一种用于太赫兹谐波混频器的宽带变频损耗测量技术
A Broadband Conversion Loss Measurement Technique for Terahertz Harmonic Mixers
AI总结：
本文提出一种基于三混频器线性方程组求解的宽带变频损耗测量方法，利用LO频率偏移实现单边带测量，无需镜像抑制滤波器，并成功表征了2.2–3 THz的WM-86肖特基二极管×4谐波混频器。
摘要：
本文提出了一种实验表征技术，用于在宽频率范围内评估太赫兹谐波混频器的性能。在上变频和下变频两种配置下，测量了三个混频器的总信号传输损耗，并通过求解线性方程组确定变频损耗。所提出的方法使用具有频率偏移的LO信号来确保单边带测量，从而无需镜像抑制滤波器。三混频器方法通过毫米波混频器的测量得到验证，其结果与使用校准源和功率计的传统表征方法一致。鉴于这一成功的毫米波演示，我们对三个WM-86肖特基二极管×4谐波混频器在2.2至3 THz范围内进行了表征。该技术在开展宽带混频器表征方面具有显著优势，尤其是在缺乏可调谐宽带源的太赫兹频段。
英文摘要：
This letter presents an experimental characterization technique for assessing the performance of terahertz harmonic mixers across a wide frequency range. The total signal transfer loss of three mixers was measured in both up- and down-conversion configurations, and the conversion loss was determined through the solution of a linear system of equations. The proposed method uses LO signals with a frequency offset to ensure single sideband measurements, thereby eliminating the need for image-reject filters. The three-mixer method was verified by measurements of millimeter-wave mixers, which matched the traditional characterization method using a calibrated source and power meter. Given this successful millimeter-wave demonstration, we characterized three WM-86 Schottky diode x4-harmonic mixers from 2.2 to 3 THz. This technique presents a notable advantage for conducting broadband mixer characterizations, particularly in the terahertz frequency regime which lacks tunable, wide-band sources.
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