Experimental study of photonic crystal square lattice

Two dimension photonic crystal behaving in the region of micro wave composed of Fused silica cylinders(e=3.72) embedded in a styrofoma templat(e=1.04) being a high contrast system, it is a necessary. Condition for two dimension photonic crystal having photonic hand gap ((3.72-1.04)/(3.72+1.04)0.5) and set up a measurable system with syntheside sweeper and network analyzer etc. The transimission specturm of the photonic crystal were measured. There is a photonic band gap between 11.8 GHz and 13.5 GHz. We have a photonic band gap between 11.75 GHz and 13.4 GHz calculated by 421 plane waves, so the both agree well with each other.