Magnetic sheets use metallic glass powder to increase RFID antenna sensitivity

2 November 2005 Passive Components

Alps Electric has developed new magnetic sheets that utilise metallic glass powder to boost the sensitivity of RFID (radio frequency identification) antennas.

RFID has recently been gaining attention as a technology that stores data on a minute wireless tag to identify people or manage goods. In recent years, non-contact power transmission technology has led to the appearance of wireless tags, which can be used semi-permanently without a battery, and with a variety of applications including pre-paid cards.

Alps developed the HMLSR Series of Liqualloy magnetic sheets to enhance electromagnetic compatibility (EMC), eliminating the problem of interference with waves that should reach the wireless tag from radio or electromagnetic waves generated by nearby parts and devices.

The sheet uses Alps' proprietary Liqualloy, a metallic glass powder consisting primarily of iron. According to the company, its amorphous structure allows a high degree of freedom in the shaping process, and it displays soft magnetic properties that can be readily activated by exposure to magnetic fields. In addition, its high permeability is 1,3 times greater than that of Fe-Al-Si alloys, the leading magnetic material, giving it superior capacity to absorb radio and electromagnetic waves, it says.

In RFID technology, it is not unusual to install parts and devices on the back of the wireless tag antennas. Under some conditions, this causes interference with waves that should reach the antenna. Alps claims these new sheets effectively focus waves to the antenna, increasing RFID antenna sensitivity.

www.alps-europe.com

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