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To provide for an ever-increasing need for camouflage, experts in stealth have been envisioning for a few years to use metasurfaces and their unconventional electromagnetic properties [S. B. Glybovski et al., "Metasurfaces: From microwaves to visible," 2016] to serve as efficient cloaking devices. To prepare for the use of surface-mounted electronic components, useful for frequency-selecting purposes, we took interest in an equivalent circuit analysis of metasurfaces. Indeed, the works of [R. Dubrovka and R. Donnan, "Equivalent circuit of FSS loaded with lumped elements using modal decomposition equivalent circuit method," 2011] on metasurfaces using electronic components invite one to combine the passive behavior of the host structure with that of the lumped elements. The equivalent circuit analysis of the hosting surface deprived of electronic components can be done using the works of [F. Mesa et al., "Unlocking complexity using the ECA: The equivalent circuit model as an efficient and physically insightful tool for microwave engineering," 2018] on passive metasurfaces. This project therefore aims at translating the results of [F. Mesa et al., "Unlocking complexity using the ECA: The equivalent circuit model as an efficient and physically insightful tool for microwave engineering," 2018] onto the coaxial geometry of interest here. The validity of such a method is then assessed by comparison with the simulation results obtained using a finite-element method.
