To reduce the area occupied by delay lines for the 5G sub-6-GHz frequency band, a 3-D rolled-up structure is presented in this letter. According to the rules proposed in this letter, a conventional planar interdigital delay line is rolled up, transforming the initially planar device into a 3-D spiral geometry. When rolling the device into 1 turn, the area occupied by the rolled-up interdigital delay line is reduced by over 65% while maintaining similar performance to the unrolled device. From 1 to 6 GHz, the return loss of the input and outputs port is greater than 13.1 dB, and the insertion loss is less than 3 dB. The group delay is 1.8 ns±5% over the operating band.

中文翻译：

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用于 5G 低于 6 GHz 频段的相控阵系统的 UWB 3-D 汇总延迟线

为了减少 5G sub-6-GHz 频段的延迟线占用的区域，本文介绍了一种 3-D 卷起结构。根据这封信中提出的规则，传统的平面叉指延迟线被卷起，将最初的平面器件转换为 3-D 螺旋几何形状。当器件卷成 1 圈时，卷起的叉指延迟线占用的面积减少了 65% 以上，同时保持了与展开器件相似的性能。从1到6GHz，输入输出端口的回波损耗大于13.1dB，插入损耗小于3dB。在工作频带内群延迟为 1.8 ns±5%。