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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2026-08-19
An Asymmetric Dual-Band Doherty Power Amplifier Based on Dual-π-Shaped Phase Compensation Lines
By
Mingming Gao,

    Dr. Mingming Gao

    School of Electronics and Information Engineering

    Liaoning Technical University

    China

    Homepage

Bo Li,

    Dr. Bo Li

    School of Electronics and Information Engineering

    Liaoning Technical University

    China

    Homepage

Hao Meng,

    Dr. Hao Meng

    School of Electronic and Information Engineering

    Liaoning Technical University

    China

    Homepage

Jiawei Wang

    Dr. Jiawei Wang

    School of Electronics and Information Engineering

    Liaoning Technical University

    China

    Homepage

Progress In Electromagnetics Research C, Vol. 172, 392-404, 2026
doi:10.2528/PIERC26063007 | Google Scholar

Abstract
This paper presents an asymmetric dual-band Doherty power amplifier employing a dual-π-shaped phase-compensation network. To realize effective load modulation at two operating frequencies, dual-band phase compensation lines are introduced at both the input and output of the peaking amplifier. Each compensation line is implemented with a dual-π-shaped dual-band structure, which provides the required phase shift and impedance transformation at the two target frequencies, thereby satisfying the phase relationship required for dual-band Doherty load modulation. Meanwhile, transistors with different power levels are used in the carrier and peaking amplifier branches to form an asymmetric Doherty configuration, improving power-combining capability and efficiency in the output power back-off region. Simulation and measurement results show that the designed power amplifier achieves an output power of 47 dBm, a gain higher than 10 dB, and drain efficiencies of 70% and 65% at 2.6 GHz and 3.5 GHz, respectively. At 9-dB output power back-off, the drain efficiencies reach 60% and 54% at the two frequencies, respectively. These results verify that the proposed dual-π-shaped phase compensation method can effectively realize dual-band load modulation in an asymmetric Doherty power amplifier. Compared with conventional dual-band Doherty configurations, the proposed architecture offers improved dual-band load modulation characteristics and is promising for future multiband wireless communication systems.
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Citation
Mingming Gao, Bo Li, Hao Meng, and Jiawei Wang, "An Asymmetric Dual-Band Doherty Power Amplifier Based on Dual-π-Shaped Phase Compensation Lines," Progress In Electromagnetics Research C, Vol. 172, 392-404, 2026.
doi:10.2528/PIERC26063007
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