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What is conjugate impedance matching?
To transfer maximum power, the source and the load impedance should be the complex conjugate of each other—this is called conjugate matching. To minimize reflections, the two impedances are kept equal. This type of impedance matching is called reflectionless matching.
Why is impedance matching important?
Our goal with impedance matching is to make the load impedance seem to look like the source impedance. Matching the impedances throughout the circuit yields a desired low voltage standing wave ratio (VSWR). Low VSWR circuits transfer the maximum amount of power from the source to the load.
How do matching networks work?
A matching network is connected between a source and a load, and its circuitry is usually designed such that it transfers almost all power to the load while presenting an input impedance that is equal to the complex conjugate of the source’s output impedance.
How is a conjugate match different from a reflection less match?
A conjugate match is different from a reflection-less match when either the source or load has a reactive component. If the source has a reactive component, but the load is purely resistive, then matching can be achieved by adding a reactance of the same magnitude but opposite sign to the load.
When to use complex conjugate matching in impedance matching?
If the source impedance, load impedance and transmission line characteristic impedance are purely resistive, then reflection-less matching is the same as maximum power transfer matching. Complex conjugate matching is used when maximum power transfer is required, namely where a superscript * indicates the complex conjugate.
When to use complex conjugate matching in power transfer?
Complex conjugate matching is used when maximum power transfer is required, namely = ∗ where a superscript * indicates the complex conjugate. A conjugate match is different from a reflection-less match when either the source or load has a reactive component.
Are there any myths about the conjugate match?
Conjugate Match Myths Steve Stearns, K6OIK Technical Fellow Northrop Grumman Information Systems Electromagnetic Systems Laboratory San Jose, California [email protected] [email protected] 2S.D. Stearns, K6OIK ARRL Pacificon Antenna Seminar, Santa Clara, CA October 14-16, 2011 Topics SWR variation on lossy lines