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A category of microstructure is proposed, which consists of a seamless metallic film sandwiched in multi-layer dielectric films of Si and SiO₂. Such a structure can support unimaginable high broadband electromagnetic transmission from visible to near infrared. The transfer matrix theory is used to perform the numerical experiment and analyze the transmission characteristics. It has been revealed that Fabry-Pérot and bulk plasmon resonant modes excited in the composite structure contribute to the high broadband transmission that is weakly dependent on the geometry parameters and the polarization and incident angle of the light. When using a 15-nm Ag film, the calculated structure's sheet resistance is ~2 Ω/sq, which is superior to that of indium tin oxide glasses, thus making promising applications in optoelectronic devices, especially in photovoltaics.