MDL is one of the largest independent producer of waveguide and subassemblies in the microwave industry.The company is headquartered in Needham, Mass. MDL's product lines include waveguide bends and twists, directional couplers and monopulse comparators, rotary joints, microwave filters, rotary switches and waveguide shutters, waveguide pressure windows and other components. Besides manufacturing thousands of standard microwave components, they work with customers on custom requirements.