Marki Microwave RF/microwave waveguide bends are built with high precision and then gold plated for high corrosion resistance. Marki offers 45 and 90 degree bends for E-plane and H-plaMarki Microwave RF/microwave waveguide twists are built with high precision and then gold plated for high corrosion resistance. Marki offers 45 and 90 degree twists. They have optimal insertion loss and return loss, making them ideal for 5G, radar, satcom, and test and measurement applications.ne bend options. They have optimal insertion loss and return loss, making them ideal for 5G, radar, satcom, and test and measurement applications.