One of the challenges of these systems is the directionality of the antenna and its ability to pick up the signal with the vehicle facing different directions. The nominal solution for this issue is the use of a diversity system that employs multiple antennas and has circuitry to determine which one has the strongest signal -- and then use that one
However, with the large number of antennas needed in the system (over 15 now and quickly approaching 20), initial placement of these antennas in a non-interfering manner on the vehicle is a big challenge. This is even before the duplicating of the antennas to support the diversity requirements.
The antennas are still passive, but have migrated from mast/whip antennas, to glass-mount antennas, to the new generation bee-sting antenna designs and the shark-fin modules. These are being used with a combination of the glass-mount antennas and new distributed antennas. ...
Companies like Delphi are developing new multi-antenna modules that fit into the new standard shark-fin shape and can address several of the RF requirements, including soon-to-be released LTE support.
WiFiNovation's insight:
The antenna placement and signal distribution in the vehicle design will be one of the key design considerations, on par with the safety and aesthetic design aspects.
via WiFiNovation | Scoop.it
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