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太赫兹变频组件是实现太赫兹成像和通信应用的关键器件。本文中介绍了基于hammer-head滤波器紧凑结构,结合肖特结二极管的三维模型和电气模型,设计低变频损耗250GHz太赫兹谐波混频器的方法。在高倍光学显微镜的精准测量下,建立尺寸可以跟信号波长相比拟的二极管三维模型,准确模拟二极管的高频特性以提高电磁仿真精度。为了进一步降低太赫兹混频器的变频损耗,文中除了采用紧凑型的hammer-head滤波器结构外,同时通过波导探针直接实现与二极管阻抗的匹配,简化了混频器的结构降低谐波信号传输线损,从而降低太赫兹谐波混频器的变频损耗。最终仿真结果表明,250GHz谐波混频器在3d Bm的本振功率驱动下,在230~270GHz射频范围内,变频损耗(SSB)均小于6.8d B,最低变频小于6.2d B,中频带宽大于20GHz。
Terahertz frequency conversion components are key components for terahertz imaging and communications applications. In this paper, a method based on hammer-head filter compact structure, combined with the three-dimensional model of Schottky diode and the electrical model, is introduced to design a low-frequency loss 250GHz THz harmonic mixer. Under the precise measurement of high power optical microscope, a three-dimensional model of diode whose size can be compared with the signal wavelength is established, and the high-frequency characteristic of the diode is accurately simulated to improve the electromagnetic simulation precision. In order to further reduce the frequency conversion loss of the terahertz mixer, in addition to using a compact hammer-head filter structure, the impedance of the diode probe is directly matched with the waveguide probe to simplify the structure of the mixer and reduce the harmonic signal Transmission line loss, thereby reducing the terahertz harmonic mixer frequency conversion loss. The simulation results show that the 250Hz harmonic mixer driven by the local oscillator power of 3dBm has the SSB of less than 6.8d B and the minimum frequency of less than 6.2dB in the 230 ~ 270GHz RF range. The IF bandwidth is greater than 20GHz.