Source: https://patents.google.com/patent/US7046121
Timestamp: 2018-02-22 15:03:09
Document Index: 511372637

Matched Legal Cases: ['Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 00', 'Application No. 98', 'Application No. 98', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99', 'Application No. 99']

US7046121B2 - Detection of an electric signature of an electromagnetic transponder - Google Patents
Detection of an electric signature of an electromagnetic transponder
US7046121B2
US7046121B2 US10343775 US34377503A US7046121B2 US 7046121 B2 US7046121 B2 US 7046121B2 US 10343775 US10343775 US 10343775 US 34377503 A US34377503 A US 34377503A US 7046121 B2 US7046121 B2 US 7046121B2
US10343775
US20030164742A1 (en )
I = Vg Z1 app . ( formula ⁢ ⁢ 1 )
Z1 app = R1 app = R1 + a 2 ⁢ L2 R2 · C2 , ⁢ with : ( formula ⁢ ⁢ 2 ) a 2 = k 2 · ω 2 · L1 · L2 X2 2 + ( L2 R2 · C2 ) 2 , ( formula ⁢ ⁢ 3 )
I = Vg R1 + k 2 · ω 2 · L1 · L2 2 Z2 2 · R2 · C2 . ⁢ with : ( formula ⁢ ⁢ 4 ) Z2 2 = X2 2 + ( L2 R2 · C2 ) 2 . ( formula ⁢ ⁢ 5 )
I off ⁢ - ⁢ load = Vg R1 . ( formula ⁢ ⁢ 6 )
X1 app = X1 - a 2 · X2 , ⁢ with : ( formula ⁢ ⁢ 7 ) X1 = ω · L1 - 1 ω · C1 . ( formula ⁢ ⁢ 8 )
a2 · X2 = VC1 off ⁢ - ⁢ oad I off ⁢ - ⁢ load - VC1 1 . ( formula ⁢ ⁢ 11 )
a 2 · X2 a max 2 · X2 = VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load - VC1 I VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load - VC1 max I max . ( formula ⁢ ⁢ 12 )
a 2 · X2 a max 2 · X2 = k 2 k max 2 . ( formula ⁢ ⁢ 13 )
k k max = VC1 I - VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load VC1 max I max - VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load . ( formula ⁢ ⁢ 14 )
X2 · R2 · C2 L2 = VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load - VC1 max I max Vg · ( 1 I max - 1 I off ⁢ - ⁢ load ) . ( formula ⁢ ⁢ 15 )
X2 · R2 · C2 L2
is constant. Further, excitation voltage Vg of the terminal's oscillating circuit is determined. A constant K2 respecting the following relation can thus be defined:
K2 = - Vg · X2 · R2 · C2 L2 = VC1 max I max - VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load 1 I max - 1 I off ⁢ - ⁢ load . ( formula ⁢ ⁢ 16 )
( VC1 I - VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load ) · ( 1 I max - 1 I off ⁢ - ⁢ load ) ( VC1 max I max - VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load ) · ( 1 I - 1 I off ⁢ - ⁢ load ) = 1. ( formula ⁢ ⁢ 17 )
Z1 app = R1 + ∑ i = 1 n ⁢ ⁢ a i 2 · L2 i R2 i · C2 i . (formula 18)
Z1 app = R1 + L2 R2 · C2 · ∑ i = 1 n ⁢ ⁢ a i 2 . (formula 19)
∑ i = 1 n ⁢ ⁢ a i 2 = ω 2 · L1 · L2 Z2 2 · ∑ i = 1 n ⁢ ⁢ k i 2 . (formula 20)
k av 2 = ∑ i = 1 n ⁢ k i 2 n . (formula 21)
∑ i = 1 n ⁢ ⁢ a i 2 = n · a av 2 . (formula 22)
I = Vg R1 + n · k av 2 · ω 2 · L1 · L2 2 Z2 2 · R2 · C2 . (formula 23)
I max ( n ) = Vg R1 + n · ( k av k max ) 2 · ( Vg I max ( 1 ) - R1 ) , (formula 24)
I max ( n ) = 1 n I max ( 1 ) + 1 - n I off ⁢ - ⁢ load . (formula 25)
k opt k max = 1 I off ⁢ - ⁢ load I max - 1 ⁢ . ( formula ⁢ ⁢ 26 )
X2 · R2 · C2 L2 = R2 · ( ω · C2 - 1 ω · L2 ) ⁢ . ( formula ⁢ ⁢ 27 )
C2 = 1 ω 2 · L2 + VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load - VC1 max I max R2 · Vg · ω 2 · ( 1 I max - 1 I off ⁢ - ⁢ load ) ⁢ ⁢ . ( formula ⁢ ⁢ 28 )
ω 2 · C2 tun = 1 ω 2 · L2 ⁢ . ( formula ⁢ ⁢ 29 )
term ⁢ VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load - VC1 max I max R2 · Vg · ω · ( 1 I max - 1 I off ⁢ - ⁢ load )
translates the transponder's detuning.
C2 = C2 tun - K2 R2 · Vg · ω ⁢ , ⁢ ( formula ⁢ ⁢ 30 )
K2 Vg · ω
gives an image proportional to the transponder's detuning. The above may of course be translated in terms of quality factor Q2 of the transponder. In this case, ratio K2/Vg gives an image proportional to the quality factor variation.
( VC1 I - VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load ) ( 1 I - 1 I off ⁢ - ⁢ load ) = K2 ⁢ . ( formula ⁢ ⁢ 31 )
VC1 = ( K2 · ( 1 I - 1 I off ⁢ - ⁢ load ) + VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load ) · I . ( formula ⁢ ⁢ 32 )
VC1 ( th , ⁢ n min ) = ( K2 · ( 1 I - 1 I off ⁢ - ⁢ load ) + VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load ) · I . ( formula ⁢ ⁢ 33 )
VC1 ( I , ⁢ n min + i ) = ( n min + i n min · ( VC1 ( th , ⁢ n min ) I - VC1 off ⁢ - ⁢ load I off ⁢ - ⁢ load ) + VC1 offl ⁢ - ⁢ load I off ⁢ - ⁢ load ) · I , ( formula ⁢ ⁢ 34 )
k 2 ⁡ ( I , ⁢ n + i ) = n min + i n min · k 2 ⁡ ( I , ⁢ th , ⁢ n min ) , ⁢ ( formula ⁢ ⁢ 35 )
US10343775 2000-08-09 2001-08-09 Detection of an electric signature of an electromagnetic transponder Active 2022-07-17 US7046121B2 (en)
FR0010476A FR2812986B1 (en) 2000-08-09 2000-08-09 Detection of an electrical signature of an electromagnetic transponder
FR00/10476 2000-08-09
PCT/FR2001/002591 WO2002013124A1 (en) 2000-08-09 2001-08-09 Detection of an electric signature of an electromagnetic transponder
US20030164742A1 true US20030164742A1 (en) 2003-09-04
US7046121B2 true US7046121B2 (en) 2006-05-16
ID=8853430
US10343775 Active 2022-07-17 US7046121B2 (en) 2000-08-09 2001-08-09 Detection of an electric signature of an electromagnetic transponder
US (1) US7046121B2 (en)
JP (1) JP4752170B2 (en)
CN (1) CN1201259C (en)
DE (2) DE60127686T2 (en)
EP (1) EP1307853B1 (en)
FR (1) FR2812986B1 (en)
WO (1) WO2002013124A1 (en)
US20130307674A1 (en) * 2012-05-18 2013-11-21 Proton World International N.V. Adaptation of a transmission between a terminal and an electromagnetic transponder
US8907761B2 (en) 2009-06-25 2014-12-09 Stmicroelectronics (Rousset) Sas Authentication of an electromagnetic terminal-transponder couple by the terminal
FR2947362A1 (en) * 2009-06-25 2010-12-31 St Microelectronics Sas Authentication of a terminal by an electromagnetic transponder
US4375289A (en) 1977-07-19 1983-03-01 PRECITEC Gesellschaft fur Prazisionstechnik und Elektronik mbH & Co. Entwicklungs und Vertriebs-KG Apparatus for monitoring a boundary line
US4660192A (en) 1985-04-11 1987-04-21 Pomatto Sr Robert P Simultaneous AM and FM transmitter and receiver
US5202644A (en) 1959-06-11 1993-04-13 Ail Systems, Inc. Receiver apparatus
US6028503A (en) 1996-11-05 2000-02-22 U.S. Philips Corporation Contactless data transmission and receiving device with a synchronous demodulator
US6335665B1 (en) 1999-09-28 2002-01-01 Lucent Technologies Inc. Adjustable phase and delay shift element
US6441804B1 (en) 1998-02-23 2002-08-27 Kye Systems Corp. Transmitter and receiver for use in a wireless cursor control system
US6654466B1 (en) 1997-04-17 2003-11-25 Rohm Co., Ltd. Data communication equipment, data communication system, and data communication method
US20030227323A1 (en) 2002-06-06 2003-12-11 Jean-Pierre Enguent Electromagnetic transponder reader
US6690229B2 (en) 2001-12-21 2004-02-10 Koninklijke Philips Electronics N.V. Feed back current-source circuit
US6879246B2 (en) * 2000-05-12 2005-04-12 Stmicroelectronics S.A. Evaluation of the number of electromagnetic transponders in the field of a reader
EP0857981B1 (en) * 1997-02-05 2002-12-11 EM Microelectronic-Marin SA Base station of a remote interrogation system with a voltage and phase controlled oscillator
KR20010006519A (en) * 1998-02-19 2001-01-26 비센트 비.인그라시아 Data communications terminal and method of adjusting a power signal generated therefrom
JP3582403B2 (en) * 1999-05-21 2004-10-27 株式会社デンソー Id tag reader writer
French Search Report from French Patent Application No. 00 01214, filed Jan. 31, 2000.
French Search Report from French Patent Application No. 00 06061, filed May 12, 2000.
French Search Report from French Patent Application No. 00 06064, filed May 12, 2000.
French Search Report from French Patent Application No. 00 06065, filed May 12, 2000.
French Search Report from French Patent Application No. 00 06071, filed May 12, 2000.
French Search Report from French Patent Application No. 00 06301, filed May 17, 2000.
French Search Report from French Patent Application No. 00 06302, filed May 17, 2000.
French Search Report from French Patent Application No. 98 08024, filed Jun. 22, 1998.
French Search Report from French Patent Application No. 98 08025, filed Jun. 22, 1998.
French Search Report from French Patent Application No. 99 04544, filed Apr. 7, 1999.
French Search Report from French Patent Application No. 99 04545, filed Apr. 7, 1999.
French Search Report from French Patent Application No. 99 04547, filed Apr. 7, 1999.
French Search Report from French Patent Application No. 99 04549, filed Apr. 7, 1999.
French Search Report from French Patent Application No. 99 07024, filed May 31, 1999.
International Search Report from International Patent Application No. PCT/FR 01 02621, filed Aug. 16, 2001.
International Search Report from PCT priority application No. PCT/FR01/02591.
US8994510B2 (en) * 2012-05-18 2015-03-31 Proton World International N.V. Adaptation of a transmission between a terminal and an electromagnetic transponder
JP4752170B2 (en) 2011-08-17 grant
FR2812986B1 (en) 2002-10-31 grant
EP1307853B1 (en) 2007-04-04 grant
CN1201259C (en) 2005-05-11 grant
US20030164742A1 (en) 2003-09-04 application
DE60127686D1 (en) 2007-05-16 grant
CN1454365A (en) 2003-11-05 application
DE60127686T2 (en) 2007-12-06 grant
JP2004506362A (en) 2004-02-26 application
FR2812986A1 (en) 2002-02-15 application
WO2002013124A1 (en) 2002-02-14 application
EP1307853A1 (en) 2003-05-07 application
US20030178483A1 (en) 2003-09-25 Noncontact communication medium and noncontact communication system
US6654466B1 (en) 2003-11-25 Data communication equipment, data communication system, and data communication method
EP1385120A1 (en) 2004-01-28 Portable information processing apparatus