Method of making coaxial transmission lines on a printed circuit

Details Method of making coaxial transmission lines on a printed circuit Method of making coaxial transmission lines on a printed circuit

1998-04-16

1999-12-14

Young, Lee

Metal working

Method of mechanical manufacture

Electrical device making

29600, 29825, 333238, H01P 1100

Patent

active

060001208

ABSTRACT:
A method of forming a coaxial transmission line on a high density PCB. A metal strip (102) on the PCB (104) forms the bottom part of the shield, and is covered by a first dielectric (112). Two parallel trenches (122) are formed in the first dielectric to reveal part (123) of the metal strip. The signal conductor (132) is then formed on the first dielectric. A second dielectric (142) covers the signal conductor and the first dielectric. A second set of two parallel trenches (172) are formed in the second dielectric immediately above the first two trenches. Metal (182) is plated in the parallel trenches to contact the metal strip, and also covers a portion of the second dielectric that lies between the trenches, to create a shield. The resulting coaxial transmission line has a center conductor insulated from the shield by the dielectrics.

REFERENCES:
patent: 3613230 (1971-10-01), Griff
patent: 4460880 (1984-07-01), Turner
patent: 4776087 (1988-10-01), Cronin et al.
patent: 5461353 (1995-10-01), Eberhardt

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