A metamaterial, characterised by comprising: a plurality of metamaterial layers , each of the plurality of metamaterial layers comprising: a substrate and a plurality of artificial microstructures attached to the substrate, wherein the metamaterial layers are stacked together along a direction perpendicular to the plane of their substrates, wherein adjacent substrates are fixed together by providing an initially liquid substrate material as a filling between the metamaterial layers, and wherein each of the plurality of artificial microstructures comprises: a first metal wire (a1); a second metal wire (a2) parallel to the first metal wire (a1); at least one first metal wire branch (bl); and at least one second metal wire branch (b2), wherein, the at least one first metal wire branch (b1) and the at least one second metal wire branch (b2) are distributed in an interlacement arrangement, the at least one first metal branch (b1) and the at least one second metal branch (b2) are parallel to each other, one end of the at least one first metal wire branch (b1) is connected to the first metal wire (a1), the other end is defined as a free end facing towards the second metal wire (a2); one end of the at least one second metal wire branch (b2) is connected to the second metal wire (a2), and the other end of the at least one second metal wire branch (b2) as a free end faces towards the first metal wire (a1). a substrate and a plurality of artificial microstructures attached to the substrate, wherein the metamaterial layers are stacked together along a direction perpendicular to the plane of their substrates, wherein adjacent substrates are fixed together by providing an initially liquid substrate material as a filling between the metamaterial layers, and wherein each of the plurality of artificial microstructures comprises: a first metal wire (a1); a second metal wire (a2) parallel to the first metal wire (a1); at least one first metal wire branch (bl); and at least one second metal wire branch (b2), wherein, the at least one first metal wire branch (b1) and the at least one second metal wire branch (b2) are distributed in an interlacement arrangement, the at least one first metal branch (b1) and the at least one second metal branch (b2) are parallel to each other, one end of the at least one first metal wire branch (b1) is connected to the first metal wire (a1), the other end is defined as a free end facing towards the second metal wire (a2); one end of the at least one second metal wire branch (b2) is connected to the second metal wire (a2), and the other end of the at least one second metal wire branch (b2) as a free end faces towards the first metal wire (a1). a first metal wire (a1); a second metal wire (a2) parallel to the first metal wire (a1); at least one first metal wire branch (bl); and at least one second metal wire branch (b2), wherein, the at least one first metal wire branch (b1) and the at least one second metal wire branch (b2) are distributed in an interlacement arrangement, the at least one first metal branch (b1) and the at least one second metal branch (b2) are parallel to each other, one end of the at least one first metal wire branch (b1) is connected to the first metal wire (a1), the other end is defined as a free end facing towards the second metal wire (a2); one end of the at least one second metal wire branch (b2) is connected to the second metal wire (a2), and the other end of the at least one second metal wire branch (b2) as a free end faces towards the first metal wire (a1). <EOS>