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Abstract
In this paper, we have proposed a compact UWB antenna with PI-shaped (π-shaped) matching stub for UWB applications. The antenna has a modified trapezoidal radiating patch, a PI-shaped matching stub, CPW feeding, and two steps for impedance matching. A prototype antenna printed on the dielectric substrate of FR4 has dimensions of 20 mm by 20 mm. The proposed antenna exhibits a voltage standing wave ratio (VSWR) of less than 2.0, and the figure-of-eight radiation patterns with gain from 2 to 3.5 dBi in a frequency range from 3.1 to 10.6 GHz. To evaluate the dispersion performance of the designed UWB antenna, the path loss (|S21|) and the group delay are simulated and measured. Details of the proposed antenna design and the simulated and measured results are presented and discussed.