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A metal sample folder was designed for dielectric measurement of liquids by combining a K (2.92 mm) connector and a brass cylinder with a small-diameter sample insertion hole for the cut-off circular waveguide reflection method. The jig was calibrated using SOL (short, open load) termination in the frequency range of 500 MHz to 16 GHz. In the calibration procedure of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S_{11}$</tex> at short termination condition for the jig, a metal circular rod is inserted into the sample folder. The diameter of the sample insertion hole is slightly larger than the inner diameter of the outer conductor of the K connector. Reliable electrical contact can be ensured with the flange surface of the K connector. <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S_{11}$</tex> values calculated by the mode-matching technique (MMT) for the analytical model were used as the theoretical values with calibration for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S_{11}$</tex> calibration under the open condition. The same K-connector load calibrator when calibrating the coaxial tip of the cable with the SOL termination before jig mounting was used for jig calibration under the load termination. The permittivity was then estimated from <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$S_{11}$</tex> when each liquid was inserted into the jig after SOL calibration by an absolute measurement as an inverse problem of the MMT for the analytical model. The differences between the above results and the estimated value as relative measurements by formulas involving comparison with the SOM (short, open and reference material) termination condition were then compared. The permittivity of each liquid was also considered in the frequency response.