6 MEASUREMENT DATA ANALYSIS
205
6.6 S-Parameter Conversion
S-parameter conversion function allows conversion of the measurement results (Sab) to
the following parameters:
§Equivalent impedance (Zr) and equivalent admittance (Yr) in
reflection measurement:
ab
ab
ar S
S
ZZ -
+
×=1
1
0
r
rZ
Y1
=
§Equivalent impedance (Zt) and equivalent admittance (Yr) in
transmission measurement:
)(
2
00
00
ba
ab
ba
tZZ
S
ZZ
Z+-
××
=
t
tZ
Y1
=
§Inverse S-parameter:
()
ab
S
1
§Equivalent impedance (Ztsh) and equivalent admittance (Ytsh) in
transmission shunt measurements:
tsh
tsh Y
Z1
=
)(
2
00
00
ba
ab
ba
sht YY
Y
YY
Y+-
××
=
a
aZ
Y
0
0
1
=,
b
bZ
Y
0
0
1
=
§S-parameter complex conjugate.
Where:
Z0a – characteristic impedance of Port a,
Z0b – characteristic impedance of Port b,
Zab – measured S-parameter (a and b are the port numbers).
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