A New Method of Antenna Height Reduction Based on Half-Sized Full-Wave Dipole

This communication presents a new strategy to reduce antenna height. The basic idea is to replace the half-wave dipole whose input impedance will be greatly decreased due to the close proximity to the metal reflector with a full-wave dipole with a large input impedance. Furthermore, we move the current null of the full-wave dipole out of the central area and rotate one of the arms 180° to obtain a half-sized dipole with an input impedance of nearly
$50 \Omega $
. Its transverse size is the same as the half-wave dipole, and its profile is only
$0.05\lambda b _{0}$
(
$\lambda b _{0}$
is the free-space wavelength at the center frequency). Finally, we improve its structure, obtain a wideband counterpart, and expand the wideband element into a dual-polarized subarray. The height of the dual-polarized, wideband sub-array is only
$0.08\lambda b _{0}$
. Simulated and measured results show that such low profile, a half-sized full-wave dipole has comprehensive application foreground and spread value in today’s communication system.