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A 220 GHz High-Efficiency Doubler Based on Function-Based Harmonic Impedance Optimization Method

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Abstract

In this paper, a new terahertz solid-state frequency doubler design method named function-based harmonic impedance optimization method (FHIOM) is reported to improve the simulation iteration speed and accuracy of terahertz solid-state circuit design. Obtaining the matching impedance of the diode part in the optimal operating condition and realizing this impedance through the input-output matching structure are the two main steps in the design of the terahertz doubler. In this design method, harmonic impedance optimization and function-based impedance optimization are applied to quickly obtain the best input and output embedded impedance of the broadband frequency doubler device, which reduces the blindness of tentative optimization. This method innovatively estimates the impedance of the matching structure through the formula, which strengthens the connection between impedance optimization and matching structure realization. Based on the function-based harmonic impedance optimization method, a 220 GHz doubler is designed, processed, and measured. Measured results show that the doubler exhibits a bandwidth from 212 GHz to 230 GHz, with a conversion efficiency of above 15.0% a mean output power of 9.12 mW when supplied with up to 32 mW of input power. A 16 mW peak output power with a 16.4% efficiency was measured at 228 GHz when the input power was 97.55 mW. The frequency doubler design method presented in this work has the advantages of high efficiency and accuracy, which makes it very attractive for practical broadband terahertz applications.

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Authors and Affiliations

  1. School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, China

    Xiaoyu Liu, Yong Zhang, Chengkai Wu, Yuehang Xu & Fei Xiao

  2. Department of Microwave IC, Institute of Microelectronics of Chinese Academy of Sciences, Beijing, China

    Xiaoyu Liu, Haoran Wang, Bo Wang, Jingtao Zhou & Zhi Jin

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  1. Xiaoyu Liu
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  2. Yong Zhang
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  3. Chengkai Wu
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Correspondence to Yong Zhang.

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Liu, X., Zhang, Y., Wu, C. et al. A 220 GHz High-Efficiency Doubler Based on Function-Based Harmonic Impedance Optimization Method. J Infrared Milli Terahz Waves 43, 225–243 (2022). https://doi.org/10.1007/s10762-022-00842-w

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