Separation of Reflections for VSWR Measurements

A method of determining VSWR is presented whereby the device under test is isolated from the measuring instrument, its output connectors and any necessary adapters. The isolation is accomplished with a length of transmission line and a simple mathematical reletionship is used to determine the VSWR of the D.U.T. independent of everything else. The paper defines the method, illustrates its accuracy, shows the correlation between different measuring systems, and presents rescits for a few difficult measurements made easily and accurately.