Novel Microwave Sensors Based on Split Ring Resonators for Measuring Permittivity
Novel Microwave Sensors Based on Split Ring Resonators for Measuring Permittivity
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用于测量介电常数的基于开口环谐振器的新型微波传感器
DOI：
10.1109/access.2018.2834726
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发表时间：
2018-01-01
期刊：
影响因子：
3.9
通讯作者：
Wang, Gaofeng
中科院分区：
文献类型：
--
作者：
Xu, Kuiwen;Liu, Yang;Wang, Gaofeng
测量材料的电磁特性在许多领域有着重要的应用。提出了两种基于扩展长腿开口环谐振器（SRR）的电小传感器，两层和三层磁耦合SRRs，提出了测量未知材料的小样品的介电常数。利用磁共振谐振器的特性，提出的谐振器具有结构紧凑（两层和三层磁耦合谐振器分别为<inline-formula><tex-math notation="LaTeX">0.067\lambda_{0}\times 0.067\lambda _{0}$</tex-math></inline-formula>和<inline-formula><tex-math notation="LaTeX">0.052\lambda_{0}\times 0.052\lambda_{0}$</tex-math></inline-formula>）、高品质因数（<inline-formula><tex-math notation="LaTeX">$Q$</tex-math></inline-formula>）和稳定谐振等优点。特别是，所提出的三层磁耦合传感器与SRR上的相对分裂是能够进一步提高品质因数和具有更好的稳定性相比，两层耦合传感器。该传感器通过改变谐振频率和多项式拟合的方法，可以准确地计算出未知的介电常数。仿真和实验结果验证了所提出的方法和设计的有效性。该谐振器具有体积小、远场辐射小等特点，可与各种介电常数测量算法相结合，在特定实验装置之外的广泛环境中提高测量精度。
Measuring the electromagnetic properties of materials has important applications in many fields. In this paper, two electrically small sensors based on the split ring resonators (SRRs) with extended long legs, i.e., two-layer and three-layer magnetic coupled SRRs, are proposed to measure the permittivity of small samples of unknown materials. By virtue of the characteristics of SRRs, the proposed resonators have several merits, such as extremely compact size (<inline-formula> <tex-math notation="LaTeX">$0.067\lambda _{0}\times 0.067\lambda _{0}$ </tex-math></inline-formula> and <inline-formula> <tex-math notation="LaTeX">$0.052\lambda _{0}\times 0.052\lambda _{0}$ </tex-math></inline-formula> for two-layer and three-layer magnetic coupled SRRs, respectively), high quality factor (<inline-formula> <tex-math notation="LaTeX">$Q$ </tex-math></inline-formula>), and stable resonance. Especially, the proposed three-layer magnetic coupled sensor with opposite splits on the SRRs is able to further improve the quality factor and have better stability compared with the two-layer coupled sensor. By different shifting resonant frequencies instead of the single ones and the polynomial fitting method, the proposed sensors can accurately calculate the unknown permittivity. Simulated and experimental results have validated the efficacy of the proposed approach and designs. With the features of compact size and lower far-field radiation, the proposed resonators can be combined with various permittivity measurement algorithms to improve the measurement accuracy in a wide range of environments beyond the specific experimental setup.