Mode analysis and design of PBG cavity for tunable gyrotron

Abstract

A Metal Photonic-band-gap (MPBG) cavity is designed and simulated to operate in TE15,3 mode for second harmonic tunable gyrotron. The ADI-FDTD algorithm is used to investigate a unit cell of triangular metal PBG structure. The dispersion and global band diagram have been plotted for unit cell of triangular PBG structure. The MPBG cavity is formed by creating a defect in the 2-D periodic triangular PBG structure. The mode analysis has been done to estimate the all possible mode those can confine in the defect of periodic MPBG structure. The MPBG cavity has been modeled and simulated to observe its propagation behavior using a commercial 3D electromagnetic code. The return loss of the cavity is observed as ~47.62dB through its transient analysis. Its quality factor is observed as ~13143 through its Eigenmode analysis for the desire TE15,3 mode at ~527.5GHz. © 2019 URSI. All rights reserved.