Linearly Polarized Wideband Koch Fractal Antenna for C and X-band Applications

This research article presents a Koch fractal antenna with wideband characteristics. A threefold scaled down 1st order Koch fractal geometry is etched on the central radiator. The proposed antenna operates in the frequency range from 3.6 GHz to 9.5 GHz. The defected ground plane with a rectangular cut is incorporated to further enhance the impedance bandwidth (IBW). The whole geometry is built on a Rogers RT/ Duroid 5880 substrate. The monopole is excited on a line feeding with the best impedance match of $50 \Omega$. The areal compactness of the proposed radiator measures $0.677 \lambda_{0} \times 0.611 \lambda_{0} \times 0.034 \lambda_{0}\left(f_{r}=6.55 \text{GHz}\right)$ and has a −10 dB bandwidth of 90%. The radiator achieves a peak gain measure of 6.8 dBi at 3.7 GHz. Stable radiation characteristics with better X-Pol, covering IBW are observed in this investigation. Hence, the proposed radiator is a fit for C and X-band applications.