Internal-matching high-frequency large power transistor

The invention discloses an internal-matching high-frequency large power transistor. The internal-matching high-frequency large power transistor comprises a transistor (14), an input matching network, an output matching network and a stabilizing network. The internal-matching high-frequency large power transistor is characterized in that the stabilizing network consists of a resistor (3), a capacitor (6), a first inductor (7), and a second inductor (8) in series connection; and both ends of the stabilizing network are respectively connected with the gate (9) and the drain (10) of the transistor (14). The internal-matching high-frequency large power transistor provided by the invention has the advantage that the isolation degree between the input and output of the power tube can be improved by serially connecting the stabilizing network between the gate and the drain of the device, thereby improving the stability of the high-frequency large power transistor; the Q value of the input impedance of the high-frequency large power transistor is improved to provide convenience for the design of a broadband matching network; and the tube shell utilization rate is improved without increasing extra size of the package tube shell, thereby improving the degree of freedom for the design of the broadband input/output internal-matching network.