A Design Approach of High-Efficiency Filtering Power Amplifiers Using Harmonic-Tuned Network and Terminated Coupled-line Structures.

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Bibliographic Details
Title:	A Design Approach of High-Efficiency Filtering Power Amplifiers Using Harmonic-Tuned Network and Terminated Coupled-line Structures.
Authors:	Ran, Lang¹, Wang, Bin¹ wangbin1@cqupt.edu.cn, Wang, Yongxin¹, Chen, Shihao¹
Source:	Progress in Electromagnetics Research C. 2026, Vol. 166, p1-8. 8p.
Subjects:	Power amplifiers, Bandpass filters, Frequency tuning, Electric networks, Miniature electronic equipment
Abstract:	A design approach using a harmonic-tuned network (HTN) and terminated coupled-line structures (TCLSs) for highefficiency filtering power amplifiers (FPA) is proposed in this paper, effectively addressing the efficiency degradation caused by the integration of filtering structures in conventional FPA designs. The proposed approach enables compact circuitry while providing bandpass filtering characteristics. Bandpass filtering is realized through the cascaded TCLSs, while the incorporation of open-circuit and short-circuit branches introduces additional transmission zeros and poles, significantly improving frequency selectivity. In addition, HTN enables precise control of the harmonic impedance, effectively improving the efficiency of the power amplifier (PA). Based on this approach, an FPA operating in the 2.3-2.6 GHz band is designed and implemented. Experimental results show that the FPA achieves a output power (Pout) of 40.8-41.3 dBm, a drain efficiency (DE) of 67.2-72.2%, a gain of 12.8-13.3 dB, and stopband suppression greater than 39 dB on both sides of the passband. These results verify the effectiveness of the proposed design in enhancing PA efficiency and enabling circuit miniaturization, while also providing a feasible design approach for FPA development. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	A design approach using a harmonic-tuned network (HTN) and terminated coupled-line structures (TCLSs) for highefficiency filtering power amplifiers (FPA) is proposed in this paper, effectively addressing the efficiency degradation caused by the integration of filtering structures in conventional FPA designs. The proposed approach enables compact circuitry while providing bandpass filtering characteristics. Bandpass filtering is realized through the cascaded TCLSs, while the incorporation of open-circuit and short-circuit branches introduces additional transmission zeros and poles, significantly improving frequency selectivity. In addition, HTN enables precise control of the harmonic impedance, effectively improving the efficiency of the power amplifier (PA). Based on this approach, an FPA operating in the 2.3-2.6 GHz band is designed and implemented. Experimental results show that the FPA achieves a output power (Pout) of 40.8-41.3 dBm, a drain efficiency (DE) of 67.2-72.2%, a gain of 12.8-13.3 dB, and stopband suppression greater than 39 dB on both sides of the passband. These results verify the effectiveness of the proposed design in enhancing PA efficiency and enabling circuit miniaturization, while also providing a feasible design approach for FPA development. [ABSTRACT FROM AUTHOR]
ISSN:	19378718
DOI:	10.2528/PIERC25122409