as a battery. Also, the CPU 310 may receive the internal voltage VINT from the regulator 353 through the power switch 357. When the power voltage VDD is above a predetermined level, the CPU 310 may operate using the power voltage VDD and disable the switch control signal SCS to turn off the power switch 357 . Meanwhile, the CPU 310 uses the internal voltage VINT provided from the regulator 353 by turning on the power switch 357 by enabling the switch control signal SCS when the power voltage VDD is below the predetermined level. so it can work.

During the reception operation in the card mode, the second demodulator 360 demodulates signals received through the first power terminal L1 and the second power terminal L2 to generate input data, and converts the input data to the CPU ( 310) can be provided. The CPU 310 may store the input data in the memory device 320 .

During the transmission operation in the card mode, the CPU 310 reads output data from the memory device 320 and provides it to the second modulator 370, and the second modulator 370 modulates the output data to obtain a modulated signal. It can be output through the first power terminal L1 and the second power terminal L2. For example, the second modulator 370 may generate the modulated signal by performing load modulation on the output data. The NFC antenna 100a may transmit the output data to the external NFC reader by causing mutual induction with the external NFC reader based on the modulated signal.

10 is a diagram illustrating another example of an NFC antenna included in the NFC device of FIG. 2 .

Referring to FIG. 10 , an NFC antenna 100b may be formed on a substrate 110 .

The NFC antenna 100b includes a first antenna terminal AED1, a second antenna terminal AED2, a loop coil 120, and a resonant coil formed on a first surface (eg, upper surface) of a substrate 110. (130).

The first antenna terminal AED1, the second antenna terminal AED2, and the loop coil 120 included in the NFC antenna 100b of FIG. 10 include the first antenna terminal 100a included in the NFC antenna 100a of FIGS. 3 and 4, respectively. The antenna terminal AED1 , the second antenna terminal AED2 , and the loop coil 120 may be the same. That is, the NFC antenna 100b of FIG. 10 may be the same as the NFC antenna 100a of FIGS. 3 and 4 except that the resonance coil 130 is further included. Since the NFC antenna 100a of FIGS. 3 and 4 has been described above with reference to FIGS. 3 to 5, duplicate descriptions are omitted here.

Meanwhile, in FIG. 10, the loop coil 120 included in the NFC antenna 100b is shown as including two turns, but as described above with reference to FIGS. 3 and 4, the present invention is not limited thereto, Loop coil 120 may include any number of turns greater than two.

The resonant coil 130 may include a plurality of turns. Also, the resonance coil 130 may be formed to be physically separated from the loop coil 120, the first antenna terminal AED1, and the second antenna terminal AED2. In one embodiment, the resonant coil 130 may be formed of any metal material having high conductivity, such as copper, silver, or aluminum.

In one embodiment, the resonant coil 130 may be formed inside the loop coil 120 . For example, as shown in FIG. 10 , the resonance coil 130 may be located inside the innermost turn among the plurality of turns of the loop coil 120 .

Since a parasitic capacitor is formed between each of the plurality of turns included in the resonance coil 130, the resonance coil 130 may be expressed as an inductor and a capacitor connected in parallel to each other as an equivalent circuit. Accordingly, the resonance coil 130 may be formed to have an appropriate number of turns so that the self-resonance frequency (SFR) of the resonance coil 130 is about 13.56 MHz.

Since the resonant coil 130 is physically separated from the loop coil 120, an electric signal may not be supplied from the loop coil 120. However, the resonance coil 130 may be magnetically coupled to the loop coil 120 . Accordingly, based on the electromagnetic wave (EMW) radiated from the loop coil 120, the resonance coil 130 may also radiate the electromagnetic wave (EMW).

In one embodiment, the loop coil 120 and the resonance coil 130 have substantially the same resonance frequency so that the resonance coil 130 efficiently receives power from the electromagnetic wave EMW radiated from the loop coil 120. can have For example, each of the loop coil 120 and the resonance coil 130 may have a resonance frequency of about 13.56 MHz.

In addition, the resonance coil 130 may be disposed adjacent to the loop coil 120 so that the resonance coil 130 efficiently receives power from the electromagnetic wave (EMW) radiated from the loop coil 120 . For example, a distance LLD1 between an innermost turn among the plurality of turns of the loop coil 120 and an outermost turn among the plurality of turns of the resonance coil 130 may be less than 2 mm.

Although each of the plurality of turns included in the resonance coil 130 is illustrated as having a rectangular shape in FIG. 10, the present invention is not limited thereto, and each of the plurality of turns included in the resonance coil 130 is circular or elliptical. may have a shape.

As described above with reference to FIGS. 3, 4, and 10, since the NFC antenna 100b according to the embodiments of the present invention is not formed over both sides of the substrate 110 but is formed on one side, the NFC antenna 100b The manufacturing cost is reduced, the production yield is improved, and the thickness can be reduced.

Meanwhile, the NFC antenna 100b according to embodiments of the present invention not only radiates electromagnetic waves (EMW) through the loop coil 120, but also uses the loop coil 120 and the resonant coil 130 magnetically coupled. Through this, electromagnetic waves (EMW) can be additionally radiated. In addition, since the resonant coil 130 is physically separated from the matching circuit 200 and has a high Q factor, the intensity of the electromagnetic wave EMW radiated from the resonant coil 130 may be relatively high. Therefore, when the NFC device 20 of FIG. 2 is implemented by including the NFC antenna 100b shown in FIG. 10 , the communication range of the NFC device 20 can be effectively increased.

11 is a block diagram illustrating an example of the NFC device shown in FIG. 2 .

Referring to FIG. 11 , an NFC device 20d may include an NFC antenna 100b, a matching circuit 200, and an NFC chip 300.

The NFC antenna 100b included in the NFC device 20d of FIG. 11 may be implemented as the NFC antenna 100b shown in FIG. 10 .

In FIG. 11 , the NFC antenna 100b may be represented as an equivalent circuit of the NFC antenna 100b shown in FIG. 10 . That is, the loop coil 120 included in the NFC antenna 100b is indicated as an inductor LL in FIG. 11, and the resonant coil 130 included in the NFC antenna 100b is an inductor connected in parallel to each other in FIG. (LR1) and a capacitor (CP).

The matching circuit 200 and the NFC chip 300 included in the NFC device 20d of FIG. 11 are the matching circuit 200a and the NFC chip 300a included in the NFC device 20a of FIG. 6 and the NFC of FIG. 8 It may be implemented as one of the matching circuit 200b and the NFC chip 300b included in the device 20b and the matching circuit 200c and the NFC chip 300c included in the NFC device 20c of FIG. 9 . Matching circuit 200a and NFC chip 300a included in NFC device 20a of FIG. 6, matching circuit 200b and NFC chip 300b included in NFC device 20b of FIG. 8, and FIG. 9 Since the configuration and operation of the matching circuit 200c and the NFC chip 300c included in the NFC device 20c have been described above with reference to FIGS. 6 to 9, duplicate descriptions are omitted here.

As described above with reference to FIGS. 10 and 11 , the NFC antenna 100b included in the NFC device 20d not only radiates electromagnetic waves (EMW) through the loop coil 120 but also transmits electromagnetic waves (EMW) to the loop coil 120 and magnetically Electromagnetic waves (EMW) may be additionally radiated through the resonant coil 130 coupled to . In addition, since the resonant coil 130 is physically separated from the matching circuit 200 and has a high Q factor, the intensity of the electromagnetic wave EMW radiated from the resonant coil 130 may be relatively high. Therefore, the communicable distance of the NFC device 20d can be effectively increased.

12 is a diagram illustrating another example of an NFC antenna included in the NFC device of FIG. 2 .

Referring to FIG. 12 , an NFC antenna 100c may be formed on a substrate 110 .

The NFC antenna 100c includes a first antenna terminal AED1, a second antenna terminal AED2, a loop coil 120, and a resonant coil ( 140), and a resonance capacitor 150.

The first antenna terminal AED1, the second antenna terminal AED2, and the loop coil 120 included in the NFC antenna 100c of FIG. 12 include the first antenna terminal 100a included in the NFC antenna 100a of FIGS. 3 and 4, respectively. The antenna terminal AED1 , the second antenna terminal AED2 , and the loop coil 120 may be the same. That is, the NFC antenna 100c of FIG. 12 may be the same as the NFC antenna 100a of FIGS. 3 and 4 except for further including the resonance coil 140 and the resonance capacitor 150 . Since the NFC antenna 100a of FIGS. 3 and 4 has been described above with reference to FIGS. 3 to 5, duplicate descriptions are omitted here.

Meanwhile, in FIG. 12, the loop coil 120 included in the NFC antenna 100c is shown as including two turns, but as described above with reference to FIGS. 3 and 4, the present invention is not limited thereto, Loop coil 120 may include any number of turns greater than two.

The resonant coil 140 may include one turn. Also, the resonance coil 140 may be formed to be physically separated from the loop coil 120, the first antenna terminal AED1, and the second antenna terminal AED2. In one embodiment, the resonant coil 140 may be formed of any metal material having high conductivity, such as copper, silver, or aluminum.

The resonance capacitor 150 may be connected between both ends of the resonance coil 140 .

In one embodiment, the resonance coil 140 and the resonance capacitor 150 may be formed inside the loop coil 120 . For example, as shown in FIG. 12 , the resonance coil 140 and the resonance capacitor 150 may be located inside an innermost turn among the plurality of turns of the loop coil 120 .

Since the resonance coil 140 and the resonance capacitor 150 are connected in parallel to each other, the resonance coil 140 and the resonance capacitor 150 may form a resonance circuit. The capacitance of the resonance capacitor 150 may be determined so that the resonance frequency of the resonance circuit is about 13.56 MHz.

Since the resonant coil 140 is physically separated from the loop coil 120, an electric signal may not be supplied from the loop coil 120. However, the resonance circuit formed by the resonance coil 140 and the resonance capacitor 150 may be magnetically coupled to the loop coil 120 . Accordingly, based on the electromagnetic wave (EMW) radiated from the loop coil 120, the resonance coil 140 may also radiate the electromagnetic wave (EMW).

In one embodiment, the loop coil 120 and the resonance circuit may have substantially the same resonance frequency so that the resonance coil 140 efficiently receives power from the electromagnetic wave EMW radiated from the loop coil 120. there is. For example, each of the loop coil 120 and the resonant circuit may have a resonant frequency of about 13.56 MHz.

In addition, the resonance coil 140 may be disposed adjacent to the loop coil 120 so that the resonance coil 140 efficiently receives power from the electromagnetic wave (EMW) radiated from the loop coil 120 . For example, a distance LLD2 between an innermost turn of the plurality of turns of the loop coil 120 and the resonance coil 140 may be less than 2 mm.

Although the resonance coil 140 is illustrated as having a rectangular shape in FIG. 12 , the present invention is not limited thereto, and the resonance coil 140 may have a circular or elliptical shape.

As described above with reference to FIGS. 3, 4 and 12, since the NFC antenna 100c according to the embodiments of the present invention is not formed over both sides of the substrate 110 but is formed on one side, the NFC antenna 100c The manufacturing cost is reduced, the production yield is improved, and the thickness can be reduced.

Meanwhile, the NFC antenna 100c according to embodiments of the present invention not only radiates electromagnetic waves (EMW) through the loop coil 120, but also uses the loop coil 120 and the resonant coil 140 magnetically coupled. Through this, electromagnetic waves (EMW) can be additionally radiated. In addition, since the resonant coil 140 is physically separated from the matching circuit 200 and has a high Q factor, the intensity of the electromagnetic wave EMW radiated from the resonant coil 140 may be relatively high. Therefore, when the NFC device 20 of FIG. 2 is implemented by including the NFC antenna 100c shown in FIG. 12 , the communication range of the NFC device 20 can be effectively increased.

In addition, the resonant coil 130 included in the NFC antenna 100b includes a plurality of turns so that the self-resonant frequency is about 13.56 MHz, whereas the resonant coil 140 included in the NFC antenna 100c has one turn. The resonant frequency of the resonant circuit formed by the resonant coil 140 and the resonant capacitor 150 is set to about It can be set to 13.56 MHz. Therefore, the NFC antenna 100c of FIG. 12 can be manufactured more cheaply and simply than the NFC antenna 100b of FIG. 10 .

13 is a block diagram illustrating an example of the NFC device shown in FIG. 2 .

Referring to FIG. 13 , the NFC device 20e may include an NFC antenna 100c, a matching circuit 200, and an NFC chip 300.

The NFC antenna 100c included in the NFC device 20e of FIG. 13 may be implemented as the NFC antenna 100c shown in FIG. 12 .

In FIG. 13 , the NFC antenna 100c may be represented as an equivalent circuit of the NFC antenna 100c shown in FIG. 12 . That is, the loop coil 120 included in the NFC antenna 100c is indicated as an inductor LL in FIG. 13, and the resonant coil 140 included in the NFC antenna 100c is indicated as an inductor LR2 in FIG. 13. And, the resonant capacitor 150 included in the NFC antenna 100c may be indicated as a capacitor CC in FIG. 13 .

The matching circuit 200 and the NFC chip 300 included in the NFC device 20e of FIG. 13 are the matching circuit 200a and the NFC chip 300a included in the NFC device 20a of FIG. 6 and the NFC of FIG. 8 It may be implemented as one of the matching circuit 200b and the NFC chip 300b included in the device 20b and the matching circuit 200c and the NFC chip 300c included in the NFC device 20c of FIG. 9 . Matching circuit 200a and NFC chip 300a included in NFC device 20a of FIG. 6, matching circuit 200b and NFC chip 300b included in NFC device 20b of FIG. 8, and FIG. 9 Since the configuration and operation of the matching circuit 200c and the NFC chip 300c included in the NFC device 20c have been described above with reference to FIGS. 6 to 9, duplicate descriptions are omitted here.

As described above with reference to FIGS. 12 and 13, the NFC antenna 100c included in the NFC device 20e not only radiates electromagnetic waves (EMW) through the loop coil 120, but also transmits electromagnetic waves (EMW) to the loop coil 120 and the magnetic field. Electromagnetic waves (EMW) may be additionally radiated through the resonant coil 140 coupled to . In addition, since the resonant coil 130 is physically separated from the matching circuit 200 and has a high Q factor, the intensity of the electromagnetic wave EMW radiated from the resonant coil 130 may be relatively high. Therefore, the communicable distance of the NFC device 20e can be effectively increased.

14 and 15 are diagrams illustrating examples in which an NFC antenna included in the NFC device of FIG. 2 is mounted on a mobile device.

14 shows a rear surface of the mobile device 10 in a state where the rear cover is detached.

In one embodiment, as shown in FIG. 14 , the NFC antenna 100 may be mounted on the battery pack 11 of the mobile device 10 .

Meanwhile, the matching circuit 200 and the NFC chip 300 included in the NFC device 20 may be included inside the main body of the mobile device 10 .

The first antenna terminal AED1 and the second antenna terminal AED2 of the NFC antenna 100 are electrically connected to the matching circuit 200 through a terminal to which the battery pack 11 is connected to the main body of the mobile device 10. can be connected

The first antenna terminal AED1 and the second antenna terminal AED2 of the NFC antenna 100 may be formed close to each other. For example, as shown in FIG. 14, when the board 110 including the NFC antenna 100 is mounted on the battery pack 11 of the mobile device 10, the first antenna terminal AED1 and the second The distance between the two antenna terminals AED2 may be 2 mm or more and 10 mm or less.

15 shows a rear cover 13 of the mobile device 10 and a rear surface of the mobile device 10 in a state in which the rear cover 13 is detached.

In one embodiment, as shown in FIG. 15 , the NFC antenna 100 may be mounted inside the rear cover 13 of the mobile device 10 .

Meanwhile, the matching circuit 200 and the NFC chip 300 included in the NFC device 20 may be included inside the main body of the mobile device 10 . In addition, a first terminal 15 and a second terminal 17 connected to the matching circuit 200 may be disposed on the rear surface of the mobile device 10 .

The first antenna terminal AED1 and the second antenna terminal AED2 of the NFC antenna 100 may be formed close to each other. For example, as shown in FIG. 15, when the board 110 including the NFC antenna 100 is mounted inside the rear cover 13 of the mobile device 10, the first antenna terminal AED1 The distance between and the second antenna terminal AED2 may be greater than or equal to 2 mm and less than or equal to 20 mm.

When the rear cover 13 is attached to the mobile device 10, the first antenna terminal AED1 and the second antenna terminal AED2 of the NFC antenna 100 are disposed on the rear surface of the mobile device 10, respectively. It may be electrically connected to the first terminal 15 and the second terminal 17 . Therefore, the first antenna terminal (AED1) and the second antenna terminal (AED2) of the NFC antenna 100 are matched through the first terminal 15 and the second terminal 17 disposed on the rear surface of the mobile device 10, respectively. It may be electrically connected to the circuit 200 .

In one embodiment, the NFC antenna 100 may be mounted inside the body frame of the mobile device 10 . In this case, the distance between the first antenna terminal AED1 and the second antenna terminal AED2 may be greater than or equal to 1 mm and less than or equal to 20 mm.

16 is a block diagram illustrating a mobile system according to an embodiment of the present invention.

Referring to FIG. 16 , a mobile system 1000 includes an application processor (AP) 1100 , an NFC device 1200 , a memory device 1300 , a user interface 1400 and a power supply 1500 . The application processor 1100 , the NFC device 1200 , the memory device 1300 , the user interface 1400 , and the power supply 1500 may be connected to each other through an internal bus 1001 .

According to an embodiment, the mobile system 1000 includes a mobile phone, a smart phone, a tablet PC, a personal digital assistant (PDA), and a portable multimedia player (PMP). ), a digital camera, a music player, a portable game console, a navigation system, a laptop computer, and the like.

The application processor 1100 controls overall operations of the mobile system 1000 . The application processor 1100 may execute applications providing Internet browsers, games, and videos. According to embodiments, the application processor 1100 may include one processor core (Single Core) or may include a plurality of processor cores (Multi-Core). For example, the application processor 1100 may include a multi-core such as a dual-core, quad-core, or hexa-core. Also, according to embodiments, the application processor 1100 may further include an internal or external cache memory.

The memory device 1300 stores data necessary for the operation of the mobile system 1000 . For example, the memory device 1300 may store a boot image for booting the mobile system 1000, and may store output data to be transmitted to an external device and input data received from the external device. For example, the memory device 1300 includes electrically erasable programmable read-only memory (EEPROM), flash memory, phase change random access memory (PRAM), resistance random access memory (RRAM), nano floating gate (NFGM), and the like. memory), polymer random access memory (PoRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), or similar memory.

The NFC device 1200 may transmit the output data stored in the memory device 1300 to the external device through NFC and store the input data received from the external device in the memory device 1300. .

The NFC device 1200 includes an NFC antenna 1210, a matching circuit 1220, and an NFC chip 1230.

The NFC device 1200 may be implemented as the NFC device 20 shown in FIG. 2 . Since the configuration and operation of the NFC device 20 of FIG. 2 has been described in detail with reference to FIGS. 1 to 15 , a detailed description of the NFC device 1200 is omitted here.

The user interface 1400 may include one or more input devices such as a keypad or touch screen and/or one or more output devices such as speakers or display devices. The power supply 1500 may supply an operating voltage of the mobile system 1000 .

Also, according to embodiments, the mobile system 1000 may further include an image processor and may further include a storage device such as a memory card or a solid state drive (SSD).

Components of the mobile system 1000 may be mounted using various types of packages, for example, Package on Package (PoP), Ball Grid Arrays (BGAs), Chip Scale Packages (CSPs), and Plastic Leaded Packages (PLCC). Chip Carrier), PDIP(Plastic Dual In-Line Package), Die in Waffle Pack, Die in Wafer Form, COB(Chip On Board), CERDIP(Ceramic Dual In-Line Package), MQFP(Plastic Metric Quad Flat Pack), Thin Quad Flat-Pack (TQFP), Small Outline Integrated Circuit (SOIC), Shrink Small Outline Package (SSOP), Thin Small Outline Package (TSOP), Thin Quad Flat-Pack (TQFP), System In Package (SIP), MCP It may be mounted using packages such as (Multi Chip Package), Wafer-level Fabricated Package (WFP), and Wafer-Level Processed Stack Package (WSP).

The present invention can be usefully used in any mobile device having a Near Field Communication (NFC) device. For example, the present invention relates to a mobile phone, a smart phone, a personal digital assistant (PDA), a portable multimedia player (PMP), a digital camera, and a personal digital assistant. Personal Computer (PC), Server Computer, Workstation, Laptop, Digital Television, Set-Top Box, Music Player , a portable game console, a navigation system, a laptop computer, and the like.

As described above, although it has been described with reference to the preferred embodiments of the present invention, those skilled in the art can make the present invention various without departing from the spirit and scope of the present invention described in the claims below. It will be understood that it can be modified and changed accordingly.

Claims (10)

first and second antenna terminals formed on the first surface of the substrate;
a loop coil formed on the first surface of the substrate, directly connected between the first antenna terminal and the second antenna terminal, and including a plurality of turns;
a resonant coil formed on the first surface of the substrate, physically separated from the loop coil, the first antenna terminal, and the second antenna terminal, and including one turn; and
A resonance capacitor connected between both ends of the resonance coil,
The first antenna terminal is located inside each of the plurality of turns of the loop coil, the second antenna terminal is located outside each of the plurality of turns of the loop coil,
An imaginary straight line passing through the first antenna terminal and the second antenna terminal is parallel to one of the edges of the substrate;
Each of the plurality of turns of the loop coil is a near field communication (NFC) antenna that does not overlap each other. The NFC antenna of claim 1, wherein the plurality of turns of the loop coil pass between the first antenna terminal and the second antenna terminal. The NFC antenna of claim 1, wherein a distance between the first antenna terminal and the second antenna terminal is 2 mm or more and 20 mm or less. delete The NFC antenna of claim 1, wherein the resonant coil is located inside an innermost turn among the plurality of turns of the loop coil. delete delete The NFC antenna of claim 1 , wherein the resonance coil and the resonance capacitor are located inside an innermost turn among the plurality of turns of the loop coil. The NFC antenna of claim 1, wherein a resonant frequency formed by the resonant coil and the resonant capacitor corresponds to 13.56 MHz. A near field communication (NFC) chip generating a transmission signal and outputting the transmitted signal through a first transmission terminal and a second transmission terminal;
A first antenna terminal, a second antenna terminal, and a loop coil formed on a first surface of a substrate and directly connected between the first and second antenna terminals, the loop coil, the first antenna terminal, and the second antenna. An NFC antenna including a resonant coil physically separated from a terminal and including one turn, and a resonant capacitor connected between both ends of the resonant coil, and radiating electromagnetic waves based on the transmission signal; and
A matching circuit connected between the first transmission terminal, the second transmission terminal, the first antenna terminal, and the second antenna terminal and performing impedance matching between the NFC chip and the NFC antenna,
The loop coil includes a plurality of turns, the first antenna terminal is located inside each of the plurality of turns of the loop coil, and the second antenna terminal is located inside each of the plurality of turns of the loop coil. located outside,
An imaginary straight line passing through the first antenna terminal and the second antenna terminal is parallel to one of the edges of the substrate;
NFC device wherein each of the plurality of turns of the loop coil does not overlap each other.

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