| 摘要 |
A coding and decoding system for wireless telecommunication comprises a wireless telecommunication device and a personal card. The wireless telecommunication device consists of a first piezoelectric substrate, a coded IDT, a first electrode-group, a first amplifier, an antenna, a second amplifier, a second electrode-group, a first intermediary IDT, and a signal analyzer. The personal card attached to the wireless telecommunication device consists of a second piezoelectric substrate, a personal coded IDT, a third electrode-group, a second intermediary IDT. The coding and decoding system for wireless telecommunication has four sections, that is, (1) a personal transmitting section composed of the second piezoelectric substrate, the personal coded IDT, the third electrode-group, the first amplifier, and the antenna; (2) a main transmitting section composed of the first piezoelectric substrate, the coded IDT, the first electrode-group, the first amplifier, and the antenna; (3) a personal receiving section composed of the antenna, the second amplifier, the first piezoelectric substrate, the second electrode-group, the second piezoelectric substrate, the second intermediary IDT, the personal coded IDT, and the signal analyzer; and (4) a main receiving section composed of the antenna, the second amplifier, the first piezoelectric substrate, the second electrode-group, the first intermediary IDT, the coded IDT, and the signal analyzer.
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