Impedance Matching and Transformation

Impedance Matching and TransformationMatching the source and load to the transmission line or waveguidein a general microwave network is necessary to deliver maximum powerfrom the source to the load. In many cases, it is not possible to choose allimpedances such that overall matched conditions result. These situationsrequire that Matching networks be used to eliminate or waveguide to termination Matching networkT-line or waveguide to t-line or waveguide Matching networkDepending on the application, Matching may be required over a band offrequencies such that the bandwidth of the Matching network is animportant design parameter. If the load Impedance varies over a givenrange, a Matching network which can be adjusted or tuned as necessary.

Lumped Element Matching Network for R Lo > Z The r eac tance jX and suscept ance jB may be a ny c ombin atio n of c ap ac it ors (X < 0, B > 0) or induct ors (X > 0, B < 0) .For a matched ne twork, the input imp edan ce Z in must be equal to Z o which gives Mul tipl ying o ut thi s equa tion and equa ting the real and imagi na ry terms on

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  Impedance, Dean, Imp edan ce

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