Abstract
AbstractA compact planar composite antenna with dual‐band performance and good unidirectional radiation is proposed for handheld radio frequency identification reader application. The novelty of the proposed antenna is that it adopts the combination of planar Moxon and quasi‐Yagi interleaved structures. The Moxon structure due to its compact size is designed to operate in the lower band, while the quasi‐Yagi structure with the shared area is designed for the higher band. The lower and higher frequency bands of the antenna can be designed independently. Detailed design ideas and experimental results are presented. Measured results show that the fabricated antenna has a moderate gain of better than 5 dB and a large front‐to‐back ratio of more than 15 dB in both ultrahigh frequency 902‐928 MHz and industrial scientific and medical 2.4‐2.4835 GHz bands with low cross‐polarization levels. The antenna has the advantages of simple structure, easy processing, and excellent performance in terms of impedance matching and radiation patterns. It can be easily adjusted for other wireless applications, where both end‐fire radiation and dual‐band operation are required.
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