International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (IJAREEIE)
The proposed micro strip-feed antenna mainly consists of Circular Monopole Antenna (CMA) with defected ground structure for cognitive radio application is presented. The proposed antenna uses FR-4 substrate having thickness of 1.6mm and dielectric constant of 4.4. This antenna achieves an enhanced impedance bandwidth of 2.98GHz. Most of the work in cognitive radio domain has been done in the frequency range of 3.1GHz to 10GHz, but this paper presents a CMA operating over frequency band of 0.6GHz to3.58GHz.