Tesi etd-03122018-153157

Tipo di tesi

Tesi di laurea magistrale

Autore

LENZINI, STEFANO

URN

etd-03122018-153157

Titolo

Complex permittivity measurement techniques of solid and liquid materials at microwave frequencies

Titolo in inglese

Complex permittivity measurement techniques of solid and liquid materials at microwave frequencies

Struttura

Dipartimento di Ingegneria

Corso di studi

ELECTRONICS ENGINEERING - Ingegneria Elettronica (D.M.270/04)

Commissione

Nome Commissario	Qualifica
VINCETTI LUCA	Primo relatore

Parole chiave

dielectric
measurement
microwave
permittivity
resonant cavity

Data inizio appello

2018-04-12

Disponibilità

Accesso limitato: si può decidere quali file della tesi rendere accessibili. Disponibilità mixed (scegli questa opzione se vuoi rendere inaccessibili tutti i file della tesi o parte di essi)

Data di rilascio

2058-04-12

Riassunto analitico

The measurement of the materials dielectric permittivity is nowadays required in the industrial field and is very useful in what is concerning the microwave sector.
In this thesis different existing measurement techniques are analyzed and compared. Some of them are exploited for the characterization of two materials: an hydraulic oil, new and used, and a specific crop sample. In particular the performed techniques are: the coaxial probe and the resonant cavity one. For the first is used the commercial sensor HP85070B. For the second technique two different types of cavities are considered: a preexistent cylindrical resonant cavity and a coaxial resonant cavity.
The cylindrical cavity is initially studied through simulation for discover the best ways of using it, then the measurements are performed. The coaxial resonant cavity is designed for satisfies different parameters such as the frequency range.
Finally, an analysis of the obtained data and possible future improvements are given.

Abstract

The measurement of the materials dielectric permittivity is nowadays required in the industrial field and is very useful in what is concerning the microwave sector. In this thesis different existing measurement techniques are analyzed and compared. Some of them are exploited for the characterization of two materials: an hydraulic oil, new and used, and a specific crop sample. In particular the performed techniques are: the coaxial probe and the resonant cavity one. For the first is used the commercial sensor HP85070B. For the second technique two different types of cavities are considered: a preexistent cylindrical resonant cavity and a coaxial resonant cavity. The cylindrical cavity is initially studied through simulation for discover the best ways of using it, then the measurements are performed. The coaxial resonant cavity is designed for satisfies different parameters such as the frequency range. Finally, an analysis of the obtained data and possible future improvements are given.

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