Frequency multiplication circuit and frequency multiplier

The invention discloses a frequency multiplication circuit and a frequency multiplier. The frequency multiplication circuit includes an input circuit, an output circuit and a high electron mobility transistor; the frequency multiplier includes the frequency multiplication circuit, an input waveguide, an output waveguide, a circuit substrate and a main cavity; and the high electron mobility transistor is arranged on the circuit substrate through a flip-chip bonding technology. The frequency multiplication circuit can bear larger input power and output power; and the frequency multiplier is lowin signal transmission loss and high in frequency multiplication efficiency. 本发明公开了种倍频电路及其倍频器，倍频电路包括输入电路、输出电路和高电子迁移率晶体管；倍频器包括倍频电路、输入端波导、输出端波导、电路基板和主腔体；高电子迁移率晶体管通过倒装焊接工艺设置在电路基板上；本发明能承受更大输入功率和输出功率，并且本发明的倍频器信号传输损耗低，倍频效率高。