Helical slow-wave structure assemblies and fabrication methods

Details Helical slow-wave structure assemblies and fabrication methods Helical slow-wave structure assemblies and fabrication methods

1979-03-16

1980-10-21

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

29600, 29 2514, 333163, 315 36, 315 393, H01J 2534

Patent

active

042296765

ABSTRACT:
Helical slow-wave structure assemblies including a helical dielectric supporting member are disclosed along with methods for fabricating such assemblies. After the slow-wave structure helix is wound on a mandrel, a masking helix is coaxially wound about the slow-wave structure helix in the same sense as the slow-wave structure helix over the helical space between turns of the slow-wave structure helix and in overlapping relationship with portions of adjacent turns of the slow-wave structure helix. The supporting helix is formed by plasma spraying dielectric material into the helical space between turns of the masking helix. The dielectric material is ground to a predetermined radial dimension, and the mandrel and the masking helix are removed. By utilizing a masking helix of tapered width, a dielectric supporting helix of tapered width may be fabricated to provide a slow-wave structure assembly with a tapered phase velocity. A slow-wave structure helix having a radially outwardly extending longitudinal ridge may be utilized to provide a structure of wide bandwidth.

REFERENCES:
patent: 2850666 (1958-09-01), Brewer
patent: 2889487 (1959-06-01), Birdsall et al.
patent: 3519964 (1970-07-01), Chorney et al.
patent: 3610999 (1971-10-01), Falce
patent: 3670197 (1972-06-01), Unger
patent: 3925738 (1975-12-01), Bates et al.
patent: 4115721 (1978-09-01), Friz

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