In this letter, a novel circularly polarized (CP) slotted substrate integrated waveguide (SIW) cavity antenna using a hybrid TE202 mode (HTM) and the eigen TE202 mode (ETM) is proposed and studied. The antenna is designed for Ku-band satellite wireless link applications. It utilizes two different and orthogonal TE202 modes (ETM and HTM) with slots etched on the surface to form left-hand CP radiation. It is directly fed by a coaxial probe with a low profile. The working mechanism and the design approach are elaborated. The current distribution for the two TE202 high-order modes is analyzed. Shorting pins and slots are applied to generate the required CP radiation. To verify the feasibility, the antenna is simulated and fabricated using the conventional printed circuit board (PCB) process. It has a measured –10 dB impedance bandwidth of 4.2% and a 3 dB axial ratio (AR) bandwidth of 1.6%. The peak gain is over 7 dBic in the operation band. The antenna has a size of 0.92λ0 × 0.90λ0, where λ0 is the free-space wavelength at 12.24 GHz. Good agreement between the simulation and measurement results is observed.

中文翻译：

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一种基于高阶双模腔的圆极化SIW缝隙天线

在这封信中，提出并研究了一种使用混合 TE202 模式 (HTM) 和本征 TE202 模式 (ETM) 的新型圆极化 (CP) 开槽衬底集成波导 (SIW) 腔天线。该天线专为 Ku 波段卫星无线链路应用而设计。它利用两种不同且正交的 TE202 模式（ETM 和 HTM），在表面蚀刻槽以形成左手 CP 辐射。它由一个低剖面的同轴探头直接馈电。阐述了工作机制和设计方法。分析了两个 TE202 高阶模式的电流分布。使用短路销和槽来产生所需的 CP 辐射。为了验证可行性，使用传统的印刷电路板 (PCB) 工艺模拟和制造天线。它的测得 –10 dB 阻抗带宽为 4。2% 和 1.6% 的 3 dB 轴比 (AR) 带宽。工作频段的峰值增益超过 7 dBic。天线的尺寸为 0.92λ0 × 0.90λ0，其中 λ0 是 12.24 GHz 的自由空间波长。观察到模拟和测量结果之间的良好一致性。