One-dimensional metamaterials were realized by using composite right/left-handed transmission lines(CRLH TLs),the transmission properties of the photonic crystals composed of metamaterials based on microstrips lines were measured and analyzed.The experimental results indicate that the photonic crystals possess Bragg gaps and effective-single-negative(ESNG) gap,and the ESNG gap does not shift when the lattice constant varies by the same factor,and the edges of the gap are determined by zero average permittiv...