Method and arrangement for through-line mismatch RF testing

An arrangement for through-line mismatch RF testing comprising:

• an air-isolated coaxial line having an inner conductor surrounded by a coaxial shielding,
• at least one circular opening through said shielding;
• and
• a corresponding radially adjustable piston being provided in each said opening such that the piston is electrically connected to said shielding and such that a protrusion of the piston from an inside of said shielding towards said inner conductor is adjustable, wherein different amounts of protrusion of the piston towards the inner conductor create different levels of RF mismatch;
• wherein the arrangement is configured to:
• pre-calibrate a known protrusion of the piston toward the inner conductor with a known amount of RF mismatch;
• and
• based on the pre-calibrating step, adjust the piston to protrude toward the inner conductor by an amount calculated to create a desired level of RF mismatch.

A system for through-line mismatch RF testing comprising:

• a device under test;
• a test load;
• a test monitoring equipment;
• and
• wherein said device under test and said test load are interconnected by an arrangement comprising:
• an air-isolated coaxial line having an inner conductor surrounded by a coaxial shielding;
• at least one circular opening through said shielding;
• and
• a corresponding radially adjustable piston being provided in each said opening such that the piston is electrically connected to said shielding and such that a protrusion of the piston from an inside of said shielding towards said inner conductor is adjustable, wherein different amounts of protrusion of the piston towards the inner conductor create different levels of RF mismatch;
• wherein the arrangement is configured to:
• pre-calibrate a known protrusion of the piston toward the inner conductor with a known amount of RF mismatch;
• and
• based on the pre-calibrating step, adjust the piston to protrude toward the inner conductor by an amount calculated to create a desired level of RF mismatch.