An antenna array (200, 300) comprising: a micro-strip set (250, 350), comprising a plurality of first micro-strips (2401-2402, 340_1-340_m) and a primary micro-strip (240, 340), wherein the plurality of first micro-strips (2401, 2402, 340_1-340_m) are coupled to the primary micro-strip (240, 340); a plurality of radiator sets (220, 230, 320_1-320_m), each of the plurality of radiator sets (220, 230, 320_1-320_m) comprising a plurality of radiators (220_1-220_N, 230_1-230_N) connected in series through second micro-strips, wherein the plurality of radiator sets (220, 230, 320_1-320_m) are coupled to the plurality of first micro-strips (2401, 2402, 340_1-340_m) in a one-by-one correspondence; and a base plate (210, 310), wherein the micro-strip set (250, 350) and the plurality of radiator sets (220, 230, 320_1-320 m) are disposed on a first surface of the base plate (210, 310); a first metal layer (2601, 360_1), disposed on a second surface of the base plate (210, 310), wherein the second surface is disposed on an opposite side to the first surface, and the first metal layer (2601, 360_1) covers an area on the second surface in correspondence to the respective micro-strip set (250, 350) and does not overlap with areas mapped by the plurality of radiator sets (220, 230, 320_1-320_m) on the second surface; and a plurality of second metal layers (2602-2605, 360_2-360_4), disposed on the second surface as distinct linear stripes disposed in parallel, the plurality of second metal layers (2602-2605, 360_2-360_4) respectively covering areas mapped by mutual-corresponding second micro-strips used for connecting the plurality of radiators (220, 230, 320_1-320_m) and the plurality of second metal layers (2602-2605, 360_2-360_4.) does not overlap with the areas mapped by the plurality of radiators (220_1-220_N, 230_1 -230-N) on the second surface; wherein the plurality of radiator sets (220, 230, 320_1-320M) is aligned in parallel along both lateral sides of the base plate (210, 310) and in each of the plurality of radiator sets (220, 230, 320_1-320-m), a length of each of the plurality of radiators (220_1-220_N, 230_1-230_N) equals to a half wavelength or a multiple of the half wavelength of a signal transmitted by the respective micro-strip set (50, 350). a micro-strip set (250, 350), comprising a plurality of first micro-strips (2401-2402, 340_1-340_m) and a primary micro-strip (240, 340), wherein the plurality of first micro-strips (2401, 2402, 340_1-340_m) are coupled to the primary micro-strip (240, 340); a plurality of radiator sets (220, 230, 320_1-320_m), each of the plurality of radiator sets (220, 230, 320_1-320_m) comprising a plurality of radiators (220_1-220_N, 230_1-230_N) connected in series through second micro-strips, wherein the plurality of radiator sets (220, 230, 320_1-320_m) are coupled to the plurality of first micro-strips (2401, 2402, 340_1-340_m) in a one-by-one correspondence; and a base plate (210, 310), wherein the micro-strip set (250, 350) and the plurality of radiator sets (220, 230, 320_1-320 m) are disposed on a first surface of the base plate (210, 310); a first metal layer (2601, 360_1), disposed on a second surface of the base plate (210, 310), wherein the second surface is disposed on an opposite side to the first surface, and the first metal layer (2601, 360_1) covers an area on the second surface in correspondence to the respective micro-strip set (250, 350) and does not overlap with areas mapped by the plurality of radiator sets (220, 230, 320_1-320_m) on the second surface; and a plurality of second metal layers (2602-2605, 360_2-360_4), disposed on the second surface as distinct linear stripes disposed in parallel, the plurality of second metal layers (2602-2605, 360_2-360_4) respectively covering areas mapped by mutual-corresponding second micro-strips used for connecting the plurality of radiators (220, 230, 320_1-320_m) and the plurality of second metal layers (2602-2605, 360_2-360_4.) does not overlap with the areas mapped by the plurality of radiators (220_1-220_N, 230_1 -230-N) on the second surface; wherein the plurality of radiator sets (220, 230, 320_1-320M) is aligned in parallel along both lateral sides of the base plate (210, 310) and in each of the plurality of radiator sets (220, 230, 320_1-320-m), a length of each of the plurality of radiators (220_1-220_N, 230_1-230_N) equals to a half wavelength or a multiple of the half wavelength of a signal transmitted by the respective micro-strip set (50, 350).