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How far away can RFID be detected?
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How far away can RFID be detected?

Views: 0     Author: Site Editor     Publish Time: 2022-04-14      Origin: Site


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RFID technology is a growing market, and UHF tags are becoming increasingly popular due to their lower cost and comparable effectiveness to both low and high frequency tags. If you are looking for a new tagging or tracking system to improve your business model, RFID may be a valuable option to consider.

This passage is going to talk about the followings of RFID labeling:

1) Use of RFID in Industry

2) Types of RFID Tags

3) Introductions

1) Use of RFID in Industry

Radio Frequency Identification (RFID) has a wide range of uses, from public transportation to animal identification to product tracking. In industrial settings, RFID tags are used to track parts or assets and are useful for automation and/or logistics. Three frequency groups make up almost all RFID tags: low frequency (LF), high frequency (HF), and ultra-high frequency (UHF). Each frequency group has its own typical uses due to its inherent advantages.

2) Types of RFID Tags

There are three types of RFID tags. Active, Semi-Active (or Battery-Assisted Passive) and Passive. Active tags are tags that continuously emit a radio signal to be received by a reader. These tags have a battery or other continuous power source, and an antenna that transmits and receives the radio signal. Depending on the size, active tags can hold varying amounts of data, usually no more than a few kilobytes. Data can either be written to the active RFID tag or received from the active tag for recording or archiving. Semi-active tags, or battery-assisted passive (BAP) tags, use a battery to power the tag's integrated circuit and do not send a signal, while the signal power comes directly from the RFID reader. Both active and semi-active RFID tags have a longer operating range than passive tags.

Passive tags are powered only by the reader's magnetic field emission, which generates a current at the passive tag's antenna. In turn, the higher cost of active and semi-active tags makes them suitable only for higher-value assets.

3) Introductions

Low Frequency RFID

Low-frequency RFID has the shortest read distance, at about 10 cm between the reader and the tag. Read times are also slower, however, low frequency has the least radio interference. Low frequency coverage ranges from 30 to 300 KHz. low frequency is also not considered globally compatible due to differences in frequency and power levels around the world. Common uses of low frequency RFID include animal tracking and access control.

High Frequency RFID

High-frequency RFID is very common and operates in the frequency range of 3 to 30 MHz. reading distances range from 10 cm to 1 meter. Most HF RFID devices operate at 13.56 MHz and have moderate radio interference sensitivity.

Some uses of HF RFID involve near-field communication (NFC), which focuses on data transfer between two devices. This is often found in smart payment cards and other proximity activated devices. Other industries that use HF RFID for payment, cataloging and/or tracking include marketing, waste management, automation, health and medical, and manufacturing.

HF RFID tags come in many shapes and sizes to suit many specific purposes. They can accommodate read-only, write-only and rewritable RFID tags. Readers have memory capacities ranging from 64 bytes to 8 KB and can handle up to 20 HF tags at a time.


UHF RFID tags have the fastest read speeds and longest read ranges. While proximity UHF tags are an option, proximity UHF tags have a shorter and narrower read range than HF tags. However, proximity UHF tags are less susceptible to interference and offer performance advantages.

Long-range UHF RFID tags have a passive RFID tag read range of up to 12 m, while active tags can have a read range of 100 m or more. UHF RFID tags operate at frequencies ranging from 300 MHz to 3 GHz, and UHF tags are most susceptible to interference. To resist signal interference, UHF tag manufacturers often build readers and antennas to maintain reliability in troublesome environments.

UHF tags are less expensive to manufacture than HF tags (about 5-15 cents for tags compared to 5-2 cents for HF tags), making them appear in a variety of applications, including inventory management, anti-theft management, and wireless device configuration.

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