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This paper presents a fast procedure for the evaluation of electromagnetic coupling between antennas and Printed Circuit Board (PCB) traces on mobile devices. Starting from the geometrical description of the device, a single full-wave simulation is used to compute the electric fields at selected PCB locations. Then, the theory of field-excited transmission lines is used to compute the antenna-induced EMI coupling coefficients at the terminations of an arbitrarily routed PCB trace. The results are finally fed to a rational fitting algorithm for the generation of a broadband SPICE-compatible netlist. This netlist can be used in system-level circuit-based simulations for signal integrity assessments including antenna-induced EMI.

This paper proposes a technique for the fast evaluation of antenna-induced noise at the terminations of PCB traces on compact mobile phones platforms. The main approach is based on the classical theory of transmission lines with external field excitation. We show that a single full-wave electromagnetic simulation is needed to compute the coupling coefficients for an arbitrary location of the trace on the phone PCB. Therefore, the approach is ideally suited for the automated incorporation of EMI constraints within routing and placement algorithms and for parametric and what-if analyses.

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