摘要针对人体植入式设备中需要二次手术更换电池的缺点，设计了一种射频能量收集电路用于无线能量传输。射频能量收集电路主要由接收天线模块和射频前端模块两部分构成。接收天线模块包括天线和LC匹配网络，射频前端模块包括多级倍压整流网络、稳压元件和储能电容等。86480

   该射频能量收集电路的主要工作原理是：射频信号经由无线通讯设备（如手机等）或射频信号发生器产生，被射频功率放大器放大后由射频能量收集器收集，供给低功耗的电子设备使用。该电路设计主要完成的工作有：

    （1）完成接收端与倍压整流网络的功率匹配，通过ADS仿真测得电容和电感在功率最大化传输时的数值；（2）完成电路设计；（3）完成PCB电路图并焊接；（4）对电路进行测试和分析。

本文设计的射频能量收集电路有900MHz和2。4GHz两种天线接收方式。采用三种方式传输能量，发现LED灯和二极管都能被点亮，证明了电路收集到了微弱的能量。通过对电路输入不同的功率、接入不同的负载阻抗、改变多级倍压整流网络的级数和射频发射信号与天线之间的距离分别进行了测试。测试结果发现，输出电压的大小跟这些都有关系。因此电路的有效性及能量收集效率仍待提高。接下来，对电路进行了优化改进，采用一种多天线射频能量收集电路、四级并联的方式，用四个天线同时接收射频能量。测试后发现这样收集到的能量远高于最初接收到的能量。对电路进行测试，发现输出电压随着天线位置由表皮移向肌肉层而逐步下降。经多次测试及研究，总结出了影响射频能量收集电路性能的几个关键因素,例如发送信号的幅度、接收的距离以及天线的方位等。

毕业论文关键词: 阻抗匹配、倍压整流、RF能量收集、LC匹配

Abstract This article for implantable devices for two operations to replace the battery the shortcomings of a energy collection circuit is designed RF energy collection circuit mainly include receiving antenna module and front-end module two parts。 Receiving antenna module including antenna and LC matching network, front-end module includes multiple times, voltage regulator rectifier network components and energy storage capacitor。

The energy collection circuit of the main working principle is: signal via wireless communications equipment (such as mobile phone, etc。) or signal generator, power amplifier is enlarged by the energy collector, the supply of low power consumption electronic devices use。 The circuit design of main work includes:(1) to complete the receiving end voltage doubling rectifying power matching network, through the ADS simulation measured capacitance and inductance in power maximization of value。(2) complete the design of the circuit (3) complete PCB circuit diagram and welding (4) the test and analysis of circuit。

In this paper, after the completion of the design of energy collection circuit, to verify the effectiveness of the energy collection。 The circuit has both 900 m and 2。4 G antenna receiving way。 We through three ways for circuit energy input, found the LED lamp and diode can be lighted, it is proved that the circuit has collected a weak energy。 Next, through to the different circuit input power, access to the different load impedance, change the series multistage double rectifier network and radio frequency signal and the distance between the antenna was tested respectively。 Finally according to the result of test shows that the size of the output voltage has something to do with all these。 So the effectiveness of the proposed circuit and energy collection efficiency is still to be improved。 Next, the circuit is optimized to improve, the use of a multiple antenna energy collecting circuit, with the method of four parallel, with four antenna receiving energy at the same time。 After tests found that the collected energy than initially received energy。 For simulating circuit test, found that the output voltage with the antenna position by the epidermis to move to muscle layer and decline gradually。 After many tests and research, summarizes several key factors influencing the performances of energy collection circuit, such as signal amplitude,