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(순천향대학교) (웨이비스) (웨이비스) (순천향대학교) (순천향대학교) (순천향대학교) (순천향대학교) (순천향대학교)
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대한전기학회 전기학회논문지 전기학회논문지 제75권 제11호
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    초록·키워드

    This paper presents the design, fabrication, and measurement of a 50W-class GaN HEMT power amplifier for X-band radar and satellite communication systems. To overcome single-device output limitations and achieve high integration, a 12-way parallel combining structure based on an Integrated FET process was proposed. The amplifier features integrated 4-way and 12-way divider/combiner stages within the chip to minimize loss. Phase and amplitude imbalances were resolved, achieving <0.4 dB amplitude error and <1° phase error. Alumina and Taconic RF-35 substrates were used for the RF and bias circuits, respectively, to ensure stable DC supply and high isolation. Evaluated at 10 GHz with a 25 us pulse width and 10% duty cycle, the fabricated amplifier demonstrated 47.78 dBm (approx. 60 W) output power, 44.11% PAE, 16.72 dB small-signal gain, and 12.76 dB large-signal gain, satisfying all design goals. This topology is applicable to next-generation high-power RF systems.

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