Interpreting S-Parameter Spectra in Coupled Resonant Systems: The Role of Probing Configurations
arxiv(2024)
摘要
The S-parameter S_21 is widely used to characterize the resonant
properties of various systems. However, we demonstrates that the reliability of
S_21 as a true indicator of system resonances depends heavily on the
specific probing setup employed. While point-probe or weak probes preserve the
integrity of the S_21 spectrum and accurately reflect system resonances,
multi-point and strong probes can introduce significant discrepancies. These
discrepancies can manifest as misleading features such as repulsive level
anti-crossing or attractive level crossing, even in systems that are
fundamentally uncoupled. This highlights the critical importance of selecting
appropriate probing techniques to ensure a precise evaluation of system
resonances.
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