Abstract: A method of producing a radio frequency member to construct a radio frequency confinement device based on a waffle iron structure includes providing an intermediate work of a plate shape or a block shape, the intermediate work including a main surface which is shaped as a plane or a curved surface and a plurality of rods extending away from the main surface. An interval between a side surface of one of the plurality of rods and a side surface of another rod that is adjacent to the one rod monotonically increases in a direction away from the main surface. The method also includes forming an electrically-conductive plating layer on the main surface and at least the side surface of the plurality of rods by immersing at least a portion of the intermediate work in plating solution.

Abstract: A structure in which rods are arrayed is provided by using a raw material such as resin, and a plating layer is provided on its surface to confer electrical conductivity. In doing so, in order to prevent defects from occurring in the plating layer between rods, a gradually-pointed shape is adopted for the rods, such that a gap between rods enlarges toward the upper ends. This makes air voids between rods likely to be discharged with surface tension effects. A ridge to become a waveguide member may also be formed together with rod rows. By adopting a gradually-pointed shape for the rods, gaps between the ridge and the rods also are shaped so as to enlarge toward the rod upper ends, to promote discharging of air voids from between the ridge and the rods.