A Compact Dual-Polarized Endfire Dielectric Resonator Antenna for 5G Millimeter-Wave Terminal

Current millimeter-wave (mm-Wave) endfire dielectric resonator antennas (DRAs) are limited to single polarization, highlighting the need for dual-polarized operation to fully leverage DRA advantages. Thus, in this letter, a compact dual-polarized endfire DRA array was proposed, and printed circuit board technology is used for high integration. The antenna element is initially designed to incorporate two orthogonal DRA modes, corresponding to vertical polarization (VP) and horizontal polarization (HP) for operation. Furthermore, to enhance the bandwidth of both polarizations, the corresponding cavity mode and slot mode are introduced, which are combined with the corresponding DRA mode for wideband work. VP and HP elements share the same structure, showing a compact size. Based on the element, a four-element array is designed and fabricated. The test results show that an overlapping bandwidth of 24.1 GHz to 29.6 GHz is realized. Besides, a peak gain of 10.3 dBi and 9.8 dBi for VP and HP is achieved, respectively. Moreover, both VP and HP enable beam scanning. From the above observed characteristics, it can be seen that the proposed design is promising for future 5G mm-Wave terminal applications.