Transmission Characteristics in Two Dimensional Periodic Waveguide Structures with 45 Degree Bend

Characteristics in two dimensional square lattice periodic structures composed of dielectric and metallic pillars were measured to investigate the fundamental transmission and reflection. For the purpose to improve the transmitted amount of electromagnetic field in 45 degree bend, the structure with additional pillars were examined for both materials. The effect of additional pillars was not observed, while reflection increased. Additional pillars did not contribute to the confinement, rather increased reflection due to impedance mismatching at bending point.