Microwave circuit boards

Details Microwave circuit boards Microwave circuit boards

1984-11-09

1986-12-30

Grimley, A. T.

Electricity: conductors and insulators

Conduits, cables or conductors

Single duct conduits

427 97, 428901, H05K 103

Patent

active

046330356

ABSTRACT:
Circuit boards, useful in microwave frequency applications, are formed from a laminate consisting initially of an insulator sandwiched between a copper foil and an aluminum plate. The boards are provided with through-hole connections by means of a procedure which includes drilling through the board to form through-holes, anodizing all exposed surfaces of the aluminum, electroplating copper over all anodized aluminum surfaces, sodium or plasma etching to alter the surface of the walls of the holes in the insulator to allow them to be "wet", and electroless copper plating the entire board to form a continuous upper coating over the copper foil, the copper plate and the walls of the through-holes.

REFERENCES:
patent: 3694250 (1972-09-01), Grunwald
patent: 4293377 (1981-10-01), Miyajima
patent: 4372804 (1983-02-01), Hanabusa et al.
patent: 4389278 (1983-06-01), Kai
patent: 4525247 (1985-06-01), McMonagle

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