A three-dimensional antenna structure suitable for being built in an electronic device includes a vertical patch, an annular patch and a ground patch. In order to determine the postscript commands, the EIC array may be represented as a bit for every point, as EIC symbols in which each kind of EIC symbol is a glyph of a font, or as graphics procedures. The method comprises the steps of: combining an alkali metal borohydride, an alkali metal hydroxide, an alkali metal bisulfite and phosphoric acid to form a reducing solution; and adding the reducing solution to a pulp slurry in an amount from 0.