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Measurement procedures based upon Weissfloch's separation of a dissipative network into lossy and lossless portions are presented for the determination of the equivalent circuit parameters of dissipative four-terminal structures. The methods are developed around "distance invariant" equivalent networks which possess a number of desirable features in addition to permitting a simplification in the necessary calculations. They are particularly suited to such applications as the junction between surface wave or microstrip lines and their respective feed lines. Rapid and convenient semi-precision procedures are treated in some detail and sample calculations are presented.