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Model DC4759J5020AHF
Rev C
Definition of Measured Specifications
Mathematical
Mathematical
Parameter
Definition
Representation
for Pin Configuration 1
Representation
for Pin Configuration 2
The impedance match of
the coupler to a 50 ?
Return Loss (dB)=
Return Loss (dB)=
Return Loss
system. Return Loss is an
alternate means to
20 log 10 ( S ii ) i = 1, 2, 3, 4
20 log 10 ( S ii ) i = 1, 2, 3, 4
express VSWR.
C = 20 log 10 34
C = 20 log 10 21
At a given frequency ( ω n ),
coupling is the input power
divided by the power at
Coupling (dB) =
S
Coupling (dB) =
S
Mean Coupling
the coupled port. Mean
coupling is the average
Mean Coupling (dB) =
N
Mean Coupling (dB) =
N
value of the coupling
values in the band. N is
∑ C ( ω
n = 1
n
)
∑ C ( ω
n = 1
n
)
the number of frequencies
in the band.
N
N
10 log 10 14 34 )
10 log 10 41 21 )
Insertion Loss
Transmission
Loss
The input power divided
by the sum of the power at
the two output ports.
The input power divided
by the power at the direct
port.
2 2
( S + S
20 log 10 ( S 14 )
2 2
( S + S
20 log 10 ( S 41 )
Directivity
The power at the coupled
port divided by the power
at the isolated port.
20 log 10 (
S 24
S 34
)
20 log 10 (
S 31
S 21
)
The decibel difference
Frequency
Sensitivity
between the maximum in
band coupling value and
the minimum in band
(Max Coupling (dB) – Min
Coupling (dB))/2
(Max Coupling (dB) – Min
Coupling (dB))/2
coupling value.
* 100% RF test is performed on configuration 1 where port 1 is connected to pin1, port 2 is connected to pin 2, port 3 is connected to pin 5 and port 4 is
connected to pin 6 .
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