About Wireless RFID Passive Sensors (Battery-Free)
Wireless RFID Sensor Demonstration Video
About Wireless RFID Sensors
Phase IV Engineering pioneered the use of wireless RFID sensors (we developed the world’s first RFID sensor integrated circuit in 1994), and we have spent more than 25 years on the cutting edge of RFID sensor design. RFID (passive) sensors are unique in that they transmit sensor data with no battery.
Types of RFID Sensors – based on radio frequency and protocol:
- Phase IV proprietary protocol for special applications – contact us for more information
Advantages and Disadvantages of Different Passive RFID Sensor Technologies
To see the advantages and disadvantages of battery-free (passive) RFID sensors compared to other wireless technologies, see the Wireless Technologies Overview Page.
UHF EPC 915/868 MHz RFID Sensor Technology
Advantages of UHF EPC 915/868 MHz
- Much longer read ranges – up to 20 feet.
- Large installed base of UHF EPC readers.
- Sensors can be mounted on metal.
- Multiple sensors can be read by one reader.
- Reader radio waves tend to bounce around – allowing sensor readings that are not “in the line of sight”.
Disadvantages of UHF EPC 915/868 MHz
- Does not read through some materials as well as lower frequencies.
- Ultra-miniature sensor antennas are often not possible.
- Not allowed in some environments, such as many medical facilities.
- Frequency and protocols vary by country.
High Frequency (HF) 134 KHz ISO15693 RFID Sensor Technology
Disadvantages of High Frequency (HF) and NFC 13.56 MHz Advantages of Low Frequency (LF) 134 KHz Disadvantages of Low Frequency (LF) 134 KHz
Low Frequency (LF) 134 KHz RFID Sensor Technology
Typical RFID Sensor Applications:
Advantages of RFID Sensors Over Non-RFID battery-free sensors (such as SAW sensors)
Disadvantages of High Frequency (HF) and NFC 13.56 MHz
Advantages of Low Frequency (LF) 134 KHz
Disadvantages of Low Frequency (LF) 134 KHz