KDDI Corp developed a microSD card featuring a wireless LAN function and exhibited it at Wireless Japan 2009, which is taking place from July 22 to 24, 2009, at Tokyo Big Sight.
The microSD card measures 11 x 16 x 0.7mm. When equipped in a mobile phone, it enables a faster Internet connection.
KDDI showcased two types of the card, which are manufactured by Mitsumi Electric Co Ltd and Renesas Technology Corp, respectively. Both of them are mounted with a wireless LAN IC compliant with IEEE802.11b/g, a transceiving antenna, passive components and so on.
As a wireless LAN IC, Mitsumi Electric employs Atheros Communications Inc's "AR6002," whose RF transceiver circuit and baseband processing circuit are integrated, while Renesas Technology uses its "KS3021" RF transceiver IC and "KS7010" baseband processing IC.
The KS3021 and KS7010 seem to be products of Key Stream Corp, which handed over its wireless LAN chip unit to Renesas Technology and liquidated in April 2009.
For both of the types, the area of the antenna is about one third that of the microSD card, KDDI said. The release date of the product is yet to be determined.