Zhu Jinfeng, Chen Cheng, Sun Xiao, Ding Guowen, Wang Shenyun
Research Center of Applied Electromagnetics, Nanjing University of Information Science and Technology, Nanjing 210044, China.
School of Biological Science and Food Engineering, Chuzhou University, Chuzhou 239099, China.
Sensors (Basel). 2024 Oct 2;24(19):6389. doi: 10.3390/s24196389.
In this paper, a complementary split-ring resonator (CSRR)-based patch antenna is proposed as a microwave sensor to measure the salt concentration of NaCl solution. The microwave sensor consists of an RF-4 substrate, where a small copper disc is attached on the top as the radiator, a larger copper disc integrated with two CSRRs is attached on the bottom side as the finite ground plane, and a coaxial feeding port is introduced at the ground plane center. During salt concentration sensing, only the top disc is immersed into NaCl solution. The results indicate that the proposed microwave sensor can measure salt concentrations ranging from 5‱ to 35‱ with a maximum sensitivity of 0.367 (kHz/(mg/L)). The proposed microwave sensor is low-cost, low-profile, electrically small, lightweight, and easy to fabricate, and it also can be applied to other solutions' concentration sensing.
本文提出了一种基于互补分裂环谐振器（CSRR）的贴片天线作为微波传感器，用于测量NaCl溶液的盐浓度。该微波传感器由一个RF-4基板组成，顶部附着一个小铜盘作为辐射器，底部附着一个集成有两个CSRR的较大铜盘作为有限接地平面，并在接地平面中心引入一个同轴馈电端口。在盐浓度传感过程中，仅将顶部圆盘浸入NaCl溶液中。结果表明，所提出的微波传感器能够测量5‱至35‱的盐浓度，最大灵敏度为0.367（kHz/(mg/L)）。所提出的微波传感器成本低、外形低、电尺寸小、重量轻且易于制造，还可应用于其他溶液的浓度传感。
