团队有关K/Ka双频段线圆极化变化器的成果在IEEE TAP期刊上发表

论文名称为“Single-Layer Dual-Band Linear-to-Circular Polarization Converter With Wide Axial Ratio Bandwidth and Different Polarization Modes”。该工作基于单层结构，在单层介质基片的上下两层金属层上刻蚀了周期性Jerusalem 十字结构和“I”型结构，实现了K/Ka双频段的线圆极化变换。当线极化波通过变换器传输时，在K波段变成LHCP波，在Ka波段变成RHCP波。测试结果显示K/Ka频段的3dB轴比带宽分别为29%和12%，入射角在0°到20°范围内的轴比变化小于1dB，该结构可以满足K/Ka频段卫星通信的应用需求。工作主要完成人有王洪斌、程钰间。论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8668797

Abstract—— A dual-band linear-to-circular polarization converter (LCPC) based on a single-layer dielectric substrate is proposed. The element of the converter consists of two identical metallic layers with a combination of a connected Jerusalem cross (JC) and an “I”-type dipole for each layer. The proposed converter is designed by using an equivalent circuit model (ECM). Left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) beams can be, respectively, generated at K-band and Ka-band excited by a linearly polarized (LP) wave tilted 45° relative to the x- and y-directions of the converter. In addition, the converter covers two operation bands for K-/Ka-band satellite communications with high conversion efficiency and low polarization extinction ratio (PER). After full-wave optimization, the proposed converter is fabricated and measured. The measured results show a good agreement with the simulated ones. Even though there exists a tradeoff between the angular stability and the bandwidth of the dual-band LCPCs, the measured axial ratio (AR) remains stable in the lower operation band and a slight fluctuation in the higher band with the incident angle of 20°.

 Index Terms—Dual band, high conversion efficiency, linear-to-circular polarization converter (LCPC), wide axial ratio (AR) bandwidth.