Broadband microstrip antenna design with the simplified real frequency technique

A new approach is proposed to increase the bandwidth of microstrip antennas by designing the impedance matching network with the simplified real frequency technique. The most significant feature of this numerical technique is that it does not require any analytical description of the antenna and generator, the measured or simulated impedance data are processed directly. Furthermore, neither an a priori choice of a matching network topology nor an analytic form of the system transfer function is needed. The matching network realized with this technique is generally simple and gives superior gain properties compared to that obtained by other methods. Two representative design examples of microstrip antennas with different bandwidth show the validity of the design procedure