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To improve power efficiency in a transmitter, a novel method is proposed, this being an uneven multi-level linear amplifier with a nonlinear component (UMLINC). Compared to a normal multi-level LINC (MLINC), the UMLINC employs a new uneven multi-level signal component separator (UMSCS) that significantly improves transmitter efficiency.

A power combiner for nonlinear amplifiers based on the Wilkinson circuit method using lumped elements is presented. Compared to existing designs, the third harmonics of the two different signals, fed into the two input ports of the circuit, are matched and decoupled as well. The circuit is described and theoretical and measured results are presented.

It is described how linear amplification of signals is achieved by a coupled system of oscillators with a hybrid element, and an experimental verification is given. This scheme may be applied to amplification of signals ranging from microwave to optical frequencies.