A vertical junction field effect transistor includes a trench formed in an epitaxial layer. The system includes mmW front-end assembly, back-end electronics, and data acquisition hardware and software was assembled. At least an interface of the coupling member with the plug outer housing is formed of a heat-weldable material which is thermally weldable with the plug outer housing. The systems and methods present the estimated effect to an operator for viewing, reading, or offloading. Heterogeneous pilots can be spread-spectrum signals in an OFDM-based wireless network. The inventive article is characterized in that recesses, especially channel-shaped recesses, are introduced in at least one contact zone of the two work pieces.