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Circular RFID Antenna for White Space TV Band

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Abstract

The proposed antenna design is intended to be used in the 470 MHz to 806 MHz frequency band, which is now available for commercial use following the transfer of television signal transmission from the TV to satellite band. The antenna is more compact than existing RFID antennas in India, with four concentric rings sliced from a circular patch, and patch is shorted to ground by shorting pin. The design was created using FR4, a commonly used and durable substrate. The antenna’s gain and directivity are 8.11 dBi and 9.9 dB, respectively. It can operate in two bands within the desired frequency range: 479–492 MHz and 643–653 MHz. These bands have individual bandwidths of 13 MHz and 10 MHz, respectively, which are higher than commercially available UHF RFID antennas. The return loss in these bands is − 29 dB and -14 dB, respectively. The impact of changes in the ground plane is also discussed, and the return loss and bandwidth have been increased to − 29 dB and to 13 MHz, respectively.

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Contributions

The novelty of designing RFID (Radio Frequency Identification) antenna in white space TV band is to utilize unused TV spectrum (also known as “white space”) for RFID communication. White space TV band is the portion of the TV spectrum that is not being used by any TV broadcast or wireless communication system in a given geographic area. This approach allows for longer range communication and better penetration of obstacles, making it suitable for different applications. Using the white space TV band for RFID communication avoids interference with existing wireless systems, which is a critical concern in densely populated areas. It also provides a cost-effective solution as the infrastructure for TV broadcasting is already in place, reducing the need for additional infrastructure for RFID communication.

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Correspondence to Richa Sharma.

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Sharma, R., Raghava, N.S. & De, A. Circular RFID Antenna for White Space TV Band. Wireless Pers Commun 139, 1103–1118 (2024). https://doi.org/10.1007/s11277-024-11657-4

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