Radio Frequency Identification (RFID) is an automatic identification technology allowing non-line-of-sight operation in contrast to well-known barcode technology. The main requirements of RFID application fields are operation frequency, read/write range, and security. The long-range passive RFID systems in which the distance between reader and passive transponder is greater than 1 m operate at UHF and microwave frequency and are backscatter coupled using electromagnetic fields. Even using low power semiconductor technology in the transponder chip, the free space path loss limits a read range of about 3 m at a transmission frequency of 915 MHz. Active transponders have a backup battery to supply power to the transponder chip in order to achieve long ranges of up to 10 m..... more...
The key challenges in RFID technology are to support connectivity to the tags at needed range, to determine accurate position of tags, and to provide communication with necessary security, while reducing the costs of the infrastructure and tags. In practice, state-of-the-art passive RFID systems are essentially low range, subjected to interference in cluttered or harsh environments and have low security. The use of Martec's Passpulse may overcome many of these application obstacles and provide key features for finding, tracking and managing assets.
Advantages of the passive UWB RFID technology include:
- longer read range;
- immunity to signal degradation and multipath effects;
- higher level of security and immunity to eavesdropping;.... more...
- greater ability for anti-collision in multi-tag environments;
- ability to locate a transponder or group of transponders. |
