| Summary: | The application of ultra high frequency radio frequency identification(UHF RFID) in soil sample management can greatly improve the management information level. However, both soil and the attachment mode of label antenna have an influence on the performance of UHF RFID tag antenna. In this paper, the electromagnetic simulation software Ansoft HFSS was used to simulate and analyze the performance of UHF RFID tag antennas, and the influence of tag attachment mode and soil content in sample bottles on the performance of tag antennas was explored by combining the antenna theory. The results show that the direction chart of the label antenna changes greatly when the label antenna is placed vertically. The relative position of soil and label affects the input impedance of the label antenna, changes the recognition distance of the label antenna, and causes the misalignment of the label antenna.
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