Towards Low-Frequency Reconfigurable Computational Magnetic Metasurfaces

This paper presents a preliminary investigation to show the ability of reconfigurable magnetic metasurfaces to perform analog mathematical operations in the radio frequency (RF) regime. In particular, the operations are implemented over the circulating currents of the active unit-cells selected as inputs. Then, through the other passive metasurface elements, the result of the operation can be read as the circulating current of the output unit-cell. From a practical point of view, the structure is synthetized by exploiting an analytical formulation based on circuital equations. In this way, the loading conditions that must be applied to each unit-cell of the system to implement the desired operation can be retrieved. A numerical test case was conceived to prove the method effectiveness. The model consists in 5 loops capable of performing a linear combination between two input currents whose weighting coefficients can be arbitrarily set.