Planar Monopole Antenna With Dual Interference Suppression Functionality

A compact microstrip-fed ultrawideband (UWB) printed monopole antenna is described that possesses attributes of dual notched functionality, wide impedance bandwidth (IBW), and circular polarization (CP). The antenna consists of an annular-ring radiating patch with a pair of Y-shaped resonant elements that are embedded inside the patch. The antenna's ground plane is truncated in the shape of a trapezoidal structure resting on a rectangle to extend its IBW performance. Located above the truncated ground plane is an inverted U-shaped parasitic element, and a semi-circular notch is etched in the ground plane in the vicinity of the annular-ring patch to further enhance the antenna's IBW.