Measurement of complex terahertz dielectric properties of polymers using an improved free-space technique
Chang,Tianying1,2; Zhang,Xiansheng2; Yang,Chuanfa2; Sun,Zhonglin2; Cui,Hong-Liang1,3
Source PublicationMeasurement Science and Technology
AbstractAbstract The complex dielectric properties of non-polar solid polymer materials were measured in the terahertz (THz) band by a free-space technique employing a frequency-extended vector network analyzer (VNA), and by THz time-domain spectroscopy (TDS). Mindful of THz wave’s unique characteristics, the free-space method for measurement of material dielectric properties in the microwave band was expanded and improved for application in the THz frequency region. To ascertain the soundness and utility of the proposed method, measurements of the complex dielectric properties of a variety of polymers were carried out, including polytetrafluoroethylene (PTFE, known also by the brand name Teflon), polypropylene (PP), polyethylene (PE), and glass fiber resin (Composite Stone). The free-space method relies on the determination of electromagnetic scattering parameters (S-parameters) of the sample, with the gated-reflect-line (GRL) calibration technique commonly employed using a VNA. Subsequently, based on the S-parameters, the dielectric constant and loss characteristic of the sample were calculated by using a Newtonian iterative algorithm. To verify the calculated results, THz TDS technique, which produced Fresnel parameters such as reflection and transmission coefficients, was also used to independently determine the dielectric properties of these polymer samples, with results satisfactorily corroborating those obtained by the free-space extended microwave technique.
Keywordfree-space method vector network analyzer gated-reflect-line calibration THz time-domain spectroscopy polymer complex dielectric properties
WOS IDIOP:0957-0233-28-4-aa58b5
PublisherIOP Publishing
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Document Type期刊论文
Affiliation1.College of Instrumentation & Electrical Engineering, Jilin University, Changchun, Jilin 130012, People’s Republic of China
2.Institute of Automation, Shandong Academy of Sciences, Jinan, Shandong 250014, People’s Republic of China
3.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, People’s Republic of China
Recommended Citation
GB/T 7714
Chang,Tianying,Zhang,Xiansheng,Yang,Chuanfa,et al. Measurement of complex terahertz dielectric properties of polymers using an improved free-space technique[J]. Measurement Science and Technology,2017,28(4).
APA Chang,Tianying,Zhang,Xiansheng,Yang,Chuanfa,Sun,Zhonglin,&Cui,Hong-Liang.(2017).Measurement of complex terahertz dielectric properties of polymers using an improved free-space technique.Measurement Science and Technology,28(4).
MLA Chang,Tianying,et al."Measurement of complex terahertz dielectric properties of polymers using an improved free-space technique".Measurement Science and Technology 28.4(2017).
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