The paper reports the bandwidth enhancement of a microstrip slot antenna for on‐metal RFID applications. Microstrip patch with a single conductive layer as wideband and conformal antenna is investigated. The proposed bandwidth enhancement is based on stepped‐impedance slot resonator integrated with an inset‐fed microstrip patch. Slots of different electrical lengths and impedances are configured to generate their respective and distinct resonances, and are subsequently overlapped to create wideband. Equivalent circuit modeling to characterize the antenna in terms of electrical lengths and impedances with respect to their resonances are investigated and reported. These resonances are optimized to overlap using certain numerical equations and the commercially available 2D/3D EM solvers. The resulting antenna is thereafter stamped on the external coating of the pipeline of an RFID specific application for signal monitoring and pipeline integrity.

中文翻译：

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步进阻抗缝隙微带馈线贴片天线，用于金属上射频识别应用

该论文报告了用于金属RFID应用的微带缝隙天线的带宽增强。研究了具有单个导电层作为宽带和共形天线的微带贴片。提议的带宽增强基于与嵌入式馈电微带贴片集成的步进阻抗缝隙谐振器。不同电长度和阻抗的槽被配置为产生它们各自的和不同的谐振，并且随后被重叠以创建宽带。研究和报道了根据电长度和相对于其谐振的阻抗来表征天线的等效电路建模。使用某些数值方程和市售2D / 3D EM求解器，可以优化这些共振以使其重叠。