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The crosstalk between two microstrip lines is studied when one of the lines (the source line) is excited by a gap voltage source. In particular, the current induced on the passive line (the victim line) due to electromagnetic coupling to the source line is studied as a function of line separation and frequency for different permittivities. Results are also presented for the case of the source line excited by a vertical electric dipole to explore the effect of different source excitations on the crosstalk current. The current is calculated using a semianalytical method, which allows for an examination of the constituent current components on the lines (the bound-mode and continuous-spectrum currents) so that the physical mechanisms of coupling can be explored. The calculation is performed in an efficient manner using a mixed-potential integral-equation formulation with complex images.