| 摘要 |
<p>A radio frequency (RF) monitoring apparatus (102) comprises an RF forward input port (116) and corresponding reverse input port (118) receiving, in use, forward-propagating and reflected fields respectively, of a transmitter, within a predetermined bandwidth. A tunable filter (218) of the apparatus (102) has at least one tuning signal input and is configured to provide at an RF filter output a selected frequency sub-band from within the predetermined bandwidth provided at an RF filter input which is coupled to at least one of the forward and reverse input ports (116, 118). An RF detector (220) has an RF input port coupled to the RF filter output, and is configured to generate at a detector output an electronic signal corresponding with RF power received at the RF input port. An electronic processor (202) comprises a tuning signal output coupled to the tuning signal input of the tunable filter, and a power signal input coupled to the detector output. The processor is configured to selectively generate a tuning signal at the tuning signal output corresponding with one or more specified frequency sub-bands, to record RF power signals generated by the RF detector corresponding with RF signals received at the forward and reverse input ports within the specified frequency sub-bands, and to provide monitoring signals determined from the recorded RF power signals. Embodiments are thus able to provide monitoring of individual frequency channels in an RF signal band, by configuration of the electronic processor to operate the tunable filter to select desired channel sub-bands. Measurement of forward and/or reverse-propagating fields within the selected sub-bands may be performed and corresponding power levels recorded. 4-4 x0 Am) CY) 0 t- ( x</p> |
