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An efficient method for analysis of multilayer coupled transmission lines excited by an external electromagnetic wave is presented. The structure is first decomposed into coupled transmission line sections and crosstalk regions; then a lumped circuit model for the crosstalk region is presented and forced terms associated with the incident wave are calculated using the primary-secondary field idea. Finally, using modal decoupling method, the unknown modal coefficients and subsequently voltages and currents are obtained. The validity of the method is verified by comparison between analytical and simulated results of the HFSS full-wave simulator.