Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control

Zeng Yan Chen; Zhi Zhan Zheng; Bai Hua Zeng; Yi-Ming Zhang; Shao Yong Zheng

doi:10.1109/ICMMT65948.2025.11188648

Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control

Zeng Yan Chen, Zhi Zhan Zheng, Bai Hua Zeng, Yi-Ming Zhang, Shao Yong Zheng^*

^*Corresponding author for this work

Department of Electrical Engineering

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

Abstract

This paper presents an efficient broadband sequential load modulated balanced amplifier (SLMBA) with extended output power back-off (OBO) range. The SLMBA utilizes a phase shifter for phase control, thereby achieving efficiency enhancement at different frequencies. The phase shifter is designed based on phase requirements of the carrier and peaking branches of SLMBA, featuring adjustable phase shift slope across the varying frequency. For validation, a broadband SLMBA operating from 2.7 GHz to 3.5GHz was designed, fabricated, and measured. According to the measurement results, the LMBA achieves 12-dB back-off range, with drain efficiency (DE) ranging from 35.3% to 43.1% at OBO and 58.6% to 74.2% at saturation, demonstrating the widest OBO range compared with previous works. © 2025 IEEE.

Original language	English
Title of host publication	2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Proceedings
Publisher	IEEE
Number of pages	3
ISBN (Electronic)	979-8-3315-2573-6
ISBN (Print)	979-8-3315-2574-3
DOIs	https://doi.org/10.1109/ICMMT65948.2025.11188648
Publication status	Published - 2025
Event	16th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Xi’an Qujiang International Convention Center, Xi'an, China Duration: 19 May 2025 → 22 May 2025

Publication series

Name	ICMMT - International Conference on Microwave and Millimeter Wave Technology
ISSN (Print)	2994-3132
ISSN (Electronic)	2994-3124

Conference

Conference	16th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025)
Place	China
City	Xi'an
Period	19/05/25 → 22/05/25

Funding

The work described in this paper was supported by the National Natural Science Foundation of China (No. 62471507).

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10.1109/ICMMT65948.2025.11188648

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Chen, Z. Y., Zheng, Z. Z., Zeng, B. H., Zhang, Y.-M., & Zheng, S. Y. (2025). Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control. In 2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Proceedings (ICMMT - International Conference on Microwave and Millimeter Wave Technology). IEEE. https://doi.org/10.1109/ICMMT65948.2025.11188648

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title = "Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control",

abstract = "This paper presents an efficient broadband sequential load modulated balanced amplifier (SLMBA) with extended output power back-off (OBO) range. The SLMBA utilizes a phase shifter for phase control, thereby achieving efficiency enhancement at different frequencies. The phase shifter is designed based on phase requirements of the carrier and peaking branches of SLMBA, featuring adjustable phase shift slope across the varying frequency. For validation, a broadband SLMBA operating from 2.7 GHz to 3.5GHz was designed, fabricated, and measured. According to the measurement results, the LMBA achieves 12-dB back-off range, with drain efficiency (DE) ranging from 35.3% to 43.1% at OBO and 58.6% to 74.2% at saturation, demonstrating the widest OBO range compared with previous works. {\textcopyright} 2025 IEEE.",

author = "Chen, {Zeng Yan} and Zheng, {Zhi Zhan} and Zeng, {Bai Hua} and Yi-Ming Zhang and Zheng, {Shao Yong}",

year = "2025",

doi = "10.1109/ICMMT65948.2025.11188648",

language = "English",

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publisher = "IEEE",

booktitle = "2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Proceedings",

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note = "16th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) ; Conference date: 19-05-2025 Through 22-05-2025",

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Chen, ZY, Zheng, ZZ, Zeng, BH, Zhang, Y-M & Zheng, SY 2025, Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control. in 2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Proceedings. ICMMT - International Conference on Microwave and Millimeter Wave Technology, IEEE, 16th International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025), Xi'an, China, 19/05/25. https://doi.org/10.1109/ICMMT65948.2025.11188648

Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control. / Chen, Zeng Yan; Zheng, Zhi Zhan; Zeng, Bai Hua et al.
2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Proceedings. IEEE, 2025. (ICMMT - International Conference on Microwave and Millimeter Wave Technology).

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control

AU - Chen, Zeng Yan

AU - Zheng, Zhi Zhan

AU - Zeng, Bai Hua

AU - Zhang, Yi-Ming

AU - Zheng, Shao Yong

PY - 2025

Y1 - 2025

N2 - This paper presents an efficient broadband sequential load modulated balanced amplifier (SLMBA) with extended output power back-off (OBO) range. The SLMBA utilizes a phase shifter for phase control, thereby achieving efficiency enhancement at different frequencies. The phase shifter is designed based on phase requirements of the carrier and peaking branches of SLMBA, featuring adjustable phase shift slope across the varying frequency. For validation, a broadband SLMBA operating from 2.7 GHz to 3.5GHz was designed, fabricated, and measured. According to the measurement results, the LMBA achieves 12-dB back-off range, with drain efficiency (DE) ranging from 35.3% to 43.1% at OBO and 58.6% to 74.2% at saturation, demonstrating the widest OBO range compared with previous works. © 2025 IEEE.

AB - This paper presents an efficient broadband sequential load modulated balanced amplifier (SLMBA) with extended output power back-off (OBO) range. The SLMBA utilizes a phase shifter for phase control, thereby achieving efficiency enhancement at different frequencies. The phase shifter is designed based on phase requirements of the carrier and peaking branches of SLMBA, featuring adjustable phase shift slope across the varying frequency. For validation, a broadband SLMBA operating from 2.7 GHz to 3.5GHz was designed, fabricated, and measured. According to the measurement results, the LMBA achieves 12-dB back-off range, with drain efficiency (DE) ranging from 35.3% to 43.1% at OBO and 58.6% to 74.2% at saturation, demonstrating the widest OBO range compared with previous works. © 2025 IEEE.

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DO - 10.1109/ICMMT65948.2025.11188648

M3 - RGC 32 - Refereed conference paper (with host publication)

SN - 979-8-3315-2574-3

T3 - ICMMT - International Conference on Microwave and Millimeter Wave Technology

BT - 2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Proceedings

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Chen ZY, Zheng ZZ, Zeng BH, Zhang YM, Zheng SY. Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control. In 2025 International Conference on Microwave and Millimeter Wave Technology (ICMMT 2025) - Proceedings. IEEE. 2025. (ICMMT - International Conference on Microwave and Millimeter Wave Technology). Epub 2025 Oct 14. doi: 10.1109/ICMMT65948.2025.11188648

Broadband Sequential LMBA with Enhanced Efficiency and Back-Off Range Based on Phase Control

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