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This paper presents a 2.4GHz hybrid integrated active circulator consisting of three power amplifiers and three PCB-based Wilkinson power dividers.The power amplifiers were designed and fabricated in a standard0.35-μm AlGaN/GaN HEMT technology,and combined with three traditional power dividers on FR4 using bonding wires.Due to the isolation of power dividers,the isolation between three ports is achieved; meanwhile,due to the unidirectional characteristics of the power amplifiers,the nonreciprocal transfer characteristic of the circulator is realized.The measured insertion gain of the proposed active circulator is about 2–2.7dB at the center frequency of 2.4GHz,the isolation between three ports is better than 20dB over 1.2–3.4GHz,and the output power of the designed active circulator achieves up to 20.1–21.2dBm at the center frequency.
This paper presents a 2.4GHz hybrid integrated active circulator consisting of three power amplifiers and three PCB-based Wilkinson power dividers. The power amplifiers were designed and fabricated in a standard 0.35-μm AlGaN / GaN HEMT technology, and combined with three traditional power dividers on FR4 using bonding wires.Due to the isolation of power dividers, the isolation between three ports is achieved; meanwhile, due to the unidirectional characteristics of the power amplifiers, the nonreciprocal transfer characteristic of the circulator is realized. the proposed active circulator is about 2-2.7dB at the center frequency of 2.4GHz, the isolation between three ports is better than 20dB over 1.2-3.4GHz, and the output power of the designed active circulator achieves up to 20.1-21.2dBm at the center frequency.