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关键词： Microstrip lines  

摘要： This paper proposes a three-dimensional uniform ultra-high frequency (UHF) near-field radio frequency identification (RFID) reader antenna. The antenna achieves a uniform electric field in the x and y directions by placing a single branch microstrip line along the x-axis and y-axis directions, respectively. It reaches a uniform electric field in the z-direction by a centrosymmetric four-branch microstrip line. The proposed antenna achieves three-dimensional direction uniformity through a reconfigurable method. The impedance matching bandwidth range of S-11 <-10 dB for simulation and measurement includes 0.66 to 0.98 GHz, which can meet the near-field RFID operation frequency band demand. The isolation degrees between ports are less than -24.6 dB within the UHF RFID frequency band (0.86 to 0.96 GHz). In addition, the antenna also has the characteristic of low gain in the far field, and the maximum gain in the far field is less than -27 dBi when operating at different ports. The test results show that the proposed antenna three-dimensional uniform volume of dipole tags above the antenna is 99 mm x 99 mm x 20 mm, and the reading volume of the near-field tags is 40 mm x 40 mm x 5 mm. When the tags are placed on a book, there will be a slight variation in the reading range of the tags.

摘要： The project’s primary objective is to manage Electronic-Toll-Collection, an adaption of energetic seeks to reduce delays on toll roads by electronically collecting toll fees. This Toll Plaza Controlling system discusses an automated toll collecting system for toll gates that is based on RFID-enabled smart cards. Nowadays, traffic flows are increasing and toll booths on highways are clogged. This will result in a traffic congestion and a waste of time. As a result, our primary focus is on automating toll collection through the use of sophisticated Smart Card-based RFID technology. A new user may simply register and change their balance using the Graphical User Interface (GUI). Once the Smart Card is used at a Toll Plaza, the appropriate amount is taken from the card. For all intents and purposes, the project’s primary objective is to manage Electronic Toll Collection [ETC], an application of energetic seeks to minimize delays on toll roads by electronically collecting toll fees. The primary goal of implementing an RFID-based toll management system is to automate the toll collection process by reducing long queues at toll booths by leveraging the RFID labels installed on the vehicle. Despite this, it can assist in recognizing car robberies and can follow vehicles as they cross faster vehicles. This framework is employed by car owners, according to the chairman of the framework. Other broad areas of interest for drivers include saving money on gasoline and reducing carbon emissions by reducing or eliminating deceleration, delaying time, and boosting speed. This framework primarily assessed the novel work for toll collection at toll gates on roadways using uninvolved RFID technology. By incorporating this anticipate into continuous operation, we may avoid failures, maximize time usage, and keep a strategic distance from lengthy tendencies to the highways. By employing an RFID-based computerized toll collection framework, the vehicle may check for security in real time,

关键词： Radio frequency identification (RFID)  

摘要： Many RFID systems own the information of RFID tags in the database, so the reader knows how many tags will be identified and which tags’ IDs might appear. How the RFID anti-collision protocols take advantage of this knowledge is a challenge. Some previous anti-collision protocols, including Query Tree with Shortcutting and Couple Resolution (QTSC) and Bit-tracking Knowledge-based Query Tree (BKQT), solved this task with the knowledge. We propose one novel protocol, Distinguished-bit Tracking Knowledge-based Query Tree (DKQT), which integrates the knowledge with the bit-tracking technique. Utilizing the knowledge and knowing the collided-bit locations, DKQT adopts a distinguishable technique which can identify the tags that have a distinguished-bit, representing that only one tag has a unique "0" or "1" in a bit location of the tag ID. Innovatively, adopting a distinguishable technique, DKQT forms an n-ary tree where a node has some leaves that are the tags having distinguished-bits. Thus, DKQT using the distinguishable technique can recognize multiple appearing tags in a collision by traversing this n-ary tree. The simulation results show that DKQT can reduce the number of slots by 36.94% and 15.58%, and the identification time by 37.47% and 17.86%, compared to the previous knowledge-based protocols, QTSC and BKQT, respectively. © 2023, The Authors. All rights reserved.

关键词： Internet of Things   Human action recognition   phase   RFID   spatiotemporal graph convolutional neural network (STGCN)  

摘要： Traditional solutions for human action recognition usually rely on sensor or video methods. However, these methods have some limitations, such as inconvenient portability, light intensity influence, privacy protection, etc. In this article, an RFID-based nonwearable human action recognition scheme is proposed. In order to reduce the occlusion effect of the human body on the signal and increase the diversity of the reflected signal, a tags array is constructed. The data of phase and RSSI are fused as feature data to enhance the diversity of data. Furthermore, a combined processing method is proposed to eliminate thermal noise generated by the equipment and reduce the interference caused by the environment. Then, an action segmentation algorithm is designed to align the RF signals of human action. Finally, an efficient human action signal classification model is constructed using the spatiotemporal graph convolutional neural network (STGCN). Extensive experiments demonstrate that the overall accuracy rate of the system for human action recognition is 92.8%. Compared with the comparative mainstream recognition algorithms, STGCN shows better classification performance in terms of identification precision. In addition, multimodal RFID data fusion also improves the accuracy of identification.

关键词： Diodes  

摘要： This article proposes a multi-diode-based wide-input power range rectifier for harvesting ambient radio frequency (RF) energy from 915 MHz ultra-high frequency (UHF). L-match series and parallel topology have been designed to not only boost the received input power but also to produce a highly efficient network to hold a broad input power range. A quality factor based parasitic aware impedance transformation technique are introduced to minimize the rectifier circuit design complexity. This paper demonstrates theoretically and practically that a parallel network is more effective than a series network due to greater harmonic suppression results in an improvement of 3 to 8 percent efficiency throughout a power range of −26 dBm to 12 dBm at a desired frequency. The design utilizes Multi diode (SMS7630, HSMS2850, and HSMS2862) approach to achieve higher efficiency over a wide input power range. From the measurements, the proposed series L match achieves peak power conversion efficiency of 75% at 4 dBm with 35 dB of wide input power range from −23 dBm to 12 dBm with > 20% respectively whereas the proposed parallel L match achieves peak power conversion efficiency of 79% at 4 dBm with 38 dB of wide input power range from −26 dBm to 12 dBm with > 20% in an area of 1.8 X 2 cm2 respectively. © 2023, CC BY.

关键词： Blockchain   Smart Contract   Halal Food   RFID   QR Code  

摘要： Blockchain is a disseminated open record that is utilized to record the exchange across numerous Personal computers. Blockchain innovation can be applied in any space like banking, medical services, land, travel, food, and store networks. In food products, halal food is served throughout the world. Halal does not only belong to Muslim people it's for everyone globally. Halal means cleanliness of this food ***, ensure the food products are free from contamination of halal food with other food products. The smart contract was created in the halal food supply chain to ensure consumer trustworthily. Tracking and tracing the halal products in the supply chain from producer to consumer we implement some special tags (RFID/QR Code). These special tags track the food products from farm to consumer and vice versa tracing the halal food from consumer to producer to reduce the contamination of food items with halal food items.

关键词： Chipless RFID tag   flexible substrate   monopole antenna   triple mode resonator  

摘要： In this paper, novel chipless radio frequency identification (RFID) tags are designed by using asymmetrical triple mode resonators constructed by an open loop resonator with two open stubs in different lengths. Three transmission zeros (bits) can be obtained by coupling a proposed resonator to a straight feeding line that connects input/output ports. Five frequency codes can be achieved with respect to the existence of the open stubs and the open loop resonator. By coupling eight asymmetrical triple mode resonators to the feeding line, a multi-resonant circuit is developed on a flexible substrate of Rogers 5870. Totally 24 bit frequencies can be achieved and it is possible to identify 5(8) different items. For the chipless RFID tags, two monopole wideband antennas in vertical/horizontal polarizations are integrated instead of the input/output ports. Two tags have been fabricated and tested to demonstrate the identification of different codes under smoothed and curved positions successfully.

关键词： 电子标签   射频识别   湿度检测   吸湿性   激活灵敏度   中心频点  

摘要： 基于电子标签封装材料吸湿性对介电常数的影响和封装材料介电常数对电子标签超高频射频性能的影响,设计并制作了可测湿度的电网设备电子标签。在标签设计方面选取了具有较强吸湿性的尼龙材质作为封装材料和窄带宽的抗金属线型作为天线结构,在读写终端设计方面改进了获取电子标签激活灵敏度中心频点的功能。模拟应用湿度性能测试显示,可测湿度的电网设备电子标签测量的相对湿度与湿度计测量的相对湿度两者绝对差值平均是2.0%RH。该设计使电子标签带有传感器的功能,将标识和感知合二为一,基本满足相对湿度测量精度要求不高的应用需求。

关键词： Internet ofMedical Things(IoMT)   healthcare systems   sensors   preprocessing   RFID   remote monitoring devices   networks  

摘要： IoT usage in healthcare is one of the fastest growing domains all over the world which applies to every age *** of Medical Things(IoMT)bridges the gap between the medical and IoT field where medical devices communicate with each other through a wireless communication *** in IoMT makes human lives easy and *** paper provides a comprehensive detailed literature survey to investigate different IoMT-driven applications,methodologies,and techniques to ensure the sustainability of IoMT-driven *** limitations of existing IoMTframeworks are also analyzed concerning their applicability in real-time driven systems or *** addition to this,various issues(gaps),challenges,and needs in the context of such systems are *** purpose of this paper is to interpret a rigorous review concept related to IoMT and present significant contributions in the field across the research ***,this paper discusses the opportunities and prospects of IoMT and discusses various open research problems.

关键词： 铁氧体   RFID   压力传感器   无线无源   有限元分析  

摘要： 提出了一种基于RFID反向散射耦合原理的无线无源柔性压力传感器。该传感器以铁氧体薄膜作为反射层,柔性海绵作为中间层,RFID标签作为数据传输层。通过有限元方法对传感器的增益和杨氏模量进行仿真,并使用压力测试系统测量传感器的灵敏度,最后得到了同样的结论:在相同厚度下中间层为低密度海绵的传感器灵敏度更高。此外对传感器进行了一系列性能测试,得到传感器最大工作距离为10 cm,在温度测量范围(25℃~45℃)误差为0.91%,在湿度测量范围(43%RH~82%RH)误差为0.89%。该无线无源柔性压力传感器结构简单、生产成本低,增加了无线无源传感器在近场范围内的测量距离。在医用绷带压力检测、足底压力检测等智能医疗领域具有良好的应用前景。