Co-design of two-way doherty power amplifier and filter for concurrent dual-band application.

ABSTRACT In this letter, an architecture is presented to solve problems of classical concurrent dual-band Doherty power amplifiers (DPAs) and its design procedure is given. It is a codesign of two single-band DPAs and four filters. Two of filters at the output port are used for impedance transformation, harmonic components suppressing and signal isolating, while the another two split concurrent dual-band signals at the input port. In this way, intermodulation components of the two bands can be effectively suppressed and each band can achieve a good performance as single-band one's. This design concept is demonstrated through implementing of a practical dual-band DPA operating at 1.8 and 2.5 GHz. Measurement results show that efficiencies are 65.0 and 56.3% at the 6 dB output power back-off for concurrent application. The intermodulation components and harmonic components are lower than −40 dB except second harmonic component at 1.8 GHz (−32 dB). © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:530-533, 2017 [ABSTRACT FROM AUTHOR]