NDLI: "Comb-Quad" millimeter-wave coupled-cavity TWT interaction structure

Content Provider	IEEE Xplore Digital Library
Author	Karp, A.
Copyright Year	1981
Description	Author affiliation: Varian Associates, Inc., Palo Alto, CA (Karp, A.)
Abstract	The "Comb-Quad" interaction structure has been under study for millimeter-wave space-harmonic TWTs as an electrically comparable, but mechanically very different, substitute for coupled-cavity stacks with "staggered" coupling apertures. Based on four one-piece copper combs, Comb-Quad construction relies on very few piece parts, establishes the periodicity prior to assembly, and leads to a low-loss and mechanically and thermally robust circuit. "Ferrules" are absent, but the interaction-gap capacitance typically is significantly less than that of a ferrule-less conventional cavity stack with the same period, gap length and frequency band. The dispersion has been found readily controllable such that generous "hot" bandwidths may be obtained even at the low beam perveances associated with millimeter-wave TWTs. Topological and electrical equivalents and the determinants of "cold" and "hot" bandwidth have been identified, and the parameters of dispersion, gap capacitance, impedance, and attenuation examined. Secondary passbands and possible extraneous modes were characterized and the impact of dimensional variations and defects charted. Broadband waveguide couplers were easily implemented. Data from an X-band exploratory test vehicle operated at variable low perveance validated the means assembled for predicting small-signal gain and bandwidth and matters of stability.
Starting Page	325
Ending Page	327
File Size	244172
Page Count	3
File Format	PDF
DOI	10.1109/IEDM.1981.190078
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1981-12-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bandwidth Coupling circuits Assembly Capacitance Millimeter wave circuits Apertures Copper Robustness Frequency Structural beams
Content Type	Text
Resource Type	Article

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