A polarization diversity antenna by printed dipole and patch with a hole

Uplink diversity reception is mandatory for base station antennas in order to decrease multipath fading and to compensate for power unbalance between uplink and downlink. Mobile telephone services began with vehicular mounted mobile terminals which radiate vertical components. Recently, everyone uses a handset placed near the ear at a tilt angle. This operating condition results in an increase in the horizontal radiation component in the uplink, and polarization diversity is effective for diversity systems. The polarization diversity antenna using vertical and horizontal components has the merit of minimizing the antenna installation space, and has been adopted for Japanese cellular systems. This paper proposes a novel and compact diversity antenna element consisting of a printed dipole for vertical polarization and a patch with a hole for the horizontal component (see Kuga, N. and Arai, H., IEICE Technical Report, vol.AP2000-78, 2000). We analyze this polarization diversity antenna by the FDTD method to optimize its antenna parameters.