A balanced substrate-integrated waveguide (SIW) filter based on a virtual electric wall (VEW) is presented and studied in this Letter. By introducing VEW on the symmetry plane for replacing the metallic-via-array, conductor losses from metal sidewalls can be avoided. As proof-of-concept example, a six-pole balanced filter using asymmetric inductive windows is designed and fabricated with a measured centre frequency of 29.45 GHz, as well as fractional bandwidth of 7.2% to cover satellite ground terminal application. The measured response shows a good concordance with the simulated one, indicating that the proposed balanced filter has the advantages of high common-mode suppression and low insertion loss.

中文翻译：

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具有高共模抑制的毫米波平衡 SIW 带通滤波器

本文介绍并研究了一种基于虚拟电墙 (VEW) 的平衡基板集成波导 (SIW) 滤波器。通过在对称平面上引入 VEW 来代替金属通孔阵列，可以避免金属侧壁的导体损耗。作为概念验证示例，设计并制造了使用非对称电感窗口的六极平衡滤波器，其测量中心频率为 29.45 GHz，部分带宽为 7.2%，以覆盖卫星地面终端应用。实测响应与仿真结果一致，表明所提出的平衡滤波器具有高共模抑制和低插入损耗的优点。