First, I want to thank you my friend for your answer. Actually, I know about S-parameters, using smith chart and impedance matching techniques. However, we have not covered the amplifier design in RF frequency domain in university (It was a master course). Although, I am familiar with the transistors, I just do not know how to find input impedance of transistor (in case that the transistor do not have any resistance value) as I stated above in order to realize the matching. That is why I am having difficulties. I will consider your offer using GALI and GVA series. Again many thanks for your assistance and many thanks to BigBoss. I think I figured out how to use these files.