UWB Reflectarray Antenna for chipless RFID applications

Khaliel

2015 IEEE International Conference on RFID (RFID)

et al. 2015

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The main objective of this contribution is to introduce a novel technique for increasing the coding capacity of the Frequency Coded (FC) chipless RFID system. The proposed scheme encodes 4 bits per single resonator exploiting the notch bandwidth and its corresponding frequency position. Hence, 72-bits could be achieved from 2 to 5 GHz preserving the operating frequency bandwidth. Furthermore, a Smart Singular Value Decomposition (SSVD) technique is utilized to estimate the notch bandwidth and ensure low probability of error. Consequently, high encoding efficiency and accurate detection could be achieved with simplified reader design. Likewise, a novel 4 x 5 cm 2 tag is designed to fit the requirements of the devised coding technique. Different tag configurations are manufactured and validated with measurements using Software Defined Radio (SDR) platform. The introduced coding methodology is conclusively validated using Electromagnetic (EM) simulations and real world testbed measurements.

“…In this work windowing is done in frequency domain by multiplying the received signal Y (f ) by a shifting window function as illustrated in Eq. (1).…”

Section: ) Windowingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel notch modulation algorithm for enhancing the chipless RFID tags coding capacity

Khaliel

2015 IEEE International Conference on RFID (RFID)

et al. 2015

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“…(i) RA Readers: RA antenna is proposed to improve of the chipless RFID reader antenna system [1]. This RA antenna system plays a significant role in increasing the tag reading range and enables the tag detection in a real environment.…”

Section: Introductionmentioning

confidence: 99%

Long reading range for the frequency coded Chipless RFID system based on reflectarray antennas

Khaliel

Int. J. Microw. Wireless Technol.

et al. 2018

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This work proposes the utilization of a high gain and pencil beam reflectarray (RA) antenna at the reader of the frequency coded (FC) chipless radio-frequency identification (RFID) system to minimize the environmental reflections and increase the reading range. Moreover, the reader antenna should operate over ultra wideband (UWB) range of frequencies to accommodate multiple bits. However, the conventional antenna arrays cannot operate over UWB range of frequencies with high gain and pencil beam characteristics. Therefore, a novel UWB RA antenna dedicated to the chipless RFID reader is developed. The developed RA antenna operates over UWB range of frequencies from 4 to 6 GHz to fulfill the requirements of the FC chipless RFID system. Therefore, the antenna is successfully integrated with the FC chipless RFID tags, and a reading range of 1 m is achieved.

“…Moreover, some contributions depends on the time of arrival, which could be misleading in a multipath fading channel . A logical solution is spatial multiplexing by utilizing narrow steerable reader antenna; however, it might happen that several tags present near each other in the main lobe of the antenna.…”

Section: Introductionmentioning

confidence: 99%

Real‐world testbed for multi‐tag UWB chipless RFID system based on a novel collision avoidance MAC protocol

El–Hadidy

Trans. Emerging Tel. Tech.

et al. 2016

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Chipless radio frequency identification (RFID) tags are dummy, memoryless, with limited number of bits, very low backscattered power, and short reading range. Therefore, the existing RFID standards and protocols designed for the chipped RFID systems are not applicable for the chipless systems. Main objective of this contribution is to introduce a novel real‐world testbed for multi‐tag ultra‐wideband (UWB) chipless RFID system. In this testbed, a new Notch Position Modulation scheme is implemented as the first medium access control algorithm for handling the multi‐tag identification scenario of the frequency signature based chipless RFID tags. This intelligent Notch Position Modulation algorithm reduces the sensing and identification time and accordingly the overall system latency. The proposed protocol enables fetching the frequency signatures of the chipless RFID tags through the whole UWB range effectively. Moreover, an advanced signaling scheme is designed for the RFID reader in order to make the best use of the Federal Communications Commission UWB regulations for increasing the maximum transmitted power and the corresponding reading range. The signaling scheme, real‐time channel estimation, and clutter removal technique are implemented on the software defined radio platform in a heavily dense multipath indoor environment. Based on the medium access control protocol, the mitigation of the undesired environmental reflections as well as the interference between the chipless RFID tags is well demonstrated in the developed testbed.