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A folded waveguide composed of dielectric photonic crystal material is designed and its in-plan propagation characteristics are studied by calculating the dispersion diagram using finite difference frequency domain algorithm and analyzing the electromagnetic wave guiding by finite difference time domain algorithm. It is shown that a high order single-mode with moderate bandwidth can travel through...
A metal cylindrical waveguide coated with an inside layer of lossy dielectric which affects the propagation characteristics of a guided electromagnetic mode is investigated for gyrotron-traveling-wave tube (gyro-TWT) amplifier applications. This paper reveals a series of novel phenomena. The dispersion curve of a higher order mode has a turning point during its evolvement from the fast wave region...
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