This study presents a wideband crossover developed using substrate integrated coaxial line (SICL) technology. The proposed SICL-based crossover isolates the two physically overlapping channels by routing the signal in a middle conductor of SICL through the transmission line created in the top and bottom ground plane using a metalised blind via. An equivalent model is proposed to study the role of substrate height in the proposed crossover. The design methodology is affirmed by fabricating and testing the experimental prototype. The measured results show isolation between channels are more than 19 dB with better than 18 dB return loss and less than 1.2 dB insertion loss from 0.2 to 20 GHz. Owing to the non-dispersive nature of SICL line and simplistic design technique with minimal discontinuities the designed crossover demonstrates low peak-to-peak group delay variation, less than 0.04 ns over the entire bandwidth. The proposed crossover due to its symmetric design provides low path difference of less than 2.45 up to 20 GHz ( up to 10 GHz) without any additional phase compensation technique. Utilization of electromagnetically robust self-packaged components designed in SICL technology provides superior front-end communication system within a small footprint.

中文翻译：

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具有低相位不平衡和群时延的基于SICL的宽带分频

这项研究提出了使用基板集成同轴线（SICL）技术开发的宽带分频器。所提出的基于SICL的分频器通过使用金属化盲孔在顶部和底部接地层中创建的传输线路由SICL的中间导体中的信号，从而隔离两个物理重叠的通道。提出了一个等效模型来研究衬底高度在提出的交叉中的作用。通过制造和测试实验原型来确认设计方法。测量结果表明，在0.2至20 GHz的频率范围内，通道之间的隔离度大于19 dB，回波损耗优于18 dB，插入损耗小于1.2 dB。由于SICL线具有非分散性，且设计技术具有不连续性极小的不连续性，因此设计的分频器显示出较低的峰峰群延迟变化，在整个带宽内小于0.04 ns。提议的分频器由于其对称设计而提供了小于的低路径差 2.45 高达20 GHz（ 高达10 GHz），而无需任何其他相位补偿技术。利用SICL技术设计的抗电磁干扰的自封装组件，可在较小的占地面积内提供出色的前端通信系统。