Maximum Power
The maximum transfer of power from a source to its load requires that the load impedance be matched to the source impedance. This applies to both DC and AC circuits.In AC circuits (RF is AC), the source or load (or both) can be a complex impedance. A complex impedance consists of a real part (resistance) and an imaginary part (reactance). In an RF circuit, the load impedance must be the complex conjugate of the source impedance in order for optimum power transfer to occur.
- For Maximum average power transfer to a load impedance ZL we must choose ZL as the complex conjugate of the Thevenin impedance ZTh.
Example:Calculate the resistive load needed for maximum power transfer and the maximum average power.
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