Tesi etd-04032015-105112 |
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Tipo di tesi
Tesi di laurea magistrale
Autore
FANCIULLI, FILIPPO
URN
etd-04032015-105112
Titolo
Characterization of Innovative Materials for the Design of Wireless Wearable Devices
Dipartimento
INGEGNERIA DELL'INFORMAZIONE
Corso di studi
INGEGNERIA DELLE TELECOMUNICAZIONI
Relatori
correlatore Ing. Genovesi, Simone
correlatore Ing. Costa, Filippo
relatore Prof. Monorchio, Agostino
correlatore Ing. Costa, Filippo
relatore Prof. Monorchio, Agostino
Parole chiave
- wearable devices
- waveguide materials characterization
- controlled resistance film
- conductive ink
- AMC
- wireless wearable antenna
Data inizio appello
30/04/2015
Consultabilità
Non consultabile
Data di rilascio
30/04/2085
Riassunto
The main contribution of this work is twofold.
On one side, a survey over conductive or controlled resistance materials has been preliminarily addressed. In particular,conductive woven or nonwoven fabrics, conductive paints or inks and controlled resistance films have been analyzed in order to highlight technological changes over years. A procedure based on scattering parameters to retrieve the surface impedance of thin materials samples has been employed to characterize the surface impedance of commercially available types of controlled resistance films and conductive inks.
The measurements have been performed by accommodating the samples transversally in a standard waveguide. Results obtained with different types of waveguide are compared as well.
The second part of this research has exploited the previous results on inks sheet resistance to implement wearable wireless antenna prototypes.
The manufactured devices have been manufacturedby printing the aforementioned conductive inks in a commercially available desktop inkjet printer.
Different printing substrates have been tested and the operational printing resolution has been initially investigated.
Subsequently, Artificial Magnetic Conductor (AMC) panels and a dual-band Coplanar Waveguide (CPW) antenna have been numerically and experimentally investigated.
An AMC panel designed to operate in the UHF frequency band has been finally employed to realize an electrically sm all antenna (total dimensions lower than λ0/8) able to operate in an on-body configuration.
Free space measurements with a vector network analyzer confirmed the superior performance of the proposed antenna with respect to conventional configurations.
On one side, a survey over conductive or controlled resistance materials has been preliminarily addressed. In particular,conductive woven or nonwoven fabrics, conductive paints or inks and controlled resistance films have been analyzed in order to highlight technological changes over years. A procedure based on scattering parameters to retrieve the surface impedance of thin materials samples has been employed to characterize the surface impedance of commercially available types of controlled resistance films and conductive inks.
The measurements have been performed by accommodating the samples transversally in a standard waveguide. Results obtained with different types of waveguide are compared as well.
The second part of this research has exploited the previous results on inks sheet resistance to implement wearable wireless antenna prototypes.
The manufactured devices have been manufacturedby printing the aforementioned conductive inks in a commercially available desktop inkjet printer.
Different printing substrates have been tested and the operational printing resolution has been initially investigated.
Subsequently, Artificial Magnetic Conductor (AMC) panels and a dual-band Coplanar Waveguide (CPW) antenna have been numerically and experimentally investigated.
An AMC panel designed to operate in the UHF frequency band has been finally employed to realize an electrically sm all antenna (total dimensions lower than λ0/8) able to operate in an on-body configuration.
Free space measurements with a vector network analyzer confirmed the superior performance of the proposed antenna with respect to conventional configurations.
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