| 摘要 |
A wideband power coupler and method for taping part of a RF signal from a combined RF and AC signal with relatively simple structure and relatively low number of needed parts. The power coupler may include a BALUN, the BALUN constructed of a central conductor, an outer conductor and a ferrite element. Combined downstream AC and RF signal may flow through the central conductor of the BALUN. A part of the RF signal is reflected on the outer conductor of the BALUN with 180 degrees phase shift with respect to the RF signal, to create a reversed signal. Another part of the RF signal is sampled by a high pass filter. An autotransformer sums the reversed signal with the RF signal to create an output RF signal for an output tap port. When an upstream combined RF and AC signal flows through the BALUN, the phase of the RF signal reflected on the outer conductor of the BALUN is aligned with the phase of the RF signal sampled by the high pass filer such that the autotransformer cancels the upstream RF signal at the output tap port and the power coupler provides isolation to the output port. |
