A Compact Wideband Dual-Polarized Antenna Using Monolithic Dielectric for 5G Base Station Application

A compact wideband dual-polarized dielectric resonator antenna (DRA) is investigated in this letter. The antenna is formed by a monolithic cross-shaped dielectric block with a rectangular part for support and two pairs of orthogonal metal strips printed on the bottom of the cross dielectric. For demonstration, a dual-polarized prototype antenna with the electrical size of 0.38 λ₀ × 0.38 λ₀ × 0.14 λ₀ has an impedance bandwidth of 16.5% from 3.25 to 3.85 GHz with |S₁₁| < −15 dB covering the N78 band for fifth-generation (5G) new radio. Furthermore, the antenna has a stable gain of 8.5 ± 0.4 dBi across the operating frequency range, demonstrating the high stability of the radiation characteristic for the two radiation modes. All the simulated and measured results for the DRA are given, showing a good agreement.