【摘要】 为了精确测量固体材料的介电常数，提出了一种基于微带耦合线的微波传感器。这种传感器具有结构简单、高灵敏度等优点。传感器空载谐振频率为3.95 GHz，通过对介电常数范围1～10的材料进行仿真模拟，谐振频率随电场变化而向低频偏移，得到传感器谐振频率与介电常数间的线性关系，并选取5种材料实测，验证拟合公式。结果显示，传感器灵敏度为4.4%，测量误差小于1.5%，证实了将谐振频率与介电常数建立函数关系，可实现对介电常数的准确测量，验证了该方法的可行性。更多还原

【Abstract】 For the purpose of measuring the dielectric constant of solid materials accurately, this paper proposes a microwave sensor based on microstrip coupled lines, which has the advantages of simple structure and high sensitivity. The no-load resonant frequency of the sensor is 3.95 GHz. Through simulation with materials with a dielectric constant range of 1 to 10, the resonant frequency shifts toward lower frequencies as the electric field changes. The similar linear relationship between the sensor’s resonant frequency and the dielectric constant is obtained, and five materials are selected for actual measurement to verify the fitting formula. The results showed that the sensitivity of the sensor was 4.4%, and the measurement error was less than 3%, confirming the feasibility of establishing a functional relationship between the resonant frequency and the dielectric constant and accurately measuring it.更多还原