Journal
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
Volume 29, Issue 10, Pages -Publisher
WILEY
DOI: 10.1002/mmce.21890
Keywords
antenna array; beam steering; circular polarization; RFID; rotation technique; series-fed
Funding
- National Natural Science Foundation of China [61671315, 61601315, 61871280]
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A circularly polarized beam-steering antenna array with Butler matrix is designed in this letter for ultra-high frequency radio frequency identification applications. To achieve the identification of the fast-moving tag groups, a 3 x 4 Butler matrix is utilized to switch the radiation directions at -25 degrees, 0 degrees, and +25 degrees, respectively. Besides, series-fed patch antenna element is designed and the 1 x 4 antenna array is built with element rotation for a good polarization performance. Finally, the proposed antenna system is fabricated and the identification area and radiation performance are tested.
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