太赫兹倍频器是实现太赫兹源的重要途径之一。基于线性叠加技术，研制了0.38 THz单级无源四倍频单片。采用平面环形巴伦与正交混合网络级联的方式，设计了四路移相功分结构，通过零电长度合成，实现了单级四倍频，同时基波和其他无用谐波得到了很好的抑制。设计中先对无源结构进行三维电磁场仿真，然后与有源部分联合仿真优化，在370~410 GHz 频率范围内，变频损耗小于25 dB。

Terahertz frequency doubling technique is a primary way to obtain terahertz signal source with high performance. A 0.38 THz single stage passive Monolithic Microwave Integrated Circuit(MMIC) quadrupler chip is developed by using linear superposition technique. The four-way phase shift power divider is designed by the cascade of planar ring Balun and orthogonal hybrid network, which makes the suppression of fundamental and other useless harmonics. The first procedure in the design is the electromagnetism simulation of passive structure, then the passive structure is combined with the active structure and jointly simulated for optimization. The conversion gain is below -25 dB in the frequency of 370-410 GHz.