Surface-treated copper foil for high-frequency circuit and method for producing the same
AssigneeCircuit Foil Luxembourg
InventorsRoman MICHEZ, Michel STREEL
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Abstract
A surface treated copper foil for a High-Frequency circuit as well as a corresponding method of treating a copper foil, the copper foil including two opposite sides, where a first side is coated with a treatment layer including, in this order: a first layer including oxides of Mo and of Zn deposited on the first side, where the first layer is free of Ni; a second layer of Cr oxide; and a coupling agent layer; where the first layer includes the oxides of Mo and of Zn in a quantity of between 5 and 30 mg/m2 calculated as Mo and Zn; where the treatment layer has a roughness Rz JIS of 0.7 μm or less; and where the first side is free of roughening treatment.
Claims25
A surface treated copper foil for a High-Frequency circuit, the copper foil comprising two opposite sides, wherein a first side is coated with a treatment layer comprising, in this order:
- a first layer comprising oxides of Mo and of Zn deposited on said first side, wherein said first layer is free of Ni;
- a second layer of Cr oxide;
- and
- a third layer being a coupling agent layer;
- wherein the first layer comprises the oxides of Mo and of Zn in a quantity of between 5 and 30 mg/m2 calculated as Mo and Zn;
- wherein said treatment layer has a roughness Rz JIS of 0.7 μm or less;
- and
- wherein said first side is free of roughening treatment.
A method of treating a copper foil comprising:
- providing a copper foil having two opposite sides;
- coating a first side of the copper foil with a treatment layer, said coating comprising:
- in a first bath, electrodepositing a first layer of oxides of Zn and of Mo, said first bath comprising between 1.5 and 7 g/L of Mo and between 1 and 5 g/L of Zn, the first bath being free of Ni;
- in a second bath, electrodepositing a second layer of Cr oxide over said first layer;
- in a third bath, forming a third layer being a coupling agent layer over said second layer.
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Dependencies are inferred from the claim text.