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A Simple Method for Estimation of Surface Transfer Impedance of Coaxial Cables as Per MIL STD 1377 for EMC Qualification

P. Raghunadha Reddy, K. Chandra Bhushana Rao

Abstract


In recent years, electromagnetic compatibility (EMC) problems associated with high frequency and high speed inter connects are becoming of increasing concern. Coaxial cables are a popular form of inter connect between intra- and intersystems and subsystems. Transfer impedance is a measure for assessing the shielding effectiveness of outer shield of a coaxial cable. In this paper, we proposed an easy and inexpensive method for estimating the surface transfer impedance (STI) of a coaxial cable and thus qualifying the sample for EMC to use in various applications. DIY RF Current probe is designed & validated in the test frequency range for carrying out STI measurements. Typical test setups for validation of current probes and estimation of STI are developed. In this paper, a frequency-domain measurement method using DIY current probe is proposed. This method is inexpensive and can be set up very quickly without any complex cable sample preparation.

Keywords: common mode current, electromagnetic compatibility, electromagnetic interference, RF current probe, surface transfer impedance

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References


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DOI: https://doi.org/10.37628/ijmet.v2i1.284

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