IEEE journal of radio frequency identification最新文献

{"title":"Dual-Channel FMCW Harmonic Radar With Active Tags at 61/122 GHz for Phase-Based Gait Parameter Monitoring","authors":"Patrick Kwiatkowski;Steffen Hansen;Alexander Orth;Francisco Geu Flores;Falko Heitzer;Nils Pohl","doi":"10.1109/JRFID.2025.3597021","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3597021","url":null,"abstract":"Optimized rehabilitation after joint replacement surgery or other medical procedures affecting the musculoskeletal system requires practical movement analysis systems that enable the continuous and precise gait monitoring of patients in everyday life. To address this need, we present a system consisting of a frequency-modulated continuous-wave (FMCW) radar sensor and active frequency-doubling tags designed for accurate long-term monitoring. By using a harmonic measurement concept in which the tags double the frequency of the transceiver signal, a high signal-to-interference-and-noise ratio (SINR) is achieved, ensuring that the tags stand out clearly from the clutter produced by the leg. With our system, we particularly focus on a phase-based angle determination within the sagittal plane, enabled by two closely spaced receive antennas, allowing for more accurate and reliable gait monitoring compared to our previous system based on a bilateration method. By utilizing millimeter waves in the frequency range 56-63 GHz for transmission and 112-126 GHz for reception, we achieve a compact sensor size sufficient for the application. Based on measurements taken in a gait laboratory, we demonstrate that our system is capable of measuring the distance and angle between the sensor and tags during gait with an accuracy of up to 1.73 mm and 0.93°, respectively, using a stationary camera-based motion capture (MoCap) system as a reference.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"692-704"},"PeriodicalIF":3.4,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11121189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A 915 – MHz Differential Rectifier and ASK/OOK Demodulator SoC for RF Energy Harvesting in Battery-Less ESL and IoT Applications","authors":"Chien-Chin Huang;Hsin Chen","doi":"10.1109/JRFID.2025.3595432","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3595432","url":null,"abstract":"This article presents the design and implementation of a novel receiver system-on-chip (SoC) for an RF energy harvester, which integrates a differential rectifier and a differential ASK/OOK demodulator. The SoC is fabricated using a standard 180 nm CMOS process. Targeted for applications in electronic shelf labels (ESL) and the Internet of Things (IoT), the proposed design operates in the 915 MHz ISM band. An off-chip differential matching network passively enhances the weak RF input signal from the antenna. A limiter circuit is incorporated within the proposed self-compensated differential rectifier to convert the RF signal into dual DC output voltages. The sixstage rectifier enhances the transistor overdrive voltage through dynamic negative biasing a. Furthermore, a novel differential ASK/OOK demodulator provides high-sensitivity detection of RFID signals transmitted from the reader. Measurement results demonstrate a startup sensitivity of -28.48 dBm for a capacitive load at a 1 V DC output, outperforming previously reported designs. The peak end-to-end power conversion efficiency reaches 45.5% at an input power of -2.26 dBm, delivering a load current of <inline-formula> <tex-math>$106 mu$ </tex-math></inline-formula> A and an output voltage of 2.53 V.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"590-604"},"PeriodicalIF":3.4,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wireless Sensors Network Design for Aerospace Telemetry Data Collection","authors":"Francesco Silino;Marco Alberti;Marco Tatangeli;Federico Brega;Marta Albano;Enrico Cavallini;Pietro Savazzi","doi":"10.1109/JRFID.2025.3595615","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3595615","url":null,"abstract":"In the aerospace field, weight reduction is of paramount importance. The main objective of this work is the development of a novel wireless sensor network to acquire telemetry data in aerospace environments. Wireless sensing introduces many advantages with respect to the use of wired sensors, such as lower costs derived from reduced weight and flexibility in arranging sensors in locations even where wires cannot be placed. However, some drawbacks must be managed, such as batteries that need to satisfy a good trade-off between energy budget and size. Furthermore, wireless propagation effects need to be counteracted, especially when considering transmission in a challenging environment like that of a launcher. Different protocols for wireless personal area network (WPAN) are analyzed to find the most suitable for space applications, focusing on high throughput, low latency, and power consumption features. Among them, the IEEE 802.15.4 and 802.11ah standards have been taken into account, performing a comparative analysis using simulations and experimental tests based on evaluation boards (EVB). The analysis showed that IEEE 802.15.4 achieved latencies below 8 ms but was limited to an effective data rate of about 154 kbps and short coverage ranges, making it unsuitable for large-scale telemetry. Conversely, IEEE 802.11ah achieved a PHY data rate up to 6.5 Mbps with negligible packet jitter and a packet loss ratio below 1% even with channel occupancy up to 80%. Latency was below 15 ms for 99% of packets, and energy efficiency was enhanced using packet aggregation and optimized modulation and coding schemes (MCS). A custom hardware platform integrating the NRC7394 transceiver and a switchable power amplifier was developed, demonstrating improved robustness and a transmit power up to 30 dBm for extended range. These results confirm suitability of the IEEE 802.11ah-based architecture for space environments and demonstrate its capability to meet stringent aerospace telemetry requirements.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"605-618"},"PeriodicalIF":3.4,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A 0.037-mm², 65.8-nW Temperature and Capacitance Sensor With Analog Pulse-Width-Modulation Backscatter","authors":"Taotao Wu;Yuxiao Zhao;Xiaochuan Peng;Jing Feng;Hao Min","doi":"10.1109/JRFID.2025.3592242","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3592242","url":null,"abstract":"Battery-less RFID sensor tags in the Internet of Things (IoT) expect low-cost and power-efficiency multiparameter sensing solutions. Traditional sensor designs rely on time-multiplexed parameter selection to prevent output coupling, which introduces extra control logic and increases cost and design complexity. This paper presents a temperature and capacitance (T/C) sensor with analog pulse-width-modulated (PWM) backscatter. The sensor achieves self-decoupling T/C sensing through the proposed self-switching double sampling (SDS) interface, eliminating the demand for parameter selection. With double sampling, a temperature-sensitive current alternately charges a reference capacitor and a sensing capacitor, simultaneously translating T/C information into a PWM waveform. The low pulse width (LPW) and pulse width ratio (PWR) independently represent temperature and capacitance, enabling simultaneous and decoupled readout. Meanwhile, SDS reuses the PWM waveform as the double-sampling control signal without external control logic. The PWM signal is sent back by analog PWM backscatter without the need for digitization. The SDS sensor employs a compact, ultra-low-power dual-slope relaxation oscillator (RxO) with inherent self-switching topology for T/C-to-PWM conversion. Fabricated in 55-nm CMOS technology, the sensor occupies 0.037 mm2 and consumes 65.8 nW at 0.8 V. Measurement results show that the T/C sensor achieves a temperature inaccuracy of −1.22/+1.17°C (<inline-formula> <tex-math>$3{sigma }$ </tex-math></inline-formula>) in <inline-formula> <tex-math>$- 20sim 100^{circ }$ </tex-math></inline-formula>C and a capacitance inaccuracy of −197/192 fF (<inline-formula> <tex-math>$3{sigma }$ </tex-math></inline-formula>) in <inline-formula> <tex-math>$0sim 35$ </tex-math></inline-formula> pF.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"579-589"},"PeriodicalIF":3.4,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Memory-Less and Backscatter-Less Tunnel Diode Harmonic Signatures for RFID","authors":"Christopher Saetia;Kaitlyn M. Graves;Serhat Tadik;Gregory D. Durgin","doi":"10.1109/JRFID.2025.3589528","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3589528","url":null,"abstract":"Within the field of radio-frequency identification (RFID) research, tunnel diodes have traditionally been researched for extending backscatter read-ranges for ultra-high-frequency (UHF) RFID tags as reflection amplifiers due to their negative resistance. This same negative resistance can also be used to help construct oscillators. This paper further explores the use of tunnel diodes to make oscillators for harmonic RFID applications and the natural harmonics that arise when biasing these diodes within their negative differential resistance (NDR) regions and with no external injection-locking, interrogating signal from a transmitting source, such as an RFID reader. These harmonics are characterized for five tunnel diode boards, made with the same components, and with each board’s fundamental frequencies’ RF strength measuring at above –15 dBm at a biasing voltage of 200 mV when measured over-the-cable. The best DC-to-RF conversion efficiency achieved in this work was 30%. The occurrence of harmonics from the tunnel diodes creates unique harmonic signatures for each board and demonstrates possible harmonic RFID applications that involve RFID readers discovering and even identifying RFID tags with backscatter-less, hardware-intrinsic, and memory-less IDs generated by such tunnel diodes on these tags. Thus, these harmonic signatures provide alternative or complementary IDs to the traditional IDs stored in tags’ memory.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"554-566"},"PeriodicalIF":3.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144773272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Fully ISM-Band Chipless RFID Tag With Hybrid Encoding for Micro-Scale Asset Identification","authors":"Fei-Peng Lai;Yen-Sheng Chen","doi":"10.1109/JRFID.2025.3589954","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3589954","url":null,"abstract":"Micro-scale asset identification requires cost-effective, spectrum-compliant radio-frequency identification (RFID) solutions capable of distinguishing a small, fixed number of items. Chip-based RFID raises manufacturing costs by requiring integrated circuits, while chipless RFID removes that expense by eliminating the chip. Nevertheless, many existing chipless designs focus on high-bit capacity over practical deployment, relying on broadband spans (3–7 GHz or more) that conflict with regulatory restrictions and reduce the cost advantage. To address this limitation, this work proposes a chipless RFID tag that operates entirely within the unlicensed 2.40–2.48 GHz industrial, scientific, and medical (ISM) band. Even though this allocation offers only 80 MHz, the encoding mechanism still defines 24 resolvable states by using the frequency separation between two co-polarized resonances and the cross-polarized magnitude difference, both extracted from a dual-resonator structure composed of a fixed L-shaped preamble and a tunable fan-based data resonator. This architecture enables independent and systematic control over spectral and polarimetric features. Experimental validation across all tag variants confirms correct decoding, with frequency deviations confined within ±2 MHz and magnitude classification errors under ±1.5 dB. Demonstrating a low-cost, regulation-compliant tag, this study shifts chipless RFID from conceptual encoding to practical solutions for compact, low-density tracking.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"542-553"},"PeriodicalIF":3.4,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IoT-Enabled Energy-Efficient and Long-Range Solution for Remote Patient Monitoring Using Bluetooth Low Energy 5.x","authors":"Ridhima Verma;Sukriti Gautam;Navnoor Singh Bal;Suman Kumar;Nagham Saeed","doi":"10.1109/JRFID.2025.3588402","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3588402","url":null,"abstract":"The Internet of Things (IoT) has revolutionized Remote Patient Monitoring (RPM) by enabling real-time data transfer. Traditional systems suffer from high energy usage and limited range, making them less suitable for long-term monitoring. This paper presents a novel wearable sensor node leveraging latest Bluetooth Low Energy (BLE) 5.0 features, such as long-range communication and energy-efficient extended advertising. The system integrates an ultra-low-power ARM M33 MCU, a motion sensor for activity tracking, and cloud connectivity for remote monitoring. The Physical Layer (PHY) modes, which determine on-air data transfer, significantly impact communication reliability. Challenges like packet loss are common, especially at extended ranges. Typical solutions involve increasing transmit power or implementing retransmission strategies, each with energy implications. The proposed system pioneers the evaluation of BLE modes–LE 1M and LE Coded PHY–on energy consumption and data transfer reliability of a broadcaster for sensor data transmission in real-time clinical settings. Experimental results reveal that while the conventional LE 1M reduces data transfer time by 84.92%, it increases Packet Loss Rates (PLR). In contrast, the latest LE Coded PHY reduces packet loss to just 2% at ranges upto 300 m but decreases battery life by 42.58%, still allowing a projected 2.6-year lifespan. To address power consumption, we propose a Dynamic PHY Switching Algorithm (DPSA) that adapts PHY modes. Results are validated on an IoT platform, providing insights for selecting BLE PHY for energy-efficient e-healthcare beacons.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"527-541"},"PeriodicalIF":3.4,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144725191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Multi-Antenna RAIN RFID Sensing Architecture for Pharmaceutical Climatic Chambers","authors":"A. B. Barba;N. Panunzio;S. Amendola;G. Marrocco;C. Occhiuzzi","doi":"10.1109/JRFID.2025.3587760","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3587760","url":null,"abstract":"Ensuring precise, in-package monitoring of temperature and relative humidity is fundamental for evaluating drug degradation processes during pharmaceutical Accelerated Predictive Stability (APS) studies. To this purpose battery-less, wireless probe sensors based on Ultra-High Frequency (UHF) Radio Frequency Identification (RAIN RFID) are emerging as innovative solutions for seamless monitoring of the micro-environment inside pharmaceutical packaging. However, APS studies are carried out inside metallic stability chambers that, being reflective, pose significant challenges for RF signal, often leading to reading coverage gaps and inconsistent data. This paper introduces a systematic experimental methodology for designing and validating an optimized multi-antenna RAIN RFID reading architecture for equipping a stability chamber to achieve approximately 100% reading coverage regardless of sensors orientations and positions. By experimentally refining the antenna type, number, and placement, as well as the interrogation power, the proposed methodology reliably overcomes electromagnetic interference. The results underscore the feasibility of robust, high-fidelity data collection via RAIN RFID passive sensors in APS scenarios as finally verified through an extended test for long-term monitoring of temperature and humidity within sealed pharmaceutical containers.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"517-526"},"PeriodicalIF":3.4,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144725187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bistatic 5G-NR Ambient Backscatter Communication: Propagation Study and Experimental Validation in Anechoic Chambers","authors":"Mariem Lefki;Moni Sankar Saha;Sahbi Baccar;Moncef Kadi;Hanen Shall;Mohamed Ghorbel","doi":"10.1109/JRFID.2025.3587632","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3587632","url":null,"abstract":"Ambient Backscatter Communication (AmBC) has emerged as a promising low-power wireless communication technique, particularly for Internet of Things (IoT) applications. This paper presents an experimental study on a fifth-generation 5G New Radio (5G-NR) backscatter communication system operating at 3.5 GHz, focusing on bistatic configurations. Specific considerations are taken in the experimental setup to improve signal detection and minimize direct path interference (DPI). For this, a backscatter modulator prototype is developed and tested in controlled environments, including full anechoic (FA) and semi-anechoic (SA) chambers, to analyze its performance under various conditions. Moreover, a generic mathematical model is proposed to predict the power budget of the whole AmBC system. This model takes into account geometrical parameters of the backscatter device (BD), i.e., distance and angles referring to the transmitter (Tx) and the receiver (Rx). The measurement results indicate significant variations in received backscatter power based on environmental factors such as reflections and antenna orientation. Experimental results are in good agreement with the theoretical model, validating the system’s feasibility and highlight the crucial impact of the sensor tag reflections, antenna orientation, and ground absorption on backscattered signal strength. The developed demonstrator consistently reflects a stable signal across different transmit power levels. This study provides key insights into the feasibility of 5G-NR ambient backscatter for energy-efficient wireless communication.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"739-757"},"PeriodicalIF":3.4,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Toward Realistic SDR-Based Emulation of Ray-Traced Millimeter-Wave Indoor Channels for Next-Generation Wireless Systems","authors":"Md Shakir Hossain;Kyei Anim;Geoffrey Mainland;Kapil R. Dandekar","doi":"10.1109/JRFID.2025.3586561","DOIUrl":"https://doi.org/10.1109/JRFID.2025.3586561","url":null,"abstract":"The convergence of advancements in antenna technology with Machine Learning (ML) is envisioned to enhance coverage and capacity for wireless communication systems in complex and dynamic millimeter-wave (mmWave) indoor environments. These environments often experience significant performance variability due to user movement and obstacles. Our study highlights the potential benefits of combining reconfigurable antenna (RA) systems with ML to address mmWave propagation challenges in indoor environments. However, rigorous verification and validation are essential to ensure accurate modeling of mmWave propagation, which is inherently complex and challenging to evaluate experimentally. To circumvent costly, time-intensive, and non-repeatable real-world measurements, we introduce a hardware emulation framework. It enables realistic evaluation of non-stationary, ray-traced channel models with a large number of propagation paths. This framework integrates realistic channel coefficients from site-specific 3D ray-tracing scenarios with RA-equipped access points (APs) and user mobility features. It incorporates them into a software-defined radio (SDR)-based full-mesh wireless channel emulation system, enabling the coexistence of virtual and real nodes. We present experimental results from transceiver hardware-in-the-loop testing in this testbed. These results feature repeatable and controllable path loss and delays between communicating nodes. Experimental evaluations confirmed that intelligent state selection algorithms, particularly Thompson Sampling and UCB1-Tuned, significantly enhance system performance in terms of throughput and packet error rate, outperforming traditional omni-directional antenna configurations.","PeriodicalId":73291,"journal":{"name":"IEEE journal of radio frequency identification","volume":"9 ","pages":"490-506"},"PeriodicalIF":2.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}