In this paper, a dual-band power amplifier based on tri-band impedance matching circuit is proposed. This amplifier uses reverse thinking to combine the tri-band impedance matching network with the power amplifier to mismatch the intermediate frequency as the isolation band. And the intermediate frequency is 3.0 GHz. Besides, the design process of dual-band power amplifier is given, and an example is given. Through the actual test results of the amplifier, it can be seen that the additional power efficiency of the amplifier at the frequencies of 2.6GHz and 3.4GHz is about 60%, the output power is more than 40dBm, and the gain is above 10dB. In the test results, it can be seen that the stopband of the power amplifier is 2.95-3.05GHz, the minimum gain and the minimum drain efficiency output power of the stopband are −1dB and 2%, which has a good stopband suppression effect.

本文提出了一种基于三频阻抗匹配电路的双频功率放大器。该放大器采用逆向思维，将三频阻抗匹配网络与功率放大器相结合，将中频失配作为隔离带。中频为3.0GHz。此外，给出了双频功率放大器的设计过程，并给出了一个例子。通过放大器的实际测试结果可以看出，该放大器在2.6GHz和3.4GHz频率下的附加功率效率在60%左右，输出功率大于40dBm，增益在10dB以上。在测试结果中可以看出，功率放大器的阻带为2.95-3.05GHz，阻带的最小增益和最小漏极效率输出功率分别为-1dB和2%，