Compact Magneto-Electric Dipole Director Loaded High-Gain Dual-Polarized Magneto-Electric Dipole Antenna

• Published in: IEEE antennas and wireless propagation letters 2024-07, Vol.23 (7), p.2130-2134
• Main Authors: Feng, Li Ying, Zhang, Chao Qun
• Format: Article
• Language: English
• Subjects: Antenna design; Antenna radiation patterns; Aperture antennas; Bandwidth; Communications systems; Dipole antennas; Dual-polarized antenna; dual-polarized director; Electric dipoles; Gain; high front-to-back ratio; High gain; Horizontal polarization; Impedance; Loaded antennas; magneto-electric (ME) dipole; Metal plates; Reflector antennas
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2024.3382879

This letter introduces a novel high-gain, dual-polarized magneto-electric dipole (ME-dipole) antenna that incorporates a compact dual-polarized ME-dipole director for the first time. The innovative director uses a crossed open cavity with four horizontal metal plates mounted on its open ends, resulting in dual-polarized magnetic and electric dipole directors. The antenna is fed by two cross-positioned Γ-shaped probes of varying heights, providing ±45° polarization. The measured impedance bandwidths for ports 1 and 2 are 34.63% (2.34-3.32 GHz) and 36.03% (2.23-3.21 GHz), respectively, with a 31.35% overlap. The antenna achieves an average gain of 13.7 dBi for port 1 and 13.6 dBi for port 2, with peak values of 14.13 and 14.07 dBi, respectively. Compared with the conventional dual-polarized ME-dipole antenna without loading a director, the proposed design achieved a gain enhancement of more than 4.6 dB. Furthermore, high isolation of over 20 dB between the two ports and a stable radiation pattern and an impressive front-to-back ratio are maintained. These features make the proposed antenna an excellent choice for use in 5G communication systems.