Miniaturised EBG structures based on complementary geometries

In this paper complementary electromagnetic band gap structures (CMEBG) are studied. The proposed structures consist of a layer of periodic aperture array and a layer of periodic conducting array etched on either side of a thin dielectric substrate. Due to the high interaction between the elements in the two layers, very strong fields are produced in the separation region resulting in the formation of electrically large elements from physically small ones. The apertures are rotated 90deg with respect to the conductors, in order to achieve maximum element coupling. A thorough study on the effect of array periodicity, the element dimensions and the total number of elements on the final EBG response is presented here based on simulations and measurements