KR102533402B1 - Antenna for near filed communication, accessory and electronic apparatus including the same - Google Patents

Abstract

The present invention relates to electronics for NFC including mobile devices and accessories. An electronic device according to an embodiment of the present invention may include an NFC antenna and a mobile device. The NFC antenna may include a first coil and a second coil separated from the first coil. The mobile device may include a first coil. The second coil may be disposed outside of the mobile device. An electronic device according to an embodiment of the present invention can increase the degree of freedom of antenna arrangement by using an accessory.

Description

Antennas for short-distance wireless communication, accessories, and electronic devices including them

The present invention relates to an electronic device for near field communication (hereinafter referred to as NFC) including a mobile device and an accessory.

An RFID (Radio Frequency Identification) system belongs to the field of automatic recognition using radio waves, and is also referred to as a radio frequency identification system that wirelessly recognizes pre-stored predetermined information using radio waves such as very short waves or long waves. According to the operating principle of the RFID system, a reader can receive and analyze information stored in a tag to obtain unique information of a tag-mounted item.

These RFID systems generally consist of a reader, an antenna, and a tag, and the antenna serves as a relay between the tag and the reader. The reader may activate the tag or receive a response from the activated tag by transmitting power and a signal to the tag using a signal of a predetermined frequency.

On the other hand, NFC (Near Field Communication), a field of RFID, uses a frequency of 13.56 MHz and is defined as a standard in ISO 18092 as a wireless communication that transmits data in a short distance. NFC can perform short-range wireless communication using various frequency signals including 125 kHz, 135 kHz, and 900 MHz in addition to a frequency of 13.56 MHz.

NFC can enable data transmission and reception between adjacent devices. For example, the device may be a smart phone, a tablet PC, a laptop computer, a digital camera, or a smart watch. For example, the data may be credit card information, transportation card information, mobile coupon information, ticket information, or image information. NFC using a predetermined frequency band has high stability and can be used for mobile payment or payment such as a transportation card. NFC can also be used in an information terminal that obtains various types of information when approaching a tag storing predetermined information.

NFC can operate in peer to peer (P2P), card emulation, or reader mode. The P2P mode is a mode in which data can be transmitted and received between two devices that support NFC. The card emulation mode is a mode in which a device supporting NFC can operate like a tag of an existing RFID card. The reader mode is a mode in which a device supporting NFC can read information from a specific tag.

In a conventional mobile device, a battery may be separated, and an antenna may be disposed in a battery or a case for removing the battery. To this end, a conventional mobile device may arrange a battery, a case for separating the battery, or a contact terminal on the mobile device. Recently, mobile devices have a problem in that an antenna cannot be disposed in a conventional manner because the battery is integrally manufactured. In addition, there is a problem in that an antenna cannot be freely disposed inside the mobile device due to a battery, a camera, a PCB or a USIM chip reader, and the like. Due to the above problems, mobile devices have a problem in that they cannot support both mobile payment and payment functions.

For example, smart phones with a built-in NFC chip can be used as a purchase means by inputting personal card information into the smart phone. However, smart phones having an NFC chip cannot perform payment by recognizing an external mobile card or credit card due to antenna size and performance limitations.

The present invention is to solve the above-described technical problem, the present invention is to provide an electronic device in which an antenna can be disposed in an accessory.

An electronic device according to an embodiment of the present invention may include an NFC antenna and a mobile device. The NFC antenna may include a first coil and a second coil separated from the first coil. The mobile device may include a first coil. The second coil may be disposed outside of the mobile device.

An accessory according to an embodiment of the present invention may include at least one of a first coil and a second coil included in an NFC antenna. An accessory can be attached to or detached from a mobile device.

An NFC antenna according to an embodiment of the present invention may include a first coil and a second coil. The first coil may be disposed in a mobile device. The second coil may be separated from the first coil and disposed outside the mobile device. The distance between the first coil and the second coil may be within a range of 0 to 10 mm.

An electronic device according to an embodiment of the present invention can increase the degree of freedom of antenna arrangement by using an accessory.

1 is a block diagram showing an electronic device according to an embodiment of the present invention by way of example.
2 and 3 are diagrams showing the antenna shown in FIG. 1 as an example.
4 is a diagram exemplarily showing an equivalent circuit of an antenna according to an embodiment of the present invention.
5 is a diagram showing a matching circuit according to an embodiment of the present invention by way of example.
6 is a block diagram showing an electronic device according to an embodiment of the present invention by way of example.
7 to 13 are diagrams showing the antenna shown in FIG. 6 by way of example.
14 is a diagram showing an equivalent circuit of the antenna according to the embodiment of the present invention shown in FIGS. 7 and 8 by way of example.
15 is a diagram showing an equivalent circuit of the antenna according to the embodiment of the present invention shown in FIGS. 10 and 11 by way of example.
16 is a diagram showing an equivalent circuit of the antenna according to the embodiment of the present invention shown in FIGS. 12 and 13 by way of example.
17 is a diagram showing a matching circuit according to an embodiment of the present invention by way of example.
18 is a block diagram showing a mobile device according to an embodiment of the present invention by way of example.
19 to 30 are diagrams showing application examples of the present invention by way of example.
31 is a flowchart exemplarily showing a mobile payment method according to an embodiment of the present invention.
FIG. 32 is a diagram showing a user interface for performing payment executed in step S200 shown in FIG. 31 by way of example.
FIG. 33 is a diagram showing a user interface for contact executed in step S300 shown in FIG. 31 as an example.
34 and 35 exemplarily show a user interface for completing a payment executed in step S400 shown in FIG. 31 .

In the following, embodiments of the present invention will be described clearly and in detail to the extent that a person skilled in the art can easily practice the present invention.

1 is a block diagram showing an electronic device according to an embodiment of the present invention by way of example. Referring to FIG. 1 , an electronic device 100 may include a mobile device 110 and an accessory 120 .

The mobile device 110 may be a mobile phone, a smart phone, a tablet PC, a laptop computer, a digital camera, a smart ring, or a smart watch. The mobile device 110 may support NFC. The mobile device 110 may transmit/receive data with other mobile devices.

Accessory 120 can be attached to some or all of mobile device 110 . The accessory 120 may be detachable from the mobile device 110 . For example, the accessory 120 may be made of leather, urethane, plastic, or metal. For example, the accessory 120 may be a film completely adhered to one surface of the mobile device 110 . For example, the accessory 120 may be a cover, sticker, non-slip pad, film, auxiliary battery, or smart grip. The accessory 120 is not limited to the above, and may be manufactured in various forms to protect the mobile device 110 . Accessory 120 may be manufactured in a variety of shapes to enhance the aesthetic sense of mobile device 110 .

Referring to FIG. 1, the mobile device 110 includes an application processor (AP) 111, an NFC transceiver (NFC Transceiver) 112, a matching circuit (113), and terminals 114 and 115. can include

The application processor 111 includes hardware circuits (eg, one or more processors) and may operate to provide various user applications provided by the electronic device 100 . User applications may include voice call operations, data transmission, and the like.

The application processor 111 may execute programs through which the electronic device 100 transmits and receives information such as photos and videos with other mobile devices. The application processor 111 may execute programs allowing the electronic device 100 to operate like a card. The application processor 111 may execute programs for Mobile Point of Sales (mPOS). These programs may provide credit card purchase and payment functions using the electronic device 100 .

The NFC transceiver 112 may be configured to transmit and receive NFC signals using inductive coupling for wireless communication. The NFC transceiver 112 may provide NFC signals to the antenna 130 via the matching circuit 113 . The antenna 130 may transmit NFC signals through inductive coupling. The antenna 130 may receive NFC signals (provided from another electronic device (not shown) capable of transmitting and receiving NFC signals). The antenna 130 may provide the received NFC signals to the NFC transceiver 112 via the matching circuit 113 .

The NFC transceiver 112 is described in NFC Interface and Protocol-1 (NFCIP-1) and NFC Interface and Protocol-2 (NFCIP-2) and complies with ECMA-340, ISO/IEC 18092, ETSI TS 102 190, ISO 21481, ECMA 352, ETSI TS 102 312, etc. can operate in accordance with standardized regulations.

The matching circuit 113 may be connected to the NFC transceiver 112 and the antenna 130 . The matching circuit 113 may include an electromagnetic compatibility filter (EMC) that reduces a 13.56 MHz frequency harmonic component when the electronic device 100 performs NFC. The matching circuit 113 may include a capacitor or the like for impedance matching. Impedance matching may be required for transmission and reception of signals between the NFC transceiver 112 and the antenna 130 . A detailed structure of the matching circuit 113 will be described later with reference to FIG. 5 .

Terminals 114 and 115 may be connected to the matching circuit 113 . Terminals 114 and 115 may be physically or electrically connected to terminals 124 and 125 of an accessory to be described later. For example, terminals 114 and 115 may be directly connected to terminals 124 and 125 or may be connected using wires.

Referring to FIG. 1 , accessory 120 may include terminals 124 and 125 and an antenna 130 . Terminals 124 and 125 may be connected to antenna 130 . The terminals 124 and 125 may be physically or electrically connected to the terminals 114 and 115 of the mobile device. For example, the terminals 124 and 125 may be directly connected to the terminals 114 and 115 or may be connected using wires.

Antenna 130 may be connected to terminals 124 and 125 . The antenna 130 may also be connected to the matching circuit 113 through terminals 114 , 115 , 124 , and 125 . The antenna 130 may receive signals generated by the application processor 111 through the NFC transceiver 112 and the matching circuit 113 . The antenna 130 may be used to receive external NFC signals. Antenna 130 may be used to transmit NFC signals to another mobile device, card, card reader, or the like. Antenna 130 may be used for transmission and reception of NFC signals by inductive coupling.

Referring to FIG. 1 , an electronic device 100 according to an embodiment of the present invention may include an antenna 130 disposed in an accessory 120. Through this, the degree of freedom of arrangement of the antenna 130 can be improved.

2 and 3 are diagrams showing the antenna shown in FIG. 1 as an example. Referring to FIGS. 2 and 3 , the antenna 130 may include a first coil 131 and a second coil 132 . The first coil 131 may be connected to terminals 124 and 125 . The first coil 131 and the second coil 132 may be disposed separately from each other. Referring to FIG. 2 , the first coil 131 and the second coil 132 may be implemented in a rectangular spiral shape. Referring to FIG. 3 , the first coil 131 and the second coil 132 may be implemented in a helical shape.

The length, thickness, width, position, or number of turns of each coil, or the width between coils may be determined by inductance or capacitance required for a resonant frequency. The number of turns, width, length, location, and thickness of each of the first coil 131 and the second coil 132 are not limited to those shown in FIGS. 2 and 3 . Also, referring to FIGS. 2 and 3 , there is an area where the coils 131 and 132 overlap. The overlapping regions may be separated through an insulating material. For example, the coil may be disposed in a plurality of layers through vias (not shown), and an insulating material may be disposed between each layer.

The first coil 131 or the second coil 132 may be manufactured using various materials. For example, copper or Litz-Wire may be used. The first coil 131 and the second coil 132 may be implemented on a printed circuit board (PCB) or a flexible printed circuit board (FPCB). The first coil 131 or the second coil 132 according to an embodiment of the present invention is not limited to those shown in FIGS. 2 and 3 and may be manufactured in various shapes or materials.

Referring to FIGS. 2 and 3 , a capacitor may be further connected to both ends of the second coil 132 . A capacitor may be added to the second coil 132 for frequency tuning. Although not shown, when the second coil 132 does not include a capacitor, both ends of the second coil 132 may be directly connected. Although not shown, like the second coil 132, the first coil 131 may further include a capacitor. An equivalent circuit of the antenna 130 will be described below.

4 is a diagram exemplarily showing an equivalent circuit of an antenna according to an embodiment of the present invention. FIG. 4 will be described with reference to FIGS. 2 and 3 . Referring to FIG. 4 , the antenna 130 may be represented by an equivalent circuit including a first inductor (Inductor, L1), a second inductor (L2), a first capacitor (C1), or a second capacitor (C2). . The first inductor L1 means an inductor component of the first coil 131 . The first capacitor C1 means a capacitor component of the first coil 131. The second inductor L2 means an inductor component of the second coil 132 . The second capacitor C2 means a capacitor component of the second coil 132.

The first inductor L1 and the first capacitor C1 may form a parallel resonator. The second inductor L2 and the second capacitor C2 may constitute a parallel resonator. Each inductor may be determined according to the shape, thickness, or space of each coil. Each capacitor may be a parasitic capacitor or a lumped element. When each capacitor is a lumped constant element, each of the first coil 131 and the second coil 132 may further include capacitors at both ends.

Referring to FIG. 4 , each inductor and each capacitor may be connected in parallel. Although not shown, each inductor and each capacitor may be connected in series. Although not shown, each of the first coil 131 and the second coil 132 may further include a resistor.

When the electronic device 100 transmits NFC signals, a magnetic field may be formed around the first inductor L1 due to a current flowing through the first inductor L1. An induced current may flow in the second inductor L2 by the formed magnetic field. That is, the second inductor L2 may receive power from the first inductor L1 by magnetic induction. The second inductor L2 and the second capacitor C2 may be resonated at a center frequency (eg, 13.56 MHz) among frequency bands occupied by the NFC signal by the above-described power.

When the electronic device 100 receives NFC signals, the parallel resonator including the second inductor L2 and the second capacitor C2 may be resonated by the NFC signal transmitted from the external device. The first inductor L1 may receive power from the second inductor L2 by magnetic induction. The first inductor L1 and the first capacitor C1 may be resonated by the above-described power. NFC signals may be transferred to the application processor 111 via the matching circuit 113 and the NFC transceiver 112 .

As shown in FIG. 4 , the first inductor L1 and the second inductor L2 may be separately disposed for transmitting and receiving NFC signals. Since the first inductor L1 and the second inductor L2 are separated, an electromagnetic induction phenomenon may occur between them. Since the first inductor L1 and the second inductor L2 are separated, the electronic device 100 can improve transmission and reception performance (Quality Factor) of NFC signals. Although not shown, the antenna 130 may include only the first coil (see FIGS. 2 and 3, 131). The antenna 130 may include a second coil (see FIGS. 2 and 3 132 ) in addition to the first coil (see 131 of FIGS. 2 and 3 ). That is, in order to improve transmission/reception performance of the antenna 130, the antenna 130 may further include a second coil (see FIGS. 2 and 3, 132).

The size of the antenna (or the area where the antenna is formed) may be changed according to the use or purpose. For example, the antenna size used in the mPOS method for credit card payment may be different from the antenna size used in the P2P method for data communication.

The electronic device 100 according to an embodiment of the present invention may include an antenna 130 disposed inside the accessory 120 . That is, the first coil 131 and the second coil 132 may be disposed inside the accessory 120 . Through this, the degree of freedom of arrangement of the antenna 130 can be improved. The electronic device 100 according to an embodiment of the present invention may support NFC P2P mode, reader mode, and card emulation modes by placing the antenna 130 on the accessory 120 .

5 is a diagram showing a matching circuit according to an embodiment of the present invention by way of example. Referring to FIG. 5 , the matching circuit 113 may include inductors L7 and L8 and capacitors C7, C8, C9 and C10. The inductors L7 and L8 and the capacitors C7 and C8 may be configured as an electromagnetic compatibility filter (EMC). The EMC filter (Electromagnetic Compatibility Filter) can reduce the harmonic component of the 13.56 MHz frequency of NFC signals. The sizes of the inductors L7 and L8 and the capacitors C7 and C8 may be determined in consideration of harmonic components.

Capacitors C9 and C10 may be used for impedance matching. The size of the capacitors C9 and C10 may be determined considering each load of the NFC transceiver 112, the terminals 114, 115, 124, and 125, or the antenna 130. The sizes of the capacitors C7 and C8 and the inductors L7 and L8 may be determined in consideration of the respective loads of the capacitors C9 and C10 and the NFC transceiver 112 .

6 is a block diagram showing an electronic device according to an embodiment of the present invention by way of example. FIG. 6 will be described with reference to FIG. 1 . Referring to FIG. 6 , the electronic device 200 may include a mobile device 210 or an accessory 220 . The mobile device 210 and the accessory 220 of the electronic device 200 may each perform the same function as the mobile device 110 and the accessory 120 of the electronic device 100 described above.

Referring to FIG. 6 , a mobile device 210 may include an application processor 211 , an NFC transceiver 212 , and a matching circuit 213 . The application processor 211, the NFC transceiver 212, and the matching circuit 213 of the mobile device 210 are the application processor 111, the NFC transceiver 112, and the matching circuit 113 of the mobile device 110 described above. ) and each perform the same function, so the description thereof will be omitted. Referring to FIG. 6 , unlike the antenna 130 shown in FIG. 1 disposed on the accessory 120, the antenna 230 may be disposed on the mobile device 210 and the accessory 220. For example, the antenna 230 may be composed of a plurality of coils. Some coils of antenna 230 may be placed on mobile device 210 and the remaining coils of antenna 230 may be placed on accessory 220 .

7 to 13 are diagrams showing the antenna shown in FIG. 6 by way of example. Referring to FIGS. 7 and 8 , the antenna 230 may include a first coil 231 and a second coil 232 . The first coil 231 may be disposed in the mobile device 210 . Second coil 232 may be disposed on accessory 220 . The first coil 231 and the second coil 232 may be disposed separately from each other. Referring to FIG. 7 , the first coil 231 and the second coil 232 may be implemented in a rectangular spiral shape. Referring to FIG. 8 , the first coil 231 and the second coil 232 may be implemented in a helical shape. The number of turns, width, length, location, and thickness of each of the first coil 231 and the second coil 232 are not limited to those shown in FIGS. 7 and 8 . 7 to 13 , there is a region where the coils 231 and 232 overlap, and a region where the third coil 233 and the second coil 232 overlap. The overlapping regions may be separated through an insulating material. For example, the coil may be disposed in a plurality of layers through vias (not shown), and an insulating material may be disposed between each layer. Referring to FIGS. 7 and 8, the second A capacitor may be further connected to both ends of the coil 232 . A capacitor may be added to the second coil 232 for frequency tuning. Although not shown, when the second coil 232 does not include a capacitor, both ends of the second coil 232 may be directly connected. Although not shown, like the second coil 232, the first coil 231 may further include a capacitor.

Referring to FIGS. 7 and 8 , the distance between the mobile device 210 and the accessory 220 is d1. The distance between the first coil 231 and the second coil 232 is d2. FIG. 9 is a diagram illustrating a distance d1 between the mobile device 210 and the accessory 220 and a distance d2 between the first coil 231 and the second coil 232 for easy understanding. d1 and d2 may be appropriately set to generate electromagnetic induction between the inductor of the first coil 231 and the inductor of the second coil 232 . For example, d1 may be 5 mm or less. For example, d2 may be 10 mm or less.

Since the first coil 231 and the second coil 232 are different from the first coil 131 and the second coil 132 described above and have different positions and perform the same function, a detailed description thereof will be omitted. do it with

Referring to FIGS. 10 and 11 , the antenna 230 may include a first coil 231 , a second coil 232 , and a third coil 233 . The first coil 231 may be disposed in the mobile device 210 . The second coil 232 and the third coil 233 may be disposed in the accessory 220. Compared to FIGS. 7 and 8, in order to improve performance of transmitting and receiving NFC signals, the antenna 230 includes the second coil ( 232) and a separate third coil 233 may be further included. Like the inductor of the second coil 232 and the inductor of the first coil 231, a magnetic induction phenomenon may also occur in the inductor of the third coil 233. Referring to FIG. 10 , the third coil 233 may be implemented in a rectangular spiral shape. Referring to FIG. 11 , the third coil 233 may be implemented in a helical shape. The number of turns, width, length, location, and thickness of the third coil 233 are not limited to those shown in FIGS. 10 and 11 .

Referring to FIGS. 10 and 11 , a capacitor may be further connected to both ends of the third coil 233 . A capacitor may be added to the third coil 233 for frequency tuning. Although not shown, when the third coil 233 does not include a capacitor, both ends of the third coil 233 may be directly connected. Since the first coil 231 and the second coil 232 are different from the first coil 131 and the second coil 132 described above and have different positions and perform the same function, a detailed description thereof will be omitted. do it with The third coil 233 may be disposed separately from the second coil 232 . Since the third coil 233 differs from the second coil 232 only in a position and performs the same function, a detailed description thereof will be omitted.

Referring to FIGS. 10 and 11 , the distance between the mobile device 210 and the accessory 220 is d1. The distance between the first coil 231 and the second coil 232 is d2. d1 and d2 may be appropriately set to generate electromagnetic induction between the inductor of the first coil 231 and the inductor of the second coil 232 . For example, d1 may be 5 mm or less. For example, d2 may be 10 mm or less.

Referring to FIGS. 12 and 13 , the antenna 230 may include a first coil 231 , a second coil 232 , a third coil 233 , and a fourth coil 234 . The first coil 231 may be disposed in the mobile device 210 . The second coil 232 , the third coil 233 , and the fourth coil 234 can be disposed on the accessory 220 . In this case, accessory 220 may be a flip cover of mobile device 210 . Compared to FIGS. 10 and 11 , in order to improve performance of transmitting and receiving NFC signals, the antenna 230 may further include a fourth coil 234 connected to the third coil 233 . Although not shown, the fourth coil 234 may not be connected to the third coil 233 . When the flip cover is closed, an electromagnetic induction phenomenon may be generated in the inductor of the fourth coil 234 as well as in the inductors of the third coil 233, the second coil 232, and the first coil 231. Referring to FIG. 12 , the fourth coil 234 may be implemented in a rectangular spiral shape. Referring to FIG. 13 , the fourth coil 234 may be implemented in a helical shape. The number of turns, width, length, location, and thickness of the fourth coil 234 are not limited to those shown in FIGS. 12 and 13 .

Referring to FIGS. 12 and 13 , a capacitor may be further connected to both ends of the fourth coil 234 . A capacitor may be added to the fourth coil 234 for frequency tuning. Although not shown, when the fourth coil 234 does not include a capacitor, both ends of the fourth coil 234 may be directly connected.

The first coil 231, the second coil 232, and the third coil 233 are the first coil 231, the second coil 232, and the third coil 233 described with reference to FIGS. 10 and 11. ) and each perform the same function, so a detailed description thereof will be omitted. The third coil 233 may be disposed on the rear surface of the flip cover. The fourth coil 234 may be connected to the third coil 233 and disposed on the front surface of the flip cover. Since the fourth coil 234 differs from the third coil 233 only in a position and performs the same function, a detailed description thereof will be omitted.

Referring to FIGS. 12 and 13 , the second coil 232 and the third coil 233 may be disposed on the back side of the flip cover, and the fourth coil 234 may be disposed on the front side of the flip cover. Although not shown, the second coil 232, the third coil 233, and the fourth coil 234 may all be disposed on the front side of the flip cover or the back side of the flip cover. Although not shown, the second coil 232 and the third coil 233 may be disposed on the front surface of the flip cover, and the fourth coil 234 may be disposed on the rear surface of the flip cover.

Referring to FIGS. 12 and 13 , the distance between the mobile device 210 and the accessory 220 is d1. The distance between the first coil 231 and the second coil 232 is d2. d1 and d2 may be appropriately set to generate electromagnetic induction between the inductor of the first coil 231 and the inductor of the second coil 232 . For example, d1 may be 5 mm or less. For example, d2 may be 10 mm or less.

Referring to FIGS. 7 to 13 , the mobile device 210 may be a mobile phone, a smart phone, a tablet PC, a laptop computer, a digital camera, a smart ring, or a smart watch. Accessory 220 can be attached to some or all of mobile device 210 . The accessory 220 may be detachable from the mobile device 210 . For example, the accessory 220 may be made of leather, urethane, plastic, or metal. For example, the accessory 220 may be a film completely adhered to one surface of the mobile device 210 . For example, the accessory 220 may be a cover, sticker, non-slip pad, film, auxiliary battery, or smart grip. The accessory 220 is not limited to the above, and may be manufactured in various forms to protect the mobile device 210 . Accessory 220 may be manufactured in a variety of shapes to enhance the aesthetics of mobile device 210 .

7 to 13, the coils 231, 232, 233, and 234 may be disposed in the center of the mobile device 210 or the accessory 220, and may be implemented in a rectangular spiral shape or a helical shape. However, the present invention will not be limited thereto. That is, the coils 231 , 232 , 233 , and 234 may be disposed utilizing all space of the mobile device 210 or the accessory 220 . In the aforementioned space, the coils 231, 232, 233, and 234 may be implemented in any form forming a loop.

14 is a diagram showing an equivalent circuit of the antenna according to the embodiment of the present invention shown in FIGS. 7 and 8 by way of example. 14 will be described with reference to FIGS. 7 and 8 . Referring to FIG. 14 , the antenna 230 may be represented as an equivalent circuit including a first inductor L3, a second inductor L4, a first capacitor C3, or a second capacitor C4. The first inductor L3 means an inductor component of the first coil 231 . The first capacitor C3 means a capacitor component of the first coil 231. The second inductor L4 means an inductor component of the second coil 232 . The second capacitor C4 means a capacitor component of the second coil 232.

The first inductor L3 and the first capacitor C3 may constitute a parallel resonator. The second inductor L4 and the second capacitor C4 may constitute a parallel resonator. Each inductor may be determined according to the shape, thickness, or space of each coil. Each capacitor may be a parasitic capacitor or a lumped element. When each capacitor is a lumped constant element, each of the first coil 231 and the second coil 232 may further include capacitors.

Referring to FIG. 14 , each inductor and each capacitor may be connected in parallel. Although not shown, each inductor and each capacitor may be connected in series. Although not shown, each of the first coil 231 and the second coil 232 may further include a resistor.

When the electronic device 200 transmits NFC signals, a magnetic field may be formed around the first inductor L3 due to a current flowing through the first inductor L3. An induced current may flow through the second inductor L4 by the formed magnetic field. That is, the second inductor L4 may receive power from the first inductor L3 by magnetic induction. The second inductor L4 and the second capacitor C4 may be resonated at a center frequency (eg, 13.56 MHz) among frequency bands occupied by the NFC signal by the above-described power.

When the electronic device 200 receives the NFC signals, the parallel resonator including the second inductor L4 and the second capacitor C4 may be resonated by the NFC signal transmitted from the external device. The first inductor L3 may receive power from the second inductor L4 by magnetic induction. The first inductor (L3) and the first capacitor (C3) may be resonated by the above-described power. NFC signals may be transferred to the application processor 211 via the matching circuit 213 and the NFC transceiver 212 .

As shown in FIG. 14 , the first inductor L3 and the second inductor L4 may be disposed separately for transmission and reception of NFC signals. Since the first inductor L3 and the second inductor L4 are separated, an electromagnetic induction phenomenon may occur between them. Since the first inductor L3 and the second inductor L4 are separated, the electronic device 200 can improve performance of transmitting and receiving NFC signals. Although not shown, the antenna 230 may include only the first coil (refer to FIGS. 7 and 8 , 231 ). The antenna 230 may include a second coil (see FIGS. 7 and 8 232) in addition to the first coil (see 231 of FIGS. 7 and 8). That is, transmission/reception performance of the antenna 230 can be improved through electromagnetic induction between the first coil (see FIGS. 7 and 8 , 231 ) and the second coil (see FIGS. 7 and 8 , 232 ).

15 is a diagram showing an equivalent circuit of the antenna according to the embodiment of the present invention shown in FIGS. 10 and 11 by way of example. 15 will be described with reference to FIGS. 10 and 11 . Referring to FIG. 15, the antenna 230 may include a first inductor L3, a second inductor L4, a third inductor L5, a first capacitor C3, a second capacitor C4, or a third capacitor. It can be expressed as an equivalent circuit including (C5). Since each of the first inductor L3, the second inductor L4, the first capacitor C3, and the second capacitor C4 performs the same function as described in FIG. 14, a description thereof will be omitted.

Referring to FIG. 15 , the third inductor L5 means an inductor component of the third coil (refer to FIGS. 10 and 11 , 233 ). The third capacitor C5 means a capacitor component of the third coil (see FIGS. 10 and 11, 233). The third inductor L5 and the third capacitor C5 may form a parallel resonator. When the third capacitor is a lumped constant element, the antenna 230 may further include capacitors connected to the third coil (see FIGS. 10 and 11, 233). Although not shown, the third inductor L5 and the third capacitor C5 may be connected in series. Although not shown, the third coil (see FIGS. 10 and 11 233 ) may further include a resistor.

When the electronic device 200 transmits NFC signals, a magnetic field may be formed around the first inductor L3 due to a current flowing through the first inductor L3. An induced current may flow through the second inductor L4 and the third inductor L5 by the formed magnetic field. That is, the second inductor L4 and the third inductor L5 may receive power from the first inductor L3 by magnetic induction. The second inductor L4 and the second capacitor C4 may be resonated at a center frequency (eg, 13.56 MHz) among frequency bands occupied by the NFC signal by the above-described power. The third inductor L5 and the third capacitor C5 may be resonated at a center frequency (eg, 13.56 MHz) among frequency bands occupied by the NFC signal by the above-described power.

When the electronic device 200 receives the NFC signals, the parallel resonator including the second inductor L4 and the second capacitor C4 may be resonated by the NFC signal transmitted from the external device. When the electronic device 200 receives the NFC signals, the parallel resonator including the third inductor L5 and the third capacitor C5 may be resonated by the NFC signal transmitted from the external device. The first inductor L3 may receive power from the second inductor L4 and the third inductor L5 by magnetic induction. The first inductor (L3) and the first capacitor (C3) may be resonated by the above-described power. NFC signals may be transferred to the application processor 211 via the matching circuit 213 and the NFC transceiver 212 .

As shown in FIG. 15 , each of the first inductor L3, the second inductor L4, and the third inductor L5 may be separately disposed for transmitting and receiving NFC signals. Since the first inductor L3, the second inductor L4, and the third inductor L5 are separated from each other, the electronic device 200 can improve performance of transmitting and receiving NFC signals. Although not shown, the antenna 230 may include only the first coil (see FIGS. 10 and 11, 231). The antenna 230 may include a second coil (see FIGS. 10 and 11, 232) and a third coil (see FIGS. 10 and 11, 233) in addition to the first coil (231, see FIGS. 10 and 11). can That is, in order to improve transmission and reception performance of the antenna 230, the antenna 230 may further include a second coil (see FIGS. 10 and 11, 232) and a third coil (see FIGS. 10 and 11, 233). there is.

16 is a diagram showing an equivalent circuit of the antenna according to the embodiment of the present invention shown in FIGS. 12 and 13 by way of example. 16 will be described with reference to FIGS. 12 and 13 . Referring to FIG. 16, the equivalent circuit of the antenna 230 includes a first inductor (L3), a second inductor (L4), a third inductor (L5), a fourth inductor (L6), a first capacitor (C3), A second capacitor C4, a third capacitor C5, or a fourth capacitor C6 may be included. Since each of the first inductor L3, the second inductor L4, the first capacitor C3, and the second capacitor C4 performs the same function as described in FIG. 14, a description thereof will be omitted. Since each of the third inductor L5 and the third capacitor C5 performs the same function as that described in FIG. 15, a description thereof will be omitted.

Referring to FIG. 16 , the fourth inductor L6 means an inductor component of the fourth coil (see FIGS. 12 and 13 , 234 ). The fourth capacitor C6 means a capacitor component of the fourth coil (see FIGS. 12 and 13, 234). The fourth inductor L6 and the fourth capacitor C6 may form a parallel resonator. When the fourth capacitor is a lumped constant element, the antenna 230 may further include capacitors connected to the fourth coil (see FIGS. 12 and 13, 234). Although not shown, the fourth inductor L6 and the fourth capacitor C6 may be connected in series. Although not shown, the fourth coil (see FIGS. 12 and 13 234) may further include a resistor.

When the electronic device 200 transmits NFC signals, a magnetic field may be formed around the first inductor L3 due to a current flowing through the first inductor L3. An induced current may flow through the second inductor L4, the third inductor L5, and the fourth inductor L6 by the formed magnetic field. That is, the second inductor L4, the third inductor L5, and the fourth inductor L6 may receive power from the first inductor L3 by magnetic induction. The second inductor L4 and the second capacitor C4 may be resonated at a center frequency (eg, 13.56 MHz) among frequency bands occupied by the NFC signal by the above-described power. The third inductor L5 and the third capacitor C5 may be resonated at a center frequency (eg, 13.56 MHz) among frequency bands occupied by the NFC signal by the above-described power. The fourth inductor L6 and the fourth capacitor C6 may be resonated at a center frequency (eg, 13.56 MHz) among frequency bands occupied by the NFC signal by the above-described power.

When the electronic device 200 receives the NFC signals, the parallel resonator including the second inductor L4 and the second capacitor C4 may be resonated by the NFC signal transmitted from the external device. When the electronic device 200 receives the NFC signals, the parallel resonator including the third inductor L5 and the third capacitor C5 may be resonated by the NFC signal transmitted from the external device. When the electronic device 200 receives the NFC signals, the parallel resonator including the fourth inductor L6 and the fourth capacitor C6 may be resonated by the NFC signal transmitted from the external device. The first inductor L3 may receive power from the second inductor L4, the third inductor L5, and the fourth inductor L6 by magnetic induction. The first inductor (L3) and the first capacitor (C3) may be resonated by the above-described power. NFC signals may be transferred to the application processor 211 via the matching circuit 213 and the NFC transceiver 212 .

As shown in FIG. 16, each of the first inductor L3, the second inductor L4, the third inductor L5, and the fourth inductor L6 may be separately disposed for transmitting and receiving NFC signals. . Since each of the first inductor L3, the second inductor L4, the third inductor L5, and the fourth inductor L6 are separated, the electronic device 200 can improve performance of transmitting and receiving NFC signals. . Although not shown, the antenna 230 may include only the first coil (see FIGS. 12 and 13, 231). The antenna 230 includes a second coil (see FIGS. 12 and 13, 232), a third coil (see FIGS. 12 and 13, 233), and a first coil (231, see FIGS. 12 and 13). 4 coils (see FIGS. 12 and 13, 234) may also be included. That is, in order to improve transmission and reception performance of the antenna 230, the antenna 230 includes a second coil (see FIGS. 12 and 13, 232), a third coil (see FIGS. 12 and 13, 233), and a fourth coil. (See FIGS. 12 and 13, 234) may be further included.

Some of the coils constituting the antenna 230 may be disposed inside the accessory 220 according to an embodiment of the present invention. That is, the second coil 232 , the third coil 233 , or the fourth coil 234 may be disposed inside the accessory 220 . Through this, the degree of freedom of arrangement of the antenna 230 may be increased. The electronic device 200 according to an embodiment of the present invention may support NFC P2P mode, reader mode, and card emulation modes by placing a part of the antenna 230 on the accessory 220 .

Referring again to FIGS. 6 and 1 , unlike the electronic device 100 of FIG. 1 , the electronic device 200 does not require terminals on the mobile device 210 and the accessory 220 . In FIG. 1 , the electronic device 100 may require terminals 114 , 115 , 124 , and 125 to electrically connect the matching circuit 113 and the antenna 130 . In FIG. 6 , in the electronic device 200, some of the coils constituting the antenna 230 may be disposed in the mobile device 210, and the remaining coils constituting the antenna 230 may be disposed in the accessory 220. Since the electromagnetic induction phenomenon occurs between the aforementioned coils, the terminals described above in FIG. 1 may be unnecessary for the electronic device 200 .

17 is a diagram showing a matching circuit according to an embodiment of the present invention by way of example. Referring to FIG. 17 , the matching circuit 213 may include inductors L11 and L12 and capacitors C11, C12, C13 and C14. The inductors L11 and L12 and the capacitors C11, C12, C13 and C14 of the matching circuit 213 are the inductors L7 and L8 and the capacitors C7, C8 and C9 of the matching circuit 113 described above. , C10) and each perform the same function, so the description thereof will be omitted.

18 is a block diagram showing a mobile device according to an embodiment of the present invention by way of example. Referring to FIG. 18 , an electronic device 300 may include a mobile device 310 and an accessory 320 .

The mobile device 310 includes an application processor 311, an NFC transceiver 312, a matching circuit 313, a Hall Sensor Integrated Circuit (IC) 314, a memory 315, a network module 316, and a display driving circuit. (Display Driver IC, DDI, 317), a display module (Display Module, 318), or a CMOS image sensor (CIS, 319). Accessory 320 may include magnet 321 . Since the NFC transceiver 312 and the matching circuit 313 of the mobile device 310 each perform the same role as the NFC transceiver 212 and the matching circuit 213 of the mobile device 210 shown in FIG. 6, A detailed description thereof will be omitted. As described above in FIG. 6, referring to FIG. 18, the antenna 330 may include a plurality of coils. Some coils of antenna 330 may be placed on mobile device 310 and the remaining coils of antenna 330 may be placed on accessory 320 .

A Hall Sensor Integrated Circuit (IC) 314 may be disposed in the mobile device 310 . Hall sensor IC 314 can determine whether accessory 320 is attached to mobile device 310 . For example, the Hall sensor IC 314 may determine whether the accessory 320 is attached to the mobile device 310 through a magnet 321 attached to the accessory 320 . The magnet 321 may be arranged with reference to the location of the Hall sensor IC 314 . Magnet 321 may also allow accessory 320 to attach to mobile device 310 . The hall sensor IC 314 may transfer information about whether the accessory 320 is attached to the application processor 311 .

The application processor 311 may operate the NFC transceiver 312, the matching circuit 313, and the antenna 330 when the accessory 320 is attached with reference to the above information. The application processor 311 may drive a program of the mobile device 310 . For example, the application processor 311 may drive a P2P program, a card emulation program, or a reader program. The application processor 311 may provide an interface (Interface) to the display unit (not shown) of the mobile device 310 so that the user can control the above-described program.

The application processor 311 may not operate the NFC transceiver 312, the matching circuit 313, and the antenna 330 when the accessory 320 is not attached by referring to the above information. The application processor 311 may block the operation of a program that can only be operated when the accessory 320 is attached. Through this, the application processor 311 can prevent unnecessary power consumption.

Instructions or data to be used by the application processor 311 may be stored in the memory 315 . Memory 315 may be implemented in hardware. For example, the memory 315 may include electrically erasable and programmable ROM (EPROM), NAND flash memory, Nor flash memory, phase-change random access memory (PRAM), and resistive random access memory (ReRAM). access memory), ferroelectric random access memory (FeRAM), spin-torque magnetic random access memory (STT-MRAM), or dynamic random access memory (DRAM).

The network module 316 may communicate with external devices. The network module 316 may internally include a receiver and a transmitter (not shown). Illustratively, the network module 44 is CDMA (Code Division Multiple Access), GSM (Global System for Mobile Communication), WCDMA (Wideband CDMA), CDMA-2000, TDMA (Time Division Multiple Access), LTE (Long Term Evolution) ), Worldwide Interoperability for Microwave Access (Wimax), Wireless LAN (WLAN), Ultra Wide Band (UWB), Bluetooth, and Wireless Display (WI-DI).

The display driving circuit 317 may drive the display module 318 . The display driving circuit 317 may process display data transmitted from the application processor 311 and transmit the processed display data to the display module 318 . The display driving circuit 317 may be implemented as an integrated circuit. The display driving circuit 317 may be implemented inside the application processor 311 or may be separately implemented externally.

The display module 318 may display an image. The display module 318 may receive display data from the display driving circuit 317 . The display module 318 may be an organic light emitting display panel, a liquid crystal display panel, a plasma display panel, an electrophoretic display panel, or an electrowetting display panel. A panel (electrosetting display panel) and the like may be included.

The CMOS image sensor 319 may capture external image information in response to control of the application processor 311 . The CMOS image sensor 319 may receive external image information and transmit the received information to the application processor 311 . The application processor 311 may store the received information in the memory 315 .

19 to 30 are diagrams showing application examples of the present invention by way of example. Referring to FIGS. 19 and 20 , an electronic device 400 may include a mobile device 410, an accessory 420, and an antenna 430. For example, the mobile device 410 may be a smart phone, and the accessory 420 may be a cover of the smart phone. The antenna 430 may include a first coil 431 and a second coil 432 . The first coil 431 can be placed on the mobile device 410 and the second coil 432 can be placed on the accessory 420 .

When the accessory 420 is attached to the mobile device 410, an electromagnetic induction phenomenon occurs between the inductor of the first coil 431 and the inductor of the second coil 432 disposed on the mobile device 410 and the accessory 420, respectively. this may occur. The electronic device 400 may transmit and receive NFC signals through electromagnetic induction. Referring to FIG. 19 , each of the first coil 431 and the second coil 432 may be implemented in a rectangular spiral shape. Referring to FIG. 20 , each of the first coil 431 and the second coil 432 may be implemented in a helical shape. The number of turns, width, length, position, and thickness of each of the first coil 431 and the second coil 432 are not limited to those shown in FIGS. 19 and 20 . Also, referring to FIGS. 19 and 20 , there is an area where the coils 431 and 432 overlap. The overlapping regions may be separated through an insulating material. For example, the coil may be disposed in a plurality of layers through vias (not shown), and an insulating material may be disposed between each layer. Referring to FIGS. 19 and 20, the second A capacitor may be further connected to both ends of the coil 432 . A capacitor may be added to the second coil 432 for frequency tuning. Although not shown, when the second coil 432 does not include a capacitor, both ends of the second coil 432 may be directly connected. Although not shown, like the second coil 432, the first coil 431 may further include a capacitor.

Referring to FIGS. 21 and 22 , an electronic device 400 may include a mobile device 410 , an accessory 420 , and an antenna 430 . For example, the mobile device 410 may be a smart phone, and the accessory 420 may be a cover of the smart phone. Compared to FIGS. 19 and 20 , the antenna 430 may further include a third coil 433 . A third coil 433 may be disposed on the accessory 420 .

When the accessory 420 is attached to the mobile device 410, the inductor of the first coil 431, the inductor of the second coil 432, and the third coil disposed on the mobile device 410 and the accessory 420, respectively. An electromagnetic induction phenomenon may occur between the inductors of 433. The electronic device 400 may transmit and receive NFC signals through electromagnetic induction. Referring to FIG. 21 , the third coil 433 may be implemented in a rectangular spiral shape. Referring to FIG. 22 , the third coil 433 may be implemented in a helical shape. The number of turns, width, length, location, and thickness of the third coil 433 are not limited to those shown in FIGS. 21 and 22 .

Referring to FIGS. 21 and 22 , a capacitor may be further connected to both ends of the third coil 433 . A capacitor may be added to the third coil 433 for frequency tuning. Although not shown, when the third coil 433 does not include a capacitor, both ends of the third coil 433 may be directly connected.

23 to 26 , an electronic device 400 may include a mobile device 410, an accessory 420, and an antenna 430. For example, the mobile device 410 may be a smart phone, and the accessory 420 may be a flip cover of the smart phone. Compared to FIGS. 21 and 22 , the antenna 430 may further include a fourth coil 434 . A fourth coil 434 can be disposed on the accessory 420 .

When the accessory 420 is attached to the mobile device 410, the inductor of the first coil 431, the inductor of the second coil 432, and the third coil ( An electromagnetic induction phenomenon may occur between the inductor of the fourth coil 433 and the inductor of the fourth coil 434 . The electronic device 400 may transmit and receive NFC signals through electromagnetic induction. Referring to FIGS. 23 and 25 , the fourth coil 434 may be implemented in a rectangular spiral shape. Referring to FIGS. 23 and 26 , the fourth coil 434 may be implemented in a helical shape. The number of turns, width, length, location, and thickness of the fourth coil 434 are not limited to those shown in FIGS. 23 to 26 . Referring to FIGS. 23 to 26 , there is an area where the third coil 433 overlaps the second coil 432 . The overlapping regions may be separated through an insulating material. For example, the coil may be disposed in a plurality of layers through vias (not shown), and an insulating material may be disposed between each layer.

Referring to FIGS. 23 to 26 , a capacitor may be further connected to both ends of the fourth coil 434 . A capacitor may be added to the fourth coil 434 for frequency tuning. Although not shown, when the fourth coil 434 does not include a capacitor, both ends of the fourth coil 434 may be directly connected. Referring to FIGS. 23 to 26 , the fourth coil 434 may be connected to the third coil 433 . Although not shown, the fourth coil 434 may be disposed separately from the third coil 433 .

Referring to FIGS. 23 and 24 , the second coil 432 and the third coil 433 may be disposed on the back side of the flip cover, and the fourth coil 434 may be disposed on the front side of the flip cover. Referring to FIGS. 25 and 26 , the second coil 432 and the third coil 433 may be disposed on the front surface of the flip cover, and the fourth coil 434 may be disposed on the rear surface of the flip cover.

Referring to FIGS. 19 to 26 , the mobile device 410 is illustrated as a smartphone as an example, but the mobile device 410 is not limited to a smartphone. Although the accessory 420 is illustrated as a cover or flip cover of a smart phone as an example, the accessory 420 is not limited to a smart phone cover or flip cover.

Referring to FIG. 27 , an electronic device 500 may include a mobile device 510 and an accessory 520 . For example, the mobile device 510 may be a smart phone, and the accessory 520 may be a cover of the smart phone. In FIG. 27 , the distance d1 between the mobile device 510 and the accessory 520 is shown. The distance d1 may be appropriately set to use the electromagnetic induction phenomenon between the inductors in each coil. For example, it may be set to 5 mm or less. In addition, a distance (not shown) between the mobile device 510 and each coil disposed inside the accessory 520 may be appropriately set to use the electromagnetic induction phenomenon. For example, it may be set to 10 mm or less.

Referring to FIG. 28 , an electronic device 600 may include a mobile device 610 and an accessory 620 . For example, the mobile device 610 may be a smart phone, and the accessory 620 may be a film or sticker of the smart phone. The accessory 620 may be a film for preventing the mobile device 610 from being scratched or impacted. Accessory 620 may be a sticker to enhance the aesthetics of mobile device 610 .

Referring to FIG. 28 , the accessory 620 may be attached to the rear side of the mobile device 610, not the front side where the screen is displayed. Although not shown in FIG. 28 , the shape of the accessory 620 may be manufactured to be similar to or differently from the shape of the mobile device 610 as in the case of FIG. 28 . Unlike shown in FIG. 28 , the accessory 620 may be attached to the front surface of the mobile device 610 where the screen is displayed. Unlike shown in FIG. 28 , accessory 620 may be attached to the side of mobile device 610 . Also, referring to FIG. 28 , the mobile device 610 is illustratively illustrated as a smart phone, but the mobile device 610 is not limited to a smart phone. Referring to FIG. 28 , the accessory 620 is illustratively shown as a film or sticker of a smartphone, but the accessory 620 is not limited to a film or sticker of a smartphone.

28 shows a distance d1 between mobile device 6510 and accessory 620 . The distance d1 may be appropriately set to use the electromagnetic induction phenomenon between the inductors in each coil. For example, it may be set to 5 mm or less. In addition, a distance (not shown) between the mobile device 610 and each coil disposed inside the accessory 620 may be appropriately set to use the electromagnetic induction phenomenon. For example, it may be set to 10 mm or less.

Referring to FIG. 29 , an electronic device 700 may include a mobile device 710 and an accessory 720 . For example, the mobile device 710 may be a smart phone and the accessory 720 may be a power bank. Referring to FIG. 29 , the mobile device 710 is illustrated as a smartphone as an example, but the mobile device 710 is not limited to a smartphone. Referring to FIG. 29 , the accessory 720 is illustrated as an auxiliary battery, but the accessory 720 is not limited to the auxiliary battery.

In FIG. 29 , the distance d1 between the mobile device 710 and the accessory 720 is shown. The distance d1 may be appropriately set to use the electromagnetic induction phenomenon between the inductors in each coil. For example, it may be set to 5 mm or less. In addition, a distance (not shown) between the mobile device 710 and each coil disposed inside the accessory 720 may be appropriately set to use the electromagnetic induction phenomenon. For example, it may be set to 10 mm or less.

Referring to FIG. 30 , an electronic device 800 may include a mobile device 810 and an accessory 820. For example, mobile device 810 can be a smartphone and accessory 820 can be a smart grip.

Referring to FIG. 30 , accessory 820 can include a portion of antenna 830 . Considering the shape of the smart grip, the shape of the second coil 832 may be a helical shape. Mobile device 810 may include a portion of antenna 830 . Here, considering the electromagnetic induction phenomenon between the inductor of the second coil 832 and the inductor of the first coil 831, the shape of the first coil 831 may be a helical shape. A distance (not shown) between the mobile device 810 and the accessory 820 may be appropriately set to use electromagnetic induction between inductors in each coil. For example, it may be set to 5 mm or less. In addition, a distance (not shown) between the mobile device 810 and each coil disposed inside the accessory 820 may be appropriately set to use the electromagnetic induction phenomenon. For example, it may be set to 10 mm or less.

As described above, application examples of the present invention are exemplarily shown in FIGS. 19 to 30 . Unlike those shown in FIGS. 19 to 30 , the mobile device may be various mobile devices other than a smart phone. For example, it may be a tablet PC, a laptop computer, a digital camera, a smart ring, or a smart watch. In addition, the accessory may be various accessories that can be attached to the mobile device. For example, it may be a cover, film, sticker, non-slip pad, smart grip, auxiliary battery, and the like.

31 is a flowchart exemplarily showing a mobile payment method according to an embodiment of the present invention. Referring to FIG. 31 , the mobile payment method may be executed through an electronic device (see FIG. 18 , 300 ) according to an embodiment of the present invention. The electronic device (see FIG. 18, 300) may be implemented as the application examples shown in FIGS. 19 to 30. 31 will be described with reference to FIGS. 18 and 32 to 35.

In step S100, the electronic device 300 may receive a payment request from the outside through the antenna 330. There can be various ways to receive a payment request. For example, through wired/wireless communication of the network module 316, the electronic device 300 may receive a payment request from the outside. Accessory 320 can then be attached to mobile device 310 . Alternatively, the accessory 320 may be attached to the mobile device 310 in advance.

In step S200, a user interface for performing payment may be executed. At this time, the above-described user interface may be displayed on the display module 318 . When the accessory 320 is attached to the mobile device 310, a user interface for performing payment may be executed by the application processor 311. When the accessory 320 is detached from the mobile device 310, the user interface for performing payment may not be executed. Alternatively, the user interface for performing payment may be executed according to an external payment request regardless of whether the accessory 320 is attached to the mobile device 310 . FIG. 32 is a diagram showing a user interface for performing a payment executed in step S200 shown in FIG. 31 by way of example. However, the user interface executed in step S200 is not limited to that shown in FIG. 32 .

In step S300, the NFC tag may be in contact with the accessory 320. Here, the NFC tag may be a credit card, a transportation card, or another mobile device. NFC tag information may be received by the mobile device 310 through the antenna 330 . For example, the NFC tag information may mean various types of information such as credit card validity information, expiration date, usage amount, or limit amount. The application processor 311 may proceed with payment based on the received information. FIG. 33 is a diagram showing a user interface for contact executed in step S300 shown in FIG. 31 as an example. However, the interface executed in step S300 is not limited to that shown in FIG. 33 .

In step S400, a user interface for completing payment may be executed. A user interface for completing payment may include a screen on which the user of the NFC tag can sign. The user interface for completing payment may include a screen indicating that payment has been completed. 34 and 35 exemplarily show a user interface for completing a payment executed in step S400 shown in FIG. 31 . However, the user interface for payment completion executed in step S400 is not limited to those shown in FIGS. 34 and 35 .

What has been described above are specific examples for carrying out the present invention. The present invention will include not only the above-described embodiments, but also embodiments that can be simply or easily changed in design. In addition, the present invention will also include techniques that can be easily modified and implemented in the future using the above-described embodiments.

100, 200, 300, 400, 500, 600, 700, 800: electronic device
110, 210, 310, 410, 510, 610, 710, 810: mobile device
120, 220, 320, 420, 520, 620, 720, 820: Accessories
111, 211, 311: application processor
112, 212, 312: NFC transceiver
113, 213, 313: matching circuit
130, 230, 330, 430: antenna
131, 231, 431, 831: first coil
132, 232, 432, 832: second coil

Claims (22)

A near field communication (Near Field Communication, hereinafter NFC) antenna including a first coil, a second coil, and a third coil separated from each other; and
Including a mobile device including the first coil,
The second coil and the third coil are disposed outside the mobile device and are electrically separated from the first coil;
The third coil is electrically separated from the second coil and disposed in an enclosed area defined by the second coil. According to claim 1,
The electronic device of claim 1 , wherein the first coil has a rectangular spiral shape or a helical shape, and the second coil has a rectangular spiral shape or a helical shape. According to claim 1,
The second coil is disposed outside the mobile device and is included in an accessory attached to or detached from the mobile device. According to claim 3,
When the accessory is attached to the mobile device, the distance between the first coil and the second coil is within 0 to 10 mm, and an electromagnetic induction phenomenon occurs between the first coil and the second coil. According to claim 1,
The mobile device:
an application processor that provides a data exchange program, a card program, or a card reader program with an external device;
an NFC transceiver for transmitting and receiving NFC signals under the control of the application processor; and
An electronic device comprising a matching circuit connected to the NFC transceiver and the first coil of the antenna. According to claim 5,
The matching circuit is:
an EMC (Electromagnetic Compatibility Filter) filter including inductor elements and capacitor elements; and
An electronic device including capacitor elements for impedance matching between the NFC transceiver and the antenna. According to claim 5,
The electronic device of claim 1 , wherein the mobile device further includes a Hall Sensor Integrated Circuit (IC) disposed outside the mobile device and detecting an accessory attached to or detached from the mobile device. delete According to claim 1,
The electronic device of claim 1 , wherein the first coil has a rectangular spiral shape or a helical shape, the second coil has a rectangular spiral shape or a helical shape, and the third coil has a rectangular spiral shape or a helical shape. According to claim 1,
The third coil is disposed outside the mobile device and included in an accessory attached to or detached from the mobile device. According to claim 10,
An electronic device in which an electromagnetic induction phenomenon occurs between the first coil, the second coil, and the third coil when the accessory is attached to the mobile device. It includes a first coil and a second coil included in a near field communication (hereinafter referred to as NFC) antenna, and is attached to or detached from the mobile device,
The first coil and the second coil are electrically separated from a third coil included in the mobile device,
The accessory of claim 1 , wherein the second coil is electrically separated from the first coil and disposed within an enclosed area defined by the first coil. According to claim 12,
An accessory in which the first coil and the second coil are separated. According to claim 13,
When attached to the mobile device, the distance between the first coil and the second coil is within 0 to 10 mm. According to claim 13,
The NFC antenna further comprises a third coil separated from the first coil and the second coil. A first coil disposed in the mobile device; and
A second coil and a third coil separated from the first coil and disposed outside the mobile device,
The distance between the first coil and the second coil is within 0 to 10 mm,
The second coil and the third coil are electrically separated from the first coil,
The third coil is electrically separated from the second coil and disposed in a closed area defined by the second coil. 17. The method of claim 16,
The second coil is disposed outside the mobile device and included in an accessory attached to or detached from the mobile device. 18. The method of claim 17,
The first coil has a rectangular spiral shape or a helical shape, and the second coil has a rectangular spiral shape or a helical shape. delete 17. The method of claim 16,
The third coil is disposed outside the mobile device and included in an accessory attached to or detached from the mobile device. delete delete

Images