Study of beam splitting using aperiodic metallic photonic bandgap materials

This paper presents some results about aperiodic metallic photonic bandgap structure behaviors which can be useful for communication systems inside buildings. The reflection and transmission response of these structures composed of metallic wires depends on the direction of the excitation. The study of the Floquet modes, which depends on the ratio between the period and the wavelength, allows the authors to design a structure able to split an incident plane into two beams propagating in different directions. These structures are composed of a first layer with a large period, and other layers excited at a frequency corresponding to a bandgap for the normal direction and to a propagation band in other directions.