Lightweight soundproofing meta-panel for separate wide frequency bands

•A lightweight soundproofing meta-panel that suppresses noise in separate wide frequency bands.•A geometrical frame to isolate sound waves in separate bands based on a multi-scale concept.•High sound transmission loss over a wide frequency range by inducing negative effective material properties of the meta-panel.•Experimental evaluation of the insertion losses of the meta-panel aiming at practical application in electric cars.