Radio frequency identification (RFID) is a technology that uses communication via radio waves to exchange data between a reader and an electronic tag attached to an object, for the purpose of identification and tracking. RFID has gained more popularity because of its applications. The applications of RFID which includes human implants and parking control system are discussed in detail and also the overview of how RFID fits into the next generation is discussed. With more research, the flaws and limitations of this technology can be removed. This will make RFID technology very useful for diverse sectors like retail, transport and jewelry businesses. INTRODUCTIONRadio Frequency Identification (RFID) is a proven technology that has been used in commercial applications since at least the 1970s, but has only recently been introduced to the consumer goods supply chain. Until recently, the expense of RFID, as well as lack of international standards, has limited its use to applications such as security badges and toll passes. As the cost of RFID systems decrease and standards are developed, companies are increasingly looking to use RFID technology to increase supply chain efficiencies and reduce supply chain costs. An RFID is highly reliable way to electronically control, detect & track variety of items using FM transmission methods. It is a method of automatic object identification using radio waves. A typical RFID system consists of RFID tags, interrogators or readers, and computers. Radio Frequency Identification (RFID) is an emerging technology consisting of three key pieces: RFID tags (miniaturized chips); RFID readers; and a data collection, distribution, and management system that has the ability to identify or scan information with increased speed and accuracy. Compared to the bar code system, RFID promises long-term gains in supply chain management, transportation, defence and health care, to mention a few. RFID is increasingly used in commercial supply chain applications through pallet level tagging. There are a variety of groups defining standards and regulating the use of RFID, including the International Organization for Standardization (ISO), the International Electrotechnical Commission (IEC), ASTM International, the DASH7 Alliance and EPCglobal.
COMPONENTS OF RFIDThis system basically consists of following components.
Fig. 1 shows a model of basic RFID system. Active and passive RFID tags are the two types of RFID tags that are generally used. The active RFID tags transfer the information directly to the reader without the use of an external battery or source, whereas, the passive tags require external power for functioning. A. RFID Tag RFID systems. The software manages the interaction between the RFID reader and the RFID tags. Read-Only Tag: In the read only tag, the microchip or memory is written only once, during the manufacturing process. The information, along with the serial number on the read only tag, can never be changed. Fixed RFID and Mobile RFID: Depending on mobility, RFIDs are classified into two different types: fixed RFID and mobile RFID. If the reader reads tags in a stationary position, it is called fixed RFID. On the other hand, if either the reader or the tag is mobile when the reader reads tags, it is called mobile RFID. Last, the RFID is classified into mobile RFID for the case that both the reader and the tag are mobile. There are three types of RFID tags: passive RFID tags, which have no power source and require an external electromagnetic field to initiate a signal transmission, active RFID tags, which contain a battery and can transmit signals once an external source (‘Interrogator’) has been successfully identified, and battery assisted passive (BAP) RFID tags, which require an external source to wake up but have significant higher forward link capability providing greater range. B. RFID Reader RFID reader is the device used to transmit to and receive information from the RFID tag. It is also referred to as an ‘interrogator’. It includes sensors that read the RFID tags in the vicinity. C. Antennas The antenna emits radio signals to activate the tag and read and write data to it. Antennas are the conduits between the tag and the transceiver, which controls the system’s data acquisition and communication. Antennas are available in a variety of shapes and sizes; they can be built into a door frame to receive tag data from persons or things passing through the door, or mounted on an interstate toll booth to monitor traffic passing by on a freeway. The electromagnetic field produced by an antenna can be constantly present when multiple tags are expected continually. If constant interrogation is not required, the field can be activated by a sensor device. Data is transferred without a line of sight to the tag. Note, however, that unfavorable conditions can cause transmission problems with certain technologies, such as metallic environments or liquids. Tags and readers/writers must have compatible frequencies. High-frequency (850 MHz to 950 MHz and 2.4 GHz to 2.5 GHz) systems, offering long read ranges (greater than 90 feet) and high reading speeds. Supporting Infrastructure: The supporting infrastructure, includes related software and hardware required for RFID systems. The software manages the interaction between the RFID reader and the RFID tags. APPLICATIONS OF RFID TECHNOLOGY
RFID has many applications; for example, it is used in enterprise supply chain management to improve the efficiency of inventory tracking and management. Parking lot operators, whether public or private, face a number of challenges such as:
An intelligent parking control management system has launched that integrates RFID technology, automatic control technology and applications software. The RFID tag on the vehicle will be able to automate the in and out privileges of the subscriber and then transfer this data to the enterprise software for the above-mentioned benefits of traffic analysis that allow you to optimize the human resources needed for traffic flow in and out. For customer payment, the RFID tag can be read to debit a pre-pay system or charge the parking services against a credit card. All of this will facilitate customers entering and leaving and this improves service levels and increases capacity in the parking lot. These benefits will drive higher revenues. This intelligent parking lot system is composed of RFID tags (for the vehicles), readers stationed around entry and exit points, applications software and then networked using TCP/IP network communication protocol. The system is flexible to allow a human interference, if necessary, to be able to accommodate unusual events such as when the non-tagged vehicles enter.Few of the parking control system devices are shown in Fig. 6. The following picture shows the network enabled parking access control ADVANTAGES OF RFIDRFID technology has a number of advantages.
DISADVANTAGES OF RFIDThe RFID technology, though very beneficial, is expensive to install. Small and medium scale enterprises find it costly to use it in their firms and offices.
CONCLUSIONRFID, because it is a cross-cutting and enabling technology, adds to the important role ICT (Information and Communications Technology) plays to promote innovation, economic growth, and global commerce. Looking toward the future, as the information infrastructures associated with RFID are increasingly accessed across IP networks, the OECD (Organisation for Economic Co-operation and Development) is well positioned to discuss with stakeholders how best to create a positive environment for growth, and promote best practices for the implementation and use of RFID. RFID technology can be the next tool for success and management of various businesses. With more research, the flaws and limitations of this technology can be impreoved. This will make RFID technology very useful for diverse sectors like retail, transport and jewelry businesses. |