车载应答器天线坠入铁轨或其附近， 导致列车脱轨。
The onboard responder antenna drops into or near the rail top which cause the train digression .
本文实现了天线、ASK调制、应答器的电源、负载调制、解调、电源传感器和高频功放模块。
Finally, the antenna, ASK modulation, power supply of the tag, load impedance modulation, demodulation, power supply sensor and HF power amplifier were realized.
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