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Reduction of measurement error in microwave reflectometers by minimum sensitivity calibration

Reduction of measurement error in microwave reflectometers by minimum sensitivity calibration

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Explicit formulas for the sensitivities of the error corrected reflection coefficient (RC) with respect to the RCs of the calibrating elements, and the invariance of their sum are presented. Under the condition that the sum of the sensitivities is constant, the sum of the absolute values of the sensitivities achieves a global minimum if the measured RC coincides with the altitude centre of the triangle formed by the RCs of the calibrating elements, or with one of the RCs of the calibrating elements. In the examples, 8 dB error reduction was found.

References

    1. 1)
      • Ladvánszky, J., Hilt, A.: `Minimum sensitivity calibration for reflectometers', Proc. Int. Workshop on Integrated Nonlinear Microwave and Millimeterwave Circuits, 7–9 October 1992, Duisburg, p. 153–167.
    2. 2)
      • B. Bianco , A. Corana , S. Ridella , C. Simicich . Evaluation of errors in calibration procedures for measurements of reflection coefficient. IEEE Trans. , 4 , 354 - 358
    3. 3)
      • Géher, K.: `Sensitivities of linear networks', 1972, DSc Degree Thesis, Hungarian Academy of Sciences, Budapest, (in Hungarian).
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