Features of Microwave Propagation Through a Two-Layer Metasurface Made of Conductive Rods

In a two-layer meta surface consisting of periodically arranged rods, there is a strong dispersion of the transmission coefficient in the microwave region of the spectrum. The observed phenomenon is the result of the resonant interaction of the microwave with the rod, where a standing wave with axial symmetry is formed, as well as the effective electrical interaction between the rods of adjacent layers. The transmission coefficient curve found in the experiment has an acute peak, which allows the structure to be used as a bandpass filter. It was found that the resonant frequency shifts to the low-frequency region as the length of the rods, their diameter, and the distance between the layers increases, which opens up the possibilities of controlling the microwave.