Application of Time Reversal Techniques for Identifying Shielding Effectiveness in Complex Electronic Systems

This paper proposes a novel method for determining the passive resonances of large and complicated electronic systems in the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{G H z}$</tex> frequency range. In this context, Time Reversal (TR) and the Decomposition of the Time Reversal Operator (DORT) have previously been demonstrated as techniques to identify resonances in various dispersive media (RF and acoustic). Here, we present an application of these methods for non-invasively identifying passive resonances as an alternative to the traditional ones that usually involve invasive measurement probes. The proposed method uses the multistatic data matrix (MDM) in the frequency domain for the detection of resonances with high accuracy. These techniques can be utilized in the EMI/EMC community to derive better shielding topologies for complex electronics.