Also, a single fixed FB with an attached permeable plate (with a porosity of 0.62) at the front part was tested for improving the dissipative characteristics of the plate. The geometric characteristics were the same as the impermeable plate case. Fifty holes were drilled onto the plate. Each hole had a radius of 4.3 cm, while they were equally spaced in two rows in the plate, resulting in a porosity of 0.62 (Fig. 5). The testedwave conditions were the same as in the single fixed FB case..