An on-chip tunable transmission line, methods of manufacture and design structures are provided. A foam molded article according to a mode of the present disclosure is characterized in that in a situation of being divided into two equal parts in the thickness direction T of the foam molded article, the average cell diameter \u03b11 in the thickness direction T on the inner surface side A of the foam molded article is 1. An anodic oxide film layer is provided on a surface layer side of the first component body. A memory allocation unit allocates adjacent partitions to different memory banks.