A Compact Monolithic Dielectric Dual-Polarized Magneto-electric Dipole Antenna

Abstract

A compact dual-polarized magneto-electric (ME) dipole antenna is investigated in this letter. The antenna is formed by a monolithic cross-shaped dielectric block with a rectangle part for support and two pairs of orthogonal metal strips printed on the bottom of the cross dielectric. In the antenna design, the dielectric plays a role as a magnetic dipole (MD) while the metal strips are equivalent to an electric dipole (ED). For demonstration, a dual-polarized prototype antenna with the electrical size of $0.38\lambda_{0}\times 0.38\lambda_{0} \times 0.14\lambda_{0}$ has an impedance bandwidth of 14.1% from 3.25 to 3.85 $\text{GHz}$ with $\vert S_{11}\vert < -15\ \text{dB}$ covering the N78 band for fifth-generation (5G) New Radio (NR). Furthermore, the antenna has a stable gain of $8.5 \pm 0.4\ \text{dBi}$ across the operating frequency range, demonstrating the high stability of the radiation characteristic for the two radiation modes.