PURPOSE: A multi-resonant, high-impedance surfaces containing loaded-loop frequency selective surfaces are provided to achieve high-impedance surfaces, more particularly, a multi-resonant, and high-impedance electromagnetic surface. CONSTITUTION: An AMC(800) includes an array(802) that is a coplanar array of resonant loops or artificial magnetic molecules(804) which are strongly capacitively coupled to each other, forming a capacitive frequency selective surface(FSS). The resonant loops(804) are uniformly spaced and at a height h above a solid conductive ground plane(806). An array of electrically short, conductive posts or vias(808) are attached to the ground plane(806) only and have a length h. Each loop(804) includes a lumped capacitive load(810). The one or more layers of artificial magnetic molecules(AMMs) or resonant loops of the artificial magnetic conductor(800) create a frequency dependent permeability in the z direction, normal to the surface of the AMC(800).
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