Abstract
The space harmonic analysis of the dielectrically loaded comb structure as used in traveling-wave masers (TWM) is presented. The frequency-phase characteristics (the ω-β diagrams) are computed by regarding each finger of the comb structure as a capacitive loaded transmission line. The impedance of the line is based on the space harmonic analysis. Computed data are found to be in agreement with experimental results and, in particular, it is confirmed that the ω-β relation depends very critically on certain dimensions of the dielectric loading. The results of the analysis are used to derive prescriptions for the design of dielectrically loaded TWM comb structures, especially of structures with low group velocity which are suitable to provide simultaneously large gain and large instantaneous bandwidth.
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