JZUS - Journal of Zhejiang University SCIENCE

ENGINEERING Information Technology & Electronic Engineering

Accepted manuscript available online (unedited version)

A dual-band filtering push-pull power amplifier with a large frequency ratio employing a hybrid-mode bandpass response balun

Author(s): Ji-Yang CHU, Xiang WANG, Tian-Xiang CHEN, Jin-Dong ZHANG, Jun HU, Huangyan LI, Boyu SIMA, Wen WU
Affiliation(s): School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Corresponding email(s): Xiang WANG, wangxiang@njust.edu.cn
Key Words: Large frequency ratio, dual-band filtering balun, harmonic suppression, push-pull power amplifier

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Ji-Yang CHU, Xiang WANG, Tian-Xiang CHEN, Jin-Dong ZHANG, Jun HU, Huangyan LI, Boyu SIMA, Wen WU. A dual-band filtering push-pull power amplifier with a large frequency ratio employing a hybrid-mode bandpass response balun[J]. Journal of Zhejiang University Science ,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/ENG.ITEE.2025.0149

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author="Ji-Yang CHU, Xiang WANG, Tian-Xiang CHEN, Jin-Dong ZHANG, Jun HU, Huangyan LI, Boyu SIMA, Wen WU",
journal="Journal of Zhejiang University Science ",
year="in press",
publisher="Zhejiang University Press & Springer",
doi="https://doi.org/10.1631/ENG.ITEE.2025.0149"
}

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A1 - Jin-Dong ZHANG
A1 - Jun HU
A1 - Huangyan LI
A1 - Boyu SIMA
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Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: A dual-band filtering push-pull power amplifier (PA) with a large frequency ratio is presented in this paper. The developed filtering power dividing/combining network is based on microstrip line (MSL) and substrate integrated waveguide (SIW) hybrid-mode filtering balun. The MSL filtering balun works at S-band with an operational frequency range of 2.6-2.86?GHz. Meanwhile, the SIW filtering balun is designed for Ku-band operation, covering a frequency range of 13-13.65?GHz. Under these conditions, this prototype is capable of attaining a frequency ratio as high as five times the original value. Attributing to the inherent differential characteristic of the hybrid-mode filtering balun with a large frequency ratio, the proposed push-pull PA can not only realize the filtering functionality but also achieve second-harmonic suppression. To validate the designed concept, the proposed prototype has been designed, fabricated, and measured. Measurement results demonstrate that the proposed PA achieves a 7-dB small-signal gain while maintaining out-of-band spurious rejection during active testing. The developed dual-band filtering push-pull PA has achieved an excellent performance of a peak output power of 36.8 dBm at low frequencies and 36 dBm at high frequencies. Meanwhile, by employing dual-band filtering baluns, the PA inherently suppresses even-order harmonics while simultaneously providing filtering characteristics in both operational bands, which effectively suppresses near-band spurious signals.

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