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Design >> RF Design >> Conjugate Matching in presence of Complex Zo
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Message started by Hammad33 on Feb 18^th, 2015, 10:01am

Title: Conjugate Matching in presence of Complex Zo
Post by Hammad33 on Feb 18^th, 2015, 10:01am

Consider a source with impedance (complex) Zs, then a transmission line with characteristic impedance (complex) Zo and the a load (complex) Zl.
How can we achieve a conjugate match between source and load for max. power transfer in this case?

P.S the case with real characteristic impedance Zo is relatively simple known to me.

Title: Re: Conjugate Matching in presence of Complex Zo
Post by weber8722 on Feb 27^th, 2015, 10:17am

Hi,

where a complex impedance is coming from does NOT matter! Apply the usual conj complex impedance to get power match, that's it.
Maybe best think that you can create a TRL eqivalent circuit, so it obviously does not matter which element comes physically from what (like being part of the line or maybe being an smd component).
One difference is that for real line power match and flat frequency response, having no reflections fit together.
But in general conj matching can be done only for narrow bands.

Bye Stephan