In this work, directly perforated substrate integrated waveguides (SIWs) in the form of periodic air holes are studied with a focus on the electromagnetic shielding effect by examining its bandpass and stopband filtering characteristics. Two different configurations of the air-filled holes are considered for this electromagnetic bandgap structure, which are called shielded and unshielded cases. In both the scenarios, the relationship between the center frequency of the bandgap and the structural material and geometric parameters is established and used for the bandgap investigation. In addition, the impact that the shielding of the air-filled holes yields on the loss of the structure is systematically examined. Finally, equivalent circuits for both the cases are formulated and experimentally verified up to 30 GHz.

中文翻译：

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基板集成波导中周期性穿孔非屏蔽气孔的影响

在这项工作中，通过检查其带通和阻带滤波特性，研究了周期性气孔形式的直接穿孔基板集成波导（SIW），重点是电磁屏蔽效应。这种电磁带隙结构考虑了两种不同的充气孔配置，称为屏蔽壳和非屏蔽壳。在这两种情况下，都建立了带隙中心频率与结构材料和几何参数之间的关系，并将其用于带隙调查。此外，系统地检查了充气孔的屏蔽对结构损失的影响。最后，针对这两种情况制定了等效电路，并在高达 30 GHz 的频率下进行了实验验证。