Crescent ring resonator

A metamaterial resonator structure having a size for resonating a predetermined frequency band, said structure comprising:

• at least one dielectric slab having a plurality of surfaces;
• and
• at least one conductive resonator element configured on one of the surfaces of the at least one dielectric slab, said conductive element having a crescent shape including a center portion and opposing end portions defining a gap therebetween, wherein the center portion has a wider dimension than the end portions so that a width of the element gradually tapers from the center portion to the end portions, said conductive element having a diameter that is a fraction of a wavelength of a center frequency of the frequency band, and wherein the at least one conductive element is configured on the at least one surface of the slab so that an outer edge of the conductive element aligns with an outer edge of the slab.

A metamaterial resonator structure having a size for resonating a predetermined frequency band, said structure comprising:

• a plurality of dielectric slabs each having a top surface and a bottom surface defining a thickness there between and each defining a unit cell of the structure;
• and
• a plurality of conductive resonator elements where each conductive element is configured on the top surface of the corresponding dielectric slabs, each conductive element having a crescent shape including a center portion and opposing end portions defining a gap there between, wherein the center portion has a wider dimension than the end portions so that a width of the element gradually tapers from the center portion to the end portions, and wherein each unit cell resonates at a different portion of the predetermined frequency band.