De-embedding calibration for an electromagnetic dual probe using GCPW

An ultrawideband de-embedding calibration method (DCM) for a dual probe is proposed in this paper. Different from the conventional calibration method (CCM), in which a microstrip calibrator and the dual probe form a three-port calibration network, the proposed calibration system is a four-port network. By using two different lengths of grounded coplanar waveguide (GCPW) calibrators, namely line-kit and through-kit, the de-embedded S-parameter model of the calibration network is obtained. Measured results show that the ripple of the DCM with GCPW reduced by 59% of the CCM with the microstrip calibrator, and the phase delay has been almost compensated. In addition, the proposed method reduces the attenuation by approximately 0.7 dB at 10 GHz and 1.15 dB at 20 GHz. The calibration results indicate that the working frequency of the DCM is up to 22 GHz.