An apparatus (912, 914) comprising: a dielectric substrate (1032, 1042) having a first area and a second area disposed around the first area; a first radiator 1030, 1040) disposed on a surface of the dielectric substrate (1032, 1042), in the first area, the first radiator (1030, 1040) being configured to transmit and receive radio signals at an operational frequency; a first plurality of metamaterial structures (1034, 1044) disposed in a periodic pattern on the surface of the dielectric substrate (1032, 1042) in the second area and within a near field of the first radiator (1030, 1040), wherein a maximum width of each of the first plurality of metamaterial structures (1034, 1044) is less than half of a wavelength of the operational frequency; and a second radiator and a second plurality of metamaterial structures disposed on a second plane within the dielectric substrate (1032, 1042), the second radiator being disposed in the first area of the dielectric substrate (1032, 1042) under the first radiator (1030, 1040), and the second plurality of metamaterial structures being disposed in the second area of the dielectric substrate (1032, 1042) under the first plurality of metamaterial structures (1034, 1044); wherein the first radiator (1030, 1040) and the first plurality of metamaterial structures (1034, 1044) are disposed on a first plane of the dielectric substrate (1032, 1042), wherein each of the first plurality of metamaterial structures (1034, 1044) are electrically coupled to a metamaterial structure of the second plurality of metamaterial structures in an adjacent layer with two conducting vias (1034a, 1046a) to form a conductive loop structure. a dielectric substrate (1032, 1042) having a first area and a second area disposed around the first area; a first radiator 1030, 1040) disposed on a surface of the dielectric substrate (1032, 1042), in the first area, the first radiator (1030, 1040) being configured to transmit and receive radio signals at an operational frequency; a first plurality of metamaterial structures (1034, 1044) disposed in a periodic pattern on the surface of the dielectric substrate (1032, 1042) in the second area and within a near field of the first radiator (1030, 1040), wherein a maximum width of each of the first plurality of metamaterial structures (1034, 1044) is less than half of a wavelength of the operational frequency; and a second radiator and a second plurality of metamaterial structures disposed on a second plane within the dielectric substrate (1032, 1042), the second radiator being disposed in the first area of the dielectric substrate (1032, 1042) under the first radiator (1030, 1040), and the second plurality of metamaterial structures being disposed in the second area of the dielectric substrate (1032, 1042) under the first plurality of metamaterial structures (1034, 1044); wherein the first radiator (1030, 1040) and the first plurality of metamaterial structures (1034, 1044) are disposed on a first plane of the dielectric substrate (1032, 1042), wherein each of the first plurality of metamaterial structures (1034, 1044) are electrically coupled to a metamaterial structure of the second plurality of metamaterial structures in an adjacent layer with two conducting vias (1034a, 1046a) to form a conductive loop structure.