Why does RFID have different frequency bands?
Wireless communication requires work under the agreed frequency and protocol system. The LF, HF and HHF use different frequency ranges, as well as different electromagnetic coupling methods, label antennas, equipment structures and communication characteristics, and therefore different product systems and application habits.
The frequency bands affect the designable reading distance, multilabelling, label size and performance of environmental factors such as metals, liquids, etc., but they are not the only variables. Under the same band, there are still significant differences between labels, RFID Reader, antennas and installation.
Projects cannot select a much stronger frequency before imposing a fit-for-business. A more rational sequence is to identify the target, distance, number and process, and then to choose a technology system that can stabilize the mission.
What's the LF RFID character?
Labels and reading and writing equipment are used in accordance with the corresponding protocol.
The label sealing, reading speed, installation space and industry standards need to be confirmed in conjunction with actual product specifications.
It is not “short distance, so backward” but rather different work characteristics. When LF is appropriate for target audiences, industry norms or environmental conditions, the use of LF may be more reliable than the pursuit of a distance.
What's the feature of HF RFID?
The system is used for card, book, ticket and part of the close-in recognition application.
NFC also works at 13.56 MHz, which can be considered a near-field communication technology in this frequency system, and has added to the protocol and use of interaction with mobile phones and devices. But it cannot call all HF RFIDs NFCs, nor can it be implied that all HF labels are read on the phone.
If a project requires mobile phone interaction, it should further confirm label type, protocol and cell phone compatibility; if only dedicated equipment is required to read the card, it should be selected according to operational standards and equipment capabilities, rather than only the 13.56 MHz frequency.
What's the character of the UHF RFID?
The usual passive UHF tags can be read through handheld terminals or fixed RFID Reader, and the system links the label codes to the asset, commodity, tool or cargo files.
The scenarios of Asset Inventory, warehouse access, door-to-door inventory, loan of furniture and appliances and smart cabinets are regularly assessed because these operations often require more target identification or less-specified operation.
The distance of the UHF to read does not have a fixed answer. Metals, liquids, label orientation, antenna position and stacking of labels can affect the outcome, and should be determined by real-life testing.How far does RFID Tag usually read? What factors influence it?。
How should LF, HF and HHF compare?
| Comparative item | LF | HF | UHF |
|---|---|---|---|
| Frequency band | Low frequency system, specific frequency confirmed by standard and equipment | Common 13.56 MHz | Use of specified UHF bands in different countries and territories |
| Read Characteristics | Usually close, well-targeted. | Usually close-range coupling and interaction | Different reading areas can be designed to support non-contact identification |
| Multiple Label Capability | Depending on the specific agreement and equipment | Depending on the specific agreement and application | Often used for multi-label recognition, the effect depends on the system condition |
| Environmental characteristics | LFs use a near-situ sensor coupling, which is usually more controlable in a water-containing or complex medium environment than in a long-range radio frequency, but the specific effects are still subject to label size, installation and on-site environmental impacts | Near-site applications need to focus on installation materials | Sensitivity to metals, liquids, direction and reflection |
| Tab Form | Loop or special seal label | Cards, stickers, tickets, etc. | Adhesive labels, hang tags, anti-metal tags, and various packaging options |
| Common applications | Animals, vehicles, industrial carriers, etc. | Cards, books, tickets and NFC-related applications | Assets, storage, retailing, furniture and automatic collection |
The tables are used only to understand the technical direction and cannot replace specific product specifications and field tests.
How should enterprise projects select frequency bands?
- What are the targets identified, whether there are industry standards or designated carriers
- How close or far to read, and whether to form a clearly identified area
- One object or more objects at a time
- Location, size and direction of labels to be installed
- Whether the object contains metals, liquids or is in a complex reflection environment
- Business requires a positive approach or automatic sensory experience
- Use handheld terminals, fixed devices, mobile phones or special card readers
The same project may also combine different technologies, such as mobile phone 2D or NFC, which interacts with the responsible person, and the UHF, which is responsible for the bulk inventory. The key is to have each technology assume the right link and to harmonize the object identification and operational rules in the system.
The selection should be preceded by the preparation of real items, typical placements and operational tasks for validation. The frequency band is the starting point for decision-making and the final judgement remains whether the actual process can be stabilized.
FAQs
Is the UHF RFID the remotest to read?
In common passive RFID applications, the UHF can normally design larger reading areas, but the physical distance is determined by the label, equipment, antenna, power, installation mode and environment, and cannot be guaranteed by frequency bands alone.
Is the NFC and the HF RFID one thing?
Not exactly the same. NFC works at 13.56 MHz, which is a near-field communication technology in the frequency system; HF RFID also contains other protocols and applications that cannot all be directly referred to as NFC.
Does the UHF RFID fit Asset Inventory?
Many Fixed Assets projects assess the bulk identification capabilities of the HHF, but still need to be selected according to the material of the asset, the label location, the inventory method and the field environment test.
Can a project use different RFID technologies at the same time?
This could be provided that different technologies serve a clear business segment and harmonize coding, object files and data rules in the back.