Telematics is becoming increasingly important for road transport and thus also in on-board automotive systems. The list of technologies linking telecommunications and IT is growing continuously for both passenger cars and utility vehicles. They include classical satellite-based navigation using systems such as GPS, Galileo, Glonass and mobile phones as well as mobile-phone supported traffic guidance systems and Internet access inclusive of local services. But also WLAN, emergency call systems such as eCall for use in the event of an accident, vehicle fleet management, car-to-X communications and toll systems.
The overwhelming majority of telematics functions in cars have so far been limited to devices that can only receive information such as GPS. With the additional use of mobile phones, however, more and more devices are being used that are capable of both transmission and reception. Application-specific SAW filters from EPCOS in various package sizes qualified to AEC-Q200 are particularly well suited for such purposes.
Reliability and miniaturization in one
Up until now, compromises were often unavoidable in SAW filters for telematics or mobile-phone based applications in cars: they used either compact package sizes of the kind typical for mobile phone technology, or else highly reliable rugged variants meeting the requirements of the automotive industry.
SAW filters from EPCOS in the CSSP package with dimensions of 1.4 × 1.1 mm2 can now meet the required high reliability and qualification to AEC-Q200 that are already available for those with dimensions of 3.0 × 3.0 mm2. SAW components in the CSSP package have already been an established standard in mobile phone technology for many years. Compromises between reliability and miniaturization thus belong to the past (Figure 1).
The new EPCOS SAW filters for automotive electronics applications are the first worldwide in the miniaturized package size 1.4 × 1.1 mm2 qualified to AEC-Q200. The product range of these qualified and space-saving SAW filters is being continuously extended in line with customer requirements.