Description
WR51, WR52, S292 waveguide bends have low loss and voltage standing wave ratio (VSWR) as low as 1.08:1 and are available in E-plane and H-plane configurations. These 90 degree waveguide bends are made with gold-plated, oxygen-free hard copper (OFHC) or painted copper alloy. The bends are also offered with either a UG-style flange per the military standard or a CPR-style flange.
https://www.satellitedish.com/miterted-bend.pdf