
Common practice methods 141
1
10
100
f/MHz
S
ij
-1
0
1
Im[S
21
]
Re[S
22
]
Im[S
22
]
Re[S
24
]
Im[S
24
]
Re[S
21
]
Figure 4.41
Results of S measurement on a 1 nF capacitor (Agilent mod. 16384A),
with the setup of Fig. 4.40. A set of nine spectra was obtained; the subset
S
22
,S
23
,S
24
is shown, separating real and imaginary parts. Other spectra of
the set, not shown, have similar appearances.
500
100
150
f/MHz
Y
4P
0
-20
20
40
Re[Y
4P
]
Im[Y
4P
]
Figure 4.42
The 4P admittance Y
4P
, as computed by means of Eq. (4.26) from the S mea-
surements of Fig. 4.41. The frequency, ≈65 MHz, of the sharp LC resonance
can be employed the input datum of Eq. (4.22).