I have a GaN power amplifier of 50 watts and have one 7 element yagi antenna which is operating at 2.45 GHz and there is a output matching network in amplifier. I have to remove that matching network and have to match output impedance of amplifier to the yagi antenna by changing its parameters. So i need to change parameters of yagi antenna in such a way that i get maximum power transfer between amplifier and antenna without any matching network.