Ground Plane Effect on the Performance of a Butterfly-Shaped UWB Monopole

The butterfly-shaped monopole antenna proposed has provided good impedance matching across the UWB band of 3.1-10.6 GHz. The antenna design consists of a novel butterfly-shaped monopole above the ground plane. The antenna has two circular or elliptical wings which are connected to the two edges of a conducting plate. The wings may form different angles with the ground plane. The radiation patterns for the proposed antenna have been studied in detail in terms of the co- and cross-polarization performance in the x-z and y-z planes. Stable radiation performance over the entire UWB frequency range has been achieved. The design has been validated by both simulations and measurements. Also, this antenna is capable of providing high gain and transmitted pulses with little distortion for UWB applications.