Cognitive radio communication is envisaged to be a new paradigm of methodologies for enhancing the performance of radio communication systems through the efficient utilization of radio spectrum. A key enabler for realization of a cognitive communication system is the capability of re-configurability in the underlying hardware and the associated protocol suite. Reconfigurable double C-Slot microstrip patch antenna fed by 50 ohm microstrip line is proposed in this paper. The frequency tuning is performed by switching on and off two patches. The antenna can operate in dual-band or in very wide band mode in 5, 6 and 7\udGHz bands. The wide-band mode can be obtained when both switches are in the ON state with impedance bandwidth of 33.52\ud% from 4.99 to 7 GHz. The total size of the ground plane is 50 x 50 mm2. The proposed antenna verified through both numerical\udsimulation and measurement of an experimental prototype. The antenna achieves a gain of 5 to 8 dBi and radiation efficiency\udabout 80%.
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