CPC E21B 7/15 (2013.01) [H01P 3/123 (2013.01)] | 10 Claims |
1. An apparatus comprising:
an outer tube formed as a single body having an inner surface, an inner diameter, and a length greater than 1 meter; and
an inner tube having an inner surface, an outer surface including a dielectric material on the outer surface, an outer diameter, and a helical-shaped groove formed on the inner surface and extending along a length of the inner tube, wherein the helical-shaped groove is configured to propagate a millimeter electromagnetic wave in an HE11 mode and the inner tube is positioned within the outer tube and the outer diameter of the inner tube is less than the inner diameter of the outer tube.
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