New class of artificial geometrically chiral three-dimensional structures

A new class of artificial geometrically chiral three-dimensional structures is presented. An artificial medium exhibiting chiral properties in the microwave range is realized on the basis of artificial conducting one-dimensional, two-dimensional, and three dimensional molecules of the mirror-asymmetric shape, which usually are oriented chaotically and are positioned periodically at distances commensurable with the radiation wavelength. The geometric solution to the chirality problem was proposed, which implies a structure chiral in its form rather than in its content. The structures contain a large number of layers, each of them representing an ordered chiral composition that contains microscopic plates of two different materials. It is possible to create arrays with a narrowed width of the main lobe for the axial emission in the case of the simultaneous application of several geometrically chiral structures.