Design and optimization of new sub-THz compact switch based on 2D photonic crystal with quadrupole resonance in ferrite resonator

This paper presents the design and optimization of a new switch, based on a two-dimensional photonic crystal with rectangle lattice consisting of a resonant cavity and two waveguides for use in sub-terahertz band. The resonant cavity is based on a ferrite cylinder biased by an external DC magnetic field with a quadrupole mode in the resonator. In order to enlarge the bandwidth of the switch, we applied an optimization procedure by using BOBYQA algorithm for search and optimization of geometrical parameters for the resonant cavity and dielectric rods, as well as the magnetic field intensity.