A novel wideband substrate integrated waveguide (SIW) cavity-backed antenna element and its array are proposed in this letter. The proposed linearly polarized array element consists of a SIW cavity, stacked patches, and a coaxial probe. The SIW cavity-backed array element is implemented with physically connected stacked patch. The coaxial pin is directly connected to the two patch radiators. Blind and buried vias were avoided, this work significantly reduces the manufacture cost and complexity. The array features light weight and simple feed structure. The proposed element exhibits an impedance-matching bandwidth of 18.2% (14.5–17.4 GHz) for | S ₁₁ |<−10 dB. Simulation results illustrate that the infinite array can scan up to ±80° in the H -plane with 8% bandwidth (14.4–15.6 GHz), under the criterion of active voltage standing- wave ratio (VSWR) ≤ 3. For verification purposes, a 4 × 16 active phased array antenna prototype is fabricated using the conventional microwave multilayer printed circuit board (PCB) process. The measured results agree very well with simulations.

中文翻译：

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广角扫描相控阵物理连接宽带SIW腔背衬贴片天线的设计

本文提出了一种新型的宽带基片集成波导（SIW）腔背天线元件及其阵列。提出的线性极化阵列元件由SIW腔，堆叠的贴片和同轴探针组成。SIW腔体支持的阵列元件通过物理连接的堆叠式贴片实现。同轴引脚直接连接到两个贴片散热器。避免了盲孔和掩埋过孔，这项工作大大降低了制造成本和复杂性。该阵列具有重量轻和简单的进料结构的特点。对于| |，建议的元件展现出18.2％（14.5-17.4 GHz）的阻抗匹配带宽。 小号 ₁₁ | <−10 dB。仿真结果表明，无限阵列可以在±80°的范围内扫描。H 在有源电压驻波比（VSWR）≤3的标准下，具有8％带宽（14.4-15.6 GHz）的平面。为验证起见，使用传统的微波多层印刷技术制造了4×16有源相控阵天线原型电路板（PCB）工艺。测量结果与模拟非常吻合。