A Frequency Synthesizer Based Microwave Permittivity Sensor Using CMRC Structure
A Frequency Synthesizer Based Microwave Permittivity Sensor Using CMRC Structure
复制标题
基于频率合成器的CMRC结构微波介电常数传感器
DOI：
10.1109/access.2018.2808362
复制
发表时间：
2018-01-01
期刊：
影响因子：
3.9
通讯作者：
Wang, Gaofeng
中科院分区：
文献类型：
--
作者：
Chen, Shichang;Guo, Mengchu;Wang, Gaofeng
在本文中，提出了针对材料介电常数特征的高敏感微波介电传感器。通过紧凑的微带谐振电池（CMRC）设计反射电压控制的振荡器，并嵌入分数-N相锁的环路频率合成器中。 CMRC结构被测试的材料覆盖，改变了其共鸣特性，因此会改变初始振荡频率。由于频率合成器的存在，最终将这种频移转换为控制电压变化。在本文中，通过测量电压偏差来提取材料介电常数。测试了具有已知介电常数值的几个不同样本，以验证设计传感平台的有效性。
In this paper, a high-sensitive microwave dielectric sensor targeted for material permittivity characterization is proposed. A reflective voltage controlled oscillator is devised by virtue of the compact microstrip resonant cell (CMRC) and embedded into a fractional- $N$ phase-locked loop frequency synthesizer. The CMRC structure, covered with material under test, changes its resonating characteristics and, hence, the initial oscillating frequency. Due to the presence of the frequency synthesizer, this frequency shift is finally translated into the controlling voltage variation. In this paper, the material permittivity is extracted by measuring the voltage deviation. Several different samples with known permittivity values are tested to verify the effectiveness of the design sensing platform.