Patent Number: 8,720,040

Title: Method of manufacturing a hollow waveguide

Abstract: A method of manufacturing a hollow waveguide including a metal pipe and a hollow region formed inside of the metal pipe includes pressure-bonding metal pipes each of which includes a metal material different from each other to form a metal-clad pipe including an inside metal layer and an outside metal layer, and polishing a surface of the inside metal layer.

Inventors: Hongo; Akihito (Tsuchiura, JP), Koike; Tadashi (Minori-cho, JP)

Assignee: Hitachi Metals, Ltd.

International Classification: H01S 4/00 (20060101)

Expiration Date: 5/13/12018