| 摘要 |
A radiotelephone system for motor vehicles, having a group antenna system with a plurality of antenna elements, and a mobile radiotelephone with a high-frequency input for receiving radio signals. The group antenna system contains controllable phase and/or amplitude adjusting elements, which are set so that a directed reception with a main receiving direction is available. The controllable phase and/or amplitude adjusting elements are controlled by a processor for tracking the main receiving direction azimuthally in the direction of a fixed station with the help of a tracking signal. Controllable switching-elements for reversing antenna signals for diversity reception are integrated in the signal paths of the group antenna system so that the azimuthal main direction of reception is tracked with a defined tracking by setting a combination of the switching positions of the controllable switching elements. Thus, the antenna reception patterns are changed when the switches of the controllable switching elements are changed, and a changed received signal is available in each case on the high-frequency input of the mobile radiotelephone. When a reception interference is detected, a diversity processor selects from the possible combinations of switching positions, another combination to reduce or eliminate interference.
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