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`a2) United States Patent
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`US 10,461,426 B2
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`Oct. 29, 2019
`(45) Date of Patent:
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`US010461426B2
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`Notice:
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`CN
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`2014/0210406 Al
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`2015/0054455 Al
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`References Cited
`U.S. PATENT DOCUMENTS
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`7/2014 Na et al.
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`2/2015 Kim etal.
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`(Continued)
`FOREIGN PATENT DOCUMENTS
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`103165971 A
`6/2013
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`9/2013
`103326473 A
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`(Continued)
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`OTHER PUBLICATIONS
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`(54) WIRELESS ANTENNA FOR WIRELESS
`CHARGING AND NFC COMMUNICATION
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`AND WIRELESS TERMINAL TO WHICH
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`SAME IS APPLIED
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`Applicant: LG INNOTEK CO., LTD., Seoul (KR)
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`Inventor: Sung Hyun Leem, Seoul (KR)
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`Assignee: LG INNOTEK CO., LTD., Seoul (KR)
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`Subject to any disclaimer, the term ofthis
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`patent is extended or adjusted under 35
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`U.S.C. 154(b) by 0 days.
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`Appl. No.: 16/011,282
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`Filed:
`Jun. 18, 2018
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`Lucic, “Google’s Nexus 6 Gets Torn Apart by iFixit, Here’s a Look
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`Inside”, Android Headlines, https://www.androidheadlines.com/
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`2014/11/googles-nexus-6-gets-torn-apast-by-ifixit-heres-a-look-inside.
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`html, Nov. 24, 2014, pp. 1-7.
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`Prior Publication Data
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`(Continued)
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`US 2018/0301786 Al
`Oct. 18, 2018
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`Primary Examiner — Robert Karacsony
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`Related U.S. Application Data
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`(74) Attorney, Agent, or Firm — Birch, Stewart, Kolasch
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`& Birch, LLP
`Continuation of application No. 15/742,409, filed as
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`application No. PCT/KR2016/007303 on Jul. 6, 2016.
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`ABSTRACT
`(57)
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`Foreign Application Priority Data
`(30)
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`A wireless antenna including a wireless communication
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`antenna includingafirst wireless communication coil and a
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`Jul. 6, 2015)
`(KR) oe 10-2015-0096051
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`second wireless communication coil; and a wireless charg-
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`ing antenna including a wireless charging coil. In addition,
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`Int. Cl.
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`the wireless charging coil is disposedinside thefirst wireless
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`(2006.01)
`HO1O 7/00
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`communication coil, and the second wireless communica-
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`(2006.01)
`HOIO 138
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`tion coil is disposed inside the wireless charging coil; the
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`(Continued)
`wireless communication antenna further includes a coil
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`(52) U.S. Cl.
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`connection membertraversing the wireless charging coil so
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`as to interconnect the first wireless communication coil and
`CPC vice HO01Q 7/00 (2013.01); HOIQ 1/22
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`(2013.01); HO1Q 1/24 (2013.01); HOIQ 1/38
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`the second wireless communication coil; and a number of
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`(2013.01); H04B 5/00 (2013.01)
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`windings of the second wireless communication coil is less
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`(58) Field of Classification Search
`than a number of windings ofthe first wireless communi-
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`CPC wee HO1Q 1/24; HO1Q 1/521; H01Q 7/00;
`cation coil.
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`H01Q 7/06; H04B 5/0025; HO4B 5/0031;
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`(Continued)
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`55 Claims, 7 Drawing Sheets
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`3/2018
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`9/2014
`104040835 A
`CN
`Int. Cl.
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`1/2015
`104321928 A
`CN
`(2006.01)
`HO4B 5/00
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`2/2015
`104364968 A
`CN
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`Coven
`Hg eu
`CN
`204289689 U
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`11/2014
`2804290 Al
`EP
`(2006.01)
`010
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`2830152 Al
`EP
`(58) Field of Classification Search
`1/2015
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`10-2013-0015618 A
`KR
`CPC.... H04B 5/0037; H04B 5/005; HO4B 5/0075;
`2/2013
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`10-2013-0039659 A
`KR
`H04B 5/0081; HO4B 5/0087; H04B
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`5/2013
`10-2013-0045306 A
`KR
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`5/2014
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`KR
`See application file for complete search history.
`5/2014
`10-2014-0056606 A
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`“«
`hej
`:
`:
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`Lee et al, Multi functional high-isolation dual antenna for control
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`lable wireless charging and NFC communication,” Electronic Let-
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`ters, vol. 50, No. 13, Jun. 19, 2014, pp. 912-913.
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`* cited by examiner
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`FOREIGN PATENT DOCUMENTS
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`FIG.4
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`ee2 Turn
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`R VALUE(Q)
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`we 0 Turn
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`FIG. 5
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`SRD precrertrrererterertnrereanemarmaeemerae
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`30.80
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`25.00
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`Qvatue 20.00
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`etn
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`2 Turn
`2 Tarn
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`~~~ -fm---
`— —-~
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`1
`WIRELESS ANTENNA FOR WIRELESS
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`CHARGING AND NFC COMMUNICATION
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`AND WIRELESS TERMINAL TO WHICH
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`SAME IS APPLIED
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`CROSS-REFERENCE TO RELATED
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`APPLICATIONS
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`This Application is a Continuation of co-pending appli-
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`cation Ser. No. 15/742,409, filed on Jan. 5, 2018, which is
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`the National Phase of PCT International Application No.
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`PCT/KR2016/007303filed on Jul. 6, 2016, which claims the
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`benefit under 35 U.S.C. § 119(a) to Korean Patent Applica-
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`tion No. 10-2015-0096051 filed on Jul. 6, 2015, all of which
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`are hereby expressly incorporated by reference into the
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`present application.
`BACKGROUND OF THE INVENTION
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`Field
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`tional loop antenna having an NFC function, and a wireless
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`terminal to which the sameis applied.
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`According to one embodimentof this disclosure, there is
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`provided a wireless antenna including a near field commu-
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`nication (NFC)antenna including a first coil member and a
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`second coil member each including at least one first loop
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`pattern, and a charging antenna including an induction coil
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`memberincluding at least one second loop pattern formed
`between the first coil member and the second coil member
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`and a coil periphery member configured to form an inner
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`periphery of the induction coil member.
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`The NFC antenna may further include a coil connection
`member connected to one side of an inner surface ofthe first
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`coil memberandto oneside of an outer surface of the second
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`The second coil member may include inner turns, a
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`number of which is determined within a range satisfying a
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`resistance (R) value or a quality factor (Q) value, which is
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`defined in standards of a Wireless Power Consortium (WPC)
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`and a Power Matters Alliance (PMA).
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`The second coil member may include one inner turn.
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`The second coil member and the coil periphery member
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`may have a distance therebetween, which is determined
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`within a range satisfying the R value or the Q value.
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`The R value may range from 4Q to 6Q, and the Q value
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`may range from 23 to 27.
`The distance between the second coil memberandthe coil
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`periphery member may range from 40 ym to 70 um.
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`The NFC antenna mayfurther include a first longitudinal
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`end of thefirst coil member configured to extend from one
`side of the inner surface of thefirst coil member.
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`The second coil member may be formedso that a second
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`longitudinal end terminal formed on a longitudinal end of
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`the first loop pattern thereof is in electrical contact with the
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`longitudinal end terminal.
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`Eachofthe first loop pattern and the second loop pattern
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`may be formedasa spiral loop pattern.
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`According to another embodimentofthis disclosure, there
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`is provided a wireless terminal including a wireless antenna
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`configured to simultaneously support wireless charging and
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`near field communication (NFC), a flexible printed circuit
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`board (FPCB) on which the wireless antenna is mounted, a
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`battery configured to store therein electric power generated
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`in the wireless antenna, and an NFC chip configured to
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`supply electric power to the NFC antenna so as to transmit
`and receive communication data to and from the NFC
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`antenna.
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`Eachofthe first loop pattern and the second loop pattern
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`may be formedasa spiral loop pattern.
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`The wireless antenna maybe bent soas to be divided and
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`formed on twosurfaces of the flexible printed circuit board.
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`As described above,
`in the embodiments, a first coil
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`member and a second coil member, which support near field
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`communication (NFC), are formed inside and outside of an
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`induction coil member, which supports wireless charging,
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`and are connected to each other, whereby wireless charging
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`may be achieved and increased NFC recognition efficiency
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`maybe achieved.
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`In addition, when the distance between the second coil
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`member and a coil periphery memberis determined or the
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`number of inner turns of the second coil memberis opti-
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`mally determined within a range satisfying a resistance (R)
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`value or a quality factor (Q) value defined in standards of the
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`WPC and the PMA,interference therebetween may be
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`suppressed.
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`25
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`This disclosure relates to a wireless antenna, and more
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`particularly, to a wireless antenna capable of simultaneously
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`supporting wireless charging and near field communication
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`(NFC) anda wireless terminal to which the sameis applied.
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`Discussion of the Background Art
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`Due to the development of mobile communication and
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`information processing technologies, smart phones provide
`various wireless Internet services such as content services as
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`well as video telephony. Such smart phones use near-field
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`communication (NFC)technology to provide the aforemen-
`tioned services.
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`NFC technology is non-contact near-field wireless com-
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`munication using a frequency band of 13.56 MHz andis a
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`communication technology that transmits data bidirection-
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`ally between terminals within a distance of 10 cm orless.
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`Moreover, design technologies for wireless antennas are
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`evolving such that, in recent smart phones, a loop antenna
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`having a wireless charging function and a loop antenna
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`having the above-mentioned NFC function are provided
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`together in order to enhance user convenience.
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`Wireless charging is non-contact charging in which charg-
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`ing is achieved simply by placing a smartphone on or near
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`a charger. As a wireless charging method, a magnetic-
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`induction method, a magnetic-resonance method, and an
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`electromagnetic-wave method may be mentioned, and
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`among these, the magnetic-induction method has recently
`attracted attention.
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`However, in the related art, since a very small smartphone
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`has had to be provided with a loop antenna that supports
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`magnetic induction wireless charging and a loop antenna
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`that supports NFC, charging efficiency may be reduced or
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`NFC recognition efficiency may be deteriorated due to
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`interference between the two loop antennas.
`SUMMARY
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`To overcome the problem described above, one object of
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`this disclosure is to provide a wireless antenna designed
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`such that a loop antenna that supports an NFC function is
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`addedinside a loop antenna that supports wireless charging,
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`and a wireless terminal to which the sameis applied.
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`In addition, another object of this disclosure is to provide
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`a wireless antenna designed by optimizing the distance
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`between a loop antenna for wireless charging and an addi-
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`Page 10 of 15
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`US 10,461,426 B2
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`Accordingly, when interference is suppressed, this may
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`result in an increase in wireless charging efficiency and NFC
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`recognition efficiency.
`BRIEF DESCRIPTION OF THE DRAWINGS
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`FIGS. 1 and 2 are cross-sectional views respectively
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`illustrating an example of the antennastructure of a wireless
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`antenna according to an embodiment.
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`FIG.3 is a cross-sectional view illustrating the connection
`structure of the wireless antennaillustrated in FIG. 1.
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`FIG.4 is a graph illustrating the R value compared with
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`the inner turn interval depending on the number of inner
`turns of FIGS. 1 and 2.
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`FIG. 5 is a graph illustrating the comparison result
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`between the Q value and the inner turn interval of FIGS. 1
`and 2.
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`FIG. 6 is a schematic view illustrating one example of a
`wireless terminal to which the wireless antenna of FIG. 1 is
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`applied.
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`FIG.7 is a schematic view illustrating another example of
`a wireless terminal to which the wireless antenna of FIG. 1
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`is applied.
`DETAILED DESCRIPTION OF THE
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`EMBODIMENTS
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`Terms described below in this specification are merely
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`used to describe specific embodiments, and the embodi-
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`ments should not be limited by these terms. For example, the
`terms “first coil member” and “second coil member” are
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`used to distinguish one element from another element.
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`Moreover, the term “and/or” used in this specification
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`should be understood as including any arbitrary and all
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`possible combinations of one or more of the associatedlisted
`items.
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`Hereinafter,
`embodiments disclosed herein will be
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`described in detail with reference to the accompanying
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`drawings, and the same reference numbers will be used
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`throughout the drawings to refer to the sameorlike parts,
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`and a repeated description thereof will be omitted.
`<Embodiment of Wireless Antenna>
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`FIGS. 1 and 2 are cross-sectional views respectively
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`illustrating an example of the antennastructure of a wireless
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`antenna according to an embodiment.
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`Asillustrated, the wireless antenna 100 according to an
`embodiment includes an NFC antenna 110 for near field
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`communication (NFC) and a charging antenna 120 for
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`wireless charging in connection with a coil of the NFC
`antenna 110.
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`The NFC antenna 110 includes a first coil member 111,
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`which includesat least one first loop pattern 111 for NFC,
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`and a second coil member 112, which is formed inside the
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`first coil member 111 and includes at least one first loop
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`pattern 112 in the same mannerasthe first coil member 111.
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`The first loop pattern has a structure in which several
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`spiral patterns are wound in close contact with each other.
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`For example, thefirst loop pattern of the first coil member
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`111 may include substantially rectangular spiral patterns,
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`and the first loop pattern of the second coil member 112 may
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`include substantially circular spiral patterns.
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`In conclusion,
`the first
`loop pattern of the first coil
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`member 111 and the first loop pattern of the second coil
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`member 112 may have the samespiral pattern structure, but
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`may differ from each other in terms of the shape thereof.
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`However, the disclosure is not limited thereto, and various
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`modifications, for example, one in which both loop patterns
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`have the same shape, are possible.
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`Here,thefirst loop pattern of the second coil member 112
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`maybe limited as to the numberofspiral patterns, unlike the
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`first loop pattern of the first coil member 111.
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`This is because it is necessary to satisfy a resistance (R)
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`value and/or a quality factor (Q) value, which are defined in
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`standards of the Wireless Power Consortium (WPC)and/or
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`the Power Matters Alliance (PMA).
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`In general, the R value is defined within a range from 4Q
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`to 6Q, and the Q value is defined within a range from 23.00
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`to 27.00, as recommended in the standards of the WPC
`and/or the PMA.
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`Since efficiency may be deteriorated in terms of wireless
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`charging and/or NFC recognition outside the ranges
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`described above, the standards of the WPC and/or the PMA
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`define the ranges as described above.
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`Thus,the first loop pattern of the second coil member 112
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`may be determined so that the numberof spiral patterns is
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`within both the ranges of the R value and/or the Q value
`described above.
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`For example, whenthefirst loop pattern of the secondcoil
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`member 112 includes one inner turn (‘“turn” means the
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`numberof timesthe coil is wound), this may be the optimum
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`numberin terms of wireless charging efficiency and/or NFC
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`recognition efficiency.
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`In other words, when the first loop pattern of the second
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`coil member 112 includes one innerturn, it may satisfy the
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`R value and/or the Q value, thereby enhancing wireless
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`charging efficiency and/or NFC recognition efficiency.
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`Meanwhile, an example of one innerturn is illustrated in
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`FIG. 1, and an example of two inner turnsis illustrated in
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`FIG. 2. As noted above, one inner turn in FIG.1 is superior
`to two inner turns in FIG. 2 in terms of the effect thereof.
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`On the other hand,
`in an embodiment,
`the charging
`antenna 120 is formed betweenthefirst coil member 111 and
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`the second coil member 112 of the NFC antenna 110, in
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`order to satisfy both antenna standards, which are recom-
`mended in the standards of the WPC and the PMA.
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`To this end, the charging antenna 120 may include an
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`induction coil member 121, which includes at least one
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`second loop pattern, and a coil periphery member 122,
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`which forms the inner periphery of the induction coil
`member121.
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`The second loop pattern has a structure in which several
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`spiral patterns are wound in close contact with each other.
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`For example, the second loop pattern of the induction coil
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`member 121 may include substantially circular spiral pat-
`terns.
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`The coil periphery member 122 may havea size sufficient
`to cover the bottom of the induction coil member 121 so as
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`to be larger than the inner circle and the outer circle when
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`the induction coil member 121 hasa circular shape.
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`For example, the coil periphery member 122 may form
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`the outer periphery, which protrudes outwards from the
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`circular induction coil member 121, and may also form the
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`inner periphery, which protrudes inwards from the circular
`induction coil member 121.
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`Next, the NFC antenna 110 according to an embodiment
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`may further include a coil connection member 113, which
`connects one side of the inner surface of the first coil
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`member 111 and oneside of the outer surface of the second
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`coil member 112 to each other. As shown in FIG. 1, a width
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`of a winding of the second coil member 112 is less than a
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`width of a windingofthe first coil member 111, and each of
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`the windingsofthe first coil member 111 has a width greater
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`than the width of the winding of the second wireless
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`US 10,461,426 B2
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`20
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`communication coil (e.g., the various dimensionsare readily
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`seen at the center left of FIG. 1, where the connection
`member 113 connects betweenthe first coil member 111 and
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`the second coil member 112).
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`Through the connection using the coil connection member
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`113 as described above, the first coil member 111 and the
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`second coil member 112 maybeelectrically connected to
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`each other so as to further activate the interchange of
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`magnetic fields between the first coil member 111,
`the
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`second coil member 112, and the induction coil member
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`121, which may increase NFC recognition efficiency and
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`charging efficiency.
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`Moreover, in order to further increase NFC recognition
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`efficiency and charging efficiency, the distance L between
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`the second coil member 112 and the inner periphery of the
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`coil periphery member 122 (hereinafter also referred to as an
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`inner turn interval) may be determined within the range
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`satisfying the resistance (R) value and/or the quality factor
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`(Q) value, which are defined in the standards of the WPC
`and/or the PMA.
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`For example, when the R value, recommended in the
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`standards of the WPC and/or the PMA, ranges from 4Q to
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`6Q, or when the Q value, recommendedin the standards of
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`the WPC and/or the PMA, ranges from 23.00 to 27.00, the
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`distance L may range from 40 um to 70 um to satisfy the R
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`value or the Q value.
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`The suitability therefor will be sufficiently described later
`with reference to FIGS. 4 and 5.
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`<Embodiment of Connection Structure>
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`FIG.3 is a cross-sectional view illustrating the connection
`structure of the wireless antenna illustrated in FIG. 1.
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`Reference numerals illustrated in FIG. 3 designate the same
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`structure including the above-described reference numerals
`of FIG. 1.
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`Referring to FIG.3, the wireless antenna 100 according to
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`an embodiment may include the connection structure of the
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`NFCantenna 110 and the connection structure of the charg-
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`ing antenna 120.
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`With regard to the connection structure of the NFC
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`antenna 110, the first coil member 111 may further include
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`a longitudinal end terminal 114, which extends from one
`side of the inner surface of the first coil member 111 and
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`formsa first longitudinal end ofthe first coil member, and
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`the second coil member 112 mayfurther include a second
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`longitudinal end terminal 115, which is wound by the
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`numberof inner turns and is formed on the longitudinal end
`of the second coil member.
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`The longitudinal end terminal 114 may be spaced apart
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`from the second coil member 112, but may extend from the
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`inner side of the first coil member 111, rather than being
`connected to one side of the inner surface of the first coil
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`member 111 and to one side of the outer surface of the
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`second coil member 112.
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`In this case, the second longitudinal end terminal 115 may
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`be in electrical contact with the longitudinal end terminal
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`114. This contact structure may contribute to an increase in
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`NFCrecognition efficiency and charging efficiency.
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`In addition, the connection structure of the NFC antenna
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`110 may further include an inner connection terminal 116,
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`which is formed on the other inner longitudinal end of the
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`last spiral pattern ofthe first loop pattern formed on the inner
`surface of the first coil member 111.
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`The connection terminal 116 may bein electrical contact
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`with a connection terminal 117, which is formed on the outer
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`longitudinal end ofthe first coil member 111.
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`In an embodiment, the connection structure of the charg-
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`ing antenna 120 may further include a connection terminal
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`6
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`123, which is in electrical contact with a battery, in order to
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`transmit electric power, which is generated via the magnetic-
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`induction-type magnetic field between the NFC antenna 110
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`and the charging antenna 120, to the battery.
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`The connection terminal 123 of the charging antenna 120
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`may be formedin the direction in which it crosses the second
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`loop pattern having a spiral shape.
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`However, the disclosure is not limited thereto, and the
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`charging antenna may be positioned in various ways
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`depending on the innerstructure of an object on which the
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`wireless antenna 100 is mounted (e.g. a mobile terminal, a
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`wearable device, or the like). Moreover, needless to say, the
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`connection structure of the NFC antenna 110 may have
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`various other contact structures depending on the inner
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`structure or shape of the object.
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`Meanwhile, the wireless antenna 100 described above
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`may be formed (printed) on a flexible printed circuit board
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`101. In this case, each connection structure of the wireless
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`antenna 100 maybe electrically connected to a connector
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`102, which is formed on the flexible printed circuit board
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`101. The connector 102 maybeelectrically connected to, for
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`example, an NFC chip, which is provided inside the object.
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`Comparative Example 1
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`FIG.4 is a graph illustrating the R value compared with
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`the inner turn interval depending on the numberof inner
`turns of FIGS. 1 and 2.
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`Referring to FIG. 4, when the number of inner turns is
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`zero, the R value ranges from 3Q to 4Q to correspondto the
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`optimally determined range of the inner turn interval from
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`40 um to 70 um. When the number of inner turns is one,
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`which is optimal, the R value ranges from 4Q to 6Q to
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`correspond to the determined rangeof the innerturn interval
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`from 40 um to 70 um.
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`On the other hand, it can be seen that, when the number
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`of inner turns is two, the R value ranges from 6Q to 8Q to
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`correspond to the optimally determined range of the inner
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`turn interval from 40 um to 70 pm.
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`Here, since the R value must range from 6Q to 8Q as
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`recommended in the standards of the WPC and/or the PMA,
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`NFCrecognition efficiency and charging efficiency could be
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`increased under the specification in which the inner turn
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`interval ranges from 40 um to 70 um and one innerturn is
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`providedto satisfy the above-described range of the R value.
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`It can be appreciated that this increase in efficiencyresults
`from the structure of the NFC antenna 110 described with
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`reference to FIGS. 1 and 2 as well as the above-described
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`specification in which the innerturn interval ranges from 40
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`um to 70 um and one inner turn is provided.
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`The other two specifications with regard to the inner turn
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`interval and the number ofinner turns do notsatisfy the R
`value recommended in the standards of the WPC and/or the
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`PMA,and thus inevitably cause deterioration in NFC rec-
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`ognition efficiency and charging efficiency.
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`Comparative Example 2
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`FIG. 5 is a graph illustrating the comparison result
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`between the Q value and the inner turn interval of FIGS. 1
`and 2.
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`Referring to FIG. 5, when the number of inner turns is
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`two, the Q value ranges from 17 to 22 to correspondto the
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`optimally determined range of the inner turn interval from
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`40 um to 70 um. When the number of inner turns is one,
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`30
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`40
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`45
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`65
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`Page 12 of 15
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`Page 12 of 15
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`US 10,