A simple frequency reconfigurable microstrip patch antenna for wireless communication

A reconfigurable microstrip antenna with switchable frequency is proposed. The proposed antenna has a simple structure, consisting of a square radiating patch and parasitic conductor of rectangular shape. PIN diodes switches are introduced to provide to operate antenna either 2.2 GHz or 2.45 GHz depending on the state of the diodes PIN switches. Very good matching is achieved for the two resonant frequencies. Simulated and measured parameters of the antenna are presented and it is demonstrated that the radiation patterns remain essentially unaffected by the frequency tuning.