Transmission of the maximum number of signals through a multiconductor transmission line without crosstalk or return loss: theory and simulation

Abstract

Multiconductor communication is widely used in electronic applications for fast data transfer between different devices. The most common multiconductor transmission media are Cat 6 Ethernet cables, flat cables, and backplanes. In all applications, the data is transferred differentially between pairs of conductors, so that roughly the number of transmitted signals is half the number of conductors. Physically, between N + 1 conductors it is possible to transmit N signals and the reason for not doing so is the huge crosstalk and return loss that would arise when transmitting so many signals. The current work suggests an algorithm for transmitting the maximum number of possible signals without crosstalk or return loss.

Analysis of lossy multiconductor transmission lines and application of a crosstalk cancelling algorithm

“…The full details of this theoretical background are in [1], and we show here the main results that we need in this work.…”

“…In a previous work [1], we derived an algorithm for transmitting the maximum possible number of signals without crosstalk or return loss, in lossless multiconductor transmission lines (MTL). Using this algorithm on an MTL of conductors, one is able to transmit N independent unaltered signals.…”

“…The outline is as follows: In Section 2, we explain the theoretical background developed in [1] and point on the changes that occur in the lossy case. Some classification of modes according to their immunity to noise is also presented.…”

“…In Section 5, we show that although modes of MTL do not need to match results of two‐conductor MTL, we get a good match between them, in cases this is physically justified. In Section 6, we apply the crosstalk cancelling algorithm developed in [1] to the lossy case and examine its performance. The work is ended by some concluding remarks.…”

Radiation from quasi‐TEM insulated transmission lines

“…Looking at the figures, we understand that as n eq is bigger, the function Z(kL, n eq , n) decreases, while for a given n eq , bigger transverse polarisation currents (bigger ǫ p , hence smaller n), further decrease Z(kL, n eq , n). From (13) and (19), the expression for the radiated power is P + rad = 60 Ω|I + | 2 (kd) 2 Z(kL, n eq , n)…”