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By default, mode source calculates mode at central frequency of the specified frequency range and then injects this mode at all frequencies, which is very effective in single-frequency and narrowband simulations. However, in broadband simulations, mode-mismatch errors increase as frequency range expands. In this example, the multi-frequency field of the mode source will be demonstrated using a copper wire with a thin dielectric coating operating in the broadband terahertz range.