论文名称：Phased Array With Switchable Dual-Circular Polarization Based on Subarray for Low-Cost LEO Satellite Communication。本文设计了一款面向低轨卫星通信的低成本K波段相控阵天线。该设计通过使多个辐射单元共享单个T/R通道，大幅减少了T/R组件数量，从而显著降低了系统总成本。为便于后续集成与测试，对子阵列拓扑施加了模块化约束。本方案采用四个模块化子阵列拼接集成的方式构建大规模相控阵。该相控阵进一步设计为支持可切换双圆极化工作模式，从而兼容多种卫星通信网络。通过分析不同内部单元排布引发的相位中心偏移，最终选取与几何中心最吻合的配置方案。基于阵列间耦合评估，建立了大规模辐射性能仿真方法。为验证所提设计，研制了256单元低成本相控阵样机并在全频段内进行测试，同时针对该新型阵列架构开发了近场校准策略。测量结果表明：在±45°扫描范围内，该相控阵旁瓣电平低于-10 dB，且在整个工作带宽内轴比保持在3 dB以下，展现出优异的辐射性能与圆极化特性。

工作主要完成人：侯惠颖，郑斌，程钰间。

论文链接：https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11157894

Abstract—In this article, a low-cost K-band phased array antenna is designed for LEO satellite communication. The design reduces the number of T/R components by allowing multiple elements to share a single T/R channel, thereby significantly lowering the overall cost. To facilitate subsequent integration and testing, modular constraints are imposed on the subarray topology. In this implementation, large-scale phased arrays are constructed by stitching together four modular subarrays. The phased array is further designed to support switchable dual circular polarization (CP) states, enabling compatibility with diverse satellite communication networks. By analyzing the phase center variations caused by different internal element arrange ments, the configuration that best aligns with the geometric center is selected. A simulation method for large-scale radiation

performance is established by evaluating interarray coupling. To validate the proposed design, a 256-element low-cost phased array is fabricated and measured across the entire frequency band. A

near-field calibration strategy is also developed for this new array architecture. The measurement results show that within a ±45◦ scanning range, the phased array achieves sidelobe levels below

−10 dB and maintains an axial ratio (AR) below 3 dB across the full operating bandwidth, demonstrating excellent radiation performance and CP characteristics.

Index Terms—Dual-circular polarization (CP), K-band, low cost, subarray.