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All existing x-ray dispersive devices including crystals, multilayers and diffraction gratings generate spectra in multiple orders.In this presentation we report how an sinusoidal-shaped aperture with binary transmittance values can be used to disperse x rays and with a superior diffraction pattern where, all higher-order diffractions can be effectively suppressed.Hence this sophisticated dispersive element generates pure soft x-ray spectra in the first diffraction order, free from interference from higher diffraction orders.