Design of Coupling/Decoupling Networks for Differential Mode Disturbance Testing

In this paper, a set of 10 Ω-50 Ω impedance converting baluns and a coupling/decoupling network (CDN) for differential-mode conducted disturbance testing are designed. The transmission line transformer theory is used to improve the impedance-converting balun, which broadens the operating frequency of baluns and offers a tolerance for the CDN's calibration. With the use of baluns and a vector network analyzer, the two-port insertion loss of the CDN is calculated, and the experimental findings meet the needs of differential mode conducted disturbances and signaling immunity test equipment at AC power ports,