Apparatus for MIMO coupling power line signals into a three-conductor power supply network via two channels

Apparatus for coupling a modem to a power supply network for transmitting data via the power supply network, comprising:

• a mains connection configured to connect the apparatus with a phase conductor, a neutral conductor and a protective earth conductor of the power supply network,
• a first transformer element comprising a primary side winding, a first secondary side winding and a second secondary side winding,
• a second transformer element comprising a primary side winding, a first secondary side winding and a second secondary side winding,
• wherein the primary side winding of the first transformer element is connected in series to the primary side winding of the second transformer element,
• wherein the first secondary side winding of the second transformer element is connected in series to the second secondary side winding of the first transformer element,
• wherein the first secondary side winding of the first transformer element is connected in series to the second secondary side winding of the second transformer element,
• a first primary side contact that is arranged at the end of the primary side winding of the first transformer element facing away from the primary side winding of the second transformer element,
• a second primary side contact that is arranged at the end of the primary side winding of the second transformer element facing away from the primary side winding of the first transformer element,
• a third primary side contact that is arranged between the primary side winding of the first transformer element and the primary side winding of the second transformer element,
• a first secondary side contact that is arranged at the end of the first secondary side winding of the first transformer element facing away from the second secondary side winding of the second transformer element,
• a second secondary side contact that is arranged at the end of the second secondary side winding of the second transformer element facing away from the first secondary side winding of the first transformer element,
• a third secondary side contact that is arranged at the end of the second secondary side winding of the first transformer element facing away from the first secondary side winding of the second transformer element,
• a fourth secondary side contact that is arranged at the end of the first secondary side winding of the second transformer element facing away from the second secondary side winding of the first transformer element,
• wherein the first primary side contact, the second primary side contact and the third primary side contact are each configured to be connected via the mains connection to a different conductor chosen in each case from the phase conductor, the neutral conductor and the protective earth conductor of the power supply network,
• wherein the apparatus is configured to couple at least in terms of high frequency a first secondary side transmission channel, which is formed between the first and second secondary side contact, to the power supply network via the first and second transformer element;
• and
• wherein the apparatus is configured to couple at least in terms of high frequency a second secondary side transmission channel, which is formed between the third and fourth secondary side contact, to the power supply network via the first and second transformer element.