A split ring resonator, SRR, antenna comprising a first conductive layer (210, 310) having a gap (212, 262, 312) and a cavity (213, 263, 313), the SRR antenna further comprises: a substrate having an outer edge, at least two layers including an outer layer and another layer different therefrom, a first surface disposed on the outer layer and a second surface disposed on the another layer wherein the first conductive layer (210, 310) is disposed on the first surface; a first feeding portion (215, 265, 315) disposed inside the cavity (213, 263, 313); a second conductive layer disposed on the second surface, and including a second feeding portion (235, 285, 335) corresponding to the first feeding portion (215, 265, 315); a first vertical interconnect access disposed between the first feeding portion (215, 265, 315) and the second feeding portion (235, 285, 335); and a signal line disposed on the first surface and electrically connected to the first feeding portion (215, 265, 315), wherein the first conductive layer (210, 310) defines two sides of the gap (212, 262, 312) to be a first inner edge (2121, 2621, 3121) and a second inner edge (2122, 2622, 3122), the cavity (213, 263, 313) is connected to the outer edge of the substrate through the gap (212, 262, 312) having a width smaller than an extent of the cavity (213, 263, 313) in a direction parallel to the outer edge, and the first conductive layer (210, 310) further includes a first matching element (217, 261, 317) disposed on the first inner edge (2121, 2621, 3121) and adjacent to the first feeding portion (215, 265, 315), characterized in that the first matching element comprises an edge that is parallel to the outer edge of the substrate and adjacent to and directly facing an edge of the first feeding portion that is parallel to the outer edge of the substrate. a substrate having an outer edge, at least two layers including an outer layer and another layer different therefrom, a first surface disposed on the outer layer and a second surface disposed on the another layer wherein the first conductive layer (210, 310) is disposed on the first surface; a first feeding portion (215, 265, 315) disposed inside the cavity (213, 263, 313); a second conductive layer disposed on the second surface, and including a second feeding portion (235, 285, 335) corresponding to the first feeding portion (215, 265, 315); a first vertical interconnect access disposed between the first feeding portion (215, 265, 315) and the second feeding portion (235, 285, 335); and a signal line disposed on the first surface and electrically connected to the first feeding portion (215, 265, 315), wherein the first conductive layer (210, 310) defines two sides of the gap (212, 262, 312) to be a first inner edge (2121, 2621, 3121) and a second inner edge (2122, 2622, 3122), the cavity (213, 263, 313) is connected to the outer edge of the substrate through the gap (212, 262, 312) having a width smaller than an extent of the cavity (213, 263, 313) in a direction parallel to the outer edge, and the first conductive layer (210, 310) further includes a first matching element (217, 261, 317) disposed on the first inner edge (2121, 2621, 3121) and adjacent to the first feeding portion (215, 265, 315), characterized in that the first matching element comprises an edge that is parallel to the outer edge of the substrate and adjacent to and directly facing an edge of the first feeding portion that is parallel to the outer edge of the substrate.