This paper reports a gas and humidity sensor design with improved sensitivity. The design is based on a planar antenna loaded with carbon nanotubes (CNTs). Sensing is achieved by the conductivity change of the CNT film when exposed to various gases or humidity levels. The sensitivity improvement was achieved by replacing a portion of the patch conductor at the dominant edge with a strip of CNT film, and accordingly having the CNT film exercise the maximum effect on the antenna's radiation. The fabricated sensor was tested in a sealed chamber by filling the chamber with several different gases and then with water vapor. The experimental results were excellent, and the gas sensing capability of the CNT‐loaded patch antenna was better than previously reported designs. The sensor was designed for 2.4 GHz so that it can easily be compatible with Wi‐Fi and Bluetooth devices, and the sensor geometry can be easily scaled to other frequencies, which shows great promise for applications of the proposed wireless sensor in environmental monitoring and weather forecasting.

中文翻译：

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装有碳纳米管的平面气体和湿度传感器

本文报告了一种灵敏度更高的气体和湿度传感器设计。该设计基于装有碳纳米管（CNT）的平面天线。当暴露于各种气体或湿度水平时，CNT膜的电导率变化可实现传感。通过用一条CNT膜条代替主边缘处的一部分贴片导体，并因此使CNT膜对天线辐射发挥最大作用，可以提高灵敏度。通过在密封室中填充几种不同的气体，然后填充水蒸气，在密封的室中测试了制成的传感器。实验结果非常好，并且CNT贴片天线的气体感应能力比以前报道的设计要好。传感器设计用于2。