太赫兹分谐波混频器的变频损耗、噪声系数等指标与基波混频器相近,且本振频率为射频频率的一半,大大降低了本振源的设计难度和制作成本,是高性能太赫兹接收前端的关键部件。本文介绍了一种覆盖全波导带宽的太赫兹宽带分谐波混频器的设计,对电路中射频波导至悬置带线过渡结构和本振中频双工器进行仿真和优化设计。并以0.14~0.22THz分谐波混频器为例进行设计和制作,测试结果表明0.14~0.22THz分谐波混频器在全波导频段内最大变频损耗低于15d B,中频3d B带宽大于20GHz。 Terahertz sub-harmonic mixer frequency conversion loss, noise figure and other indicators similar to the fundamental mixer, and the local oscillator frequency is half the radio frequency, greatly reducing the design of the local oscillator source and the cost of production is high performance Terahertz receives the key components of the front end. This paper introduces the design of a terahertz broadband subharmonic mixer covering the full waveguide bandwidth and simulates and optimizes the design of the radio frequency waveguide to the suspended strip line transition structure and the local oscillator IF diplexer in the circuit. Taking 0.14 ~ 0.22 THz subharmonic mixer as an example, the test results show that the maximum frequency loss of 0.14 ~ 0.22 THz subharmonic mixer is less than 15d B in full waveguide band, and the 3dB bandwidth of middle frequency is larger than 20GHz.