| 摘要 |
PROBLEM TO BE SOLVED: To provide a transponder for an electronic identification system which is intended to widen the operating range by enhancing the restoration voltage. SOLUTION: The transponder 20 exhibits a high input impedance (>400Ω), because its input is directly connected to an antenna 22 which matches with a high input impedance. This transponder is intended to widen the operating range of the system, by enhancing the voltage on the capacitor C<SB>2</SB>which is to be restored from an inquiry signal. A modulator 30 of the transponder is constituted, such that the modulation depth of the back-scattering modulation of the inquiry signal is less than 80%, more preferably, about 30% for the modulation depth. As a result of this, widening of the operating range of the system can also be obtained. COPYRIGHT: (C)2010,JPO&INPIT |
