Dispersion properties of rectangularly-corrugated waveguide structures by the in-house 3D FDTD code COCHLEA in cylindrical coordinates - Peponis, Dimitrios V.; Latsas, George P.; Ioannidis, Zisis C.; Tigelis, Ioannis G. (IET Microwaves, Antennas {&}amp$\mathsemicolon$ Propagation, 2018)