Millimeter-Wave Ultra-Wideband Circularly Polarized OMD Antenna Array Based on Dual-Mode Sequential Rotated Feeding
Chao Wang, Zhixiang Huang, Guanghui Xu, Minquan Li, Guoda Xie, Kaikun Niu, Yingsong Li, Dawei Ding, Wei Wang, Xianliang Wu, Wen-Yan Yin
Abstract
In this article, a novel ultra-wideband circularly polarized (CP) orthogonal magnetic dipole (OMD) antenna array with a dual-mode sequential rotation feeding (SRF) networks is proposed for the millimeter-wave (mm-wave) applications. Above all, a novel OMD concept model is proposed. Subsequently, based on the conceptual model, a planar CP OMD antenna element is designed and analyzed, and its axial ratio (AR) bandwidth is enhanced by using parasitic patches. To further achieve a wider AR bandwidth and a higher gain, a dual-mode SRF network is proposed and designed to form a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4\times4$ </tex-math></inline-formula> CP antenna array. Finally, the antenna array is fabricated and measured to verify the design. The measurement results of the proposed <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4\times4$ </tex-math></inline-formula> CP array show a −10-dB impedance bandwidth of 88.3% (18.15–46.85 GHz) and a 3-dB AR bandwidth of 61.0% (20.5–38.5 GHz) with a peak gain of 16.8 dBic. The proposed antenna array boasts several advantages, such as wide impedance and AR bandwidths and ease of integration, making it suitable for a wide range of applications in fifth-generation (5G) mm-wave communication systems.