Patent ID: 6963241

Claim:
A transmitter for transmitting RF signals at at least two power levels in each of at least two frequency bands, the transmitter comprising: at least one power amplifier connected to a working load; a first electronic circuit connected, in parallel to the working load, to the at least one power amplifier at a line length from the at least one power amplifier; wherein the first electronic circuit comprises a reactive impedance and a switching device connected in series, the reactive impedance and the line length having been chosen so as to provide, when the switching device is closed, a load selected with regard to the efficiency of the at least one power amplifier when the transmitter transmits at one of the at least two power levels; and wherein, if the at least one power amplifier is more than one power amplifier, the line length at which the first electronic circuit is connected to the power amplifiers is different for each power amplifier.