基于圆极化漏波阵的罗特曼透镜多波束天线设计

周子源; 曹元熙; 闫森

doi:10.3969/j.issn.1674-7135.2023.04.013

基于圆极化漏波阵的罗特曼透镜多波束天线设计

西安交通大学，西安 710049

基金项目: 陕西省重点研发计划（编号：2022GY-114）

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出版历程
- 刊出日期: 2023-08-24

A circularly polarized leaky-wave antenna based on Rotman lens multi-beam antenna

Xi’an Jiaotong University，Xi’an 710049，China

摘要

摘要: 文章提出了一种具有无源波束扫描能力的平面圆极化多波束天线。该天线由基于基片集成波导(substrate integrated waveguide, SIW)的漏波天线阵列和罗特曼透镜馈源网络组成。其中漏波天线作为天线辐射体，通过在SIW传输线上加载90°顺序旋转的非谐振辐射缝隙，实现了圆极化的辐射特性。为了实现低成本的波束扫描能力，使用罗特曼透镜作为天线的馈电网络。该天线设计采用双层结构，通用将漏波天线阵列置于罗特曼透镜上层，实现了天线的小型化。经仿真验证，该天线可在9.5GHz~10.5GHz的工作频带范围内，实现良好的阻抗匹配及±44°的圆极化波束扫描能力，并且每个波束均可在3dB波束宽度内实现小于3dB的轴比。
- 漏波天线 /
- 多波束天线 /
- 圆极化天线 /
- 罗特曼透镜
Abstract: A planar circularly polarized multi-beam is proposed to achieve passive 1D beam scanning capability. The antenna is composed of a substrate integrated waveguide (SIW) leaky-wave antenna (LWA) array and a Rotman lens antenna beamforming network (BFN). The circularly polarized radiation characteristic is realized by the four non-resonant slots, which are placed along the SIW transmission line with a distance of around λg/4. The low cost passive beam scanning is realized by the SIW Rotman lens BFN. The LWA array is stacked on the top of the Rotman lens BFN to achieve the antenna miniaturization, several coupling slots are used to transform the field from the Rotman lens BFN to the LWA array. The simulated results show that the proposed design can achieve 9 beams with ±44° beam scanning range within the operating bandwidth of 9.5GHz~10.5GHz. The axial ratio of the beams is below 3dB in the 3dB beamwidth.
- leaky-wave antenna /
- multi-beam antenna /
- circularly polarized antenna /
- Rotman lens

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