Patent ID: 8803531
Filing Date: 2014-08-12
Classification: G01R

Abstract:
1. A method of facilitating through-line mismatch RF testing using an air-isolated coaxial line having an inner conductor surrounded by a coaxial shielding, the method comprising the steps of: providing at least one circular opening through said shielding; providing a corresponding radially adjustable piston 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; pre-calibrating a known protrusion of the piston toward the inner conductor with a known amount of RF mismatch; and based on the pre-calibrating step, adjusting the piston to protrude toward the inner conductor by an amount calculated to create a desired level of RF mismatch.