Wave Propagation in Rectangular Waveguides with Symmetrically Placed Tapered Ridges

This paper is concerned with the determination of the cutoff wavelength and field components of the dominant TE mode propagating in rectangular waveguides with single- and double-tapered ridges placed symmetrically about the guide axis. The tapering is in the direction of wave propagation. Evaluations of cutoff wavelength and of values of field components along the central axis are carried out. Different configurations of tapered-ridges are investigated. Curves of cutoff wavelength and field components of the dominant TE mode are plotted as a function of position along the axis, with the tapering angle as a variable parameter. The field components are determined for a generated frequency of 2.45 GHz. The illustrated data are quite useful in designing ridge waveguide applicators of microwave heating and drying systems.