A metal plate array (MPA) which is a structure complimentary to a metal hole array (MHA), supports spoof surface plasmon polaritons (SSPP) as well as an MHA does. Babinet’s principle attributes the phenomenon of duality to transmission characteristics of the complimentary impedance surfaces because of the symmetry of the behaviors of electric and magnetic fields. However, it is also a fact that the complimentary structures do not follow this principle if they have wavelength-size thickness, because electromagnetic waves do not treat such thick structures as a boundary surface but as propagation spaces with the specific boundaries such as a waveguide which shows SSPP modes. If the thickness is so small that it is negligible, Babinet’s principle is still valid, while it has been uncertain how the layer thickness works to break the principle as it is increased. The unconfirmed transformation is revealed analytically and experimentally with the use of MPAs and MHAs of varying thicknesses.

金属板阵列（MPA）是与金属孔阵列（MHA）互补的结构，与MHA一样，也支持欺骗表面等离振子极化子（SSPP）。Babinet原理将对偶现象归因于互补阻抗表面的传输特性，因为电场和磁场的行为是对称的。但是，如果互补结构具有波长大小的厚度，这也是一个事实，因为电磁波不会将厚结构视为边界表面，而是将其视为具有特定边界的传播空间，例如波导，显示SSPP模式。如果厚度太小而可以忽略不计，则巴比涅原理仍然有效，虽然尚不确定层厚度如何随着厚度增​​加而破坏原理。使用不同厚度的MPA和MHA在分析和实验上揭示了未经证实的转化。