Communications jacks having conductive paths with the same current direction that inductively and capacitively couple
First Claim
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1. A communications jack, comprising:
- a first conductive path electrically connecting a first input of the jack and a first output of the jack;
a second conductive path electrically connecting a second input of the jack and a second output of the jack, wherein the first and second conductive paths comprise a first differential pair of conductive paths for transmitting a first information signal;
a third conductive path electrically connecting a third input of the jack and a third output of the jack;
a fourth conductive path electrically connecting a fourth input of the jack and a fourth output of the jack, wherein the third and fourth conductive paths comprise a second differential pair of conductive paths for transmitting a second information signal; and
a return loss improvement circuit that comprises a first section of the first conductive path and a second section of the second conductive path that has the same instantaneous current direction as the first section of the first conductive path, wherein the first section and the second section are positioned to both capacitively and inductively couple with each other.
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Abstract
Communications jacks include a housing having a plug aperture that is configured to receive a mating RJ-45 plug along a longitudinal axis and eight jackwire contacts that are arranged as four differential pairs of jackwire contacts, each of the jackwire contacts including a plug contact region that extends into the plug aperture. A first of the jackwire contacts is configured to engage a longitudinally extending surface of a first blade of a mating RJ-45 plug when the mating RJ-45 plug is fully received within the plug aperture.
52 Citations
16 Claims
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1. A communications jack, comprising:
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a first conductive path electrically connecting a first input of the jack and a first output of the jack; a second conductive path electrically connecting a second input of the jack and a second output of the jack, wherein the first and second conductive paths comprise a first differential pair of conductive paths for transmitting a first information signal; a third conductive path electrically connecting a third input of the jack and a third output of the jack; a fourth conductive path electrically connecting a fourth input of the jack and a fourth output of the jack, wherein the third and fourth conductive paths comprise a second differential pair of conductive paths for transmitting a second information signal; and a return loss improvement circuit that comprises a first section of the first conductive path and a second section of the second conductive path that has the same instantaneous current direction as the first section of the first conductive path, wherein the first section and the second section are positioned to both capacitively and inductively couple with each other. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling the return loss on a differential transmission line that includes a first conductive path and a second conductive path of an RJ-45 communications connector, the method comprising:
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routing a first section of the first conductive path and a first section of the second conductive path so that the first and second sections have substantially the same instantaneous current direction and so that the first and second sections both capacitively and inductively couple with one another; controlling the amount of capacitive coupling between the first section and the second section and the amount of inductive coupling between the first section and the second section to improve the return loss of the transmission line. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A communications jack, comprising:
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a housing having a plug aperture; a flexible printed circuit board that is at least partly mounted within the housing; a first conductive path electrically connecting a first input of the jack and a first output of the jack; a second conductive path electrically connecting a second input of the jack and a second output of the jack, wherein the first and second conductive paths comprise a first differential pair of conductive paths; wherein the first conductive path includes first and second conductive trace sections on the flexible printed circuit board that are immediately adjacent to each other and that have generally the same instantaneous current direction such that the first and second conductive trace sections self-couple and cause a localized increase in inductance, and wherein the first conductive trace section is on a first side of the flexible printed circuit board and the second conductive trace section is on a second side of the flexible printed circuit board that is opposite the first side, and wherein the first and second conductive trace sections are configured to both inductively and capacitively couple into each other. - View Dependent Claims (14, 15, 16)
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Specification