An UWB to four sub-bands frequency reconfigurable CPW-fed disc monopole antenna

An UWB to four sub-bands frequency reconfigurable CPW-fed disc monopole antenna is presented. A single pair of ring slot resonators is inserted to the CPW ground plane to achieve the reconfiguration, maintaining the original size unchanged. The proposed antenna is capable of switching between a wide operating band of 2.3 GHz - 10.5 GHz and four different sub-bands, offering pre-filtering functionality to the system. Switches were employed at specific locations in the resonator to change its effective electrical length, hence forming different filter configurations. Antenna performances obtained from simulation and measurement results show a good agreement, which validates the proposed design approach. The antenna is potentially suitable for applications requiring dynamic band switching such as cognitive radios.