| 摘要 |
The invention consists of a diffractive device for fitting to a façade (31) of a building (30), or to any other reflective wall. The device comprises a plurality of conductive structural elements (11) arranged periodically and in a substantially parallel manner on the façade of said building, in such a way as to form a diffraction grating. Said conductive elements (11) are cylindrical elements of trapezoidal cross-section (12) whereof the height (h) and the width at the top (w) are determined on the basis of the frequency of the incident wave. In order to achieve this, various values of the width of the base (b) are considered, and the element (23), whereof the cross-section minimises the reflection of the incident wave in the specular direction, is determined for each of said values while considering various height (h) values. One of said elements (23) determined in this way is then selected on the basis of predefined mechanical criteria. |
