Journal of Microwave Engineering and Technologies Review Article
Dual-Band Circularly Polarized Cylindrical Dielectric Resonator MIMO Antenna with Dual Orthogonal Feeding for 5G mm-Wave Applications
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Abstract
A dual orthogonally fed cylindrical dielectric resonator antenna (CDRA) is proposed for millimeter-wave 5G applications. In the proposed design, a smaller cylindrical dielectric resonator is extracted from the primary resonator without degrading the antenna performance. The antenna is fabricated on a Rogers substrate with dimensions of 30 × 15 × 0.254 mm³ and a relative permittivity of 2.2. The primary CDRA has a radius of 3.8 mm and a height of 1.95 mm, while the extracted resonator is realized using Al₂O₃ with dimensions of Rs = 1.35 mm and h = 1.95 mm. The proposed antenna exhibits a wide impedance bandwidth covering 27.05–31.55 GHz and 32.14–34.9 GHz. It achieves elliptical polarization with axial- ratio bandwidths of 27.42–27.85 GHz and 34.27–34.9 GHz. Furthermore, a peak simulated gain of 8.89 dBi and a high total radiation efficiency of up to 98% are obtained. The dual- polarized differential feeding enhances impedance matching, radiation performance, and port isolation better than −20 db. Owing to these features, the proposed antenna is a promising candidate for high-frequency 5G millimeter-wave communication systems. Reliable high-frequency signal transmission is supported by the small size, broad operational bandwidth, and polarization properties. These characteristics make the suggested antenna appropriate for new millimeter-wave 5G communication systems that need high-performance, compact, and effective antenna solutions.
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