With this type of a stratified structure in mind, we can then use a plane wave expansion for the fields in and around the FSS, since plane waves are the eigenfunction solution to the vector wave equations in " source-free media ".
2.
These waves are solutions for a vector wave equations, such as the ones describing electromagnetic radiation or waves in an elastic solid, the solution for a homogeneous medium is similar : the " scalar " amplitude " A o " is replaced by a constant " vector " "'A o " '.
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