使用新型小型化软表面进行天线间去耦

Mutual coupling reduction for microstrip antennas using novel miniaturized soft surface

摘要:

设计了一种小型化条带型软表面结构，该结构在经典条带型软表面基础上增加了开口环设计。通过波导传输法，对软表面抑制表面波的能力进行仿真，通过对加载开口环前后的S参数及表面电流的分析，证明了设计的软表面对表面波的抑制能力更强。此外，仿真表明设计的软表面可在更低频段产生电磁传输抑制效应，实现结构小型化。将提出的软表面加载于微带天线之间，可用于抑制微带天线间耦合。新型小型化软表面在结构上高度对称，且剖面高度较低，可使两微带天线间的耦合在工作带宽内减小7 dB以上，有效抑制了微带天线间表面波的传播，实现了天线间去耦效果。

Abstract:

This paper presents a compact strip-type soft surface structure, designed by introducing an aperture ring onto the foundation of the classical strip-type soft surface. Through guided wave transmission simulations, the capability of the soft surface to suppress surface waves is assessed. By analyzing the S-parameters and surface currents before and after incorporating the aperture ring, it is demonstrated that the designed soft surface in this study exhibits superior suppression capability against surface waves. Furthermore, simulations indicate the potential for electromagnetic transmission suppression at lower frequency bands, achieving structural miniaturization. When applied between microstrip antennas, the proposed soft surface can effectively suppress coupling between them. The novel miniaturized soft surface, featuring an added aperture ring on the basis of the classical strip-type soft surface, is highly symmetrical in structure with a low profile. This structure reduces the coupling between two microstrip antennas by more than 7 dB within the operating bandwidth, effectively suppressing the propagation of surface waves between the microstrip antennas and achieving decoupling effects.