How LF RFID Works
As with other passive RFID technologies, an LF RFID tag does not require its own battery.
The reader provides the energy required during the reading process. When a compatible LF tag enters the reader’s usable reading area, the tag responds with its stored identification information.
The reader captures that information and can pass it to software, a database or another connected system for use.
LF RFID generally operates over relatively short reading distances compared with UHF RFID.
125 kHz – Industrial Identification
125 kHz RFID is widely associated with established industrial identification applications.
It has historically been used where reliable short-range identification is required and is already integrated into many existing systems and applications.
The suitability of any LF system still depends on the tag, reader, required reading distance, operating environment and the system with which the RFID tag must work.
134.2 kHz – Animal Identification
134.2 kHz LF RFID has a long-established role in electronic animal identification, or EID.
Its historic adoption has resulted in established standards, reader infrastructure and widespread industry familiarity.
Relevant LF animal-identification technologies include:
FDX-B
FDX-A
HDX
The HYKK AT-01003 supports these technologies under ISO 11784 / ISO 11785.
Why RFID Standards Matter
Many RFID applications operate within agreed standards so that compatible tags, readers and systems can work together consistently.
A good example is the global animal-identification industry, where 134.2 kHz LF RFID is supported by established standards including ISO 11784 and ISO 11785.
These standards help ensure that identification data can be recognised and interpreted consistently across different readers, systems, organisations and countries.
ICAR also plays an important role in the certification of relevant animal-identification tags and readers against applicable standards.
Where LF Fits
Established technology
LF has a long history of use and substantial existing infrastructure.
Short-range identification
LF is generally suited to applications where identification takes place relatively close to the reader.
Individual identification
In the animal-identification context described here, LF is only capable to read one Animal ID tag at once, and only at very close range of just a few centimeters.
Existing standards and systems
Particularly in animal EID, LF benefits from mature standards and established reader and software ecosystems.
These characteristics are not automatically advantages or disadvantages. Their importance depends on the application.
LF and UHF Are Not Interchangeable
LF and UHF RFID operate at different frequencies and use different technologies.
An LF-only reader cannot communicate with a UHF tag, and a UHF-only reader cannot communicate with an LF tag.
Where both technologies may be present, the reader infrastructure therefore needs to support the relevant frequency or frequencies.
UHF can provide capabilities such as longer practical reading distances and multi-tag identification, while LF retains the advantage of extensive existing adoption and established infrastructure in applications such as animal identification.
Start With the Requirement
LF is not automatically the right RFID technology simply because it is established.
The appropriate choice depends on factors including:
required reading distance;
what is being identified;
whether one or multiple tags must be read;
existing reader and software infrastructure;
operating environment; and
applicable standards or approvals.
The starting point should be the application requirement, followed by selection of the most appropriate RFID technology.
The most appropriate technology can also change over time. A technology that is the best fit for an application today may not remain so as RFID technologies, standards, infrastructure and application requirements evolve.
Technology selection should therefore be based on what is most appropriate for the application at the time the decision is being made, rather than assuming that an established technology will always remain the best choice.
