In-band resonant loss in twt's

Details In-band resonant loss in twt's In-band resonant loss in twt's

H - Electricity

01

J

353/11

H01J 25/34 (2006.01) H01J 23/00 (2006.01) H01J 23/30 (2006.01)

Patent

CA 1167568

- 9 - In-Band Resonant Loss in TWT's Abstract In traveling wave tubes with broad bandwidth, such as an octave or more, the gain varies by many dB across the band. One or more lossy circuits in- side the tube coupled to the interaction helix-type slow-wave circuit are resonant at frequencies within the operating band. They provide a loss varying with frequency to compensate for the gain variation. The resonant circuits are typically metallized pat- terns on a dielectric rod which may be a support rod for the interaction circuit. Compared to an external gain equalizer in the drive circuit of the TWT, the internal equalizer is cheaper and provides a better noise figure.

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