WT4 Millimeter Waveguide System: Mechanical Design of Sheathed WaveguideMedium

1.1 Sheathed medium components The installed WT4 transmission medium is composed of four basic mechanical elements; the outer sheath, supports for the waveguide within the sheath, the waveguide couplings, and the cylindrical waveguide tubing (Fig. 1). The outer sheath is a steel pipe manufactured by conventional methods and coated with a layer of polyethylene extruded over a black mastic undercoating. In addition to filtering the effects of irregular earth forces on the installed medium, the sheath affords protection for the 1899 Fig. 1--Components of WT4 sheathed waveguide medium.