This study presents a wireless electromagnetic sensing system based on the resonant properties of the star-fractal antenna. Thus, it has been used for measuring the complex electrical permittivity of sodium sulfite solutions, according to both transmission and reflection efficiencies of the incident electromagnetic wave. The proposed antenna has been designed and simulated using the HFSS-Software (Ansoft High-Frequency Structure Simulator). The optimum resonant dimensions of the designed star-fractal antenna are (24.5 × 23 × 1.64) mm with a dielectric substrate (ε = 2.2). The proposed antenna operates on a single band applications, at frequency 2.4 GHz. Based on this antenna, several parameters have been calculated, such as the return loss, input impedance, and radiation patterns. Therefore, in this study, the designed antenna was used to fabricate a sensor to measure the electrical properties of liquids that depend on its concentrations. Thus, the various high concentrations of Na₂SO₃ solution (1–5) mol/L, were sensitized. Which were compared with the theoretical results using a special mathematical model to calculate the electrical properties of each concentration. Consequently, the good qualitative agreement results were measured for the real and imaginary parts of the complex permittivity at 99% and 92%, respectively.

本研究提出了一种基于星形分形天线谐振特性的无线电磁传感系统。因此，它已被用于根据入射电磁波的透射和反射效率来测量亚硫酸钠溶液的复电容率。所提出的天线已使用 HFSS 软件（Ansoft 高频结构模拟器）进行设计和仿真。所设计的星形分形天线的最佳谐振尺寸为 (24.5 × 23 × 1.64) mm，具有电介质基板 ( ε = 2.2)。所提议的天线在频率为 2.4 GHz 的单频段应用上运行。基于这种天线，已经计算了几个参数，例如回波损耗、输入阻抗和辐射方向图。因此，在这项研究中，设计的天线用于制造传感器，以测量取决于其浓度的液体的电特性。因此，各种高浓度的 Na ₂ SO ₃溶液 (1-5) mol/L 被敏化。将其与理论结果进行比较，采用特殊的数学模型计算各浓度的电学特性。因此，分别在 99% 和 92% 的复介电常数实部和虚部测量了良好的定性一致性结果。