Systems and methods for achieving high directivity coupling over a reasonable frequency bandwidth on a microstrip transmission line. The final current density is larger than the beginning current density, and the beginning current density is maintained at a level for a sufficient time to substantially prevent bubble formation during the electroplating. The planetary gear mechanism switches the transmission of the driving force to the swing mechanism into a transmission state and a cutoff state by the switching portion. A storage container mounted on the trailer includes bottom support skids at each end that seat in the cross channels and are secured in the channels by casters that are attached to the skids through mounting holes in the cross channels. The transport protocol layer passes the APSI message directly to the application layer, bypassing the middleware protocol layers.