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A high-efficiency concurrent dual-mode dual-band power amplifier is presented. It simultaneously operates at class-F mode for one band and at inverse class-F mode for the other band. With this mode assignment method, the conflict in harmonic impedance control for concurrent dual-band applications is avoided. Experimental results show a high performance of more than 80% peaking power added efficiency with 40.6 and 41.8 dBm output power in the sampled bands of 0.8 and 1.25 GHz, respectively.