What is the need for matching network?
So, if the source and load impedances are not matched, we can lose lots of power. In this example, we have delivered only 33% of the available power to the load. Therefore, if we want to deliver the available power into a load with a non-zero reflection coefficient, a matching network is necessary.
How does an RF match work?
Impedance matching to minimize reflections is achieved by making the load impedance equal to the source impedance. 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.
How is a matching network connected to a source?
Here are some salient points to keep in mind: 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 to think of matching networks in real life?
Alternatively, you can think of a matching network as transforming the output impedance of the source such that it is equal to the complex conjugate of the load impedance. (In real-life circuits the source impedance often has no imaginary part, and thus we don’t need to always refer to the complex conjugate.
How to evaluate the efficacy of a matching network?
To evaluate the efficacy of the matching network, we can run a simulation and then plot the voltage across the load divided by the current flowing into the load, which is equal to the input impedance. (In this case the current flowing into the load is the current through inductor L1.)
How does an impedance matching network work?
From the above figure, it can be seen that the impedance matching network creates a condition in which the source reactance is reson- ated with an equal and opposite load reactance, thus leaving only pure resistance value at the source and the load.