Re: Attenuators - theory and the design of.
There is a formula for solving cubics but it is very complicated and probably rarely used.
You might be better doing complex algebra (which is no more difficult than real algebra) and get a complex formula for each impedance (unknown) in the network in terms of source and load (knowns). Then simply do complex arithmetic. If you use a common attenuator design (e.g. pi) then you may find the formula already written out. Doing this with separate R and X's just makes everything more complicated.
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