I am trying to understand S Parameters for a RD00HHS1 transistor.
The S11 parameters listed in the datasheet are as follows:
10 MHz 1.002 (mag) -3.6(ang)
30 MHz 1.003 -9.9
50 MHz 1.005 -16.8
100 1.007 -33.5
150 0.989 -49.8
I'm trying to estimate the input impedance at 0.475MHz. But I am uncertain
what it means when the mag is greater than 0.999.
Using the 10 MHz S11 value because it's available I get:
Gamma = 1.002 = (ZL-50)/(ZL+50) --> ZL= -50050 ohm impedance or a VSWR of
negative 1001:1.
What am I doing wrong? What does this mean?
My other attempts at calculating input Z also result in negative impedances
in linear form like -50.58-1589j
My RF books do not seem to say anything about this.
Kb3x
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