This article demonstrates a planar dual-band array antenna for millimeter-wave applications, which has a left-hand circular polarization and a right-hand circular polarization for two operating bands, respectively. By using aperture-fed stacked-curls, the proposed antenna can attain broad axial ratio (AR) bandwidths in both K- and Ka-bands through a single port. Meanwhile, two stacked-curls are designed to rotate in different directions for achieving orthogonal circular polarizations in two bands, respectively. An 8×88\times 8 stacked-curls array antenna is designed and manufactured for verifications. The measured 3 dB AR bandwidths are 11.59% (18.7-21 GHz) in the K-band and 9.93% (26.8-29.6 GHz) in the Ka-band, with reflection coefficient lower than −10 dB. The maximum gain in K- and Ka-bands are 18.59 dB and 18.13 dB, respectively. The proposed antenna can be used for developing compact satellite communication systems.

中文翻译：

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具有独立LHCP和RHCP辐射特性的毫米波平面双频阵列天线


本文演示了一种用于毫米波应用的平面双频段阵列天线，其两个工作频段分别具有左旋圆极化和右旋圆极化。通过使用孔径馈电堆叠卷曲，所提出的天线可以通过单个端口在 K 和 Ka 频段获得宽轴比 (AR) 带宽。同时，两个堆叠卷曲被设计为沿不同方向旋转，以分别实现两个波段的正交圆偏振。设计并制作了8×88×8叠卷阵列天线进行验证。测得的3 dB AR带宽在K频段为11.59%（18.7-21 GHz），在Ka频段为9.93%（26.8-29.6 GHz），反射系数低于-10 dB。 K 和 Ka 频段的最大增益分别为 18.59 dB 和 18.13 dB。所提出的天线可用于开发紧凑型卫星通信系统。