The impact of coupler directivity between different RF power input methods

When power delivery system is used in EMC testing and E-field calibration to monitor the net power at the input of the load, the dual-directional coupler is commonly used. Typically, the power delivery system introduced in [1] and [2] with dual directional coupler is commonly adopted for its predicted uncertainty. In [5], another power delivery method can also be used by terminating the reverse power probe with a load. This paper focuses on the simulation model and experimental comparison between these three different radio-frequency power delivery systems using bi-directional coupler with low directivity.