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Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 1
Prof. Luca Perregrini
Dept. of Electrical, Computer and Biomedical EngineeringUniversity of Pavia
e-mail: [email protected]: microwave.unipv.it
Course on Microwave Measurements
Characterization of materials for microwave applications
Summary
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 2
Dielectric constant & loss tangent
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 3
Polarization mechanism
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 4
Debye materials
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 5
DC measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 6
AC measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 7
Transmission line measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 8
Transmission line measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 9
Transmission line measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 10
Transmission line measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 11
Transmission line measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 12
Transmission line measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 13
Transmission line measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 14
Coaxial probe measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 15
Coaxial probe measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 16
Coaxial probe measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 17
Free-space measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 18
Free-space measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 19
Free-space measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 20
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 21
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 22
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 23
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 24
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 25
-40
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-15
-10
-5
0
2.3 2.35 2.4 2.45 2.5
|S21
| [dB
]
Frequency [GHz]
S21 rif
S21 meas
20 1
1
1 1rf f D
a f d
2
1 0
1 1 1tan2 r
Da d Qu Qu
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 26
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 27
The relative dielectric constant and the loss tangent decrease asthe percentage of dehydration of the sample.
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 28
System for the study of the effect of change in temperature
Resonant cavity measurement
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 29
After an initial decrease of the values in the lignin, due to the dehydration, the relative dielectric constant and the loss tangent increase with temperature for both substances.
Measurement techniques comparison
Microwave Measurements Prof. Luca Perregrini Characterization of materials for microwave applications, pag. 30
