In this letter, the compact multilayer differential corrugated substrate integrated waveguide (CSIW) and half-mode CSIW (HMCSIW) are designed by two vertically stacked identical CSIW and HMCSIW, respectively, and an aperture is etched on the common ground between them. Both the CSIW and HMCSIW have only one nonzero vertical electric field component in host waveguide. Under the common-mode (CM) operation, the aperture is a perfect magnetic conductor (PMC). When the height of the single substrate is less than $\lambda _{g}$ /4, the space between the perfect electric conductor (PEC) and PMC cannot transmit electromagnetic waves, and the edge of the aperture is an open circuit. Therefore, the etched aperture in differential CSIW can effectively cutoff CM noise. For the HMCSIW, the spoof surface plasmon polariton (SPP) is loaded in the aperture near the open circuit plane to suppress the slot line mode. Under the differential-mode (DM) operation, the aperture has less effect on the DM frequency responses. For verification, the differential HMCSIW is fabricated, and good agreement between the measured and simulated results demonstrates the validity of proposed configurations.

中文翻译：

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具有高共模抑制的紧凑型多层差分CSIW和HMCSIW设计

在这封信中，紧凑的多层差分波纹衬底集成波导（CSIW）和半模CSIW（HMCSIW）分别由两个垂直堆叠的相同CSIW和HMCSIW设计，并在它们之间的公共基础上蚀刻了一个孔径。CSIW 和 HMCSIW 在主波导中都只有一个非零垂直电场分量。在共模 (CM) 操作下，孔径是完美的磁导体 (PMC)。当单个基板的高度小于$\lambda_{g}$/4时，理想电导体（PEC）和PMC之间的空间不能传输电磁波，孔径边缘为开路。因此，差分 CSIW 中的蚀刻孔径可以有效地切断 CM 噪声。对于 HMCSIW，欺骗表面等离子体激元 (SPP) 加载在开路平面附近的孔径中，以抑制槽线模式。在差模 (DM) 操作下，孔径对 DM 频率响应的影响较小。为了验证，制作了差分 HMCSIW，测量结果和模拟结果之间的良好一致性证明了所提出配置的有效性。