This paper proposes a low-cost, compact, flexible passive chipless RFID tag that has been designed and analyzed. The tag is a bowtie-shaped resonator based structure with 36 slots; where each patch is loaded with 18 slots. The tag is set in a way that each slot in a patch corresponds to a metal gap in the other patch. Hence there is no mutual interference, and high data capacity of 36 bits is achieved in such compact size. Each slot corresponds to a resonance frequency in the RCS curve, and each resonance corresponds to a bit. The tag has been realized for Taconic TLX-0, PET, and Kapton ® HN (DuPont TM ) substrates with copper, aluminum, and silver nanoparticlebased ink (Cabot CCI-300) as conducting materials. The tag exhibits flexibility and well optimized while remaining in a compact size. The proposed tag yields 36 bits in a tag dimension of 24.5 25.5 mm 2 . These 36 bits can tag 2 36 number of objects/items. The ultimate high capacity, compact size, flexible passive chipless RFID tag can be arrayed in various industrial and IoT-based applications.
A compact 27-bit linearly polarized chipless radio frequency identification tag is presented in this research. The proposed tag is designed with an overall tag dimension of 23 3 23 mm 2 . The tag comprises of metallic (copper) rings-based structure loaded with slots. These slots correspond to a particular sequence of bits. The circular tag is analysed using 2 different substrates, that is, Rogers RT/duroid/5870 and flexible Rogers RT/duroid/5880. The radar cross-section response of frequency signatured tag is analysed for humidity and temperature sensor designs. Humidity sensing is achieved by deploying a DuPont Kapton HN heat resistant sheet on the shortest slot of the tag, that is, the sensing slot. Temperature sensing is attained using Rogers RT/ duroid/5870 and Stanyl polyamide as a combined substrate. Hence, the miniaturized, robust, and flexible tag can be deployed over irregular surfaces for sensing purposes. K E Y W O R D Schipless tag, electromagnetic, flexibility, humidity sensor, temperature sensor | I NT ROD UCTI ONInternet of things (IoT) also known as ambient intelligence is an emerging technology. It ensures connectivity of physical and virtual objects to the internet at an unprecedented rate, thus, transforming traditional objects into smart ones. 1,2 This technology is an integral part of internet future, and it will interconnect uniquely identified embedded items through ubiquitous communication of physical objects. 3,4 IoT uses wireless and pervasive computing technologies to make objects intelligent. 1,5 The idea of IoT can be implemented using radio frequency identification (RFID) technology. RFID is a promising technology which has revolutionized automatic identification and wireless sensing of tagged objects. 6 RF waves are exchanged between a tag and reader using wireless transmission. RFID is a fairly handy technology because it facilitates non-line of sight communication which improves the tag's efficiency and provides longer reading range. [7][8][9] At the item level tracking, RFID technology is replacing optical barcodes. 7 The fabrication of microchip circuits is really expensive, and this sets a certain limitation on the manufacturing of RFID tags. This problem can be solved by excluding the microchip from the tag design. RFID tag without silicon chip is famous as chipless RFID tag. [10][11][12] Chipless tags have Int J RF Microw Comput Aided Eng. 2018;28:e21151.
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