Nokia Mobile Phones Limited

Andreas Pietsch

Jurgen Hess

Holger Christiansen

Uwe Dalisda

Jukka-Matti Karhu

A method and a communications device are described, comprising a radio telephone ( ) with connected antenna path ( ) which can be used to locate precisely a defective area (F) in the antenna path ( ) in order to be able to repair the antenna path ( ) in a selective fashion. For this purpose, initially a wave with a starting frequency (f ) is coupled into the antenna path ( ), and the amplitude of the standing wave at an angular position is measured. Then, the frequency of the wave is increased until a corresponding amplitude is detected at the same angular position. From the frequencies present then and from a reading (n) which indicates how often the corresponding amplitude has been obtained, the fault interval (Ed) between the detector ( ) and defective area (F) is then calculated.

Fault isolation of an antenna path for a radio telephone

In order to inspect at least one antenna branch (A1, A2, . . . An), in particular in a vehicle, a power level to be radiated is initially fed into the antenna branch, after which a power level which is reflected in the antenna branch is sensed. Then, a relationship is formed between the fed-in power level and the reflected power level in order to obtain a quality signal indicating the quality of the antenna branch. This procedure can be carried out successively when there are a plurality of antenna branches, in order to select, as a function of the respective quality signal, that antenna branch at which the reflected power level is lowest. In this way, on the one hand, it is possible to check the matching of the antenna branches while, on the other hand, it is possible to ensure that, for example when specific antenna branches are damaged, it is always possible to find other antenna branches for satisfactory communication.

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Dulmen, Germany

Andreas Pietsch