A Broadband Dual‐Polarized Magnetoelectric Dipole Antenna With High Isolation

ABSTRACT A broadband, low‐profile, and dual‐polarized magnetoelectric dipole (MED) antenna with high isolation is proposed for in‐band full‐duplex applications. The proposed MED antenna is configured with a cross‐dipole, copper cylinders, instead of the traditional vertical metal walls, and a ground. Two different feeding methods, a T‐shaped strip connected with a T‐junction power divider for Port 1 and a microstrip‐to‐slot coupling structure for Port 2, are designed to excite dual‐polarized radiation. Compared to the previous works, the height of the MED antenna is from the conventional about 0.25 λ 0 to 0.15 λ 0 , where λ 0 is the wavelength in free space at the center operating frequency. The broadband, dual‐polarized, and high port‐to‐port isolation characteristics are reserved. A designed prototype is fabricated, and the measured results demonstrate an overlapped −10‐dB impedance bandwidth of 1.73–2.70 GHz (43.8%), the port‐to‐port isolation of 44.1 dB, the average realized gains of 8.89 and 8.49 dBi, and the average radiation efficiency of 86.1% and 87.1% for Ports 1 and 2, respectively. These characteristics make the proposed antenna a promising candidate for in‐band full‐duplex base station systems.