Electromagnetic Property of Coupled System of One-Dimensional Photonic Crystal

摘要

We propose and validate a novel coupled system of photonic crystals with four ports. The electromagnetically coupled waveguide system of microstrip lines with four ports is configured with a pair of closely aligned one-dimensional photonic crystals. The transmission characteristics between two ports are calculated by the method of moments and are observed by using a vector network analyzer. The special transmission characteristics of the coupled transmission line and the photonic crystal are observed. Outside the photonic band gap region, the transmission characteristics from the incident port on a transmission line to the exit port on the other line show reflection characteristics that are unique to the photonic crystal. This is because only the odd modes are coupled between two closely aligned transmission lines. Inside the photonic band gap region, the transmission spectra become opaque because of the absence of electromagnetic modes.