Fujitsu Develops World’s First Ultra Wide Band Ring Filter; UWB Plane Antenna with World’s Highest-Class Characteristics Per Unit Area

Fujitsu Component Ltd. [Head Office: 2-3-5 Higashi Gotanda, Shinagawa-ku, Tokyo, Capital: 2,764 Million ¥, President: Tozo Ono ] announced at the IEIEC Society Conference, held in Tokushima, Japan, September 21-24, that it has developed the world's first UWB (Ultra Wide Band) ring filter capable of being pattern-formed onto a printed circuit board ^(1*). It also announced a UWB plane antenna with the world’s highest-class characteristics per unit area ^(1*).

These developments, Fujitsu believes, present a significant step in commercializing UWB technology as the next generation, high-speed, large capacity radio LAN.

UWB is an impulse radio system that differs from the ordinary system of modulating radio waves into reference waves. Power consumption is low, and because the noise level is high, interference with other radio equipment rarely occurs.

The new UWB ring filter, jointly developed with Professor Kiyomichi Araki (Tokyo Institute of Technology), achieved a size of 33 mm x 70 mm x 0.8 mm (pattern-formed on printed circuit board); a central transmission frequency of 4.1 GHz; an attenuation characteristic of 30 dB or more in the low band area (3.1 GHz or lower), 17 dB or more in the high band area (5.1 GHz or higher); and an attenuation per 100 MHz at band edge of 10.5 dB or more in the low band area and 8 dB or more in the high band area.

The UWB plane antenna, jointly developed with Professor Takehiko Kobayashi (Tokyo Denki University), achieved a VSWR of 2.5 or less in a 3.1 GHz to 10.6 GHz range, with almost no directivity on the horizontal plane in a 40 mm x 30 mm x 0.8 mm size (pattern-formed on printed circuit board).

Fujitsu Component will continue efforts to further downsize and increase performance, while developing the technology and products for potential use in close distance, high-speed, large capacity radio LANs for information home electronic equipment.

[UWB: Ultra Wide Band]
Ultra Wide Band has been researched since the 1960s for military purposes. In February 2002, the FCC (Federal Communications Commission) authorized commercialization of the 3.1 GHz to 10.6 GHz band for output that is less than the radiation electromagnetic noise control value (-41.3 dBm/MHz). This approval positioned UWB as a high-speed and large-capacity short distance radio LAN. Development for practical use is actively progressing.

UWB has three functions—position measurement, radar, and radio communication—that make it a highly promising radio application technology. In Japan, the Information and Communications Technology subcouncil is advancing the study of UWB for practical use. This group is a subcouncil of the Information and Communications Council, which in turn reports to the Ministry of Internal Affairs and Communications.