Self-supported wide-band dipole antennas with a constant gain characteristic

In this paper, the dipole antenna feeding coaxial line is taken up and a method to analyze the input impedance is proposed, where this antenna is supported itself and located over the ground. The method is derived using the equivalent model thought of the feed section as a circular radial line. Numerical simulations using the FDTD and experimental results of a prototype model are shown to confirm the method. It is also shown that this antenna can be achieved to have constant gain characteristics over a wide-band by optimizing geometric parameters