## Experimental Investigation of Transmission-line Representations of Microwave Periodic CircuitsResearch is presented on transmission line models of a type of periodically-loaded waveguide which is important to the design of high power traveling wave tubes and linear accelerators. A simple and well-known model, referred to as the single-line model, is descr bed in terms of a single transmission line periodically loaded ith shunt susceptances; the model has the limitation that direct coupling between neighboring irises is not accounted for when the simple one-port element is used to represent the network properties of a thin transverse iris. The model is then improved in such a way that this limitation is removed to a first order of approximation; the iris is assumed to behave as a shunt two-port network coupling smooth transmission lines having the properties of appropriate normal waveguide modes. This latter formulation of the two-port representation of a waveguide iris is new. It is found experimentally that the new model of the structure, referred to as the two-line model, covers a class of circuits used in practical applications. (Author). |

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agreement annular ring iris apply asymptotes calculated Chapter computed Brillouin diagrams consider cosh coth coupled crystal detector cutoff frequency cutoff modes data points determining discussed dispersion curves dispersion relation dominant mode electrical length equivalent circuit evaluate frequency range higher order modes Hole diameter iris plane iris susceptance parameters irises loading susceptance Measured Hyperbolae measured susceptance measuring cavity meters Microwave modal lines mode cutoff frequency model curve nonpropagating normal waveguide modes one-line model passband periodic circuit periodic spacing periodic structure periodically loaded perturbed single-line model plunger face plunger location plunger setting predict propagation constant radians reference curve reference plane represent representation resonance frequency resonant cavity rms error shorting plungers shown in Fig shunt susceptance single line model single-line model dispersion single-line model susceptance single-line susceptance sinh symmetry system error thin iris transfer matrix tuning curve two-line model two-port network values