Abstract: A method of de-embedding a feed line is shown. The method includes measuring network parameters of a multilayered planar substrate and obtaining network parameters of a feed line using a short-open-calibration (SOC) according to an ABCD-matrix. An “a” block of the ABCD-matrix includes a first matrix multiplied by a transpose of a first short-circuit current. The first matrix is an inverse of a difference of an open-circuit current and a second short-circuit current. A “c” block of the ABCD-matrix includes the open-circuit current multiplied by the “a” block. The method includes de-embedding the network parameters of the feed line from the network parameters of the multilayered planar substrate to obtain microwave circuit network parameters and, responsive to the microwave circuit network parameters being within or not within a specified range, respectively approving or rejecting customer shipment of the microwave circuit.