A Wideband Low-Profile Dual-Polarized Hybrid Antenna Using Two Different Modes

The fusion of dipole and patch antennas is proposed to achieve a wide band and a low profile. By loading parasitic elements, the hybrid modes of dipole and patch are excited simultaneously with the same feeding and shared aperture. Employing a double-layer-metal artificial magnetic conductor (AMC) to replace PEC as the reflector, the height is reduced from 22.5 mm (0.165 lambda at 2.2 GHz) to 17.5 mm (0.128 lambda). Two shorting pins are loaded between the radiator and the reflector ground to improve the isolation within the whole band. A prototype of the proposed antenna with double-layerAMCis fabricated and measured. The measured results show that the proposed antenna has a wide impedance bandwidth of 1.68-2.84 GHz (1.16 GHz, 51.3%) and high isolation of more than 25.5 dB. In addition, a stable gain of 8.8 +/- 0.2 dBi and a stable radiation pattern with a half-power beamwidth of 59.6 degrees +/- 3.45 degrees are achieved without any ground walls.