5 CALIBRATION AND CALIBRATION KIT
110
Rload
(Load
Impedance)
Load impedance in [].
C
0, С1,
С2, С3)
The fringe capacitance of an OPEN standard, which causes a phase
offset of the reflection coefficient at high frequencies. The fringe
capacitance model is described as a function of frequency, which is
a polynomial of the third degree:
C = C0 + C1f + C2f2 + C3f3 , where
f – frequency [Hz]
C0…C3 – polynomial coefficients
Units: C0[F], C1[F/Hz], C2[F/Hz2], C3[F/Hz3]
L
(L0, L1,
L2, L3)
The residual inductance of a SHORT standard, which causes a
phase offset of the reflection coefficient at high frequencies. The
residual inductance model is described as a function of frequency,
which is a polynomial of the third degree:
L = L0 + L1f + L2f2 + L3f3 , where
f – frequency [Hz]
L0…L3 – polynomial coefficients
Units: L0[H], L1[H/Hz], L2[H/Hz2], L3[H/Hz3]
5.1.7.5 Data-Based Calibration Standards
The calibration standards defined by data are set using the table of S-parameters. Each
line of the table contains frequency and S-parameters of the calibration standard. For
one-port standards the table contains the value of only one parameter – S11, and for two-
port standards the table contains the values of all the four parameters – S11, S21, S12, S22.
The table of S-parameters can be filled in manually by the user or downloaded from a
file of Touchstone format. Files with *.s1p extension are used for one-port standards,
and files with *.s2p extension are used for two-port standards.
5.1.7.6 Scope of Calibration Standard Definition
Different methods of calibration apply either full or partial definitions of the calibration
standard kits.
The full two-port calibration, full one-port calibration, one-path two-port calibration,
and normalization use fully defined calibration standards, i.e. the standards with known
S-parameters. The S-parameters of OPEN, SHORT, LOAD, and THRU/LINE must be
defined by the model or by data.
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