Apparatus for transmitting and/or receiving radio frequency signals and method of operating such apparatus

1. An apparatus for transmitting and receiving radio frequency (RF) signals (RFS), particularly for a mobile radio device for a wireless communications system, particularly a cellular communications system, said apparatus comprising:

a primary antenna module having a first radiation pattern;

at least one secondary antenna module having a second radiation pattern which is different from said first radiation pattern of said primary antenna module; and

a control unit configured to cause the apparatus to

determine a received power of a received RF signal associated with said primary antenna module, and a received power of a received RF signal associated with said at least one secondary antenna module,

determine whether said received power of said received RF signal associated with said at least one secondary antenna module is less than a first threshold,

activate said primary antenna module in response to determining that said received power of said received RF signal associated with said at least one secondary antenna module is less than said first threshold, and

deactivate said primary antenna module in response to determining that said received power of said received RF signal associated with said at least one secondary antenna module is greater than said first threshold.

2. The apparatus according to claim 1 , wherein said first radiation pattern is an omnidirectional radiation pattern, and wherein said second radiation pattern is a non-omnidirectional radiation pattern.

3. The apparatus according to claim 1 , wherein said primary antenna module comprises a monopole antenna.

4. The apparatus according to claim 1 , wherein said at least one secondary antenna module comprises at least one linear antenna array having at least two more antenna elements.

5. The apparatus according to claim 1 , wherein said primary antenna module and said at least one secondary antenna module are arranged on a common carrier element.

6. The apparatus according to claim 1 , wherein said apparatus comprises at least two secondary antenna modules, wherein said control unit is configured to cause the apparatus to:

determine whether a received power of a received RF signal associated with one of said secondary antenna modules is greater than a second threshold; and

if said received power of said received RF signal associated with said one of said secondary antenna modules is greater than said second threshold, deactivate

a) at least one further secondary antenna module of said at least two secondary antenna modules, and

b) said primary antenna module.

7. The apparatus according to claim 1 , wherein said control unit is configured to cause the apparatus to control an electric energy supply to said primary antenna module and to said at least one secondary antenna module.

8. A mobile radio device for a wireless communications system, particularly a cellular communications system, comprising:

at least one apparatus for transmitting and receiving radio frequency (RF) signals, particularly for a mobile radio device for a wireless communications system, particularly a cellular communications system, said apparatus comprising

a primary antenna module having a first radiation pattern,

at least one secondary antenna module having a second radiation pattern, which is different from said first radiation pattern of said primary antenna module, and

a control unit configured to cause the apparatus to

determine a received power of a received RF signal associated with said primary antenna module, and a received power of a received RF signal associated with said at least one secondary antenna module,

determine whether said received power of said received RF signal associated with said at least one secondary antenna module is less than a first threshold,

activate said primary antenna module in response to determining that said received power of said received RF signal associated with said at least one secondary antenna module is less than said first threshold, and

deactivate said primary antenna module in response to determining that said received power of said received RF signal associated with said at least one secondary antenna module is greater than said first threshold.

9. The mobile radio device according to claim 8 , wherein said radio device is configured to at least temporarily operate according to the standard 3GPP TS 38.331, V15.4.0, 2018-12, and to at least temporarily use at least said primary antenna module for a target cell search depending on synchronization signal blocks according to the standard 3GPP TS 38.331, V15.4.0, 2018-12.

10. A method of operating an apparatus for transmitting and receiving radio frequency (RF) signals, particularly for a mobile radio device for a wireless communications system, particularly a cellular communications system, said apparatus comprising a primary antenna module having a first radiation pattern, at least one secondary antenna module having a second radiation pattern, which is different from said first radiation pattern of said primary antenna module, and a control unit, wherein said method comprises:

determining a received power of a received RF signal associated with said primary antenna module, and a received power of a received RF signal associated with said at least one secondary antenna module;

determining whether said received power of said received RF signal associated with said at least one secondary antenna module is less than a first threshold;

activating said primary antenna module in response to determining that said received power of said received RF signal associated with said at least one secondary antenna module is less than said first threshold; and

deactivating said primary antenna module in response to determining that said received power of said received RF signal associated with said at least one secondary antenna module is greater than said first threshold.

11. The method according to claim 10 , wherein said apparatus comprises at least two secondary antenna modules, wherein said method further comprises:

determining, by said control unit, whether a received power of a received RF signal associated with one of said secondary antenna modules is greater than a second threshold; and

if said received power of said received RF signal associated with said one of said secondary antenna modules is greater than said second threshold deactivating, by said control unit,

a) at least one further secondary antenna module of said at least two secondary antenna modules, and

b) said primary antenna module.

12. The apparatus according to claim 1 , wherein the primary antenna module comprises a quarter wavelength monopole antenna.

13. The apparatus according to claim 4 , wherein said at least two more antenna elements are patch antenna elements.

14. The apparatus according to claim 6 , wherein, in response to said received power of said received RF signal associated with said one of said secondary antenna modules being less than said second threshold, said control unit is configured to cause the apparatus to:

activate at least one further secondary antenna module of said at least two secondary antenna modules; and

activate said primary antenna module.

15. The method according to claim 11 , further comprising:

in response to said received power of said received RF signal associated with said one of said secondary antenna modules being less than said second threshold

activating at least one further secondary antenna module of said at least two secondary antenna modules, and

activating said primary antenna module.