Profile: Custom Microwave Inc. specializes in offering adjustable loads, tunable shorts, EH tuners, variable attenuators and variable phase shifters. We also provide filters, diplexers & triplexers, polarizers, antenna feeds, optical coatings and testing services. Our variable attenuator is used to adjust power, reduce reflection interaction and provide isolation for certain components where needed. These attenuators contain a section of waveguide with a narrow slot milled in the broad wall.