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Packaged telematics suit tough automotive apps

Posted: 12 Mar 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Telematics? SAW filters? AEC-Q200?

Another combined option for satellite-based navigation and mobile phones is offered by emergency call systemssuch as eCallthat are used in the event of an accident or breakdown. This intelligent emergency call system determines the position of the vehicle via satellite and sets up a data and voice link to an emergency call centre via the mobile communications network. Vehicle fleet management and the German toll system, for example, also operate with satellite-based navigation and mobile communications technology. The frequency ranges they use depend on the regions in which they operate.

An extensive range of AEC-Q200-qualified EPCOS SAW filters (single and diplexer) is also available in package sizes of 3.0 3.0 mm² down to 1.4 1.1 mm² with various centre frequencies, insertion losses and useful bandwidths for the typical frequency bands.

Internet in the car
WLAN systems operating in the 2.4GHz frequency range are used for Internet access in cars. Some of them receive mobile phone signals via their external antenna and convert them into WLAN frequencies. This allows passengers to use the Internet with high reliability. WLAN antennas are also used in the external antennas to permit Internet access in hot spots. The B3912 SAW filter (fc=2448.5MHz) from EPCOS for applications in automotive electronics was developed specifically for WLAN frequencies.

Another application sector for WLAN will be car-to-X communications: either car-to-car communications that permit networking between vehicles, or car-to-infrastructure communications that set up links between vehicles and systems such as traffic lights. These systems will probably operate in the 5.9GHz frequency range and will also control the traffic flow at crossings more effectively and thus avoid accidents. Ongoing field trials by the automotive industry will show whether this frequency is suitable or whether its range is too short. A system of this kind called the Intelligent Traffic System (ITS) is currently being set up in Japan: it operates with a frequency of around 760MHz and is designed to control the efficiency of traffic flows.

In future, duplexers qualified to AEC-Q200 too
Intensive work is also taking place on duplexers qualified to AEC-Q200 for various mobile phone frequencies in package size 2.0 1.6 mm². They are expected to be available as engineering samples in mid-2012.

About the author
Michael Pechloff is Manager Product Marketing Automotive Electronics Systems, Acoustics, Waves Business Group for EPCOS AG. EPCOS is a Member of TDK Corporation.

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