Model XC0450A-03
Rev B
Insertion Loss and Power Derating Curves
Typical Insertion Loss Derating Curve for XC0450A-03
-0.15
typical insertion loss(f=480Mhz)
70
80
Power Derating Curve for XC0450E-03
power handling (f=480MHz)
-0.2
60
-0.25
50
Power (Watts)
0
50
100
150
200
Temperature of the Part ( °C)
250
300
-0.3
Insertion Loss (dB)
40
-0.35
30
-0.4
20
-0.45
10
-0.5
-50
0
0
25
50
75
100
125
150
Base Plate Temperature (°C)
175
200
225
Insertion Loss Derating:
The insertion loss, at a given frequency, of a group of
couplers is measured at 25°C and then averaged. The
measurements are performed under small signal
conditions (i.e. using a Vector Network Analyzer). The
process is repeated at -55°C and 95°C. Based on
copper as well as dielectric losses, the insertion loss is
computed from -55°C to 300°C.
Power Derating:
The power handling and corresponding power derating
plots are a function of the thermal resistance, mounting
surface temperature (base plate temperature),
maximum continuous operating temperature of the
coupler, and the thermal insertion loss. The thermal
insertion loss is defined in the Power Handling section of
the data sheet.
As the mounting interface temperature approaches the
maximum continuous operating temperature, the power
handling decreases to zero.
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