Platform Tolerant, High Encoding Capacity Dipole Array-Plate Chipless RFID Tags

Abstract

In this paper, we first carry out an in-depth review of the performance parameters of frequencydomain chipless RFID transponders in terms of their spatial density, spectral capacity, and comprehensive encoding capacity (bit/λ 2 /GHz) comprising both spatial and spectral performance, and platform tolerance. Secondly, we theoretically and numerically investigate the recently introduced and promising concept of the platform-tolerant chipless RFID transponder based on a detuned dipole array-plate that provides high encoding capacity. We propose, fabricate and measure a 20-bit transponder consisting of an array of 20 detuned dipoles closely coupled to a 60 × 60 mm 2 metallic plate. The radar cross section at the level of −15 dBsm exhibits reliably recognizable minima corresponding to individual dipole resonances. When compared to other published frequency-domain chipless RFID transponders, the encoding capacity reaches 47.4 bit/λ 2 /GHz, which constitutes one of the highest values, while achieving a concurrently high level of radar cross section (RCS) reflection response and platform tolerance performance. The measurements confirm very good performance parameters in the cases when the transponder is attached to various packaging materials, such as cardboard, plastic, wood, metal or a human body phantom. The essential benefits of the presented solution include a very good frequency and amplitude stability in the RCS response, which enables a reliable reading of encoded information (if zero bits are coded). The double layer metallization represents an inherent property of the proposed solution, which is a necessary trade-off for high encoding capacity and contemporary platform tolerance.INDEX TERMS Chipless radiofrequency identification, coding capacity, coupled modes theory, dipole scatterer, electromagnetic band-gap, high impedance surfaces, platform tolerant tag, quality factor, radar cross section.

Augmented Depolarizing Scatterer Based on Resonant Elements for Polarimetric Radar Calibration

“…The proposed calibration scatterer is composed of classical microstrip-based eight resonant dipoles of different frequencies of resonances to cover a wide band. These types of microstrip dipoles are modeled in [15]. The resonant signals backscattered from the proposed scatterer might not be directly incorporated in the radar calibration procedures.…”

Frequency-Spectra-Based High Coding Capacity Chipless RFID Using an UWB-IR Approach

“…RFID technology contains two major components: readers and tags [1,9,10]. Recently, the application of chipless tags has been extensively studied by the research community to develop high-performance RFID tags [3,[11][12][13][14][15][16][17][18][19]. Several topologies relating to those used based on resonators have been suggested for chipless tags.…”

“…Since the commercialization of chipless RFID requires a communication specification, it is important to consider the appropriate bandwidth for a frequency spectrum system. Therefore, the operating frequency spectra have been selected as 2-4 GHz [13,26,27], 2-5 GHz [14,29], 2-8 GHz [24,25], [3][4][5][6]34,38], [3][4][5][6][7][8]21,33], 5-8 GHz [16], 4-8 GHz [17], and 3.1-10.6 GHz [22,37]. The objective of this study was to enhance the performance of RFID tags in major design parameters such as reading range, tag and reader separation distance, bandwidth, bit encoding ability, and bit states/resonators.…”

Multiple element of miniaturized printed log-periodic second series koch dipole array antenna for wideband chipless RFID tag reader

“…Many variations small size, high capacity, and printable chipless RFID based frequency domain and time domain have been designed to fulfill the requirement of the chipless RFID system [6,7]. Most structure of chipless RFID structures has implemented microwave structure such as dipole arrays [8], trefoil resonator [9], microstrip resonator [10], radar cross-section (RCS) [11] and frequency-selective surface (FSS) [12] with various conductor layout, design and shape for coding identification. This innovative technology of chipless RFID with the integration of Internet of Thing (IoT) [13] including smart radio-frequency sensors [14], 5-G communication technologies [15] and cloud computing storage can offer an enormous potential to replace the conventional visual optical barcode and conventional RFID system [16].…”