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This paper describes the analysis, design, and testing of a six-port automatic network analyzer. A new calibration procedure is derived from a matrix description of the six-port network. The calibration constants appear as the soIution of an eigenvalue problem resulting in new insights and faster numerical computation. A programmable calculator-controlled six-port system was designed to measure S11 and S21 over the frequency range 2-18 GHz without perturbing the device under test. Measurements on the completed system taken from 7-12 GHz show that results within 1 percent can be obtained.