Overmoded Waveguide Elbow and Fabrication Process

The invention provides a process for fabricating a sheathed-helix circular overmoded waveguide bend comprising an inner helical wound insulated wire, a dielectric lining, and an outer conductor layer surrounding the dielectric lining. The inner winding is wound on a removable hollow rigid core, the dielectric liner or sheath is then molded onto the outer surface of the winding, and the outer conductor is then attached to the outer surface of the dielectric liner. The core is made removable (from the helix winding) by coating it with a low melt temperature alloy which is melted by passing hot water through the hollow core.

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