A Dual-Band Dielectric Resonator Antenna with T-Shaped Ground Plane Slots for Millimeter-Wave Applications

This paper presents the design and analysis of a dual-band rectangular Dielectric Resonator Antenna (DRA) operating in millimeter-wave frequencies. The dual-band operation is realized by introducing T-shaped holes in the ground plane, enabling the antenna to operate effectively from 29.8 GHz to 31.6 GHz for the lower band and 36.7 GHz to 40.9 GHz for the upper band. Simulated using CST Studio, the antenna features a high-permittivity dielectric material with dimensions of 10 mm × 1.95 mm × 1.00 mm, complemented by Rogers RT/duroid 5880 substrate and a ground plane designed to enhance signal transmission while minimizing interference. The antenna achieved resonance frequencies at 30.6 GHz and 37.8 GHz, with bandwidths of 1.88 GHz (6.12%) for the lower band and 4.18 GHz (10.76%) for the upper band. The antenna achieved return losses of –30.8 dB and –50.3 dB for the respective bands and high gains exceeding 7 dBi, critical for effective Millimeter Wave (mmWave) communications. The antenna efficiency reached 88% and 95% in the lower and upper bands, respectively, with a Voltage Standing Wave Ratio (VSWR) of 1, an indication of excellent impedance matching. The antenna exhibited broadside radiation pattern, making it suitable for applications in satellite and wireless communications, radar systems and 5G technologies.