This paper presents the design of ultra-wideband (UWB)
circular shaped Fractal antenna and its backscattering reduction.
The fourth iterative Circular fractal antenna have been designed
and fabricated on εr = 4.3 and h = 1.53 mm with radius 41 mm. The
antenna offers excellent ultra wideband performance ranging
from 0.80 GHz to 10.68 GHz. The antenna exhibits impedance
bandwidth of 9.88 GHz corresponding to 172.13 % at – 10 dB
return loss points. The lower end frequency of fractal antenna
shifted to 0.8 GHz in comparison to simple patch resonant
frequency 1.446 GHz of same dimension. This indicates the size
reduction of antenna. The experimental radiation pattern of fractal
antenna has been observed nearly omni-directional. The
backscattering reduction of fractal antenna has also been studied.
The fourth iterative fractal antenna exhibits low backscattering.
The effect of superstrate on antenna metallization can be helpful to
tune the low RCS minima in operating band. Such type of
antenna can be used for UWB system, radar and EW
applications.
