Three-Step Monoblock Waveguide Twist

Twists are widespread devices among waveguide systems and assemblies. Their usefulness lies into the chance to interconnect sections with different orientation angles. Twists are often integrated directly into dual polarization systems, multiplexers and antenna feeds. Performance, compactness and costs are usually in trade-off but all of them need to be privileged to deliver a successful waveguide-based system. The novel approach proposed in this manuscript deals with the manufacturing of a wideband gradual rotation by means of three sections which can however be carved from a metallic monoblock through very standard milling process. This achievement is based on geometrical observations and on CNC milling procedures. The proposed concept is then verified with a 90 degrees twist based on standard WR75 with promising performance in terms of matching and losses.