A precise, very high-density and miniaturized printed circuit board (PCB) structure comprising a substrate-like PCB configuration is provided (and stacked to further increase integration in a fixed area) for reducing the occupied area of, for example, a mobile phone's main printed circuit board. The PCB area reduction hereof being a critical design feature used to create internal space in the mobile device so as to at least allow implementing a substantially larger battery (i.e. the battery is comparably upsized because it is reconfigured from a traditional configuration to fit into at least some of the created space) or to add functions. A photolithography process or like process is used to define the circuit pattern on the PCB structure so as to at least enable finer lines and spaces thereof than that provided by traditional subtractive PCB manufacturing. This abstract is not intended to be a complete description of, or limit the scope of, the invention.