Cavity resonance devices module - uses metal extrusion of rectangular U=shaped cross-section with portions interlocking with adjacent modules

摘要

A module for forming the side walls of a cavity resonance device comprises a metal extrusion shaped in cross-section to be of a rectangular U-shape. The walls forming the free ends of the U are provided adjacent each of their free edges with first shaped portions forming part of the extrusion and extending longitudinally therealong. At least one of the walls forming the U-shape module is provided adjacent each edge of the outer surface of said wall with second shaped portions forming part of said extrusion and extending longitudinally therealong. The first shaped portions and the second shaped portions are designed so that the two first shaped portions of one module may be slid longitudinally into to fit together.