Design of microwave circuit with periodic structure for channel switching by carrier frequency

Abstract

Design of a microwave circuit in photonic crystal structure is proposed for channel switching which depends on the carrier frequency, based on an experimental study. Waveguide structure with a line defect is situated in periodic array of ceramic rods. Another waveguide for switched output is coupled through a cavity with the input/output waveguide. Due to resonance in the cavity, the specific frequency component is coupled and guided into the waveguide after resonant coupling. Fairly high resonance and clear separation is obtained in the experiment. The result is applicable for signal switching in frequency division multiplexing system.