A microstructured passage module for aerosol generator is provided. The module includes a plate overlaid by a cover thus forming a compartment, an entrance for a liquid and an exit. The plate includes a plurality of walls parallel to each other over its entire width so as to define a plurality of passages threrebetween. Moreover, a plurality of pillars protruding from the plate are distributed in at least section of the passages. A column is disposed proximate to the exit and blocks a substantial part thereof, leaving longitudinal aisles for the liquid to flow towards the exit. The liquid flows through the compartment from the entrance to the exit such that an aerosol is produced. A distance between two adjacent pillars is D and the longitudinal aisle has a width W. The D and the W are specifically configured such that the aerosol has a predetermined MMAD.本發明揭露一個可應用於氣霧化器的微結構化通路模組，其包含：一個覆有上蓋而形成腔室的板體、一個可供液體流經的入口和出口。板體包含平行排列於整個寬度上的複數突起壁，複數突起壁間定義為複數通路。此外，從板體突出形成的複數微，其分佈於至少一部份的所述通路中。一個中央柱設置於靠近出口的區域且佔據了靠近出口的區域相當大一部分，使得液體僅可以通過縱向窄道流向出口。液體自入口流經腔室至出口而形成氣霧。D定義為兩個相鄰微柱間的距離，W為縱向窄道的寬度。D及W被特別設計，因此氣霧具有預定的質量中數氣動粒徑(MMAD)。
