Communications connectors having frequency dependent communications paths and related methods
Communications connectors are provided that include a plurality of inputs that are arranged as differential pairs of inputs and a plurality of outputs that are arranged as differential pairs of outputs. A plurality of low frequency conductive paths are provided, each of which electrically connects a respective one of the inputs to a respective one of the outputs. These low frequency conductive paths are configured to pass signals having frequencies in a first frequency band while substantially attenuating signals having frequencies in a second frequency band that includes higher frequencies than the first frequency band. A plurality of second conductive paths are also provided. Each of the plurality of second conductive paths is electrically in parallel with at least a portion of a respective one of the low frequency conductive paths.
1. A communications connector, comprising:
a plurality of inputs that are arranged as differential pairs of inputs;
a plurality of outputs that are arranged as differential pairs of outputs;
a plurality of low frequency conductive paths that are configured to pass signals having frequencies in a first frequency band while substantially attenuating signals having frequencies in a second frequency band that includes higher frequencies than the first frequency band, each of the low frequency conductive paths electrically connecting a respective one of the inputs to a respective one of the outputs; and
a plurality of second conductive paths, wherein each of the plurality of second conductive paths is electrically in parallel with at least a portion of a respective one of the low frequency conductive paths.
2. The communications connector of claim 1 , wherein the second conductive paths comprise a plurality of high frequency conductive paths that are configured to pass signals having frequencies in the second frequency band.
3. The communications connector of claim 2 , wherein the inputs comprise input contacts that are configured to receive the respective conductors of a communications cable, and wherein the outputs comprise output contacts that are configured to mate with the respective contacts of a mating communications connector.
4. The communications connector of claim 3 , wherein the communications connector is a communications plug that is connected to the communications cable, and wherein the communications cable includes at least four differential pairs of insulated conductors and wherein the low frequency conductive paths comprise four pairs of tip and ring low frequency conductive paths.
5. The communications connector of claim 4 , further comprising a printed circuit board, wherein the input contacts and the output contacts are each mounted on the printed circuit board.
6. The communications connector of claim 5 , wherein at least some of the high frequency conductive paths are at least partially on an inner layer of the printed circuit board.
7. The communications connector of claim 4 , wherein a low pass filter is provided on each of the low frequency conductive paths and a high pass filter or bandpass filter is provided on each of the high frequency conductive paths.
8. The communications connector of claim 4 , further comprising a reactive circuit between a first of the tip low frequency conductive paths and a first of the ring low frequency conductive paths.
9. The communications connector of claim 8 , wherein the first of the tip low frequency conductive paths is connected to a first of the output contacts and the first of the ring low frequency conductive paths is connected to a second of the output contacts, and wherein the first and second of the output contacts comprise adjacent output contacts.
10. The communications connector of claim 4 , further comprising a reactive circuit between a first of the tip high frequency conductive paths and a second of the tip high frequency conductive paths or between a first of the ring high frequency conductive paths and a second of the ring high frequency conductive paths.
11. The communications connector of claim 4 , wherein the output contacts are arranged as four differential pairs of output contacts, the communications connector further comprising a first capacitor that injects crosstalk between a first and a second of the differential pairs of output contacts that has the same polarity as the net crosstalk injected between the first and the second differential pairs of output contacts.
12. The communications connector of claim 2 , wherein the low frequency conductive paths are configured to pass signals having frequencies between at least 1 MHz and 500 MHz, and wherein the high frequency conductive paths are configured to pass signals having frequencies within at least part of the frequency band between 500 MHz and 3 GHz.
13. The communications connector of claim 2 , wherein the first and second frequency bands do not overlap.
14. The communications connector of claim 2 , wherein each of the high frequency conductive paths electrically connect a respective one of the inputs to a respective one of the outputs.
15. The communications connector of claim 1 , in combination with a communications cable that has a plurality of conductors, wherein the communications connector is attached to an end of the communications cable to provide a patch cord, and wherein each of the plurality of inputs is electrically connected to a respective one of the conductors of the communications cable.
16. The communications connector of claim 1 , further comprising a splitter circuit that connects each of the low frequency conductive paths and each of the second conductive paths to respective ones of the inputs and a combiner circuit that connects each of the low frequency conductive paths and each of the second conductive paths to respective ones of the outputs.
17. The communications connector of claim 1 , further comprising a crosstalk circuit that is configured to inject crosstalk having the same polarity as crosstalk that is injected between a first of the differential pair of inputs and a second of the differential pair of inputs.