This paper presents wideband split-ring antenna arrays based on substrate integrated waveguide (SIW) for Ka-band (26.5–40 GHz) applications. The antenna array is fed by a 2.92 mm coaxial connector (K-connector) and the power is equally distributed to each split-ring resonator. The designed coplanar waveguide (CPW), SIW, CPW-to-SIW transition, coaxial-to-CPW transition, and two-stage SIW power divider are described in detail. By using a thin Rogers 6002 substrate with silver epoxy-filled vias, a transition prototype is designed, fabricated, and tested in a back-to-back configuration. A wideband split-ring resonator is developed as a single element and four possible arrangements of antenna arrays are introduced. By combining the designed components and routing paths, two full layouts of the antenna arrays with four split-ring resonators are addressed. As a demonstrator, a 2×2 antenna array prototype in a compact format is designed, fabricated, and tested. The fabricated antenna array achieves a measured directivity of 15.0 dBi with a fractional bandwidth of 23.0% centered at 30.5 GHz.

中文翻译：

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用于 Ka 波段应用的基于衬底集成波导的宽带裂环天线阵列

本文介绍了用于 Ka 波段（26.5-40 GHz）应用的基于衬底集成波导 (SIW) 的宽带裂环天线阵列。天线阵列由一个 2.92 毫米同轴连接器（K 型连接器）供电，功率平均分配到每个开口环谐振器。详细介绍了所设计的共面波导 (CPW)、SIW、CPW 到 SIW 转换、同轴到 CPW 转换和两级 SIW 功率分配器。通过使用带有银环氧树脂填充过孔的薄 Rogers 6002 基板，可以在背靠背配置中设计、制造和测试过渡原型。宽带开口环谐振器被开发为单个元件，并介绍了四种可能的天线阵列布置。通过结合设计的组件和布线路径，解决了具有四个开环谐振器的天线阵列的两种完整布局。作为演示器，设计、制造和测试了一个紧凑格式的 2×2 天线阵列原型。制造的天线阵列实现了 15.0 dBi 的测量方向性，以 30.5 GHz 为中心的部分带宽为 23.0%。