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Página principal > Artículos > Artículos publicados > Phase-variation microwave sensor for permittivity measurements based on a high-impedance half-wavelength transmission line |
Fecha: | 2021 |
Resumen: | A phase-variation microwave sensor operating in transmission and implemented by means of a high-impedance half-wavelength sensing line is reported in this paper. The sensor is useful for dielectric constant measurements and dielectric characterization of materials. By forcing the electrical length of the sensing line to be a half-wavelength when it is loaded with the so-called reference (REF) material, perfect matching is obtained regardless of the characteristic impedance of the line. This fact can be used to enhance the sensitivity for small perturbations, by merely increasing the characteristic impedance of the sensing line. An exhaustive analysis that supports such conclusion is reported in the paper. Then, two prototype sensors are designed and fabricated for validation purposes. As compared to the ordinary phase-variation permittivity sensor implemented by means of a matched ( 50-Ω) line with identical length, the sensitivity for small perturbations in the proposed sensor is 2. 1 times larger. Further advantages of these sensors are low-cost, small size, implementation in planar technology, and very simple design and fabrication, derived from the fact that the sensing region is a half-wavelength transmission line. |
Ayudas: | Agencia Estatal de Investigación PID2019-103904RB-I00 Agencia Estatal de Investigación IJC2019-040786-I Ministerio de Ciencia e Innovación IJCI-2017-31339 Ministerio de Ciencia e Innovación TEC2016-75650-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1159 |
Derechos: | Tots els drets reservats. |
Lengua: | Anglès |
Documento: | Article ; recerca ; Versió acceptada per publicar |
Materia: | Dielectric characterization ; Microstrip technology ; Microwave sensors ; Permittivity sensors ; Phase-variation sensors |
Publicado en: | IEEE sensors journal, Vol. 21, issue 9 (May 2021) , p. 10647-10656, ISSN 1530-437X |
Postprint 12 p, 928.3 KB |