Frequency and bandwidth reconfigurable monopole antenna for cognitive radios

A miniature frequency bandwidth reconfigurable antenna is presented. Four slots and a ring slot resonator are integrated to the ground plane of an UWB antenna in order to achieve frequency reconfiguration, maintaining the original size unchanged. The proposed antenna is capable of adjusting both the frequency and the bandwidth by using switches to control the electrical length of the slots, offering thus pre-filtering functionality. Antenna performance obtained from simulation and measurement results shows a fair agreement, which validates the proposed design approach. The antenna is potentially suitable for wireless communication and cognitive radio.