Non-contact IC card with antenna switching circuit
First Claim
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1. A batteryless non-contact IC card, using electromagnetic waves as a communication medium, comprising:
- an antenna resonance circuit for data transmission and reception, said antenna resonance circuit including first and second terminals;
a bridge rectifying circuit coupled to said antenna resonance circuit for rectifying a signal from said antenna resonance circuit; and
switching means for switching, in accordance with a switching signal, so that a lower-voltage signal is supplied to the first terminal of said antenna resonance circuit and a higher-voltage signal is extracted from the second terminal.
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Abstract
A batteryless non-contact type IC card using an electromagnetic wave as a communication medium includes an antenna resonance circuit for data transmission and reception, the antenna resonance circuit including first and second terminals; a bridge rectifying circuit coupled to the antenna resonance circuit for rectifying a signal from the antenna resonance circuit; and a switch for switching, in accordance with a switching signal, so that a lower-voltage is supplied to the first terminal of the antenna resonance circuit and a higher-voltage signal is extracted from the second terminal.
94 Citations
7 Claims
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1. A batteryless non-contact IC card, using electromagnetic waves as a communication medium, comprising:
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an antenna resonance circuit for data transmission and reception, said antenna resonance circuit including first and second terminals; a bridge rectifying circuit coupled to said antenna resonance circuit for rectifying a signal from said antenna resonance circuit; and switching means for switching, in accordance with a switching signal, so that a lower-voltage signal is supplied to the first terminal of said antenna resonance circuit and a higher-voltage signal is extracted from the second terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification