An FDTD Method for the Transient Terminal Response of Twisted-Wire Pairs Illuminated by an External Electromagnetic Field

Yan, Yonghong; Meng, Lin; Liu, Xiaolong; Jiang, Tingyong; Jin, Chen; Zhang, Gengjing

doi:10.1109/temc.2017.2729662

Cited by 17 publications

(7 citation statements)

References 14 publications

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“…Therefore, TPs with lower twist pitch length can be placed closer to each other. Yan et al 11 proposed a finite-difference time-domain (FDTD) algorithm to estimate the coupling of external EM waves (1.5–6 GHz) to TP cables. In this reference, it is observed that the interference is maximum when the wavelength is half-integer or integer multiple of the twist pitch length.…”

Section: Introductionmentioning

confidence: 99%

Investigating the upper bound of high-frequency electromagnetic waves on unshielded twisted copper pairs

et al. 2022

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This paper explores the behaviour of the ubiquitous twisted pairs at high frequencies and wideband excitation of twisted pairs up to 12 GHz. Higher carrier frequencies on twisted pairs can enable the data rates required by the future communication networks; hence, the existing copper infrastructure can be utilised on the last mile complementing the fibre networks. In this paper, we show a fundamental limit on the operating frequency of twisted pairs beyond which twisted pairs start to radiate and behave like an antenna. To validate our theoretical derivations through measurements, we designed a microstrip balun to excite the differential mode on the twisted pairs. At the end, we demonstrate that the standard twisted pairs used in the UK can be used up to 5 GHz carrier frequency without any radiation effect and this upper-bound can be moved to higher frequencies by decreasing the twist lengths.

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Section: Introductionmentioning

confidence: 99%

Investigating the upper bound of high-frequency electromagnetic waves on unshielded twisted copper pairs

et al. 2022

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“…Therefore, TPs with lower pitch length can be placed closer to each other. Yan et al 11 proposed a finite-difference time-domain (FDTD) algorithm to estimate the coupling of external electromagnetic (EM) waves (1.5-6GHz) to TP cables. In this reference, it is observed that the interference is maximum when the wavelength is half-integer or integer multiple of the twist pitch.…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Electromagnetic Waves on Unshielded Twisted Pairs: Upper Bound on Carrier Frequency

Dinc,

Bukhari,

Rawi

et al. 2021

Preprint

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This paper explores the behaviour of the ubiquitous twisted pairs at high frequencies and wideband excitation of twisted pairs up to 12GHz. Although there is a large quantity of papers on twisted pairs, the papers in the literature mostly focus on the sub-1GHz spectrum, where the current digital subscriber line technologies operate. Higher carrier frequencies on twisted pairs can enable the data rates required by the future communication networks; hence, the existing copper infrastructure can be utilised on the last mile complementing the fibre networks. Towards this objective, we derive analytical expression for the electromagnetic fields and characteristic equation of twisted pairs. With these derivations we show a fundamental limit on the operating frequency of twisted pairs beyond which twisted pairs start to radiate and behave like an antenna. To validate our theory through measurements, we designed a microstrip balun in order to excite the differential mode on the twisted pairs. Unlike off-the-shelf devices, this balun has a nearly linear transmission curve across 1-12GHz. This linearity allows us to detect the radiation which would not have been possible with an off-the-shelf device. At the end, we demonstrate that the standard twisted pairs used in the UK can be used up to 5GHz carrier frequency without any radiation effect and this upper-bound can be moved to higher frequencies by decreasing the twist lengths.

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“…Twisted-wire pair (TWP) is the most widely used stranded wire because of its strong antiinterference ability to conducted noise [1]. The electromagnetic interference of the field coupling to the TWP has been explored in a large amount of literature [2]- [4]. Crosstalk of TWP has been studied by scholars as early as 1960s [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis on RLCG Parameter Matrix Extraction for Multi-Core Twisted Cable Based on Back Propagation Neural Network Algorithm

et al. 2019

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A new method based on back propagation (BP) neural network for extracting RLCG parameter matrix of multi-core twisted cable is presented. With the properly selected parameter matrix sample, the variation characteristics of the parameter matrix of the multi-core twisted cable can be learned by the Levenberg-Marquardt (L-M) algorithm based on BP neural network. The proposed method is combined with the finite-difference time-domain (FDTD) method to calculate the near end crosstalk (NEXT) and the far end crosstalk (FEXT) of the multi-core twisted cable. To verify the new method, a three-core twisted cable is measured and analyzed in the frequency band of 100 kHz-1 GHz. The results show that the verification error of the extraction network of the RLCG parameter matrix has good accuracy, which does not exceed 0.8%. Compared with the full wave method, the maximum deviations of FEXT and NEXT solved by the proposed methods are −2.71 dB and 10.56 dB, respectively, which are better than 29.32 dB and 32.45 dB solved by the conventional method. INDEX TERMS Multi-core twisted cable, crosstalk, finite-difference time-domain (FDTD) method, neural network.

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An FDTD Method for the Transient Terminal Response of Twisted-Wire Pairs Illuminated by an External Electromagnetic Field

Cited by 17 publications

References 14 publications

Investigating the upper bound of high-frequency electromagnetic waves on unshielded twisted copper pairs

Investigating the upper bound of high-frequency electromagnetic waves on unshielded twisted copper pairs

High-Frequency Electromagnetic Waves on Unshielded Twisted Pairs: Upper Bound on Carrier Frequency

Analysis on RLCG Parameter Matrix Extraction for Multi-Core Twisted Cable Based on Back Propagation Neural Network Algorithm

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