π-mode formation of hybrid metallic photonic-band-gap coaxial resonator

pi-mode formation of hybrid metallic photonic-band-gap (PBG) coaxial resonator for single mode selection is demonstrated by using a finite- difference-time-domain simulation. The TE₉₁₁-mode as a pi-mode in 18-vane hybrid metallic PBG coaxial resonator is filtered by the TE₀₁₁-mode in the defect area at the resonant frequency of 30.9 GHz.