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1. WO2000035124 - SYSTEME A DEUX ANTENNES

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[ EN ]

CLAIMS :
1. A mobile communication device having a housing (15), said device comprising antenna means and signal
processing means coupled to said antenna means, said antenna means comprising at least two antennas (1, 2) having different radiation patterns,

at least two of said at least two antennas and the corresponding said signal processing means being adapted for transmitting and receiving electromagnetic signals.

2. A mobile communication device according to claim 1, characterised in that the at least two antennas operate at the same frequency bands .

3. A mobile communication device according to claim 1 or

2 , characterised in that each of the at least two
antennas have directive radiation patterns.

4. A mobile communication device according to claims 1 - 3, characterised in that at least one of the antennas is an antenna having a directive radiation pattern.

5. A mobile communication device according to claims 1-3, characterised in that the directivity of the at least two antennas (1, 2) are in opposite directions.

6. A mobile communication device according to claims 1-3, characterised in that the at least two antennas (1, 2) are omni -directional .

7. A mobile communication device according to claims 1-5, characterised in that the antennas are patch antennas (1, 2) arranged within the housing.

8. A mobile communication device according to claims 1-7, characterised in that the device comprises power
detecting means (52, 53), said power detecting means being adapted to detect power reflected from at least one of the at least two antennas (1, 2) .

9. A mobile communication device according to claim 8, characterised in that the power detecting means is connected to an electromagnetic coupler (51) coupled to an output stage (50) of said device,

said electromagnetic coupler (51) being connected to a power detector (52) adapted to measure the power of the transmitted signals from the output stage (50) to the antenna (1, 2) connected to said output stage (50),

said electromagnetic coupler (51) being further connected to a power detector (53) adapted to measure the power of the reflected signal from the antenna (1, 2) connected to said output stage (50) .

10. A mobile communication device according to claims 1-9, characterised in that the device comprises switching means (58) coupled between said antenna means and said signal processing means, said switching means being adapted to switch automatically between the antennas (1, 2) of said antenna means in dependence of the detected power by said power detecting means.

11. A mobile communication device according to claims 1-10, characterised in that the power detecting means comprises a diode detector.

12. A mobile communication device according to claims 1-10, characterised in that the power detecting means comprises a logarithmic amplifier.

13. A mobile communication device according to claims 1- 12, characterised in that the voltage of the diode detector (also the output of the logarithmic amplifier) is measured during the transmission bursts.

14. A mobile communication device according to claims 1- 13, characterised in that Rxqual is used as an indicator of the degree to which the antennas (1, 2) are de-tuned.

15. A mobile communication device according to claims 1- 14, characterised in that the antenna (1, 2) for
transmission and/or reception is selected on a burst to burst basis.

16. A mobile communication device according to claims 1- 15, characterised in that a counter for each C-tx is set to zero when a handset of said device is switched on, and each time there is a switch between the antennas.

17. A mobile communication device according to claims 1- 16, characterised in that when the handset is switched on, a counter for each TX band and for each RX band is set to zero.

18. A mobile communication device according to claims 1- 17, characterised in that the counter, C-tx, is increased by a number according to the amount of reflected power after each transmitted burst.

19. A mobile communication device according to claims 1- 18, characterised in that when the counter, C-tx, reaches a number higher than a predetermined limit, C-tx-max, the counter, C-tx, is reset to zero, and the opposite antenna (1, 2) is selected for the next burst.

20. A mobile communication device according to claims 1- 19, characterised in that it comprises means for
evaluation of the receiving quality.

21. A mobile communication device according to claims 1- 20, characterised in that the means for evaluation of the receiving quality comprises means for determining the Rxqual value of the received signal .

22. A mobile communication device according to claims 1- 21, characterised in that the Rxqual value of the received signal is the BER or FER value.

23. Method of controlling switching means in a mobile communication device comprising antenna means and signal processing means coupled to said antenna means, said antenna means comprising at least two antennas having different directivity patterns,

said switching means being arranged between said antenna means and said signal processing means in such a way that the switching means in each possible position (58a, 58b) are connected to one of the said at least two antennas (1, 2) and to said signal processing means, the method comprising the steps of

measuring the signal quality transmitted or received by the selected one of the at least two antennas (1, 2), and

switching the switching means to another possible position (58a, 58b) in dependence of the measured signal quality.

24. Method of controlling switching means in a mobile communication device comprising antenna means and signal processing means coupled to said antenna means, said antenna means comprising at least two antennas,

said switching means being arranged between said antenna means and said signal processing means in such a way that the switching means in each possible position (58a, 58b) connects one of the said at least two antennas (1, 2) to said signal processing means, the method comprising the steps of measuring the transmitting and receiving quality of the signal transmitted or received by the connected of the at least two antennas (1, 2), and

switching the switching means to another possible position (58a, 58b) in dependence of the measured transmitting and/or receiving quality.

25. Method of controlling switching means in a mobile communication device according to claim 24, characterised in that the at least two antennas have different
radiation patterns.

26. Method of controlling switching means in a mobile communication device according to claims 24 or 25, characterised in that at least one of the antennas is an antenna having a directive radiation pattern.

27. Method of controlling switching means in a mobile communication device according to claims 24-26,
characterised in that each of the at least two antennas have directive radiation patterns.

28. Method of controlling switching means in a mobile communication device according to claims 24, 25, 26 or

27, characterised in that at least one of the antennas (1, 2) is a directive antenna, said directive antenna being the preferred antenna.

29. A mobile communication device having a housing (15), said device comprising antenna means and signal
processing means coupled to said antenna means,

said antenna means comprising at least two antennas (1, 2) having different radiation patterns,

said device comprising means for evaluating the quality of the transmission from at least one of the at least two antennas.

30. A mobile communication device according to claim 26, characterised in that device comprises indication means, said indication means being adapted to provide a warning signal representing undesired transmitting conditions under certain predefined conditions.