Center for Sensors and Devices, Fondazione Bruno Kessler, 38123 Trento, Italy.
Department of Information Engineering and Computer Science, University of Trento, 38123 Trento, Italy.
Sensors (Basel). 2023 Jan 27;23(3):1430. doi: 10.3390/s23031430.
Chipless radio-frequency identification (RFID) sensors are not yet widespread in practical applications because of their limited sensitivity and selectivity when compared to more mature sensing technologies. The search for a suitable material to perform the sensing function has often been focused on the most common materials used in electrochemical sensing approaches, but little work has been done to directly relate the performances of chipless or microwave sensors to the characteristics of the materials used to fabricate them. In this work we are simulating the impact of the substrate material on the performances of a chipless RFID sensor for humidity detection. The dielectric parameters of the substrate material turn out to be very important to maximize the sensor performances, in relation to the operative range of the sensor (based on the desired application) and to the effective dielectric properties of the sensitive material used, we verify the simulated results with measurements of real chipless humidity cells with Nafion 117 sensitive material. We show which types of substrate are preferable for low-humidity detection and which substrates' features are instead fundamental to operate in a wider humidity range.
无芯片射频识别 (RFID) 传感器在实际应用中尚未得到广泛应用，因为与更成熟的传感技术相比，它们的灵敏度和选择性有限。寻找合适的材料来执行传感功能的研究通常集中在电化学传感方法中最常用的材料上，但很少有工作直接将无芯片或微波传感器的性能与用于制造它们的材料的特性联系起来。在这项工作中，我们正在模拟基底材料对用于湿度检测的无芯片 RFID 传感器性能的影响。基底材料的介电参数对于最大限度地提高传感器性能非常重要，这与传感器的工作范围（基于预期的应用）和所用敏感材料的有效介电特性有关，我们使用具有 Nafion 117 敏感材料的真实无芯片湿度单元的测量结果验证了模拟结果。我们展示了哪些类型的基底更适合低湿度检测，以及哪些基底的特性对于在更宽的湿度范围内运行至关重要。
