Wearable Sierpinski Dragon Fractal Patch Antenna for RFID Applications

Radio Frequency Identification (RFID) system is one of ID technologies that are widely used for tracking objects efficiently. A standard RFID system is consisted of Tag and Reader. The tag includes an antenna and a microchip with internal read/write memory. The tag antenna plays a significant role in the overall RFID system performance factors, such as the read range. Integrating RFID tags into cloth makes it possible to monitor people with more security. In this paper, a new wearable textile antenna is presented for RFID applications. The structure of the proposed antenna is based on the 3rd iterations Sierpinski dragon fractal curve. The main goal of using this type of fractal geometry is because it can provide suitable and attractive shape, which is well easily included in the clothes. In addition, the proposed antenna shape can be hidden in the cloth for security purposes. The designed antenna is printed using a substrate with er = 1.8 and thickness of 1.37 mm. Modeling and performance evaluation of the proposed antenna have been carried out using the commercial Finite Integration Technique (FIT) based EM simulator, CST Microwave Studio (CST MWS). Results show that the antenna presents dual-band resonant behaviour with acceptable radiation characteristics with peak gains of about 3.393 dBi and read range equal to 5.730 m.

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