Browse Prior Art Database

Transformer

IP.com Disclosure Number: IPCOM000092156D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Audretsch, LM: AUTHOR

Abstract

Tapered transmission line 10 of uniform constant impedance can be used in place of a transformer for making physical connections to printed circuit boards. Line 10 has its dimensions at one end 12 tapered down so it fits the lands on monolithic modules. However, the rest of the length 14 of the coaxial cable is large enough in diameter to provide the cable with the desirable low attenuation losses. The Zo of the line is a function of the log 10 of b/a where a is the diameter of the inner conductor and b is the inner diameter of the outer conductor or outer diameter of the dielectric layer. By maintaining b/a constant while reducing both a and b uniformly, a tapered transmission line with uniform impedance characteristics is realized.

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Transformer

Tapered transmission line 10 of uniform constant impedance can be used in place of a transformer for making physical connections to printed circuit boards. Line 10 has its dimensions at one end 12 tapered down so it fits the lands on monolithic modules. However, the rest of the length 14 of the coaxial cable is large enough in diameter to provide the cable with the desirable low attenuation losses. The Zo of the line is a function of the log 10 of b/a where a is the diameter of the inner conductor and b is the inner diameter of the outer conductor or outer diameter of the dielectric layer. By maintaining b/a constant while reducing both a and b uniformly, a tapered transmission line with uniform impedance characteristics is realized. This is done with controlled etching of the center conductor, electrophoretic deposition of the dielectric, and electroless copper plating of the outer conductor.

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