Four-Port Asymmetric Calibration Method for Simultaneous Measuring Hx, Hy, and Ez

• Published in: IEEE sensors journal Vol. 24; no. 10; pp. 16226 - 16232
• Main Authors: Nie, Duan, Liu, Wenyuan, Shao, Weiheng, Wang, Lei, Wang, Rui-Qi, Xue, Shan
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.05.2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Asymmetry; Calibration; calibration method; Coplanar waveguides; Electric fields; Electromagnetics; four-port probe; Magnetic separation; near-field measurement; Network analysers; Probes; Sensors; Standing waves; Uncertainty; Voltage measurement
• ISSN: 1530-437X; 1558-1748
• DOI: 10.1109/JSEN.2024.3384399

A four-port composite probe with a pair of symmetric cross-orthogonal loops has been verified to measure electric and magnetic fields simultaneously. However, in the near-field measurement, the asymmetry in the transmission path is difficult to avoid and will cause deviations in measurement results. In order to eliminate the asymmetry effectively, a four-port asymmetric calibration method (ACM) is proposed for simultaneously measuring the magnetic and electric fields of <inline-formula> <tex-math notation="LaTeX">{H}_{x} </tex-math></inline-formula>, <inline-formula> <tex-math notation="LaTeX">{H}_{y} </tex-math></inline-formula>, and <inline-formula> <tex-math notation="LaTeX">{E}_{z} </tex-math></inline-formula>. The proposed ACM combines the existing rotate and nonrotate ACMs by using a symmetric calibrator. A four-port probing system is set up for verifying the proposed method, including a six-port vector network analyzer (VNA) separately connected to four ports of the probe and a grounded coplanar waveguide (GCPW) as a calibrator. The effectiveness of ACM is well verified by a standing wave induced by an open-terminated GCPW.