Broadband Circularly Polarized Crossed Dipole Antenna Loaded with Magneto-Electric Dipole
Zhuopeng Wang,
Xin Zhang,
Haoyu Fang,
Ao Ni and
Yanhui Cheng
A right-hand circularly polarized (RHCP) crossed dipole antenna with wide impedance and axial ratio bandwidth is developed. The antenna is composed of a pair of crossed dipoles, four parasitic patches, a metal reflecting cavity and 12 metal support posts. The four parasitic patches and 12 metal support posts together constitute two pairs of magneto-electric dipoles. By using a quarter wavelength phase delay ring on the crossed dipole, the 90° phase difference between the upper and lower arms is obtained, thereby realizing circularly polarized radiation. By adding slotted parasitic patches, grounded metal posts, and modifying the cavity structure, the circular polarization performance of the antenna is improved. The measurement results show that the antenna with a compact size, low cost obtains 64.5% of impedance bandwidth (1.85-3.61 GHz) and 59.6% of axial ratio bandwidth (1.92-3.55 GHz), and has stable pattern and gain in the operating bandwidth, highlighting significant potential for future applications in sub-6 GHz 5G applications.
