"We present the measurements performed with a. custom coaxial-cage line designed to determine the complex. dielectric permittivity of large samples, made of granular and\/or. liquid materials. The open structure of the cage facilitates the. filling of the line, and allows the uniform compactness of the. granular materials having large grain size. The electromagnetic. parameters of the samples are retrieved using the line scattering. coefficients (S-parameters), measured with a vector network analyzer. in the frequency range 1MHz to 3 GHz. The measurements. are carried out on water, ethanol, and glass beads using the. Boughriet method, which, for non magnetic materials, optimizes. the Nicolson–Ross–Weir algorithm. The results confirm that such. a device accurately estimates the material complex permittivity. in a wide frequency band. However, at very low frequencies and. at frequencies multiple of the line half-wavelength resonances,. the accuracy significantly reduces. In particular, the accuracy. gets worse for materials with high permittivity and low losses.. Nevertheless, for natural geo-materials, usually characterized by. appreciable losses, the coaxial-cage line can effectively be used. to accurately estimate the material electromagnetic properties in. a wide frequency band."
Mattei, E., Lauro, S., Pettinelli, E., Vannaroni, G. (2013). Coaxial-Cage Transmission Line for Electromagnetic Parameters Estimation. IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 62(11) [10.1109/TIM.2013.2266015].
Coaxial-Cage Transmission Line for Electromagnetic Parameters Estimation
MATTEI, ELISABETTA;LAURO, SEBASTIAN;PETTINELLI, Elena;
2013-01-01
Abstract
"We present the measurements performed with a. custom coaxial-cage line designed to determine the complex. dielectric permittivity of large samples, made of granular and\/or. liquid materials. The open structure of the cage facilitates the. filling of the line, and allows the uniform compactness of the. granular materials having large grain size. The electromagnetic. parameters of the samples are retrieved using the line scattering. coefficients (S-parameters), measured with a vector network analyzer. in the frequency range 1MHz to 3 GHz. The measurements. are carried out on water, ethanol, and glass beads using the. Boughriet method, which, for non magnetic materials, optimizes. the Nicolson–Ross–Weir algorithm. The results confirm that such. a device accurately estimates the material complex permittivity. in a wide frequency band. However, at very low frequencies and. at frequencies multiple of the line half-wavelength resonances,. the accuracy significantly reduces. In particular, the accuracy. gets worse for materials with high permittivity and low losses.. Nevertheless, for natural geo-materials, usually characterized by. appreciable losses, the coaxial-cage line can effectively be used. to accurately estimate the material electromagnetic properties in. a wide frequency band."I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
