摘要
在测量微小样本介质参数时,若传输线背景信号过强可能导致微弱变化难以测量。为解决该问题,采用抵消法思路,设计了一种高灵敏度的微波测量传感器。该传感器基于共面波导结构,由两个威尔金森功分器和两条路径相差半个波长的传输线支路构成,使得两路信号相位相反幅值抵消。实际应用时分别将待测物和参考物放在两条支路上,通过测量两路信号的抵消效果来反映待测物和参考物介质参数的差异。对该器件未放置材料时自抵消效果进行仿真,结果表明在频率为5.02GHz处,传输参数S21达到-89.02dB。相较以往文献中提到的抵消型结构,本装置灵敏度大幅提高。
When measuring the permittivity of tiny samples,if the background signal of the transmission line is too strong,it may be difficult to measure weak changes.To solve this problem,a high-sensitivity microwave measurement sensor was designed using the offset method.The sensor is based on a coplanar waveguide structure and is composed of two Wilkinson power dividers and two transmission line branches that differ in path by half a wavelength,so that the opposite signal phases are able to cancel each other out.In practical application,the object to be measured and the reference object are respectively placed on two transmission line branches,and the difference in permittivity between the object to be measured and the reference object is reflected by measuring the offset effect of the two signals.Simulation has been run to test the offset effect of the device itself when no material was placed on it.The results show that the transmission parameter S21 reaches-89.02 dB at a frequency of 5.02 GHz.Compared with the offset structures mentioned in the previous literature,the sensitivity of this device is greatly improved.
作者
兰珂
邹焕
裘炜浩
汪海洋
Lan Ke;Zou Huan;Qiu Weihao;Wang Haiyang(School of Aeronautics and Astronautics,UESTC,Chengdu 611731,China;State Grid Zhejiang Information ＆ Telecommunication Company,Hangzhon 310007,China;School of Electronic Science and Engineering,UESTC,Chengdu 611731,China)
出处
《国外电子测量技术》
2018年第9期18-21,共4页
Foreign Electronic Measurement Technology
基金
国家自然科学基金(61601086,61671132)项目资助
