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50 Ohms "Real Resistive" impedance a Misnomer?

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July 17th 03, 12:17 PM

Dr. Slick

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(Tom Bruhns) wrote in message om...

When you are trying to design a 9 element Chebychev low-pass
filter, it becomes important to test it will a 50 Ohm dummy load that
doesn't drift all over the place at higher frequencies.

RFSim99 lets you easily see how (in)sensitive such a filter is to load
resistance and reactance. And if you're going to use it in a
transmitting (or receiving, for that matter) application, it might be
good to know that, since it may be rather difficult to control either
the load or the source impedance, especially over a wide frequency
range.

RFSim99 seems to be a good program, but after 2 years of ADS and
how poorly it predicts how the "bench" should react (esp. at 1-2 GHz),
I'll stick to actual prototypes for now.

Slick

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