基于微波的无线无源贴片式温度传感器

A Wireless Passive Patch Temperature Sensor Based on Microwave

针对温度参数的测试需求,选择印刷电路板（PCB）材料作为传感器的基板,利用其介电性能设计了一种基于微波的无线无源温度传感器,其谐振频率为2.4 GHz。传感器集成了贴片天线用以无线传输温度信号,当温度升高时,PCB材料的介电常数增大,传感器的谐振频率降低,通过监测传感器的谐振频率达到测温的目的。经过理论分析、参数设计、软件仿真和实验测试过程,验证了贴片式温度传感器的可行性和实用性。在25~115℃内,谐振频率由2.395 GHz降为2.344 GHz,绝对灵敏度为566.7 kHz/℃。该传感器具有集成度高、结构简单、易于加工和成本低的优点。

For the test requirements of temperature parameters,the printed circuit board（PCB）material was selected as the substrate of the sensor.A wireless passive temperature sensor based on microwave was designed by using its dielectric properties.The resonant frequency of the sensor is 2.4 GHz.The temperature signals were transmitted wirelessly by the sensor integrated with a patch antenna.The dielectric constant of the PCB material increases and the resonant frequency of the sensor decreases when the temperature increases.The purpose of the temperature measurement was achieved by monitoring the resonant frequency of the sensor.Through the theoretical analysis,parameter design,software simulation and experiment test process,the feasibility and practicality of the patch temperature sensor were verified.The resonant frequency reduces from 2.395 GHz to 2.344 GHz and the absolute sensitivity is 566.7 kHz/℃ in the temperature range of 25-115 ℃.The sensor has the advantages of high integration,simple structure,easy processing and low cost.