MANUFACTURING METHOD FOR ANTENNA

PROBLEM TO BE SOLVED: To achieve beautiful finishing in appearance without allowing the sticking section of an antenna element 8 to appear outside, and further to achieve pressure welding to a hole edge 4a inside a through hole without creating any local weak sections by equally expanding the entire circumference of the inner wall of the antenna element 8. SOLUTION: Liquid is injected to the inside of a portion in the antenna element that is inserted and placed in a space surrounded by a boom inner periphery surface. Pressure in the liquid is increased. The periphery of the portion that is inserted and placed inside the space is expanded in a radial direction for setting to a diameter that is larger than the through hole to prevent the antenna element from being moved in an axis center direction. COPYRIGHT: (C)2004,JPO