Abstract
AbstractThe detail behavior of tapered waveguide circuits with finite wall surface resistance used at or close to the cutoff frequency is investigated. The analytical method used is based on a generalized waveguide transmission equation applied to the TE10 mode of a square waveguide with finite inner wall surface resistance. An equation suitable for numerical calculations is derived. Further, in the case of waveguides of finite wall surface resistance, the equivalent characteristic impedance and the propagation constant are also derived. The equations derived herein (imposed to a uniform waveguide) are in agreement with the frequently used approximate equations in the frequency range far from the cutoff. Two types of taper waveguide circuits are devised for uses around the cutoff frequency. The shapes of the measured frequency characteristics of the return losses of these circuits are in agreement with those of the theoretical ones. Further, it is confirmed that if the effective value of the conductivity of the wall surface is taken to be one‐half that of the nominal one, there is good agreement between the theoretical and experimental results.
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