| RFID (Radio Frequency Identification) Radio Frequency Identification (RFID) is a technology that uses radio frequency to perform two-way non-contact data transmission between reader and transponder and complete data exchange. RFID technology is widely used in various fields of daily life such as access control / identification,transportation system / warehouse management, and so on. It can be applied in moving objects and can work in harsh environment. Material/ product tracking, positioning and so on. However, different countries use different radio communication standards for radio frequency identification. In order to improve the compatibility of radio frequency identification systems in various countries, it is necessary to extend the working bandwidth of the RFID system, while the RFID reader antenna plays a key role in extending the bandwidth. In order to realize the wideband design of the near-field reader antenna, this paper applies the Wilkinson power divider and the composite right-hand transmission line to extend the bandwidth and extend the bandwidth to the whole UHF RFID band 860MHz-960MHz. Wilkinson power divider uses a three-frequency, three center frequency points are 890MHz, 900MHz and 910MHz. At last, the broadband antenna near-field reader antenna is designed and tested, the return loss of the antenna is measured and contrasted, and the testing environment is built to test the tag reading ability. The result shows that this paper realizes The bandwidth extension of the antenna and the ability of the antenna to read the tag in the near field region.Engineering, one is based on RFID intelligent production workshop management system, for the production of the cable in the workshop to track and read information, the successful implementation of the near field reader antenna applications; the other is the maximum range of the tag reading system of the dark room to build, and in the darkroom to the maximum reading distance of different labels to test. |
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