A novel optical filter with the angular selective light transmission for using in a double glazed smart window is proposed. The angular selectivity is provided by the relative position of the grating layers on two surfaces of the window panes. The surface gratings are formed by absorptive, reflective or scattering strips alternating with directionally transmissive strips. A graphic-analytical method for calculating the angular characteristic of light transmittance, an algorithm to optimize the solar radiation filtering according to the orientation of the window to the cardinal and an algorithm to calculate the geometric parameters of the filter with pre-specified characteristic of the transmittance are presented. The angular selective filtering of the solar radiation preadapted to the known trajectory of the sun relative to the specified window is provided without using the Venetian blinds or other daylight-redirecting devices. (C) 2015 Elsevier Ltd. All rights reserved.