A trapezoid patch antenna, designed for ultra high frequency band radio frequency identification tag mountable on metallic surfaces, is presented in this article. The proposed antenna has a simple and low‐profile (0.8 mm thick) structure. The impedance matching can be easily achieved by adjusting the upper‐side width and the height of the trapezoid patch. The reading range of the proposed antenna is verified by calculation and measurement, which shows good agreement. Varying antenna size can provide applicable reading range to suit different applications. The results obtained show that the proposed antenna can work efficiently in free space and on metallic objects.
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Chen et al. (2010) studied this question.
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