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Design of Dual-Band Class F-1 Power Amplifier Based on the Integration of Harmonic Control and Fundamental Matching.

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Title: Design of Dual-Band Class F-1 Power Amplifier Based on the Integration of Harmonic Control and Fundamental Matching.
Authors: Huang, Wen1 huangwen@cqupt.edu.cn, Zhao, Junhao2, Liu, Jiang1, Hao, Honggang1
Source: Progress in Electromagnetics Research C. 2026, Vol. 167, p223-229. 7p.
Subjects: Power amplifiers, Impedance matching
Abstract: This paper proposes a dual-band class F-1 high-efficiency power amplifier with an integrated structure for harmonic suppression and fundamental matching. The fundamental matching network employed a dual-frequency coupler with open branches. This structure is partially reused for third-harmonic control by leveraging two open branches and two branch lines. By adjusting the characteristic impedance of the quarter-wavelength transmission line, the third-harmonic impedance is adjusted to a short circuit at both fundamental frequencies at the drain of the power amplifier. The second-harmonic control network consists of a quarter-wavelength open stub and a drain bias line loaded with a double-spiral defected ground structure (DGS), which controls the second-harmonic impedance to an open circuit state at the drain, satisfying the class F-1 harmonic conditions. A dual-band high-efficiency class F-1 power amplifier operating at 2.6 GHz/3.4 GHz is designed and fabricated. The measured results show drain efficiencies of 73.5% and 74.3% at 2.6 GHz/3.4 GHz, with output power exceeding 40 dBm and gain above 10 dB. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This paper proposes a dual-band class F-1 high-efficiency power amplifier with an integrated structure for harmonic suppression and fundamental matching. The fundamental matching network employed a dual-frequency coupler with open branches. This structure is partially reused for third-harmonic control by leveraging two open branches and two branch lines. By adjusting the characteristic impedance of the quarter-wavelength transmission line, the third-harmonic impedance is adjusted to a short circuit at both fundamental frequencies at the drain of the power amplifier. The second-harmonic control network consists of a quarter-wavelength open stub and a drain bias line loaded with a double-spiral defected ground structure (DGS), which controls the second-harmonic impedance to an open circuit state at the drain, satisfying the class F-1 harmonic conditions. A dual-band high-efficiency class F-1 power amplifier operating at 2.6 GHz/3.4 GHz is designed and fabricated. The measured results show drain efficiencies of 73.5% and 74.3% at 2.6 GHz/3.4 GHz, with output power exceeding 40 dBm and gain above 10 dB. [ABSTRACT FROM AUTHOR]
ISSN:19378718
DOI:10.2528/PIERC26012009