Dual-band cylindrical DRA with concentric slot rings for 8–16 GHz microwave and 24–30 GHz 6G mmWave applications

This paper presents a novel dual-band cylindrical dielectric resonator antenna (DRA) integrated with concentric slot rings, designed for advanced wireless systems. The antenna operates over two distinct frequency ranges: 8–16 GHz (microwave) and 24–30 GHz (6G mmWave), offering wide impedance bandwidths of 8 GHz and 6 GHz, respectively, with reflection coefficients below −10 dB across both bands. The unique integration of the cylindrical DRA and concentric slot rings enables independent excitation of multiple resonant modes, ensuring stable Eθ- and Hϕ-plane radiation characteristics and efficient mode separation. Simulation and measurement results show excellent agreement, with stable radiation patterns and peak gains of 5.5–6 dB in the microwave band and 7.5–8.5 dB in the mmWave band. The compact and easily integrable structure represents a significant improvement over conventional dual-band antennas, offering versatile multiband operation well-suited for high-capacity microwave links and emerging 6G mmWave communication applications.