Electrical interconnect having a multi-layer circuit board structure and including a conductive spacer for impedance matching
First Claim
1. An electrical interconnect comprising:
- circuit board structure having multiple layers each including a substrate and a wiring pattern extending along at least one surface of the substrate, and the circuit board structure having a first transmission line constituted by the wiring pattern extending along a surface of one of said layers, and a second transmission line constituted by the wiring pattern extending along a surface of another of said layers;
a signal line extending from said first transmission line to said second transmission line in a vertical direction through said circuit board structure so as to form an electrical interconnection of said transmission lines;
an electrical ground conductor that is substantially thicker than said wiring patterns and is interposed between respective ones of the layers of the circuit board structure intermediate said layers having the surfaces along which the first and second transmission lines extend, said electrical ground conductor having a through-hole in which said signal line resides as spaced from the ground conductor; and
a dielectric medium occupying said through-hole and substantially circumferentially surrounding said signal line, wherein said ground conductor and said dielectric medium form a coaxial structure in the vertical direction.
1 Assignment
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Accused Products
Abstract
An electrical interconnect having a multi-layer circuit board structure is designed to facilitate source and load impedance matching. The circuit board structure has a first transmission line extending along a surface of one of the layers, and a second transmission line extending along a surface of another of the layers. A signal line connects the first transmission line to the second transmission line in the vertical direction of the circuit board structure. A conductive ground spacer is interposed between respective layers of the circuit board structure and has a through-hole in which the signal line resides. A dielectric medium, such as air, occupies the through-hole and substantially circumferentially surrounds the signal line. Accordingly, the ground conductor, the signal line and the dielectric medium form a coaxial structure in the vertical direction, by which it is easy to provide a desired characteristic impedance.
11 Citations
10 Claims
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1. An electrical interconnect comprising:
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circuit board structure having multiple layers each including a substrate and a wiring pattern extending along at least one surface of the substrate, and the circuit board structure having a first transmission line constituted by the wiring pattern extending along a surface of one of said layers, and a second transmission line constituted by the wiring pattern extending along a surface of another of said layers;
a signal line extending from said first transmission line to said second transmission line in a vertical direction through said circuit board structure so as to form an electrical interconnection of said transmission lines;
an electrical ground conductor that is substantially thicker than said wiring patterns and is interposed between respective ones of the layers of the circuit board structure intermediate said layers having the surfaces along which the first and second transmission lines extend, said electrical ground conductor having a through-hole in which said signal line resides as spaced from the ground conductor; and
a dielectric medium occupying said through-hole and substantially circumferentially surrounding said signal line, wherein said ground conductor and said dielectric medium form a coaxial structure in the vertical direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification