UHF RFID Tags

UHF RFID Tags

UHF RFID Tags contain an antenna and a radio frequency integrated circuit (IC). Some tags have special features for specific applications or environments.

A printed temperature sensor is incorporated into the IC of flexible UHF RFID tags14,15,16. However, information on the used printing technique and coupling between IC and antenna is scarce.

Improved Product Traceability

An RFID tag can be encoded with a unique identifier for the product. These identifiers can then be read by a reader to track the location and movement of inventory. This helps companies improve quality, efficiency and accuracy throughout the production process. It can also help reduce waste by limiting the number of unsellable products that must be scrapped due to misplaced or lost items.

An important factor to consider when choosing a UHF RFID tag is the frequency of operation. Unlike low-frequency LF tags, the higher frequency of UHF technology allows for longer read ranges. UHF RFID Tag This makes it ideal for tracking large volumes of inventory.

A printed antenna can be fabricated with compact dimensions and moderate gain. Conventionally, the RFIC, matching network and sensors are mounted with solder on flexible substrates. However, solder reflow temperatures exceed the glass transition temperature of many plastics and many solder compositions erode silver. This research demonstrates that integrating the sensor components with the printed antenna in a stencil-printing process allows for the creation of an integrated RFID sensor tag with compact dimensions and high reliability.

This tag is optimized for thermal barcode printers and operates in the 860-960 MHz Gen 2 UHF RFID band. It combines the functionality of an on metal tag with the ability to write to the tag and has an internal kill function, making it ideal for tracking assets in harsh environments.

Increased Efficiency

UHF RFID tags operate at a much higher frequency than LF and HF tags. These frequencies are crowded with signals from other devices like cell phones and Wi-Fi, which can interfere with data transfer speeds and cause attenuation issues. They are also sensitive to water and metals that can attenuate or detune the signal. This makes them unsuitable for use in environments with a high volume of water, or on products that are exposed to moisture or metals.

Recent developments in RFID technology have made UHF tags more suitable for hazardous areas. These improvements include improved performance in and on metal, ruggedness, and on-board memory size. These advancements allow UHF tags to be read from close range during inspections, and from long distances when equipment is moved. This provides more flexibility in the lifetime tracking of equipment within a site, and across supply chains.

A recent study investigated the effect of antenna geometry and fabrication on the read range of a UHF RFID tag. The study described an antenna design, characterization using several printing techniques, and the development of a prototype. The simulated radiation pattern of the fabricated 1.25 wavelength long dipole antenna tag showed good agreement with the theoretical patterns for such a tag, with a simulated directivity of 4.9 dBi and a half power beamwidth of 33deg.

Reduced Downtime

When an RFID reader interrogates a UHF tag, it sends a query command, which is transmitted as a wave that the tag receives. The encoded information that the chip contains then determines what action it takes. This command can be used to change or update data stored on the chip. It can also be used to launch the tag on a particular path or to perform a specific function such as opening or closing a valve or triggering a light sensor.

These tags are typically designed with a printed antenna, RFIC and at least one built-in sensor. The printed antenna consists of a dipole transmission line meandered around the RFIC and loaded with an end load matching the optimal source impedance for the chip. Dipole performance can vary depending on the material of the tag’s dielectric coating, with better results for lighter materials such as cardboard or plastic.

These tags are available in both hard and soft models, with some featuring on-metal capabilities, resistance to chemicals, and even sensing functionality for moisture or temperature. They can also be affixed using multiple methods, including adhesives and threaded fasteners. While some nxp mifare desfire staff members may initially resist the use of these devices, they can be used to improve efficiency and limit waste by reducing inventory levels. Educating healthcare teams on the value of this technology can help reduce negative perceptions and increase adoption rates.

Increased Customer Satisfaction

In addition to increasing operational efficiency, RFID enables retailers to deliver innovative customer experiences and better understand their products. For example, buy online, pickup in-store is a popular feature that has helped many retailers attract and retain customers. Similarly, RFID is used by pharmaceutical companies to track high-value inventory that supports patient safety and scientific discovery, allowing companies to provide valuable insights to their stakeholders.

RFID’s ability to withstand harsh environments has also helped it achieve significant adoption across industries. For example, active UHF tags use an internal battery to power their own signal boosting antenna and emit beacons that can be read up to 100 meters away from the tag. This makes them useful for RFID applications like toll collection, parking control and racing where time-marking is essential. These tags are commonly found in automotive, retail apparel and horticultural industry applications such as flower and tree management.

A key challenge in the development of RFID sensors is antenna miniaturization. Antennas with small longest linear dimension (L) have lower maximum antenna gain compared to larger antenna geometries. To overcome this challenge, researchers have employed a number of approaches to reduce the L dimensions of RFID antennas. These include (de-)tuning the antenna, changing its electrical properties and implementing circuits external to the RFIC mounted on flexible substrates or PCBs.

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