New coplanar-waveguide folded λ/4 open stub structure

This paper proposes a novel folded skill and the simpler way than that of the old methods. The advantage of this new structure reveals a better skirt factor than that of the conventional folded λ/4 series open stub, and reduces the folded area of the conventional structure by 50% at least. We can also increase the repeats of the fold to make the skirt factor better than that of the single folded structure.