Hi Guys
 I had a question on matching. What is the purpose of matching? Well, the following is my calculation.
 Suppose we have a perfect matching for 1mW for 50 ohms.
 Then the voltage at the input points is
 V^2/(2*50)=10^-3,
 V=0.316 V.

Well, let's suppose there is a resistor of 10^5,
then the reflection coefficent is gamma=(10^5-50)/(10^5+50)=1-1*10^-3.
 So the power at the input point is
 (1-gamma^2)*10^-3=2*10^-6.
So the voltage at the input is
 V^2/(2*10^5)=2*10^-6
 V=0.63V
 So in the dismatch case, the voltage is actually twice the input voltage for matching case. I am very confuse about this. Can anyone explain what happened here. In some applications, maximum voltage is better than maximum power, so why do you have to have power match in all the place from antenna to LNA.
 Thank you