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Abstract: A dual-band filtering push‒;pull power amplifier (PA) with a large frequency ratio is presented in this paper. The proposed filtering power dividing/combining network is based on a hybrid-mode filtering balun using microstrip line (MSL) and substrate integrated waveguide (SIW). The MSL filtering balun operates in the S-band, with a 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, the prototype is capable of attaining a frequency ratio as high as five times the original value. Due to the inherent differential characteristic of the hybrid-mode filtering balun with a large frequency ratio, the proposed push‒;pull PA not only realizes filtering functionality but also achieves 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 delivers excellent performance, with a peak output power of 36.8 dBm at low frequencies and 36 dBm at high frequencies. Moreover, 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.

一种基于混合模式带通响应巴伦的大频比双频滤波推挽式功率放大器

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