Abstract：The broadband grounded coplanar waveguide (GCPW) is the core component for calibrating oscilloscope broadband probes. To accurately measure the bandwidth of the oscilloscope probe, obtaining the transmission characteristics of the broadband GCPW becomes the key to achieving high-precision calibration. A GCPW time-domain twice measurement system is constructed based on femtosecond laser excitation picosecond electric pulse technology in the measuring principle of time-domain automatic network analyzer(TDANA). This involves taking two measurements in the system to solve the impulse response of the broadband GCPW(twice measurement method), thereby the frequency domain bandwidth can be obtained. The GCPW is designed with a post-wall structure (vias placed along the signal trace), and the processed sample is measured by the twice measurement method. In this way, the 3dB bandwidth of our sample reaches 54.2GHz, which greatly agrees with the simulation result. The calibrated broadband GCPW can be used as a standard device for calibrating broadband probes, and its measured results can be effectively traced to the national benchmark for pulse waveform parameters.
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2023, Vol. 44 
