Tunable waveguide attenuator and measurement setup

A measurement setup comprising:

• a tunable waveguide attenuator;
• and
• a RF signal source coupled to an input port of the tunable waveguide attenuator;
• wherein the tunable waveguide attenuator comprises a base structure that comprises:
• an input port for coupling to a waveguide for receiving an RF signal;
• an output port for coupling to a waveguide for outputting the received RF signal;
• and
• a bottom wall, a first side wall, and a second side wall, wherein the first side wall and the second side wall are arranged on opposite sides of the bottom wall, and wherein the bottom wall, the first side wall, and the second side wall enclose a hollow waveguide channel on three sides;
• the tunable waveguide attenuator further comprising:
• a movable cover for the hollow waveguide channel that on a surface facing the bottom wall comprises a first section and a second section with different surface loss properties;
• wherein the movable cover is movable such that the area of the hollow waveguide channel is covered by the first section and the second section with a changing ratio with the movement of the movable cover.

A method for manufacturing a tunable waveguide attenuator, the method comprising:

• providing a base structure, and forming on the base structure:
• an input port for coupling to a waveguide for receiving an RF signal;
• an output port for coupling to a waveguide for outputting the received RF signal;
• and
• a bottom wall, a first side wall, and a second side wall, wherein the first side wall and the second side wall are arranged on opposite sides of the bottom wall, and wherein the bottom wall, the first side wall, and the second side wall enclose a hollow waveguide channel on three sides;
• providing a first section and a second section with different surface loss properties on a movable cover;
• and
• movably arranging the movable cover on the hollow waveguide channel such that the area of the hollow waveguide channel is covered by the first section and the second section with a changing ratio with the movement of the movable cover.