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A simplified calibration procedure using T-matrix concept is presented for two-port vector network analyzer (VNA) with three measurement channels. Compared with Short-Open-Load-Thru (SOLT) calibration method based on 10-term error model where 10 error terms must be solved and saved at each frequency, the proposed method need define fewer characteristic variables. Moreover, a length-unknown 50Ω line can be used instead of a random single-port standard, for example, substituting Load standard with 50Ω line in SOLT calibration procedure. Via the simplified calibration procedure, the scattering parameters of a two-port device under test (DUT) can be finally obtained. Experimental verification is carried out, and good agreement is observed.

A CALIBRATION PROCEDURE FOR TWO-PORT VNA WITH THREE MEASUREMENT CHANNELS BASED ON T-MATRIX