An improved model for the transfer impedance calculations of braided coaxial cables

Abstract

A new model is presented for the accurate predictions of transfer impedance of braided coaxial cables, from a summary study on the earlier models proposed. The complicated responses on the braided shields due to the radiation from the exterior produced electromagnetic fields are taking into account in the new model. In addition, the diameter of braid is rebuilt to improve the accuracy of inductance. The formulas have a close relationship with the primary parameters of braided shield. The accuracy of the new model is studied against the calculation values for transfer impedance obtained from the earlier models proposed by Tyni, S.Sali, Kley and the measurement results of several braided cable samples.

Advanced models for the transfer impedance of metal braids in cable harnesses

“…Schippers [15], [16] has shown that the magnetic polarizability in the hole inductance models of Vance and Kley is overestimated. In these models, the area of the rhombic aperture is approximated by the surface of an elliptical hole: / 4, e S lw (19) with l the major axis and w the minor axis of the ellipse.…”

“…3) Wang Xiaoling Another improvement for modelling braid inductance has been proposed by Wang in [16], who calculates M b as follows: . The number of holes υ per unit length is in general large.…”

“…Then, (35) reduces to (27). In [16] the area S between the carriers is approximated by: with b once again the width of the split between two carriers. The average height follows from the simultaneous solution of (31) and:…”

“…Since the development of the model for transfer impedance of metal braids by E.F. Vance [6], a large number of authors have tried to improve the different parts of this model to make it more accurate and more reliable. Among them are Tiny [7], Sali [10], Kley [9], Katakis [8], Wang [16] and Schippers [17] [18]. In the next sections the characteristics and limitations of the various available models for diffusion, as well as braid, hole and skin inductance will be addressed.…”

Shield Reliability Analysis-Based Transfer Impedance Optimization Model for Double Shielded Cable of Electric Vehicle

“…e braided inductance part was introduced by Tyni [4] to improve the accuracy when calculating the transfer impedance of high and low projection coverage cables; Demoulin and Degauque [5] proposed a new model that took into account the effects of additional fluctuations and generated additional attenuation; Marconi et al [6] proposed a test method to measure the transfer impedance of two coaxial cables RG 213 under the same conditions and compared the test results with theoretical calculations; Xiaoling et al [7] proposed a new model for accurately predicting the transfer impedance of braided coaxial cables by summarizing and studying the classical model; Mushtaq and Frei [8,9] introduced the ground plate method (GPM) and capacitive voltage probe (CVP). He compared the test results of the above methods with the triaxial injection method and line injection method.…”