A modified sierpinski gasket triangular multiband fractal antenna for cognitive radio

This piece of writing describes about a modified Sierpinski gasket fractal multiband antenna for cognitive radio applications. This proposed new microstrip modified triangular fractal antenna having multiband behavior in five different resonant frequencies 11.58GHz, 14.15GHz, 20GHz, 30GHz and 35GHz respectively that covers the frequency bands such as X band(8-12GHz), Ku band(12-18GHz), K band(18-26.5GHz), Ka band(26.5-40GHz). This antenna have certain advantages like compact(30×30mm), high directivity(8.15-11.86 dBi) and gain(3.2-8.6dBi). And also the analysis was carried out for five different resonant frequencies to synthesize the antenna parameters such as radiation pattern, gain and directivity. The output results prove that this one is well suitable for spectrum sensing in cognitive radio.