Packaged for tough automotive requirements: Page 3 of 4

January 31, 2013 //By Michael Pechloff, EPCOS
Packaged for tough automotive requirements
As telematics applications are becoming standard features in cars and trucks, the demand is growing for robust RF components qualified to AEC-Q200. With a footprint as small as only 1.4 mm by 1.1 mm EPCOS SAW filters are designed with a chip-sized SAW package (CSSP) to meet the requirements of the automotive industry.
inputs of 50 Ω and balanced outputs of 100 Ω.

Extended applications of mobile communications technology

When mobile phones first entered cars, their uses were limited to telephony via a hands-free setup. Now, these devices are increasingly being used to access the Internet on the road to contact local services or augment satellite-based navigation. A significant and increasingly important function is navigation responding to the momentary traffic situation. It determines how many mobile phone subscribers are logged into a cell and at what speed they are moving. The more such subscribers present in a cell and the slower they are moving, the denser the traffic or else a traffic jam has built up.

Another combined option for satellite-based navigation and mobile phones is offered by emergency call systems – such as eCall – that 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 center 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 center frequencies, insertion losses and useful bandwidths for the typical frequency bands. A selection from the current product range is shown in Table 2.

Table 2: AEC-Q200-qualified EPCOS SAW filters for mobile-communications-based applications. For full resolution click here .

 

All the listed RX filters and 2in1 components have unbalanced inputs of 50 Ω and balanced outputs of 150 Ω. All listed TX and RX diversity filters have unbalanced inputs and outputs of 50 Ω.

Internet in the car

WLAN systems operating in

Design category: 

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