Telecommunications jack with crosstalk compensation provided on a multi-layer circuit board
View Patent ↗The present disclosure relates to a telecommunications jack including a housing having a port for receiving a plug. The jack also includes a plurality of contact springs adapted to make electrical contact with the plug when the plug is inserted into the port of the housing, and a plurality of wire termination contacts for terminating wires to the jack. The jack further includes a circuit board that electrically connects the contact springs to the wire termination contacts. The circuit board includes first and second conductive layers separated by a relatively thin dielectric layer. The first and second conductive layers include a crosstalk compensation arrangement having spaced-apart capacitor members. The relatively thin dielectric layer allows a high level of capacitance to be generated between the capacitor members.
1. A telecommunications jack comprising:
a housing defining a port for receiving a plug;
a plurality of contact springs adapted to make electrical contact with the plug when the plug is inserted into the port of the housing;
a plurality of wire termination contacts for terminating wires to the jack;
a circuit board that electrically connects the contact springs to the wire termination contacts, the circuit board including first and second conductive layers separated by a first dielectric layer, the first dielectric layer having a thickness less than 0.01 inches; and
the first and second conductive layers including a cross talk compensation arrangement including spaced-apart capacitor members, the capacitor members being separated by the first dielectric layer.
2. The telecommunications jack of claim 1 , wherein the first dielectric layer has a thickness less than 0.0075 inches.
3. The telecommunications jack of claim 1 , wherein the first dielectric layer has a thickness less than 0.005 inches.
4. The telecommunications jack of claim 1 , wherein the first dielectric layer has a thickness less than 0.003 inches.
5. The telecommunications jack of claim 1 , wherein the first dielectric layer includes FR-4 circuit board material.
6. The telecommunications jack of claim 1 , wherein the first dielectric layer has a dielectric constant equal to or less than 5.
7. The telecommunications jack of claim 1 , wherein the capacitor members comprise opposing plates.
8. The telecommunications jack of claim 1 , further comprising a third conductive layer separated from the second conductive layer by a second dielectric layer, the second dielectric layer being thicker than the first dielectric layer.
9. The telecommunications jack of claim 8 , wherein the second dielectric layer is at least 2.5 times thicker than the first dielectric layer.
10. The telecommunications jack of claim 8 , wherein the first and second dielectric layers have different dielectric constants.
11. The telecommunications jack of claim 8 , wherein a capacitive coupling is provided at the third conductive layer.
12. The telecommunications jack of claim 11 , wherein the capacitive coupling is provided by capacitor fingers.
13. A telecommunications jack adapted to receive a plug, the telecommunications jack having a compensation arrangement that compensates for cross talk generated at the plug, the telecommunications jack comprising:
a housing defining a port for receiving the plug;
first, second, third, fourth, fifth, sixth, seventh and eighth consecutively arranged contact springs adapted to make electrical contact with the plug when the plug is inserted into the port of the housing;
first, second, third, fourth, fifth, sixth, seventh and eighth wire termination contacts for terminating wires to the jack;
a circuit board including first, second, third, fourth, fifth, sixth, seventh and eighth tracings that respectively electrically connect the first, second, third, fourth, fifth, sixth, seventh and eighth contact springs to the first, second, third, fourth, fifth, sixth, seventh and eighth wire termination contacts, the circuit board including first and second conductive layers separated by a first dielectric layer, the first dielectric layer having a thickness less than 0.01 inches; and
a first compensation zone provided at the first and second conductive layers, the first compensation zone including first opposing capacitor plates providing a first capacitive coupling, the first capacitive coupling being made between the third and fifth tracings, the first opposing capacitor plates being separated by the first dielectric layer, the first compensation zone also including second opposing capacitor plates providing a second capacitive coupling, the second capacitive coupling being made between the fourth and sixth tracings, the second opposing capacitor plates being separated by the first dielectric layer;
a second compensation zone provided at the first and second conductive layers, the second compensation zone including third opposing capacitor plates providing a third capacitive coupling, the third capacitive coupling being made between the third and fourth tracings, the third opposing capacitor plates being separated by the first dielectric layer, the second compensation zone also including fourth opposing capacitor plates providing a fourth capacitive coupling, the fourth capacitive coupling being made between the fifth and sixth tracings, the fourth opposing capacitor plates being separated by the first dielectric layer; and
a third compensation zone providing a fifth capacitive coupling and a sixth capacitive coupling, the fifth capacitive coupling being made between the third and fifth tracings, and the sixth capacitive coupling being made between the fourth and sixth tracings.
14. The telecommunications jack of claim 13 , wherein the first dielectric layer has a thickness less than 0.0075 inches.
15. The telecommunications jack of claim 13 , wherein the first dielectric layer has a thickness less than 0.005 inches.
16. The telecommunications jack of claim 13 , wherein the first dielectric layer has a thickness less than 0.003 inches.
17. The telecommunications jack of claim 13 , wherein the fifth capacitive coupling is provided by fifth opposing capacitor plates separated by the first dielectric layer, and the sixth capacitive coupling is provided by sixth opposing capacitor plates separated by the first dielectric layer.
18. The telecommunications jack of claim 17 , further comprising a third conductive layer separated from the second conductive layer by a second dielectric layer, and wherein the third compensation zone further includes first capacitor fingers provided at the third conductive layer that assist in providing the fifth capacitance, and second capacitor fingers provided at the third conductive layer that assist in providing the sixth capacitance.
19. The telecommunications jack of claim 18 , wherein the second dielectric layer is at least 5 times thicker than the first dielectric layer.
20. A telecommunications jack comprising:
a housing defining a port for receiving a plug;
a plurality of contact springs adapted to make electrical contact with the plug when the plug is inserted into the port of the housing;
a plurality of wire termination contacts for terminating wires to the jack;
a circuit board that electrically connects the contact springs to the wire termination contacts, the circuit board including a first side defined by a first outer conductive layer and a second side defined by a second outer conductive layer, the circuit board also including an intermediate conductive layer, the first outer conductive layer being separated from the intermediate conductive layer by a first dielectric layer, the second outer conductive layer being separated from the intermediate conductive layer by a second dielectric layer, the second dielectric layer having a greater thickness than the first dielectric layer;
the first and second conductive layers including a cross talk compensation arrangement including first spaced-apart capacitor members, the first spaced-apart capacitor members being separated by the first dielectric layer; and
the contact springs being mounted at the first side of the circuit board and the wire termination contacts being mounted at the second side of the circuit board.
21. The telecommunications jack of claim 20 , wherein the compensation arrangement further comprises second spaced-apart capacitor members provided at the third conductive layer.