Source: https://patents.google.com/patent/US20090272814A1/en
Timestamp: 2018-12-11 05:56:28
Document Index: 215721687

Matched Legal Cases: ['arts 12', 'art 12', 'arts 12', 'arts 22', 'art 22', 'arts 22', 'arts 32', 'art 32', 'arts 32']

US20090272814A1 - Passive Transponder and an Item with a Passive Transponder - Google Patents
Passive Transponder and an Item with a Passive Transponder Download PDF
US20090272814A1
US20090272814A1 US12435469 US43546909A US2009272814A1 US 20090272814 A1 US20090272814 A1 US 20090272814A1 US 12435469 US12435469 US 12435469 US 43546909 A US43546909 A US 43546909A US 2009272814 A1 US2009272814 A1 US 2009272814A1
US12435469
FIG. 1 shows a first embodiment of a passive transponder 10 comprising a diode 11, an antenna having two electrically conductive parts 12 a and 12 b, and a transmission line 13. Each electrically conductive part 12 a, 12 b of the antenna comprises in this embodiment an elongated thread 14 or wire having a first end 15 and a second end 16. The diode 11 is electrically connected between the first ends 15 of the elongated threads 14, and the transmission line 13, which is preferably implemented as a flexible thread, is adapted to match the impedance of the diode 11 to an impedance of the antenna by arranging the transmission line between the two electrically conductive parts 12 a and 12 b of the antenna. A dielectric cover 17 is preferably arranged around the antenna, transmission line 13, and diode 11, as indicated by the dash-dotted line in the figure, to increase the performance of the passive transponder.
FIG. 2 shows a second embodiment of a passive transponder 20, comprising a diode 21, an antenna having two conductive parts 22 a, 22 b, and a transmission line 23. Each electrically conductive part 22 a, 22 b of the antenna comprises in this embodiment a short thread 24 having a first end 25 and a second end 26, and a thin narrow foil strip 28 electrically connected to the second ends 26 of the threads 24. The diode 21 is electrically connected between the first ends 25 of the threads 24, and the transmission line 23, which is preferably implemented as a flexible thread, is adapted to match the impedance of the diode 21 to an impedance of the antenna by arranging the transmission line 23 between the two electrically conductive parts 22 a, 22 b of the antenna. A dielectric cover 27 is preferably arranged around the antenna, transmission line 23, and diode 21, as indicated by the dash-dotted line in the figure, to increase the performance of the passive transponder.
FIG. 3 shows a third embodiment of a passive transponder 30, comprising a diode 31, an antenna having two conductive parts 32 a, 32 b, and a transmission line 33. Each electrically conductive part 32 a, 32 b of the antenna comprises in this embodiment an elongated thread 34 having a first end 35 and a second end 36, and at least one additional thread, in this embodiment four additional threads 38, electrically connected to a point 39 on the elongated thread 34 situated between the first end 35 and the second end 36 of each thread 34. The diode 31 is electrically connected between the first ends 35 of the threads 34, and the transmission line 33, which is preferably implemented as a flexible thread, is adapted to match the impedance of the diode 31 to an impedance of the antenna by arranging the transmission line 33 between the two electrically conductive parts 32 a, 32 b of the antenna. A dielectric cover (not shown) can be arranged around the antenna, transmission line 33, and diode 31, as discussed in connection with FIG. 5.
1. A passive transponder, comprising:
an antenna having two electrically conductive parts, wherein each electrically conductive part of the antenna comprises a flexible conductive thread having a first end and a second end;
a diode electrically connected to a first end of the flexible conductive thread of the antenna; and
a transmission line connected to the antenna and to the diode, wherein the transmission line is adapted to match the impedance of the diode to an impedance of the antenna; and the passive transponder, when hit by radio frequency (RF) power of a first frequency f1, retransmits RF power of a harmonic frequency fh.
US12435469 2008-05-05 2009-05-05 Passive Transponder and an Item with a Passive Transponder Abandoned US20090272814A1 (en)
US5033908 true 2008-05-05 2008-05-05
US12435469 US20090272814A1 (en) 2008-05-05 2009-05-05 Passive Transponder and an Item with a Passive Transponder
US20090272814A1 true true US20090272814A1 (en) 2009-11-05
ID=41256466
US12435469 Abandoned US20090272814A1 (en) 2008-05-05 2009-05-05 Passive Transponder and an Item with a Passive Transponder
US (1) US20090272814A1 (en)
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