This work proposes a novel millimeter-wave (mm-wave) wideband circularly polarized (CP) antenna array for Internet of Things (IoT) applications. The proposed design addresses the issues of having IoT sensors deployed in remote locations or over large geographical regions. Elliptically shaped dielectric resonator antennas (DRAs) are used as array elements to improve radiation characteristics and achieve circular polarization over a wide impedance bandwidth around 28 GHz. Two different sequential-phase corporate feed networks are studied and compared to obtain wider impedance, 3-dB gain, and axial ratio (AR) bandwidths. Furthermore, a ridge gap waveguide technique based on the low-cost PCB technology is adopted to reduce the transmission losses in the considered sequential-phase feed networks. The proposed mm-wave antenna exhibits an impedance bandwidth of 35% (28.1–40 GHz) and 3-dB gain bandwidth of 19.3% (27.6–33.5 GHz). The achieved 3-dB AR bandwidth is 22.6% (27.5–34.5 GHz). The proposed antenna was fabricated and measured, and good agreement between measured and simulated results was obtained. The reported results show that the suggested wideband CP mm-wave antenna has a lot of promise in preventing polarization mismatch losses between IoT devices and satellites caused by their varying orientations.

中文翻译：

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用于物联网的宽带圆偏振毫米波 DRA 阵列


这项工作提出了一种用于物联网（IoT）应用的新型毫米波（mm-wave）宽带圆极化（CP）天线阵列。拟议的设计解决了将物联网传感器部署在偏远地区或大地理区域的问题。椭圆形介质谐振器天线 (DRA) 用作阵列元件，可改善辐射特性并在 28 GHz 左右的宽阻抗带宽上实现圆极化。研究并比较了两种不同的顺序相位公司馈电网络，以获得更宽的阻抗、3dB 增益和轴比 (AR) 带宽。此外，采用基于低成本PCB技术的脊隙波导技术来减少所考虑的顺序相位馈电网络中的传输损耗。所提出的毫米波天线的阻抗带宽为 35% (28.1–40 GHz)，3dB 增益带宽为 19.3% (27.6–33.5 GHz)。实现的 3dB AR 带宽为 22.6% (27.5–34.5 GHz)。所提出的天线被制造并测量，测量结果与仿真结果之间具有良好的一致性。报告的结果表明，所建议的宽带 CP 毫米波天线在防止物联网设备和卫星之间因方向不同而导致的极化失配损失方面具有很大的前景。