UWB antenna and LNA receiver simultaneous matching

This paper describes a method used to design an ultra wideband (UWB) receiver antenna and low noise amplifier (LNA) simultaneously using optimization methods. In narrow band (NB) design, the impedance of the LNA or antenna is almost constant, usually matched to 50 or 75 Ohms. Thus, the antenna and LNA are designed independently. In UWB, the antenna impedance is a junction of frequency, and varies greatly. Thus, the designer´s option of designing each subsystem independently is difficult.