Analysis of Different Feeding Techniques of Butterfly-Shaped Patch Antenna with Defected Ground for UWB Application

A miniaturized butterfly-shaped microstrip patch antenna is proposed for unlicensed millimeter wave band applications. The overall dimensions of the proposed antenna are (20 × 18 × 1.6) mm3 or (3.93 × 3.54 × 0.314)λ03 with rectangular defected ground structure, which is etched on the ground plane to improve its performances. This configuration achieved an ultra-wide bandwidth (UWB) of 7 GHz (26%) and 22 GHz (37.9%) with radiation efficiencies of...