A Parallel Multistepped-Impedance Transmission Line (PMSITL)-Based Microwave Measurement System for Characterizing Binary Aqueous Mixtures

IF 4.3 2区综合性期刊 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Sensors Journal Pub Date : 2025-01-13 DOI:10.1109/JSEN.2025.3526774

Wen-Jing Wu;Hao Xie;Wen-Sheng Zhao;Wensong Wang

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引用次数: 0

Abstract

A parallel multistepped-impedance transmission line (PMSITL)-based microwave measurement system for retrieving complex permittivity of binary aqueous mixtures is proposed in this article. The proposed measurement system is composed of a standard characteristic impedance transmission line with multistepped-impedance resonators connected in parallel, a reflective radio frequency (RF) oscillator based on pseudomorphic high electron mobility transistor (PHEMT) ATF34143, and a frequency demodulation circuit. The transmission coefficient phase of standard characteristic impedance transmission line with parallel multistepped-impedance resonators (PMSIRs) loaded is utilized to detect the permittivity of liquid samples, the optimal parameter values of PMSITL are calculated by analyzing the mathematical model of PMSIR-based transmission line, and the optimal parameter values of PMSITL imply the highest change rate of transmission coefficient phase with regard to permittivity. Next, the reflective RF oscillator is constituted by a PMSIR-based transmission line and PHEMT ATF34143 is designed by negative impedance theory, which adopts the oscillation frequency to measure the permittivity of liquid samples. To improve the system integration level, the frequency demodulation circuit is added to the RF oscillator, which can transform the change of oscillation frequency into the variation of direct current (dc) voltage. In measurement, the proposed microwave measurement system exhibits an average sensitivity of approximately 0.2287% and 1.01% for the two channels, which are increased by dozens of times compared to state-of-the-art microwave sensors.

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基于并联多阶阻抗传输线（PMSITL）的二元水混合物微波测量系统

提出了一种基于并联多阶阻抗传输线（PMSITL）的二元水混合介质复介电常数微波测量系统。该测量系统由并联多阶阻抗谐振器的标准特性阻抗传输线、基于伪晶高电子迁移率晶体管（PHEMT） ATF34143的反射射频振荡器和频率解调电路组成。利用加载并联多阶阻抗谐振器（PMSIRs）的标准特性阻抗传输线的传输系数相位来检测液体样品的介电常数，通过分析PMSIRs传输线的数学模型，计算出PMSIRs传输线的最佳参数值，PMSIRs传输线的最佳参数值意味着传输系数相位对介电常数的变化率最大。其次，利用pmir传输线构成反射式射频振荡器，利用负阻抗理论设计PHEMT ATF34143，利用振荡频率测量液体样品的介电常数。为了提高系统集成度，在射频振荡器中加入频率解调电路，将振荡频率的变化转化为直流电压的变化。在测量中，所提出的微波测量系统对两个通道的平均灵敏度约为0.2287%和1.01%，与目前最先进的微波传感器相比，提高了数十倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Sensors Journal 工程技术-工程：电子与电气

CiteScore

7.70

自引率

14.00%

发文量

2058

审稿时长

5.2 months

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