无线传感器网络中基于可重构天线的谐波上行链路调制器

A harmonic uplink transponder based on the re-configurable antenna in wireless sensor networks

在民用航空器电台检查中,无线传感器网络的能源供给问题亟待解决。本文提出了一种基于可重构宽带缝隙天线的新型上行链路调制器结构,实现了低功耗谐波上行通信,降低了信息发射功耗。该结构充分利用整流器产生的二次谐波作为上行载波,通过上行基带信号对可重构宽带缝隙天线进行动态偏置,实现对载波的幅度调制。上行链路调制器的工作频率为2.45 GHz,在-20 dBm的射频输入功率下,仅采用10μA的调制电流进行通信,减少了节点的信息发射功耗,并且基带信号的调制几乎不影响整流器的转换效率,展示了该调制器的成功应用。该结构具有低成本、低功耗、易集成等优点,在民航无线传感器网络中具有良好的工程应用前景。

In the inspection of civil aircraft radio stations,the energy supply of wireless sensor networks needs to be solved urgently.In this paper,a novel uplink transponder structure based on re-configurable wideband slot antenna is proposed,which realizes low-power harmonic uplink communication,reducing the power consumption of information transmission.The proposed transponder fully utilizes the second harmonic generated by the rectifier as the uplink carrier.It modulates this carrier in amplitude through a re-configurable broadband slot antenna that is dynamically biased by the uplink baseband signals.The operating frequency of the uplink transponder is 2.45 GHz,and at an RF input power of−20 dBm,only a modulation current of 10μA is used for communication,which reduces the information transmission power consumption of the WSNs node.Moreover,the modulation of the baseband signal hardly affects the conversion efficiency of the rectifier,demonstrating the successful application of the transponder.The structure has the advantages of low cost,low power consumption,easy integrating,and so on,having good engineering application prospects in WSNs.