Model 1P510S
Rev A
Typical Performance: 1400 MHz – 2300 MHz
-9
-9.25
-9.5
Coupling 1P510S
0
-5
-10
-15
Return Loss 1P510S
Coupling (dB)
-9.75
-10
-10.25
-10.5
-10.75
-11
1400
Return Loss (dB)
-20
-25
-30
-35
-40
-45
1500
1600
1700
1800 1900 2000
Frequency (Mhz)
Coupling 1P510S
2100
2200
2300
-50
1400
1500
1600
1700
1800
1900
Frequency (Mhz)
Return Loss 1P510S
2000
2100
2200
2300
-9
-9.25
-9.5
0
-5
-10
-15
Coupling (dB)
-9.75
-10
-10.25
-10.5
-10.75
-11
1400
Return Loss (dB)
-20
-25
-30
-35
-40
-45
1500
1600
1700
1800 1900 2000
Frequency (Mhz)
2100
2200
2300
-50
1400
1500
1600
1700
1800
1900
Frequency (Mhz)
2000
2100
2200
2300
COUPLING
Choice of a coupling value in an application normally
depends on the power level of the main (sampled) line.
For example, if the coupler is being used to monitor main
line power, the coupling value is selected to provide
sufficient power to the monitoring device and yet
minimize system loss. Note that any coupler reduces
power flowing in the main line by the amount coupled off;
a 10dB coupler reduces main line power by 1 dB (10%)
where a 20dB coupler reduces it by only 0.044dB (1%).
Anaren uses mean coupling and frequency sensitivity
with the coupling specification. The mean coupling value
is arrived at by periodically sampling the coupling value
over the specified band and averaging the readings.
Frequency sensitivity is the peak to peak variation in
coupling over the specified band.
VSWR & DIRECTIVITY
In directional couplers, directivity is specified in lieu of
isolation. Directivity is a measure of how well the coupled
power is isolated from reflections at the main line output
port. For example, open or short circuiting the output port
of a coupler with 20dB directivity would only affect the
coupled output power by 1% and only 0.1% for 30dB
directivity. High directivity is especially important if the
coupler is being used to measure the VSWR of a device
at its output port.
In this application, accurate
measurements of forward and reverse power are
required.
In theory, VSWR and directivity characteristics of a
coupler are perfect; the input and output ports are
perfectly matched and no power is coupled to the isolated
port. In practice, factors associated with the design and
manufacturing processes limit VSWR and directivity. The
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