Dual-Broadband Dual-Polarized Folded Dipole Antenna with Stable Radiation Pattern

A dual-broadband folded dipole antenna with stable radiation performance and two polarizations is presented. To generate dual-polarized radiation performance within a wide frequency band, two pairs of folded dipoles are fed through slot lines and 50 Ω coaxial cables. To generate a notched band which is utilized to separate the wide working band of the folded dipole antenna into a low-frequency band and a high-frequency band, a cross-shaped strip is utilized and embedded upon the folded dipoles. To dramatically enhance the higher operating band, parasitic patches are extra loaded above the cross-shaped strip. In the presented design, two wide frequency bands of 46.8% (1.67–2.69 GHz) and 49.4% (3.2–5.3 GHz) are realized. In addition, the measured gains and HPBWs remain stable within the range of 8.6±0.7 dBi and 67±5° in the lower band, as well as 9.1±0.7 dBi and 69±7° in the higher band.