Apparatus for coupling radio-frequency signals to and from a cable of a power distribution network
First Claim
1. A radio frequency injection system for inserting a radio frequency signal onto a high-voltage cable of a power distribution system where the power distribution system has a neutral wire connected between a neutral node and a remote neutral node, the radio frequency injection system comprising:
- a radio frequency transmitter having an output terminal with a radio frequency transmit signal, radio frequency transmitter further having a neutral terminal connected to the neutral node;
a radio frequency coupler having a high-voltage terminal and a low-voltage terminal, where the high-voltage terminal is coupled to the high-voltage cable and the low-voltage terminal is connected to the output of the radio frequency transmitter for receiving the radio frequency transmit signal;
a copper wire mounted on a pole serves as an output impedance having one end connected to the low-voltage terminal of the radio frequency coupler and having the other end connected to the neutral node; and
a low radio frequency impedance path between the neutral note and the remote neutral node where the low radio frequency impedance serves as a return path for the radio frequency signal, wherein said low radio frequency impedance path is the neutral wire; and
wherein the radio frequency signal couples frequencies between one Megahertz and two hundred Megahertz.
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Accused Products
Abstract
A coupling system for transferring a RF signal to and from a high-voltage cable (302) of a power distribution system is described. In one embodiment the coupling system uses a lightning arrester (314) as an element for coupling a RF signal from a RF modem (420) to and from the high-voltage cable. An impedance element of the coupling system is a section of a grounding cable (309) modified with one or more ferrite cores (430) as a means for adjusting the value of the impedance.
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Citations
12 Claims
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1. A radio frequency injection system for inserting a radio frequency signal onto a high-voltage cable of a power distribution system where the power distribution system has a neutral wire connected between a neutral node and a remote neutral node, the radio frequency injection system comprising:
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a radio frequency transmitter having an output terminal with a radio frequency transmit signal, radio frequency transmitter further having a neutral terminal connected to the neutral node; a radio frequency coupler having a high-voltage terminal and a low-voltage terminal, where the high-voltage terminal is coupled to the high-voltage cable and the low-voltage terminal is connected to the output of the radio frequency transmitter for receiving the radio frequency transmit signal; a copper wire mounted on a pole serves as an output impedance having one end connected to the low-voltage terminal of the radio frequency coupler and having the other end connected to the neutral node; and a low radio frequency impedance path between the neutral note and the remote neutral node where the low radio frequency impedance serves as a return path for the radio frequency signal, wherein said low radio frequency impedance path is the neutral wire; and wherein the radio frequency signal couples frequencies between one Megahertz and two hundred Megahertz. - View Dependent Claims (2, 3, 4)
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5. In a data communication system having a high-voltage cable for coupling a radio frequency signal onto the high-voltage cable, said system comprising:
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a radio frequency transmitter with an output terminal and a reference terminal with the reference terminal connected to a neutral node, the radio frequency transmitter including the radio frequency signal; a radio frequency coupler having a high-voltage terminal coupled to the high-voltage cable, the radio frequency coupler further having a low-voltage terminal coupled to the output terminal of the transmitter; a copper wire mounted on a pole serves as an output impedance having a first terminal and a second terminal, where the first terminal is connected to the low-voltage terminal of the radio frequency coupler and the second terminal is connected to the neutral node; a low radio frequency impedance path between the neutral node and a remote neutral node where the low radio frequency impedance serves as a return path for the radio frequency signal; and
wherein said low radio frequency impedance path is a neutral wire of a power distribution system connected between the neutral node and the remote neutral node;a high radio frequency impedance path between the neutral node and earth ground; wherein the radio frequency signal has frequencies between one Megahertz and two hundred Megahertz. - View Dependent Claims (6, 7, 8)
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9. In a data communication system having a high-voltage cable for coupling a radio frequency signal onto an input terminal of a radio frequency receiver, said system comprising:
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a radio frequency transmitter with the radio frequency signal; the radio frequency receiver with the input terminal and a reference terminal with the reference terminal connected to a neutral node; a radio frequency coupler having a high-voltage terminal coupled to the high-voltage cable, the radio frequency coupler further having a low-voltage terminal coupled to the input terminal of the receiver; a copper wire mounted on a pole serves as an output impedance having a first terminal and a second terminal, where the first terminal is connected to the low-voltage terminal of the radio frequency coupler and the second terminal is connected to the neutral node; a low radio frequency impedance path between the neutral node and a remote neutral node at the radio frequency source, where the low radio frequency impedance serves as a return path for the radio frequency signal; and
wherein said low radio frequency impedance path is a neutral wire of a power distribution system connected between the neutral node and the remote neutral node;wherein the radio frequency signal has frequencies between one Megahertz and two hundred Megahertz. - View Dependent Claims (10, 11, 12)
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Specification