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Process for Fabricating Tapered Coaxial Transmission Lines

IP.com Disclosure Number: IPCOM000092820D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Burke, RG: AUTHOR

Abstract

A tapered transmission line can be produced by withdrawing metal rod 10 of uniform diameter from anodizing bath 12. This is effected at a programmed rate so as to cause the anodization layer 10a on rod 10 to vary in accordance with the desired taper.

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Process for Fabricating Tapered Coaxial Transmission Lines

A tapered transmission line can be produced by withdrawing metal rod 10 of uniform diameter from anodizing bath 12. This is effected at a programmed rate so as to cause the anodization layer 10a on rod 10 to vary in accordance with the desired taper.

Anodization forms an insulating dielectric layer 10a on the surface of rod 10. The depth of layer 10a can be controlled by the strength of bath 12 and the amount of time that rod 10 is left in the bath. As a result, the diameter of unanodized inner portion 10b of rod 10 also varies with its length.

The unanodized portion 10b of rod 10 can then be used as an inner conductor of a coaxial transmission line while layer 10a functions as the insulating layer between the inner and outer conductors for the transmission line. To complete the coaxal line, outer conductor 14 is formed on rod 10 by any desired method such as braiding, extruding, plating or wrapping.

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