Abstract
Cables play an important role in transmitting energy and information. In this article, in order to obtain the S-parameters of the special twisted pair cable with rectangular connectors, a de-embedding method of the transmission matrix is proposed to deal with the two adapters ends of the cable. According to the frequency-dependent RLGC(f) model, the cable characteristics are extracted in the frequency range of 10 MHz to 200 MHz through conventional and modified methods respectively. The frequency-domain analysis shows that the inherent capacity of modified method can decrease the errors especially due to the discontinuities of hyperbolic functions. This research supplies an advantageous modelling approach for the cable to improve its robustness against disturbances in the S-parameters measurement that cannot be decreased with the calibration procedure.
Highlights
Twisted pair cables are widely used in various modern electronic devices and systems possessed with the characteristics of low cost, low loss, and low coupling, such as controller area network buses, communication systems, airplanes, and ships [1]
MATLAB software was used to carry out all the simulation and RLGC parameters of the cable were extracted respectively by conventional method (CM) and modified method (MM)
The S-parameters of a common twisted pair cable with connectors at both ends is measured with Vector Network Analyzer (VNA) and adapters
Summary
Twisted pair cables are widely used in various modern electronic devices and systems possessed with the characteristics of low cost, low loss, and low coupling, such as controller area network buses, communication systems, airplanes, and ships [1]. When the system frequency is in the hundreds of megahertz, or even as high as gigahertz, the cable is no longer a simple conductor, but exhibits a high-frequency effect, and behaves as a transmission line [2]. It is critical to establish an accurate frequency-dependent RLGC(f) model for cables in high-frequency range. The special cable used in this article is a twisted pair copper cable with rectangular connectors at both ends, which makes it difficult to obtain accurate RLGC parameters. In [3], Zhang et al presented three frequency-dependent RLGC(f) models, and took into account high-frequency effects, such as skin effect loss, dielectric dispersion and crosstalk. A good agreement of simulated and measured S-parameters has been achieved in the frequency domain for the three transmission lines by using the proposed frequency-
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