Circuit board with grooves and coaxial circuits formed therein

Details Circuit board with grooves and coaxial circuits formed therein Circuit board with grooves and coaxial circuits formed therein

H - Electricity

05

K

356/18

H05K 1/00 (2006.01) H05K 1/02 (2006.01) H05K 3/00 (2006.01) H05K 3/10 (2006.01) H05K 3/20 (2006.01)

Patent

CA 1289680

CIRCUIT BOARD WITH GROOVES AND COAXIAL CIRCUITS FORMED THEREIN Abstract of the Disclosure A circuit board having coaxial circuits and a method for making a circuit board of that type. A circuit board having grooves in its upper surface is made according to known techniques. Next, an inner conductor for the coaxial circuits is made. A copper backing plate, holding what will become the inner conductors, is produced. The grooves which are to receive coaxial circuits are partially filled with a fluid insulator. The copper backing plate is placed above the groove on the circuit board and lowered such that the copper tracks enter into the grooves on the circuit board and are centered within the recessed circuitry of the circuit board. The assembly is then cured by heat such that the epoxy becomes a solid and holds the copper tracks in place. The assembly is put into an etching tank which will react only with the copper so that the total copper backing plate is removed, leaving only the copper tracks embedded in the grooves. - i -

589174

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