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In RF energy harvesting, due to the variation of the available RF power, the conventional Dickson rectifier could not achieve the optimal harvesting efficiency in a wide available power range. To tackle this issue, in this work, a reconfigurable rectifier with adjustable conversion ratio is proposed without affecting the matching with the antenna under different configurations. Based on this, a UHF...
Indoor localization is very critical for medical care applications, e.g., the patient localization or tracking inside the building of the hospital. Traditional Radio Frequency Identification (RFID) technologies are very popular in this area since their cost is very low. In such technologies, each tag acts as the transmitter and the Radio Signal Strength Indicator (RSSI) information is measured from...
Near-field radio frequency identification (RFID) tags have a number of unique features such as being wirelessly powered, having ultra low power communication capabilities, small size, and low cost. These qualities paired with the increasing availability of commodity near field communication (NFC) enabled smart phones presents a significant opportunity to enable a wide range of new applications and...
RFID applications have power constraints that limit RF tags to short range communications. This article presents the design procedures, validated by experimental results, to make a low-powered reflection amplifier that exploits the quantum mechanical tunneling effect to dramatically enhance the range of passive or semi-passive tags. A return gain of 34.4 dB with bias power of 45 μW at 5.45 GHz and...
In this paper, an addressable UHF EPCGlobal Class1 Gen2 sensor IC for wireless intraocular pressure (IOP) monitoring on contact lens sensor device is proposed. The proposed sensor IC consists of RFID Analog/RF Front End, capacitive sensor readout circuit, and digital processing unit. RFID Analog/RF Front End is used for power management and data transmission. Sensor Readout Circuit will convert the...
Wearable devices have huge market potential, but their usage has been limited because means to power such devices is still a challenge. Batteries, the most widespread solution, add size, weight and need periodic recharging which is a huge deterrent. In this work, we propose to eliminate batteries by leveraging Wi-Fi transmissions from nearby devices such as access points and smart phones to deliver...
Are we just going to sit here while the unintended consequences of bad design wreak havoc on our lives? A retrospective about RFID creep and GPS abuse is called for.
An autonomous RFID sensor platform is designed and implemented using off-the-shelf discrete components. It includes a dipole antenna to wirelessly transmit the stored data to a reader according to the EPCglobal Class-1 Gen2 standard. The rectifier operates with received power as low as −10dBm. The microcontroller dissipates below 500nW in sleep mode, allowing an optimal energy harvesting and storage...
An RF powered UHF-RFID passive sensors platform was realized using discrete components and printed antennas designed to resonate at 868 MHz, used both for energy harvesting and data transmission. The tests demonstrate the possibility for the system to operate autonomously within the reading range of a standard RFID reader, that acts both as the RF power source and the receiver of the data stored in...
I have the great honor and pleasure to invite you to the 2015 IEEE Radio Wireless Week (RWW). This will be the ninth RWW and our third time in San Diego.
I have the great honor and pleasure to invite you to the 2015 IEEE Radio Wireless Week (RWW). This will be the ninth RWW and our third time in San Diego
In this paper we describe the main phases of an ideation, hardware design, development, prototyping and testing of UHF RFID high memory capacity TAG supported with two external independent power sources. There were used current best practices to design and build a proof of concept with two energy sources: Solar and Wireless which made the TAG battery free and semi-active. Harvested energy should help...
Ambient backscatter is a new communication technology that utilizes ambient radio frequency signals to enable battery-free devices to communicate with each other. In this paper, we study the problem of signal detection and bit error rate (BER) performance for this new communication system where the differential encoding is adopted to eliminate the necessity of channel estimation. We formulate a new...
An analysis of Electromagnetic Interference (EMI) between a Radio Frequency Identification (RFID) device and an Implantable Cardiac Defibrillator (ICD) is presented in this paper. In particular, the analysis focuses on the effects of EMI produced by an RFID reader on ICD operation. Thus, a brief overview of both ICD and RFID devices is presented at first. Subsequently, several experimental tests are...
Radio Frequency Identification (RFID)-enabled smart shelves are becoming common place in pervasive retail. These devices provide real-time information about the item's stock and location, but few efforts have been made to reliably detect human interaction with the items. We present a novel approach on real-time human-object interaction detection based on RFID using supervised machine learning techniques...
Radio frequency identification (RFID) is untouched automatic identification technologies in which information can be transmitted by radio frequency. In this study, an RFID system which can determine the position and place of any desired vehicle is designed and developed. Microprocessor transmitter devices, on which the vehicle information is loaded, are placed on the vehicles. Receiver circuits are...
According to the present situation of the wireless communication technology in the mine underground, the article makes a compare and analysis of the present of widely use of IrDA, RFID, Bluetooth, UWB and ZigBee etc. Short distance wireless communication, and designs the mine underground personnel positioning system using RFID technology based on the research of transmission characteristics of radio...
In this paper, a method is developed to evaluate the reliability of active RFID tags immersed in water. This situation exists in particular when infants wearing anti-rapt tag take bath. This study discusses the effects on the electromagnetic radiation of an emitting tag plunged into a water volume and then proposes a statistical method to predict the radio coverage of the immersed tag. Finally it...
Automatic vehicle accident detection is a life-saving application that is vital in today's high speed motorways. In case of motorway accidents, notification to the proper authorities must be done efficiently and expediently. The main objective of this paper is to create a Real Time Traffic Accident Detection System (RTTADS) using Wireless Sensor Network (WSN) and Radio-Frequency Identification (RFID)...
For inspecting on the nonlinearity of RF channel, measurements with novel multi-tone excitations are developed based on a vector network analyzer (VNA) and a multi-tone generator. Many differences have been found in both statistical averages and variances of the transmission function. These differences between statistical averages reflect the nonlinearity of RF channel, and the differences between...
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