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Modified Calibration Coefficients of Two-Port CPW Standards with Superstrate Effects

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Abstract

Calibration standards are used for the calibration of a vector network analyzer to characterize the microwave components under test. For the direct characterization of coplanar waveguide components, two-port CPW open, short and line are proposed to complement the existing calibration techniques. The developed CPW standards are characterized in the frequency range of 10 MHz to 10 GHz. As these are planar structures, effects of small superstrates on the calibration coefficients of open and short are studied also. The CPW line has shown slight changes in impedance due to superstrates, whereas a few calibration coefficients of open and short standards showed dependence on superstrates. Similar observations are noted by improving the polynomial models of CPW open and short standards up to fifth and sixth order, respectively, which better matches for CPW standards. The reported results are helpful to estimate any change in the measurement uncertainty on using such calibration standards due to superstrates.

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Acknowledgements

This work has been supported by University of Delhi under R & D Scheme 2015-16 (RC/2015/9677 dated 15/10/2015). Mr. Pulkit Sharma has helped in developing these standards.

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Authors and Affiliations

  1. Department of Electronic Science, University of Delhi, South Campus, New Delhi, India

    Kamlesh Patel

  2. Department of Electronics, Maharaja Agrasen College, University of Delhi, Delhi, India

    Paramjeet Singh

  3. Time and Frequency and Electrical and Electronics Metrology, CSIR-National Physical Laboratory, New Delhi, India

    Sandhya M. Patel & V. N. Ojha

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  1. Kamlesh Patel
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  2. Paramjeet Singh
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  3. Sandhya M. Patel
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  4. V. N. Ojha
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Correspondence to Kamlesh Patel.

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Patel, K., Singh, P., Patel, S.M. et al. Modified Calibration Coefficients of Two-Port CPW Standards with Superstrate Effects. MAPAN 35, 87–96 (2020). https://doi.org/10.1007/s12647-019-00348-2

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