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Interference with Second-generation Low-power Data Communications Systems (Wireless LANs), Cellular Phones, etc.
1. Radio Interference between Wireless Stations
The 2,450 MHz frequency band (2,434.25 to 2,465.75 MHz) used by the V690 Microwave RFID System is designated for secondgeneration low-power data communications system (wireless LANs), local area wireless stations for mobile object identification, and
specified low-power wireless stations, as well as industrial, scientific, or medical equipment, such as microwave ovens. Radio interference can be expected in this frequency band.
Second-generation low-power data communications system (wireless LAN)
Low-power data communications systems
Amateur radio
Mobile object identification (microwave RFID)
Frequency band of
the V690
Specified
frequency
band
Note: Cellular phones and personal handyphone systems (900 to 1900 MHz) may also generate radio interference.
2. Possible Trouble Due to Radio Interference
• Communications Failure in RFID Systems
The radio waves from an ID Tag to the Antenna are weak and, therefore, communications between the Antenna and ID Tag may
fail due to radio interference caused by any other devices. Keep sufficient distance between the RFID System and any other
devices. For specific distances, refer to 8-5 Distance to Wireless LAN Cellular Phone (Reference).
• ID Tag Battery Power Loss
The electronic circuits in the ID Tag may be started by radio waves from other device, causing the battery power to be consumed
considerably. The V690 has a Tag power-saving function (refer to 4-7 ID Tag Power-Saving Functions) to control the battery
power. Nevertheless, the battery power may be still consumed depending on the working environment. Keep sufficient distance
between ID Tags and any other devices. For specific distances, refer to 8-5 Distance to Wireless LAN Cellular Phone (Reference).
♦ Communications Failure in RFID System
♦ ID Tag Battery Power Loss
ID Tag
ID Tag
Antenna
Wireless LAN
Wireless LAN