What's the difference between Z=Z* and Z=Z matching?

Hello everybody

I have a small question,

What's the difference between different types of matching?

I know only two types: Zin=Zc and Zin=Zc* , Is there anyother types?

When we use each?

Please clarify it to me,

Thanks alot in advance,

Ahmad,

Hi Ahmed,

Conjugate matching is used for having maximum power transfer and correct impedance matching is used at the output of power amplifiers, This is because only for this prescribed impedance you will be able to reach the said efficiency.

Regards,
Prakash.

Thanks for reply, but I may understood the first (though don't knowy how it does that) and i didn't understand the second.. can you clarify it again.

Regards,
Ahmad,

z=z is for the far end of a transmission line to prevent reflections and thus produce maximum power transfer.

z=z* is for lumped element circuits and the sending end of a transmission line (where you have to adjust the source impedance).

This latter is often misused. In most cases it produces disastrous side effects such as narrow bandwidth, high distortion, limited power transmission, etc. The limited power transmission is caused by taking the small signal parameters and using them in large signal situations, such as finite power supply voltages on transistors.