# skrf.calibration.calibration.UnknownThru¶

class skrf.calibration.calibration.UnknownThru(measured, ideals, *args, **kwargs)[source]

Two-Port Self-Calibration allowing the thru standard to be unknown.

This algorithm was originally developed in [1], and is based on the 8-term error model (EightTerm). It allows the thru to be unknown, other than it must be reciprocal. This is useful when when a well-known thru is not realizable.

References

 [1] Ferrero and U. Pisani, “Two-port network analyzer calibration using an unknown thru,” IEEE Microwave and Guided Wave Letters, vol. 2, no. 12, pp. 505-507, 1992.

Attributes

 T_matrices Intermediate matrices used for embedding and de-embedding. biased_error Estimate of biased error for overdetermined calibration with multiple connections of each standard caled_ntwk_sets Returns a NetworkSet for each caled_ntwk, grouped by their names caled_ntwks List of the corrected calibration standards coefs Dictionary or error coefficients in form of numpy arrays coefs_12term Dictionary of error coefficients for 12-term Model coefs_12term_ntwks Dictionary or error coefficients in form of Network objects coefs_3term Dictionary of error coefficients for One-port Error model coefs_3term_ntwks Dictionary of error coefficients in form of Network objects coefs_8term Dictionary of error coefficients for 8-term (Error-box) Model coefs_8term_ntwks Dictionary of error coefficients in form of Network objects coefs_ntwks Dictionary of error coefficients in form of Network objects error_ntwk The calculated error Network or Network[s] family frequency Frequency object of the calibration measured_unisolated measured_unterminated normalized_directivity the directivity normalized to the reflection tracking nstandards number of ideal/measurement pairs in calibration output_from_run Returns any output from the run(). residual_ntwk_sets Returns a NetworkSet for each residual_ntwk, grouped by their names residual_ntwks Dictionary of residual Networks total_error Estimate of total error for overdetermined calibration with multiple connections of each standard.This is the combined effects of both biased and un-biased errors unbiased_error Estimate of unbiased error for overdetermined calibration with multiple connections of each standard verify_12term verify_12term_ntwk

Methods

 __init__ Initializer apply_cal Apply correction to a Network apply_cal_to_all_in_dir Apply correction to all touchstone files in a given directory. apply_cal_to_list Apply correction to list of dict of Networks. apply_cal_to_network_set Apply correction to a NetworkSet. embed from_coefs Creates a calibration from its error coefficients from_coefs_ntwks Creates a calibration from its error coefficients plot_caled_ntwks Plots corrected calibration standards plot_errors Plots biased, unbiased and total error in dB scaled plot_residuals Plot residual networks. pop Remove and return tuple of (ideal, measured) at index. remove_and_cal Remove a cal standard and correct it, returning correct and ideal renormalize Renormalizes the calibration error boxes to a new reference impedance. run Runs the calibration algorithm. terminate Terminate a network with switch terms unterminate Unterminates switch terms from a raw measurement. update_coefs update currect dict of error coefficients write Write the Calibration to disk using write()