Terahertz free-space dielectric property measurements using time- and frequency-domain setups

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Original languageEnglish
Article numbere21839
Journal / PublicationInternational Journal of RF and Microwave Computer-Aided Engineering
Issue number9
Online published24 May 2019
Publication statusPublished - Sept 2019


Based on a simple and effective calculation method, two free-space measurement setups are employed to investigate the dielectric properties of various materials at terahertz (THz) frequencies. One setup involves THZ time-domain spectroscopy (THz-TDS) at a frequency range of 0.4 to 1 THz. The other setup comprises a vector network analyzer (VNA) with pairs of VAN extenders (VNAXs) and diagonal standard gain horns (SGHs) at a frequency range of 0.22 to 1.1 THz. The calculation method is verified for the THz-TDS system and employed in the VNA system for the first time. Dielectric properties, including refractive indices, power absorption coefficients, relative permittivities, and loss tangents, are calculated from measured transmission data. Several materials, including printed circuit boards and 3D printing materials, are characterized to verify the calculation method and compare the measurement setups.

Research Area(s)

  • dielectric properties, free space, terahertz (THz), terahertz time-domain spectroscopy (THz-TDS), vector network analyzer (VNA)