Electronic device with multiple antenna diversity and related methods

1. An electronic device comprising:

a mobile wireless communications device comprising

a first housing,

a spatial diversity wireless transceiver carried by said first housing,

at least one first antenna carried by said first housing, and

an external antenna interface carried by said first housing and coupled to said spatial diversity wireless transceiver;

an external antenna device comprising

a second housing, and

at least one second antenna carried by said second housing and coupled to said external antenna interface; and

said spatial diversity wireless transceiver configured to operate said at least one first antenna and said at least one second antenna to provide spatial diversity;

a processor configured to operate said spatial diversity wireless transceiver in a first mode when said at least one second antenna is not coupled to said spatial diversity wireless transceiver, and a second mode when said at least one second antenna is connected to said spatial diversity wireless transceiver, the second mode providing a greater data rate than the first mode.

2. The electronic device of claim 1 wherein said external antenna interface comprises a connector; and wherein said external antenna device comprises a cable extending from said second housing and configured to be coupled to said connector.

3. The electronic device of claim 2 wherein said connector comprises a tip ring sleeve (TRS) connector.

4. The electronic device of claim 2 wherein said connector comprises a USB connector.

5. The electronic device of claim 1 wherein said external antenna interface comprises a wireless interface.

6. The electronic device of claim 5 wherein said wireless interface comprises a wireless local area networking (WLAN) transceiver.

7. The electronic device of claim 5 wherein said wireless interface comprises a Bluetooth wireless transceiver.

8. The electronic device of claim 1 wherein the first mode comprises a first multiple-input/multiple-output (MIMO) rank mode.

9. The electronic device of claim 8 wherein the second mode comprises a second MIMO rank mode, the second MIMO rank mode being greater than the first MIMO rank mode.

10. The electronic device of claim 1 wherein said spatial diversity wireless transceiver comprises a cellular 3GPP Long Term Evolution (LTE) transceiver.

11. The electronic device of claim 1 wherein said at least one first antenna is internal with respect to said first housing; and wherein said at least one second antenna is internal with respect to said second housing.

12. A mobile wireless communications device comprising:

a first housing;

a spatial diversity wireless transceiver carried by said first housing;

at least one first antenna carried by said first housing;

an external antenna interface carried by said first housing and coupled to said spatial diversity wireless transceiver;

said spatial diversity wireless transceiver configured to operate said at least one first antenna and at least one second antenna to provide spatial diversity, the at least one second antenna carried by a second housing; and

a processor configured to operate said spatial diversity wireless transceiver in a first mode when the at least one second antenna is not coupled to said spatial diversity wireless transceiver, and a second mode when the at least one second antenna is connected to said spatial diversity wireless transceiver, the second mode providing a greater data rate than the first mode.

13. The mobile wireless communications device of claim 12 wherein said external antenna interface comprises a connector.

14. The mobile wireless communications device of claim 13 wherein said connector comprises a tip ring sleeve (TRS) connector.

15. The mobile wireless communications device of claim 13 wherein said connector comprises a USB connector.

16. The mobile wireless communications device of claim 12 wherein said external antenna interface comprises a wireless interface.

17. The mobile wireless communications device of claim 16 wherein said external antenna interface comprises a wireless local area networking (WLAN) transceiver.

18. The mobile wireless communications device of claim 16 wherein said external antenna interface comprises a Bluetooth wireless transceiver.

19. The mobile wireless communications device of claim 12 wherein said spatial diversity wireless transceiver comprises a cellular 3GPP Long Term Evolution (LTE) transceiver.

20. The mobile wireless communications device of claim 12 wherein said at least one first antenna is internal with respect to said first housing.

21. A method of providing spatial diversity in an electronic device comprising a mobile wireless communications device including a first housing, a spatial diversity wireless transceiver carried by the first housing, at least one first antenna carried by the first housing, and an external antenna interface carried by the first housing and coupled to the spatial diversity wireless transceiver, the method comprising:

coupling an external antenna device to the external antenna interface, the external antenna device comprising a second housing, and at least one second antenna carried by the second housing;

using the spatial diversity wireless transceiver to operate the at least one first antenna and the at least one second antenna to provide spatial diversity; and

operating the spatial diversity wireless transceiver in a first mode when the at least one second antenna is not coupled to the spatial diversity wireless transceiver, and a second mode when the at least one second antenna is connected to the spatial diversity wireless transceiver, the second mode providing a greater data rate than the first mode.

22. The method of claim 21 wherein the interface comprises a connector.

23. The method of claim 21 wherein the interface comprises a wireless interface.