1. Free-Space Materials Characterization by Reflection and Transmission Measurements using Frequency-by-Frequency and Multi-Frequency Algorithms
- Author
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Adriana Brancaccio, Renato C. Mesquita, Elson J. Silva, Alfred G. M. Pinto, Fabio J. F. Goncalves, Gonçalves, Fábio Júlio F., Pinto, Alfred G. M., Mesquita, Renato C., Silva, Elson J., and Brancaccio, Adriana
- Subjects
Permittivity ,Extraction algorithm ,Computer Networks and Communications ,Computer science ,Acoustics ,extraction algorithms ,lcsh:TK7800-8360 ,02 engineering and technology ,A-weighting ,Dielectric ,time-domain gating ,Nondestructive testing ,0202 electrical engineering, electronic engineering, information engineering ,Scattering parameters ,Electrical and Electronic Engineering ,free-space calibration ,business.industry ,free-space method ,lcsh:Electronics ,non-destructive testing ,020206 networking & telecommunications ,Free space ,material characterization ,021001 nanoscience & nanotechnology ,permittivity ,Computer Networks and Communication ,Hardware and Architecture ,Control and Systems Engineering ,Signal Processing ,Time domain gating ,conductivity ,permeability ,0210 nano-technology ,Material properties ,business ,Scattering parameter ,scattering parameters - Abstract
The knowledge of the electromagnetic constitutive properties of materials is crucial in many applications. Free-space methods are widely used for this purpose, despite their inherent practical difficulties. This paper describes an affordable free-space experimental setup for the characterization of flat samples in 1&ndash, 6 GHz in a non-anechoic environment. The extracted properties are obtained from the calibrated Scattering Parameters, using a frequency-by-frequency solution or a multi-frequency reconstruction. For the first, we describe how the Time-Domain Gating can be implemented and used for filtering the signals. For the latter, a weighting factor is introduced to balance the reflection and transmission data, allowing one to have a more favorable configuration. The different role of transmission and reflection measurements on the achievable results is analyzed with regard to experimental uncertainties and different noise scenarios. Results from the two strategies are analyzed and compared. Good agreement between simulation, measurement and literature is obtained. According to the reported results for dielectric materials, there is no need of filtering the data by a Time-Domain Gating in case of the multi-frequency approach. Experimental results for Polymethylmethacrylate (PMMA) and Polytetrafluorethylene (PTFE) samples validate both the setup and the processing.
- Published
- 2018