Design of Super-wide Band Antenna with Single Notch Characteristic

In this paper, a trapezoid shape planner monopole antenna for super-wideband (SWB) application is presented. The proposed monopole antenna is fed with the rectangular tapered 50-Ohm line. The ground shape is defected, like a semicircle. The antenna provides resonance frequency from 1.4 GHz to more than 90 GHz with return loss less than -10 dB. The compact size of the proposed design is $57 \times 34 \times1$ mm $^{\mathbf{3}}$. The substrate of the proposed design is F4B having $\varepsilon r$ 2.65. Two rectangular ring resonators were employed near the feed line that eliminates the narrowband i.e. X band in SWB range. The impedance bandwidth of the antenna is 193.8% and bandwidth ratio is 64.2:1.