The most important practical challenge is to produce a thin panel
having hundreds of millimeter perforations per square centimeter.
With the development of finer machinery and advanced manufacturing
technologies to form micrometer order holes, such as laser
drilling, powder metallurgy, welded meshing and electro-etching,
practical fabrication of MPP absorbers is becoming a reality.
Another option suggested for manufacturing an MPP is the use of
a fine wire mesh or even fabrics.53 Further developments on both
theoretical aspects and practical applications of MPP are currently
being investigated, including their nonlinear behavior.54,55