  DB boundary conditions have been simulated in terms of perfect electric
conductor (PEC) boundary for transverse electric modes and perfect magnetic
conductor (PMC) for transverse magnetic modes. Electric and magnetic fields
inside the dielectric region of a parallel plate DB boundary waveguide have
been derived and fractional curl operator has been utilized to study the
fractional parallel plate DB waveguide. Field behavior as well as transverse
impedance of the guide walls have been studied with respect to the fractional
parameter describing the order of fractional curl operator. The results are
also compared with the corresponding results for fractional waveguides with PEC
walls.
