Abstract
This paper presents the design of a 920 MHz Ultra High Frequency (UHF) band radio frequency identification (RFID) conductive fabric tag antenna. The DC (Direct Current) resistance and impedance of the conductive fabric are measured by a DC multimeter and by a network analyzer at a UHF frequency band. The conductivities of the fabrics are calculated with their measured DC resistance and impedance values, respectively. The conductivities of the fabric are inserted into the CST simulation program to simulate the fabric tag antenna designs, and the results of the tag designs with two conductivities are compared. Two fabric UHF RFID tag antennas with a T-Matching structure, one with the name-tag size of 80 × 40 mm, and another with 40 × 23 are simulated and measured the characteristics of tag antennas. The simulated and measured results are compared by reflection coefficient S11, radar cross-section and reading range. The reading range of the 80 × 40 mm fabric tag antenna is about 4 m and 0.5 m for the 40 × 23 size tag. These fabric tags can be easily applied to an entrance control system as they can be attached to other fabrics and clothes.
Highlights
The radio frequency identification (RFID) (Radio Frequency Identification) tags are generally attached to an object and used in a technology that transmits information of the object to a reader through a reader antenna [1]
This paper presents the design of a 920 MHz ultra-high frequency (UHF) band radio frequency identification (RFID) conductive fabric tag antenna for access control applications
The conductivities of the different shapes of fabrics are calculated using the resistance value by a multimeter, and the impedance values at 920 MHz by a network analyzer. These conductivity values are separately input into a simulation program to design the Ultra High Frequency (UHF) conductive fabric tag antennas (CFTA) tag antenna
Summary
The RFID (Radio Frequency Identification) tags are generally attached to an object and used in a technology that transmits information of the object to a reader through a reader antenna [1]. Applies RFID technology to the entrance system or transportation card They use the HF band RFID cards [1]. The use of UHF tags to access control systems instead of HF RFID tags makes it easy by allowing a sufficient recognition distance and multiple recognitions simultaneously. Papers [12,13] had published the fabric tag for entrance control, and conducted measurements by attaching the fabric tag to the clothes and testing reading range. This paper presents a design of a UHF band tag antenna using Silver Woven conductive fabric, which is easier to design and easier to manage than a tag using conductive thread.
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