Fujitsu Creates Industry's Smallest SAW Filters for Mobile Applications

10/13/2005 - Fujitsu Media Devices Ltd. (FMD) and Fujitsu Laboratories Ltd. have developed the world's smallest, ultra-thin, compact SAW filters for mobile communications applications currently available on the market. This family of products contributes to the design of mobile phones and other mobile communications devices with smaller sizes, lower profiles, and higher performance.

FMD has been supplying a large number of SAW devices for mobile communications, used in particular for RF circuits within mobile phones, to manufacturers all over the world. Recently, RF front-end designs have been advanced in complexity (for example with dual-filter and front-end modules) to satisfy the needs for the higher performance, smaller size, lighter weight, and lower price of terminals.

For RF module applications in particular, there has been strong demand for components to be smaller and thinner. FMD has successfully developed dual-filter SAW products with dual-band support and the same thickness (0.5mm) as the single-filter type, satisfying market needs.

Fujitsu's SAW devices are housed in micro-miniature, ultra-thin packages, which are based on the company's proprietary sealing and high-density packaging technologies. Single-filter devices have dimensions of 1.4 x 1.0 x 0.5mm max. The new dual-filter devices now feature dimensions of 1.8 x 1.4 x 0.5mm max, or 2.0 x 1.6 x 0.5mm max.

Whilst maintaining their compactness, the SAW devices employ a hermetic structure with metal sealing in a Fujitsu proprietary enclosure. This hermetic structure not only features excellent heat and environment resistant characteristics, but also sufficient resistance to mechanical vibration and shock, providing high reliability.

Fujitsu's proprietary electrode design, also used in these new SAW filters, minimises the overall insertion loss. Looking at typical values for reception filters in a PCS system, the insertion loss is 1.4 dB and the transmission band attenuation 18 dB.

The company offers a complete family of standard SAW products supporting mobile communications devices, in particular a variety of mobile phone systems. Single-filter products are ideal for GSM850, EGSM, DCS, PCS, W-CDMA & GPS, and dual-filter for GSM850+EGSM & DCS+PCS. Fujitsu's SAW devices are also available in balanced/unbalanced and unbalanced/unbalanced terminations.

All devices currently exist in sample quantities and volume production has commenced. They will be supported in Europe by Fujitsu Microelectronics Europe.

About Fujitsu Microelectronics Europe
Fujitsu Microelectronics Europe (FME) is a major supplier of semiconductor and plasma display products. The company provides advanced systems solutions to the automotive, digital TV, mobile telephony, networking and industrial markets. Engineers from design centres dedicated to microcontrollers, mixed-signal, wireless, FRAM, multimedia ICs and ASIC products work closely with FME's marketing and sales teams throughout Europe to help satisfy customers' system development requirements. This solutions approach is supported by a broad range of advanced semiconductor devices, IP and building blocks as well as leading-edge Plasma Display Panels.

About Fujitsu Media Devices
Fujitsu Media Devices (FMD) has established itself as a leading supplier of SAW filters and SAW duplexers and of voltage-controlled oscillators for mobile communication devices, by utilising unique high-density processing, high-frequency, and other technologies, and by taking advantage of the properties and capabilities of piezoelectric single crystals. FMD supplies mobile phone manufacturers around the world with various SAW devices for mobile communications, particularly those used in the RF circuits of mobile phones. The demand for smaller and slimmer devices is particularly strong for use in modules and Fujitsu Media Devices has responded to this demand by reducing the thickness of the dual-filter SAW devices used for dual-band communications to the same thickness as single-filter devices (0.5mm).

FMD also offers small-size modules that comply with the W-LAN and Bluetooth® international standards. In addition, the company is working to develop new fields (including automotive applications) by focusing on various sensors (angular rate, acceleration, and pressure) using new MEMS processing technology.

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