RF signal detector circuit with reduced sensitivity to transmission line impedance mismatches

摘要

An RF signal detector circuit and a method for monitoring the level of Radio Frequequency signals flowing through a trasmission line are disclosed. The RF detector circuit comprises: a first RF coupling device (181) connected to a transmission line (12) for receiving RF samples; and a first RF detector (201) responsive to an output of the RF coupling device (181). It is characterized in that it also comprises a further RF coupling device (182); and a further RF detector (202) responsive to said further RF coupling device (182), both said RF coupling devices (181, 182) being connected to the transmission line and placed at a distance (IC) from each other that is an odd multiple of one-quarter of wavelength lambda .