A New Homogenization-Free Boundary Condition Towards Aperiodic Metasurface Design Using Full-Wave Surrogate Models of Printed Circuits
arxiv(2024)
摘要
A new homogenization-free boundary condition is introduced for the design of
metasurfaces. The boundary condition, linking the tangential electric field to
the induced surface current density within a unit cell, is described as a
matrix equation containing a surrogate model of a printed circuit. Full-wave
simulations are performed to construct the data needed to capture the physics
of a printed circuits response to exciting fields in terms of its induced
current density. The matrix equation takes the form of a boundary condition
which can be included in design and optimization algorithms incorporating
mutual coupling in the form of an impedance matrix. Modelling the metasurface
in this manner allows for direct design of the realizable model avoiding any
homogenization or locally periodic approximations leading to a paradigm shift
in metasurface design approaches. The surrogate models construction is
described and its use in a 50 printed circuit example is provided.
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