A strip-shaped adhesive tape is joined to a ring frame, and then is stuck with a cutter blade having a flat plane obtained by forming a cutting edge into a wedge shape such that the cutter blade penetrates through the adhesive tape. Formation of such highly conductive sourcedrain extensions includes forming a passivated recess which is back filled by epitaxial deposition of doped material to form the sourcedrain junctions. A fenestration may be disposed in the sidewall and positioned distal of the second end opening of the branch. The grouping unit may be placed in one or more base stations or in any other suitable unit in the network.