Transmission device using a plurality of elementary return conductors

A device for transmission providing, in a known frequency band, m transmission channels each corresponding to a signal to be sent from the input of at least one transmitting circuit to the output of at least one receiving circuit, where m is an integer greater than or equal to 2, the device for transmission comprising:

• an interconnection comprising n transmission conductors numbered from 1 to n, the interconnection comprising r elementary return conductors numbered from 1 to r, n being an integer greater than or equal to m and r being an integer greater than or equal to 3, the interconnection being structurally combined with one or more elementary reference conductors throughout the length of the interconnection, the interconnection being such that, at a given point along the interconnection, in a section of the interconnection and of the elementary reference conductors in a plane orthogonal to the direction of propagation of signals in the interconnection, for any integer j greater than or equal to 1 and less than or equal to r−1 and to n, the distance between the transmission conductor number j and the elementary return conductor number j and the distance between the transmission conductor number j and the elementary return conductor number j+1 are both less than the shortest distance between the transmission conductor number j and any other transmission conductor of the interconnection and less than the distance between the elementary return conductor number j and the elementary return conductor number j+1;
• at least one said transmitting circuit receiving m input signals of the transmitting circuit corresponding each to a transmission channel, the output of said at least one said transmitting circuit being coupled to the n transmission conductors;
• at least one said receiving circuit delivering, when said at least one said receiving circuit is in the activated state, m output signals of the receiving circuit corresponding each to a transmission channel, said at least one said receiving circuit comprising n signal terminals, a common terminal and a reference terminal, each of the signal terminals being coupled to one and only one of the transmission conductors, the common terminal being coupled to each of the elementary return conductors, the reference terminal being connected to each of the elementary reference conductors, each of the output signals of the receiving circuit being mainly determined by one or more of the voltages between one of the signal terminals and the common terminal.