A ultra-low power consumption wireless passive temperature sensor

A ultra-low power consumption wireless passive temperature sensor includes a communication antenna, an energy-taking antenna, a power management module, a temperature-frequency conversion module, a frequency-digit conversion module and a backscatter modulator. According to the invention, the energy-taking antenna is adopted to provide electric energy for the whole circuit; no built-in power source is needed; a problem of impossibility of replacing cells in the later period is solved; the manufacturing cost and later maintenance cost are substantially reduced; and the backscatter modulator is based on the principle of radar backscattering and has a characteristic of zero-power-consumption modulation and a simple circuit structure. 种超低功耗无线无源温度传感器，包括通信天线、取能天线、电源管理模块、温度-频率转换模块、频率-数字转换模块以及反向散射调制器。本发明采用取能天线的方式为整体电路提供电能，无需内置电源，解决了后期无法更换电池的困难，大大降低了制造成本和后期维护费用；反向散射调制器基于雷达反向散射原理，具有零功耗调制，电路结构简单的特点。