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

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 {H}_{x} , {H}_{y} , and {E}_{z} . 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.