Registered Patent 10-1400623
`
`(19) Korean Intellectual Property Office (KR)
`(12) Publication of Registered Patent (B1)
`
`(45) Publication Date
`(11) Registration No.
`(24) Registration Date
`
`May 29, 2014
`10-1400623
`May 21, 2014
`
`(51)
`
`(21)
`(22)
`
`(56)
`
`10-2012-0141582
`December 7, 2012
`December 7, 2012
`
`International patent classification (Int. Cl.)
`H01Q 7/00 (2006.01)
`
`Application No.
`
`Application date
`Examination request date
`Prior art search documents
`KR1020110130704 A*
`KR1020110035196 A*
`KR100867405 B1*
`*Indicates documents cited by the examiner
`
`
`(73)
`
`
`
`
`(72)
`
`
`
`
`
`
`
`(74)
`
`Patentee
`Kwangwoon University Industry-Academic
`Collaboration Foundation
`20 (Kwangwoon University, Wolgye-dong), Gwangun-ro,
`Nowon-gu, Seoul
`Inventors
`LEE, Byung-Je
`205-702, 42 (Samsung Raemian Apt. Block 2, Banghak-
`dong), Dobong-ro 150-gil, Dobong-gu, Seoul
`KIM, Byeong-Kwan
`207-910, Ssangyong Apt., 19, Dongmangsan-gil, Jongno-gu,
`Seoul
`(Continued on next page)
`Agent
`LEE, Yeo-Song
`
`Total number of claims: Total of 2 claims
`
`Examiner: BYUN, Jong-Gil
`
`(54) Title of Invention NFC ANTENNA HAVING SINGLE-LAYER STRUCTURE
`(57) Abstract
`
`The present invention relates to an NFC antenna having a single-layer structure, and comprises a 13.56 MHz NFC antenna in
`the form of a FPCB (flexible PCB) for providing near field wireless communication within 10 cm composed of an antenna
`feed portion (1) to which the signal of the antenna is applied; an impedance matching portion (2) for matching the inductance
`value (L) and the capacitance value (C) to resonate at the resonance frequency (f = 1/ (2ℼ√LC), c = fλ, provided that, c = 3 x
`108 m/sec) of the 13.56 MHz NFC antenna; a dielectric substrate (3) used as a substrate (cover polymide [sic], ε r = 3.5, 30)
`for covering the pattern of the antenna; an outer 1 turn line portion (4) arranged in the form of a loop at the outer edge of the
`13.56 MHz NFC antenna; an internal branched line portion (5) constituting a branched metal line inside the 13.56 MHz NFC
`antenna; a clearance (6) indicating a gap portion of the empty space between the metal lines; and a branched line end portion
`(7), which is the end point of the branched line for controlling the number of turns of the branched metal line, and is composed
`of a battery (8) for attaching the 13.56 MHz NFC antenna to the battery of a smartphone. In the same manner as a conventional
`loop antenna having a double-layered structure, the 13.56 MHz NFC antenna having a single-layer structure forms a magnetic
`field in a state in which the impedance has been matched with respect to an antenna having an internal branched metal line
`capable of being adjusted to 2 turns to 5 turns in a basic 1 turn loop antenna to generate and operate a magnetic field having
`the same overall performance compared to a conventional NFC antenna having a double-layered structure, and the 13.56 MHz
`NFC antenna having a single-layer structure in the form of an FPCB (Flexible PCB) is applied to the battery (8) of a mobile
`communication terminal (smartphone) or applied to back cases, POS terminals, and other electronic devices to reduce the
`overall thickness of the mobile communication terminal.
`
`Representative figure - Fig. 17
`
`
`
`
`
`
`
`-1-
`
`Page 1 of 55
`
`SAMSUNG EXHIBIT 1011
`
`

`

`Registered Patent 10-1400623
`
`
`
`LEE, Hyun-Woo
`30, Munseong-ro 40-gil (Sillim-dong), Gwanak-gu, Seoul
`
`(72)
`
`Inventors
`WUI, Hyun-Ho
`B-103, Hanjeon Villa, 14, Gwangun-ro 19-gil, Nowon-gu,
`Seoul
`MUN, Byeong-Gwi
`#302, 27, Seokgye-ro 8-ga-gil, Nowon-gu, Seoul
`
`National research and development project supporting this invention
`
`Identification No.
`C0015229
`
`Name of department
`Small- and Medium-sized Enterprise Administration
`
`Name of research project
`Industry-Academic-Research Joint Technology Development Project
`
`Name of research
`Development of NFC antenna and material for mobile terminals to secure a stable recognition region
`
`Contribution ratio
`1/1
`
`Host institution
`Kwangwoon University Industry-Academic Collaboration Foundation
`
`Period of research
`June 1, 2012 to May 31, 2014
`
`
`
`
`
`
`
`-2-
`
`Page 2 of 55
`
`

`

`Registered Patent 10-1400623
`
`Scope of claims
`
`Claim 1
`
`An NFC antenna having a single-layer structure, wherein the NFC antenna having a single-layer structure comprises
`
`an antenna feed portion (1) to which the signal of the antenna is applied;
`
`an impedance matching portion (2) for matching the inductance value (L) and the capacitance value (C) to resonate at the
`resonance frequency (f = 1/ (2ℼ√LC) , c = fλ, provided that, c = 3 x 108 m/sec) of the 13.56 MHz NFC antenna;
`
`a dielectric substrate (3) used as a substrate (cover polymide [sic], ε r = 3.5, 30) for covering the pattern of the antenna;
`
`an outer 1 turn line portion (4) arranged in the form of a loop at the outer edge of the 13.56 MHz NFC antenna;
`
`an internal branched line portion (5) constituting a branched metal line inside the 13.56 MHz NFC antenna;
`
`a clearance (6) indicating a gap portion of the empty space between the metal lines; and
`
`a branched line end portion (7), which is the end point of the branched line for controlling the number of turns of the branched
`metal line,
`
`wherein a 13.56 MHz NFC loop antenna having a single-layer structure is designed and the branched metal line capable of
`controlling the number of turns wound inside the loop having a single-layer structure is inserted to eliminate the jump line
`present in a conventional antenna having a double-layered structure, thereby reducing the thickness of the NFC antenna to
`mitigate the disadvantages of a conventional NFC loop antenna having a double-layered structure.
`
`Claim 2
`
`The NFC antenna having a single-layer structure of claim 1,
`
`wherein the 13.56 MHz NFC antenna having a single-layer structure is capable of changing the inductance value while having
`a constant resistance value through a branched metal line wound inside the basic loop antenna, and forms a magnetic field in
`a state in which the impedance has been matched with respect to the resistance value, inductance value, and quality factor of
`the antenna to be identical to that of the conventional loop antenna having a double-layered structure to generate and operate
`a magnetic field having the same overall performance compared to the conventional NFC antenna having a double-layered
`structure.
`
`Claim 3
`
`Deleted
`
`Claim 4
`
`Deleted
`
`
`
`Specification
`
`Technological field
`
`[0001] The present invention relates to a 13.56 MHz NFC (Near Field Communication) antenna having a single-layer structure,
`and an NFC loop antenna having a single-layer structure is designed and a branched metal line capable of controlling the
`number of turns wound inside the loop having a single-layer structure is inserted to eliminate the jump line present in the
`conventional antenna having a double-layered structure, thereby reducing the thickness of the antenna to mitigate the
`disadvantages of the conventional NFC loop antenna having a double-layered structure, and it can be installed on back cases,
`battery packs, POS terminals, electronic devices. It can also be used for non-contact near field wireless communication as an
`antenna having a structure capable of providing reliability and reduced costs for mass production.
`
`
`
`
`
`
`
`
`
`
`
`
`
`-3-
`
`Page 3 of 55
`
`

`

`Registered Patent 10-1400623
`
`Background art
`
`[0002] NFC is a non-contact, shot-range wireless technology standard that uses 13.56 MHz frequency allowing wireless
`communication between electronic devices with low power at a distance within 10 cm. It was jointly developed in 2002 by
`NXP Semiconductors (based in the Netherlands) and Sony (based in Japan). The speed of transmission is up to 424 kbps. It
`provides excellent security thanks to its proximity characteristics and encryption technology, and terminals can recognize each
`other in less than a tenth of a second without any complicated pairing procedures. NFC is a smart card RFID technology
`enabling contactless wireless communication and it provides bi-directionality compared to other smart cards. Moreover, it has
`a large storage memory space, and a wide range of applicable services. NFC not only provides data communication between
`terminals through convergence with mobile devices, especially smartphones, but it also maintains interoperability with
`conventional non-contact smart card technology and radio frequency identification (RFID).
`
`[0003] Standards related to NFC (ISO/IEC 18092 and ISO/IEC 21481) were established at the NFC Forum. The NFC Forum
`was formed in 2004 with NXP and Sony as key members. The NFC standard is an extension of the ISO/IEC 14443' non-
`contact card standard, and data communication is possible with NFC devices and ISO/IEC 14443 readers or smart cards.
`Recently, a new movement has emerged to introduce NFC technology to smartphones.
`
`[0004] Currently, there is a service model that introduces NFC technology in smartphones using the iOS (Apple) or Android
`(Google) operating systems. The NFC technology is used as a mobile credit card, RFID reader or tag, and data communication
`device. Major credit card companies such as VISA and Mastercard are active supporters of NFC technology. NFC support in
`other smartphone OSs (Google’s Android OS and Nokia’s Symbian OS) is on the rise.
`
`[0005] NFC provides 13.56 MHz band non-contact near field wireless communication technology that allows it to provide
`both data communication between terminals through convergence with mobile devices and interoperability with conventional
`non-contact smart card technology and RFID. It was only after the establishment of the international standard for NFC
`communication (ISO/IEC 18092) in 2003 foundation of the NFC Forum in 2004 that the term “NFC” began to be used officially.
`In the past, most 13.56 MHz wireless communication technologies were included in the category of non-contact smart card
`technology. Conventional non-contact smart card technology is commonly used in credit cards and in transportation cards to
`pay subway and bus fares. NFC technology is used in RFID tags in the fields of distribution and logistics. However, efforts
`continue to be made to break away from fixed-type services like dedicated readers and IC cards and install non-contact wireless
`communication technology in mobile phones. Nokia, the world’s top mobile phone manufacturer, has released some of their
`NFC-equipped mobile phone models. However, NFC’s market expansion was limited because of insufficient service
`connections caused by limited wireless Internet access, limited use of general mobile phones, and the lack of NFC-equipped
`mobile devices.
`
`[0006] It was only after the establishment of the international standard for NFC communication (ISO/IEC 18092) in 2003 and
`the foundation of the NFC Forum in 2004 that the term “NFC” began to be used officially. In the past, most 13.56 MHz wireless
`communication technologies were included in the category of non-contact smart card technology. NFC was established as an
`ISO/IEC 18092 non-contact near field wireless communication standard for the first time in 2004 and defines a communication
`interface and protocol between devices using a magnetic coupling method in the 13.56 MHz band. In Japan, the popular
`technology of FeliCa was partially reflected in the content of ISO/IEC 18092, but FeliCa (FeliCaTM) is Sony’s own wireless
`communication technology for smart cards and was included in the content of a new technological standard called NFC when
`they failed to add the ISO/IEC 14443 type C standardization.
`
`[0007] The NFC standard is an extension of the ISO/IEC 14443' non-contact card standard and can communicate not only with
`NFC devices but also with ISO/IEC 14443 readers or smart cards. NFC is widely used for payment, transmitting product
`information at general stores, travel information to visitors, and transportation and access control lock information. The NFC
`market, which is expected to significantly increase from 2011, is expected to be applied to media-content industries in addition
`to the current industries of finance, transportation, and distribution.
`
`[0008] NFC technology has existed for more than 10 years, and pilot projects continue to be executed to explore future NFC
`technology possibilities. NFC can read and write tag information and is technologically superior to conventional RFID
`technology, which can only read tag information using a reader. Although the data transmission speed is slower than Bluetooth
`transmission speeds, there are advantages to using NFC technology over Bluetooth or infrared technology, which are similar
`technologies, in that the communication setup time is very short at 0.1 seconds and there are fewer recognition errors caused
`by the direction of the sensor. Despite such advantages, the NFC market has quickly grown thanks to global supply pushes to
`integrate this technology. It started to emerge rapidly after Nokia announced in July 2010 that all Nokia smartphones would
`be equipped with NFC from 2011. In November, Verizon, AT&T, and T-Mobile USA (major US mobile carriers), announced
`the establishment of a JV called Isis. Google announced NFC technology as a major function in Gingerbread (Android 2.3
`version unveiled in December), and formed a strategic alliance with the leader of NFC chips, NXP. In February of 2011, it was
`revealed that GSMA, the representative body for mobile carriers, was preparing NFC technology standards for 16 global
`mobile carriers (including SKT and KT). They later announced in March that Verifone, the world’s second largest POS
`company, would introduce NFC into all future POS terminals.
`
`
`
`
`
`-4-
`
`Page 4 of 55
`
`

`

`Registered Patent 10-1400623
`
`[0009] NFC is a non-contact near field wireless communication method using the 13.56 MHz band. It is a technology capable
`of transmitting data between terminals with lower power at a distance of about 10 cm, and it can be said to be a type of RFID
`technology. The difference from a conventional mobile RFID is that it can read and write.
`
`[0010] Under NFC protocol, the NFC device can either be in target or initiator mode. Passive devices are always in target
`mode. For NFC devices, the default mode is the target mode. NFC devices can be switched to initiator mode through an
`application program. When the NFC device is in target mode, the device must wait for the arrival of the RF field generated
`from another initiator. When the device operates in initiator mode, collision avoidance must be performed by detecting an
`external RF field before generating an RF field. The application program decides whether to operate the NFC device in active
`communication mode or in passive communication mode. If the NFC devices operates in passive communication mode, the
`application program performs a single device search before starting data transmission.
`
`[0011] 1.1 Physical layer (RF)
`
`[0012] The communication mode between devices was defined as ISO/IEC 14443 A and FeliCa, the reader/tag mode was
`defined as ISO/IEC 14443 A/B and FeliCa, and the card emulation mode was defined as ISO/IEC 14443 A and FeliCa.
`
`[0013] In terms of RF specification, all NFC communication carrier frequencies use 13.56 MHz and the bandwidth of the
`system is 13.56 MHz 7 kHz [sic: missing -]. The maximum/minimum value of the RF field is Hmax = 7.5 A/m and Hmin = 1.5
`A/m (rms value), and all transponders operate when the strength of the H field is between the maximum and the minimum. All
`readers and active transponders must be capable of generating at least an RF field or more. To avoid a collision, all devices
`must be able to detect RF fields at the minimum field strength or higher.
`
`[0014] 1.2 Link layer
`
`[0015] LLCP (Logical Link Control Protocol) defines a protocol for supporting high-level message data exchange in P2P mode
`and highly reliable bi-directional data transmission for the operation of OBEX and TCP/IP.
`
`[0016] 1.3 Message format
`
`[0017] NDEF (NFC Data Exchange Format) defines the format of data stored in NFC tags. RTD (Record Type Definition)
`additionally defines detailed data for various application fields so that NDEF can be applied to actual applications.
`
`[0018] 1.4 Reader/tag operation
`
`[0019] To support four tag types defined by the NFC Forum, the instruction set for each type is defined separately. Table 1
`shows the classification of NFC tag types.
`
`[0020]
`
`Table 1
`
`Classification
`
`Type 1
`
`Type 2
`
`Type 3
`
`RF interface
`
`ISO 14443 A
`
`ISO 14443 A
`
`ISO 18092
`
`Type 4
`
`ISO 14443
`
`Speed
`
`106 kbps
`
`212 kbps
`
`106 kbps to 424 kbps
`
`Protocol
`
`Its own command
`
`Its own command
`
`FeliCa protocol
`
`Memory size
`
`1 KB or less
`
`2 KB or less
`
`1 MB or less
`
`ISO 14443-4
`ISO 7816-4
`
`64 KB or less
`
`Application field
`
`Low-capacity tag for single application service
`
`Related product
`
`Broadcom
`TopazTM
`
`Sony
`FeliCaTM
`
`High-capacity tag for multiple application
`service
`ISO/IEC 14443 A/B
`compatible product
`
`NXP
`MAFARETM
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`-5-
`
`Page 5 of 55
`
`

`

`Registered Patent 10-1400623
`
`[0021] The NFC Forum classifies the main fields of application of NFC into three categories including device-to-device
`communication (P2P), reader/tag (R/W), and card emulation (SC), and standardizes the technical elements required for each
`operation mode.
`
`[0022] Fig. 1 is a conceptual diagram showing three functions provided by an NFC antenna.
`
`[0023] NFC provides a card emulation function, a reader/tag function, and a device-to-device communication (P2P) function.
`
`[0024] First, the card emulation function refers to the terminal operating as a tag for an external reader and, for example,
`provides a mobile payment function. Through this, various roles, such as mobile credit card, transportation card, membership
`card, and card key, are provided. Second, the reader/tag function refers to the terminal operating as a reader for reading external
`tags and through this, it provides roles such as recognizing tags attached to advertisements to inquire additional information
`or watching trailers through tags attached to movie posters. Third, the P2P function provides a function for allowing two
`terminals to exchange data in a P2P manner in a very simple and quick manner. This makes it easy to share photos, documents,
`and contact information. It is expected that various NFC application services using these three major NFC functions will be
`introduced, and this will provide not only the hardware market for NFC chips and tags but also the application service market
`for mobile payment.
`
`[0025] Table 2 compares and describes the three operating methods of an NFC antenna.
`
`[0026]
`
`NFC operating methods
`
`Table 2
`
`Category
`
`Details
`
`Characteristics
`
`
`
`Card emulation mode
`(Operates like an RFID-
`equipped card)
`A mode in which it can always
`be
`recognized
`through
`a
`payment machine
`(reader)
`regardless of whether
`the
`terminal is ON/OFF
`Passive mode: A mode in which
`the NFC initiator supplies an RF
`field to provide power required
`for
`exchanging
`data,
`and
`provides a power saving effect
`
`
`Reader/writer mode
`(Operates as a card reader)
`
`A mode in which the RFID tag
`information is recognized in an
`NFC-activated state and
`the
`mobile phone operates as a card
`reader
`
`Requires power for recognizing
`the RFID tag
`
`P2P mode
`(Device-to-device
`communication mode)
`
`A mode in which two NFC
`mobile phones operate as card
`readers, allowing data to be
`transmitted between each other
`
`An active mode that consumes a
`great deal of power since it
`needs
`to
`generate
`an
`independent RF field for data
`transmission
`
`[0027] A microprocessor, an encryption processing circuit, a random number generator and non-volatile memory are integrated
`in a large-scale integration for secure elements equipped in NFC. It is possible to receive application software from the outside
`and operate it as various types of non-contact IC cards. The SE for NFC-equipped mobile phones can run multiple applications.
`The secure elements in the payment service prevent intrusions from malicious third parties or information theft. In SE, data is
`transmitted in a state of being encrypted with a secret key known only to the service provider. Conversely, when storing, it is
`received in a state of being encrypted with a secret key inside the SE. Through this, even the owner of the mobile phone cannot,
`for example, change or see the information entered into the SE. In other words, securing the secure element means that the
`person will have the same status as Apple running the App Store or Google developing the Android market in the NFC service
`area. In addition, the requirements of the mobile phone required according to the mounting location of the SE are different.
`Therefore, manufacturers of NFC-equipped mobile phones have a heavy burden. This is because SE LSI and NFC controller
`IC are mounted as separate chips, thus each service entity must consider the internal design. Therefore, the semiconductor
`industry is planning to integrate NFC controller IC and SE LSI into one chip. This integrated LSI provides the interface of the
`SWP for SIM cards with built-in SE. Because the circuit size of SE itself is not large, even if it is integrated, NFC controller
`IC single-body products can be provided at almost the same cost. When NFC-equipped mobile phones become mainstream,
`businesses that provide NFC services with SD memory cards can mount the SE on the SD memory card. This is because the
`antenna of the main body of the mobile phone and the NFC controller IC can be used. It is connected through the baseband
`processing LSI between the NFC controller IC and the SE of the SD memory card. It is connected by an SDIO between the
`SD memory card and the baseband processing LSI and connected by a standard interface, such as SPI (serial peripheral
`interface), between the baseband processing LSI and the NFC controller IC.
`
`[0028] Fig. 2 is a figure showing a 13.56 MHz band interface standard.
`
`
`
`
`
`
`
`-6-
`
`Page 6 of 55
`
`

`

`Registered Patent 10-1400623
`
`[0029] NFC was established as an ISO/IEC 18092 standard for the first time in 2004 and is clearly differentiated from the
`conventional non-contact smart card technology in terms of defining a device-to-device communication interface and protocol
`in a magnetic coupling method in the 13.56 MHz band. The technology of FeliCaTM, which is widely used in Japan, was
`partially reflected in the content of ISO/IEC 18092, but FeliCaTM is Sony’s own wireless communication technology for smart
`cards and was included in the content of a new technological standard called NFC when they failed to add the ISO/IEC 14443
`type C standardization. In addition, in 2005, three representative 13.56 MHz band non-contact technology elements, such as
`ISO/IEC 14443, ISO/IEC 15693, and ISO/IEC 18025, were included in the category of NFC through the ISO/IEC 21481
`standard, and this was a strategy for the expansion of supply and spread of application service field of NFC. 13.56 MHz band
`non-contact near field wireless communication can be classified into proximity type for within 10 cm and vicinity type capable
`of recognizing up to the range of 1 m depending on the range of communication. Of these, non-contact near field wireless
`communication technology is applied to smart cards, and ISO/IEC 14443 is a representative standard. It was found that the
`most widely used ISO/IEC 14443-based IC chip is NXP’s MIFARE, which was found to occupy 72% of the global market
`share (in 2007). The ISO/IEC 15693 standard is a technology that is mainly used for smart labels such as, access cards and air
`cargo recognition, because it can be recognized wirelessly within the range of 1 m. EPC Global, which is leading the
`standardization of barcode and 900 MHz band RFID technology specialized in the distribution and logistics field, is in the
`process of standardizing the HF band based on ISO/IEC 15693.
`
`[0030] The specification for NFC is provided by ISO/IEC 18092 or ECMA-340. ISO/IEC 18092 specifies an active
`communication mode and a passive communication mode. Test regulations concerning the RF interface are defined in ECMA-
`356 and the protocol test is defined in ECMA-362.
`
`[0031] Fig. 3 is a diagram showing three operation modes of an NFC Forum Device.
`
`[0032] All active and passive devices complying with NFC regulations support three communication rates of 106 kbps, 212
`kbps, and 424 kbps, and when the bit rate is set in the initiator, communication is performed at that rate.
`
`[0033] Table 3 shows a comparison among non-contact standard wireless communications technology at 13.56 MHz.
`
`[0034]
`
`Category
`
`Operation
`mode
`Power supply
`Communication
`range
`Data rate
`
`Application
`field
`
`NFC standard
`ISO/IEC 18092
`Device-to-device
`communication
`Active and passive
`
`10 cm
`
`106 kbps
`Smart cards
`(Transportation cards, credit
`cards)
`Comparison among non-contact standard wireless communications technology at 13.56 MHz
`
`106 kbps, 212 kbps, 424 kbps
`
`Mobile devices
`
`Table 3
`
`Non-contact smart card standard
`ISO/IEC 14443
`ISO/IEC 15693
`
`Reader/card
`
`Reader/card
`
`Passive
`
`10 cm
`
`Passive
`
`1 m
`
`26 kbps
`Smart label
`(Access cards, product
`recognition)
`
`
`
`[0035] However, recent attempts to use NFC technology in smart phones and utilize as mobile credit cards, RFID readers/tags,
`and data transmission devices, are emerging as a considerably realistic service model. In particular, major credit card
`companies, such as VISA and Mastercard, are very actively supporting the adoption of NFC technology, and NFC support in
`smartphone OSs, such as Google’s Android and Nokia’s Symbian OS, is also gradually increasing.
`
`[0036] The NFC antenna communicates through inductive coupling in a short range. In the ISO/IEC 18092 standard, the NFC
`reader antenna operates in a magnetic field corresponding to 1.5 A/m < |H| < 7.5 A/m. In the case of a reader antenna, one of
`the most important details is increasing the distance of recognition while satisfying this condition. In addition, the NFC antenna
`is forcibly matched to 13.56 MHz through a matching circuit.
`
`[0037] However, the conventional double-layered NFC antenna structure has a problem in that the height (thickness) of the
`antenna increases due to the limited design for the cross-sectional structure for the power feed portion in the structure of the
`loop antenna and has problems in that it has a complicated process and disconnection occurs.
`
`
`
`
`
`
`
`
`
`-7-
`
`Page 7 of 55
`
`

`

`Registered Patent 10-1400623
`
`Details of the invention
`
`Problem to be solved
`
`[0038] Current smartphones require the NFC function as an essential feature. Smartphones are becoming increasingly thin.
`Therefore, also in the case of the 13.56 MHz NFC antenna mounted on the mobile phone, there is an urgent need to improve
`the reliability of mass production and reduce production costs while reducing the thickness. It is crucial to invent an NFC
`antenna having a single layer capable of decreasing the thickness, improving the reliability, and reducing mass production cost,
`which are the disadvantages of the conventional 13.56 MHz NFC antenna having a double-layered structure.
`
`[0039] The object of the present invention for solving the problems of the conventional 13.56 MHz NFC antenna having a
`double-layered structure is to provide a single-layer NFC antenna installed in the back case or battery pack of mobile phones,
`POS terminals, and other electronic devices to provide non-contact, near field wireless communication at a distance within 10
`cm. By designing an NFC antenna having a single-layer structure that can be manufactured in one layer that can reduce the
`thickness of the NFC antenna and reduce the cost of mass production and inserting an additional element that can control the
`number of turns of a branched metal line (Cu, copper) inside the loop of a single-layer structure to generate the same magnetic
`field as that of the conventional antenna through a baranched [sic: branched] metal line that is wound inside without the need
`for a jump wire to be able to replace the conventional antenna having a double-layered structure.
`
`
`
`Means for solving problems
`
`[0040] To achieve that object of the present invention, the NFC antenna having a single-layer structure comprises a 13.56 MHz
`NFC antenna in the form of a FPCB (flexible PCB) for providing near field wireless communication within 10 cm composed
`of an antenna feed portion (1) to which the signal of the antenna is applied; an impedance matching portion (2) for matching
`the inductance value (L) and the capacitance value (C) to resonate at the resonance frequency (f = 1/ (2ℼ√LC), c = fλ, provided
`that, c = 3 x 108 m/sec) of the 13.56 MHz NFC antenna; a dielectric substrate (3) used as a substrate (cover polymide [sic], ε r
`= 3.5, 30) to cover the pattern of the antenna; an outer 1 turn line portion (4) arranged in the form of a loop at the outer edge
`of the 13.56 MHz NFC antenna; an internal branched line portion (5) constituting a branched metal line made of copper (Cu,
`copper foil) inside the 13.56 MHz NFC antenna; a clearance (6) indicating a gap portion of the empty space between the copper
`(Cu, copper foil) metal lines; and a branched line end portion (7), which is the end point of the branched line for controlling
`the number of turns of the branched metal line, and to mitigate the disadvantages of the conventional NFC loop antenna having
`a double-layered structure, the thickness of the NFC antenna is reduced by designing a 13.56 MHz NFC antenna having a
`single-layer structure and inserting a branched metal line capable of controlling the number of turns wound inside the loop
`having a single-layer structure to eliminate the jump line of the conventional antenna having a double-layered structure.
`
`
`
`Effect of invention
`
`[0041] The 13.56 MHz NFC antenna having a single-layer structure according to the present invention provides an NFC
`antenna having a single-layer structure without a jump line by designing a 13.56 MHz NFC antenna that can be manufactured
`in one layer having a single-layer structure and inserting an additional element that can control the number of turns of a
`branched metal line (Cu, copper) inside to generate the same magnetic field as that of the conventional antenna through a
`baranched [sic: branched] metal line that is wound inside without the need for a jump wire to be able to replace the conventional
`antenna having a double-layered structure with a jump line.
`
`[0042] Therefore, the 13.56 MHz NFC antenna having a single-layer structure of the present invention can increase the
`recognition distance of a system communicating at a short distance by exciting the current flow in the same direction through
`the baranched [sic: branched] metal line inside. This results in a stronger magnetic field within the close range.
`
`[0043] The 13.56 MHz NFC antenna having a single-layer structure of the present invention, unlike the conventional antenna,
`is an antenna that can be designed and manufactured in a single-layer structure and can minimize the flaws in the processes
`and minimize the height of the antenna. In addition, it can be applied equally to a general sintered body or polymer-type ferrite.
`The 13.56 MHz NFC antenna having a single-layer structure is in the form of a structure having a feed portion for the matal
`[sic: metal] line (4) in the form of a loop at the outer edge of the designed pattern and having a clearance (gap) for a branched
`metal line (5) wound inward from the outer metal line. In the 13.56 MHz NFC antenna of the present invention, the branched
`metal line inside can control the number of turns of the NFC antenna and change the inductance value of the antenna by the
`number of turns. Unlike the conventional antenna, it has a relatively constant resitance [sic: resistance] value with respect to
`the industance [sic: inductance] value that increases as the number of turns of the branched metal line increases and generates
`the same magnetic field as the conventional NFC antenna having a double-layered structure through a baranched [sic: branched]
`metal line wound inward from the antenna.
`
`
`
`
`
`-8-
`
`Page 8 of 55
`
`

`

`Registered Patent 10-1400623
`
`[0044] The antenna of the 13.56 MHz NFC system for near field wireless communication within 10 cm may be applied to the
`battery of a mobile communication terminal (mobile phones and smartphones) or the back case of a mobile communicati