User Manual

SARK-110-ULM User’s Manual
Rev 1.0 June 22
th
, 2019 - 52 - © 2019, Melchor Varela – EA4FRB
Appendix A: Glossary of 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.