Ultra wideband antenna of two bow-tie unipoles

In this paper novel ultra wideband (UWB) antenna designs suitable for ceiling-mount base station and small terminal applications are presented. Two different designs of antenna arrays employing two triangular radiators above a ground plane have been investigated. In the first design, triangular unipoles are settled parallel one to each other at the distance of a half wavelength at the 3 GHz. In the second design the same radiators are tilted to form a conical like structure. The in-phase excitation of the unipoles was performed by a section of the microstrip line which is centrally fed by a coaxial probe from the opposite side of the ground plane. The input impedance and radiation patterns of both antennas are simulated and measured. In the frequency range 0.8¿5 GHz the VSWR was less than 2. have shown mobile base station and small terminal applications.