A millimeter-wave (mm-wave) broadband circularly polarized (CP) magneto-electric (ME) dipole array antenna is proposed. The antenna element consists of a ME dipole, a direct T-shaped probe, and a pair of shorted parasitic elements. The shorted parasitic elements are employed to ensure a considerable expansion of the 3 dB axial ratio (AR) bandwidth to lower frequencies. As a result, the ME dipole antenna element achieves a wide overlapped AR/impedance bandwidth of 56.89% (22.45–40.3 GHz). Based on the proposed CP antenna element, a 2 × 2 CP array antenna that incorporates an improved X-shaped power divider network is developed. A prototype of the 2 × 2 CP array antenna is fabricated and experimentally verified. The measured results indicate that a −10 dB impedance bandwidth of 50.39% (23.9–40 GHz) and a 3 dB AR bandwidth of 50% (24–40 GHz) are achieved, forming a broad overlapped AR/impedance bandwidth of 24–40 GHz, which covers most of the current mm-wave 5G bands. Moreover, a peak gain of 14.88 dBic is also observed. Thus, the demonstrated antenna with broadband CP operation and good radiation performance can be an excellent candidate for 5G mm-wave applications.
A broadband circularly polarized magneto-electric dipole array antenna for 5G millimeter-wave applications
Note: This paper is part of the APL Special Collection on Advances in 5G Physics, Materials, and Devices.
Son Trinh-Van, Thai Van Trinh, Youngoo Yang, Kang-Yoon Lee, Keum Cheol Hwang; A broadband circularly polarized magneto-electric dipole array antenna for 5G millimeter-wave applications. Appl. Phys. Lett. 12 July 2021; 119 (2): 023503. https://doi.org/10.1063/5.0053144
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