What is ultra-high frequency (UHF) passive RFID tag?

When it comes to radio frequency identification (RFID) solutions, ultra-high frequency (UHF) passive RFID tags are an extremely popular option because they are very cost-effective, yet still have one of the longest read ranges. They have no power of their own — which is why they are called “passive” tags — so they are powered by the radio frequency energy transmitted from RFID readers/antennas. A UHF passive RFID tag consists of four sub-components: and RFID chip, an antenna, an inlay, and a carrier.

The RFID chip is an integrated circuit that provides several key attributes related to operating frequency, memory type and capacity, data transmission/receipt, and power. In other words, the chip is the brains of the RFID tag. The antenna, which is attached to the chip, collects radio frequency waves used to power the chip. The antenna also transmits attribute data from the chip. Together, the chip and the antenna comprise the RFID inlay.

An inlay is typically a plastic substrate that the chip and antenna are placed on so they can be connected. Inlays come in two types: wet and dry. A wet inlay features an adhesive so it can be applied to a surface; a dry inlay has no adhesive. The choice of inlay depends on the purpose and placement of the tag on an object.

There are literally hundreds of different types of inlays, each designed with a specific application in mind. Different industries have different requirements for inlays, so there are inlays for pharmaceutical, automotive, retail, manufacturing, and healthcare applications. The inlays are designed for optimum performance when affixed to the material they are intended for. Inlay manufacturers ship their products to RFID tag producers, like Lowry Solutions, who then produce finished products that are ready to be applied.

The carrier is the material or package that the inlay is placed in. The simplest carrier is label stock (think barcode label), where the inlay is laminated into the label stock using specialized converting equipment. Examples of other carriers include plastic capsules or ID badges. Sometimes carriers are made of specialized materials that make it easy to mount the RFID tag on liquid containers or metal, or in high-heat or hazardous environments. These types of carriers are often referred to as “hard tags.”

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Tag usually starts as an inlay (or insert), which is essentially a complete tag that is ready to be embedded in a label or encapsulated.

An inlay consists of an IC, an antenna, attached to the substrate. Typically, the substrate does not have an adhesive. The inlays are supplied on a reel of continuous web and are used by label makers, also called converters, to embed RFID functions into labels. The continuous form of inlays helps assemble labels on high-speed equipment.


RFID Labels, also known as stickers, can be used to add contactless technology to any type of form factor.

oprfid.com offer labels & stickers with various technologies, the most popular of these is MIFARE stickers which seamlessly work with NFC readers as well as being compatible with NFC enabled smart phones, making them perfect for interactive advertisement.

MIFARE stickers, also known as labels, can be encoded and read like any other smart card. We also offer labels with other technologies such as NTAG, ICODE and Alien Higgs. Typical applications include events, hospitality, transport and security.

Want to know more about labels/stickers or don’t see the label you require? Please contact us and we will be happy to assist you.

OPRFID Technologies., LTD.
2104 Room SANDI International Finance Centre, 249# MingXin Street LongQiao, ChengXiang Putian City Fujian, P.R, China.
P.C: 351100
Tel: (0086)594 2790031
Fax: (0086)594 2790185


Radio Frequency Identification (RFID) is the major advance in baggage handling technology that has emerged over the last few years. While only a handful of airports around the world are using RFID, the technology is gaining momentum as an efficient way to optimize the baggage handling process beyond conventional technology based on bar-coded baggage tags.

RFID’s ascension as the preferred baggage tracking technology can largely be attributed to its ability to provide virtually perfect end-to-end sorting, tracking and tracing. Because bar code-based systems require a line-of-sight read by a laser, damaged and folded-under bag tags result in read accuracies of only 85 to 90 percent. The remaining 10 to 15 percent leaves a wide margin for error in matching bags to the right passenger and flight.

RFID-based systems, because they use radio frequency waves and do not require a line-of-sight read, are able to read bag tags from virtually any vantage point, even those lying underneath a bag. As such, RFID-based systems avoid the potential for lost luggage that can occur with bar code-based systems, ultimately increasing passenger satisfaction.

RFID application in Supply Chain

RFID application in Supply Chain, Inventory and Logistics

Let’s look at how RFID solutions provide significant benefits over barcoding for supply chain operations.
– End-to-end track and trace capabilities reduce counterfeiting, theft, billing disputes and charge-back fees while protecting the brand.
– Real-time, automated data capture reveals process improvement, increased efficiency and cost control opportunities.
– Specific data such as manufacturing location; ship date, lot number, etc. is associated with the individual product, carton and/or pallet supporting simpler and more effective recall or product tracking processes.
– Elimination of line-of-sight, tag orientation, or bar code label quality requirements; manual data entry and operator error plus increased read range enables faster, more accurate inventory management.
– Just-in-time inventory resupply, from manufacturing through distribution to point of sale reduces costs and out-of-stocks, increases inventory turn and creates higher customer satisfaction.

RFID Application in Access Contol

RFID Application in Access Contol
Access Control is a system which enables an authority to control access to areas in a given physical facilities. An access control point, which can be a door, turnstile, parking gate, elevator or other physical barrier where granting access can be controlled using RFID technology.

Data security is generally very high using RFID technology. It also reduces the possibility of duplicating credentials. Secure or proprietary communication protocols can also be used to further enhance security.

An RFID based Access Control reader does not usually make an access decision but send a card number to an Access Control panel that verifies the number against an access list. Generally only entry is controlled and exit is uncontrolled. In cases where exit is also controlled a second reader is used on the opposite side of the door. The typical RFID tag is an RFID based contactless smartcard, key fob, wristband or smartphone sticker.

RFID based Access Control Systems are typically used for Enterprise Access, Car Park Access, Access to Gyms or Swimming Areas, Event Access, Library Access or Access to Hotel Rooms.

RFID Vehicle Tracking

RFID Vehicle Tracking
OPRFID’s RFID Vehicle Tracking Solutions provide accurate, scalable and extremely reliable identification to seamlessly manage and control the movement of vehicles.

RFID tags are mounted on vehicles and fixed RFID infrastructure is placed at strategic locations such as entry/ exit gates, weigh-bridges, parking lots and equipment. This allows completely automated wireless identification of vehicles without impacting on existing vehicle processes.

OPRFID designs solutions that are suitable for any size business problem, and our system architecture and software suite are flexible enough to support any business requirement. Our Vehicle Tracking Solutions can add the following efficiencies to vehicle management processes:

Dealership Vehicle Management – Automatically track the movement of vehicles car throughout dealerships, including post sale return visits.

Traffic & Queue Management – Automatically control the flow of vehicles to maximise efficiency and prevent operational gridlock.

Driver Identification – Gain visibility into who is driving which vehicles and at what time.

Gate Automation – Seamlessly manage gate operations without manual processing.

Weighbridge Automation – Automatically identify trucks at weighbridges, tying their vehicle identification data and weight measurements to increase process efficiency and transactional accuracy.

Collision Avoidance – Designed to help prevent collisions between heavy and light vehicles, an alert is generated when a truck comes within a defined range of another vehicle. Certified for use in underground mines, these automatic proximity alerts help to minimise costly and dangerous accidents.

Associated Assets – Trucks and their associated assets (trailers, containers, returnable items and inventory) are linked to determine the identity responsible for each movement.

RFID inlay Definition

RFID inlay
The RFID tag in a smart label. It comprises the chip and aluminum, copper or silver antenna bonded to a polyethylene terephthalate (PET) layer that is delivered to the label maker “dry inlay” (without adhesive) or “wet inlay” (attached to a pressure sensitive liner). The inlay is adhered to the back side of the label and printed and encoded in an RFID printer. See RFID tag, RFID reader, RFID printer and RFID.

A Roll of Inlays
Inlays are delivered to the label maker in a roll such as these dual dipole “Frog” inlays from UPM Raflatac. They are adhered to the back of the smart label, which is then printed and encoded in an RFID printer.

What Is an RFID Inlay?

What Is an RFID Inlay?
Radio-frequency identification, or RFID, technology provides identifying information about a person or an object, much like barcode technology does. The RFID inlay — which can be as small as a grain of rice — is the functional part of an RFID tag’s label that encodes the identifying information. The RFID inlay uses radio frequency waves to relay information to a computer system via an RFID reader.

RFID Inlay Components
The RFID inlay consists of two components. An integrated circuit or microchip that stores personal identifying information attaches to a small coil of aluminum, copper or silver wires called the antenna, which transmits and receives radio frequency signals. The microchip and antenna are then placed on a label, and the entire unit is encased in plastic.

How RFID Inlay Works
Data from the microchip passes to the RFID tag’s antenna, where it is read by the antenna of an RFID reader and passed onto a host computer system for archival purposes, processing or analysis.

RFID Inlay Types
RFID inlays are classified as “wet” or “dry.” RFID inlays are considered “wet” if an adhesive is applied to the inlay to adhere it to a pressure-sensitive liner that comprises the label. Inlays are considered “dry” when the inlay is attached to the label without the use of an adhesive.

What benefits does RFID have over barcodes ?

RFID is a read/write technology. It can write / program the data after it is attached to the product. This offers a higher level of flexibility to track and update the data as the product goes through the supply chain, into the end use application or beyond.

1) Barcode labels must be seen to be read. RFID labels / tags do not have to be seen to be read.

2) Barcode labels may not be readable if they are incomplete or dirty. RFID labels / tags integrity are maintained as there are underneath the actual labels / tags, inserted within the packaging or incased in a durable material.

3) Barcode labels must be placed on the outside of the product / packaging. RFID labels / tags can be read even when multiple tagged products are sealed inside a carton (for example).

4) Barcode labels must be orientated on the product / packaging so the barcode is in-line with the scanner. RFID labels / tags are often orientation insensitive, meaning the tagged item not only does not have to be seen to be read, but also can be in any orientation.

5) Barcode labels provide only one ID for each package of a carton, pallet or individual package of a product. For example: a 12 ounce bottle of your favorite soda will have the same barcode on every 12 ounce bottle of that same soda. RFID labels / tags provide an unique ID for each product and can be associated with individual information such as the manufacturing location, date shipped, lot number etc.

6) Barcode labels are printed, or written once, and cannot be changed at any time throughout the supply chain without another barcode label attached over the original label. RFID labels / tags provide read/write technology. The data can be written / programmed, can be changed or updated at any time in the supply chain and even into the end use application or beyond.