SARK 110 - Appendix B: Fundamental Parameters

SARK
SARKSARK
SARK-
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-110
110110
110 User’s Manual
Rev 1.2.6 October 3
rd
, 2015 - 71 - © Melchor Varela – EA4FRB 2011-2015
Appendix B: Fundamental Parameters
Abbreviation Parameter Description
Rs Series resistance Resistive value of a series impedance
Xs Series reactance Reactance value of a series impedance
Rp Parallel resistance Resistive value of a parallel impedance
Xp Parallel reactance Reactance value of a parallel impedance
|Zs| Magnitude of a
series Impedance
Represents the absolute magnitude of the ratio of the
voltage difference amplitude to the current amplitude.
(
)
22
|| XRZ +=
<Zs Impedance Angle It is a measure of the phase angle of the ratio of the
amplitude of the voltage to the amplitude of the current,
expressed in degrees.
VSWR Voltage Standing
Wave Ratio
It is a measure of how efficiently radio-frequency power is
transmitted from a power source, through a transmission
line and into a load (for example, from a power amplifier
through a transmission line and into an antenna).
RL Return Losses
(S11 dB)
Return loss is the negative of the magnitude of the
reflection coefficient in dB.
)(10log20 RhoRL
×
=
CL Cable Losses Measurement of insertion loss of a cable in dB. The
measurement should be performed by applying a short
circuit at the cable end.
)
2
(
RL
ABSCL =
|Rho| Magnitude of a
Reflection
Coefficient (Rho or
S11)
It is a measure of the absolute magnitude of the ratio of
the amplitude of the reflected wave to the amplitude of the
incident wave.