Synchronized multiple-radio antenna systems and methods

1. A method of combining a plurality of radios so that they simultaneously send or receive from a single antenna, the method comprising:

passively combining the inputs of each of the plurality of radios into a single output coupled to the single antenna;

synchronizing each of the plurality of radios using a GPS signal, so that each of the plurality of radios is operating on a same duty cycle;

simultaneously transmitting RF signals from each of the plurality of radios using the single antenna, wherein each of the plurality of radios transmits in adjacent different frequency channels without the use of a guard band; and

simultaneously receiving RF signals in each of the plurality of radios using the single antenna.

2. The method of claim 1 , further comprising attaching each of the plurality of radios to a single antenna.

3. The method of claim 1 , wherein the duty cycle of the plurality of radios is 50/50, 67/33, or 25/75.

4. The method of claim 1 , wherein each of the plurality of radios operates in a different frequency channel, further wherein the different frequency channels are adjacent to each other without a guard band between adjacent channels.

5. The method of claim 1 , wherein the plurality of radios operate in MIMO.

6. The method of claim 1 , wherein synchronizing each of the plurality of radios using a GPS signal comprises synchronizing each of the plurality of radios without communication between the radios.

7. The method of claim 1 , wherein each of the plurality of radios independently receives the GPS signal.

8. The method of claim 1 , wherein simultaneously transmitting RF signals from each of the plurality of radios comprises simultaneously transmitting a synchronized master timing preamble from each of the plurality of radios.

9. The method of claim 1 , further comprising synchronizing a duty cycle of a first remote slave radio using a synchronized master timing preamble transmitted by each of the plurality of radios.

10. The method of claim 9 further comprising synchronizing a duty cycle of a second remote slave radio with a synchronized mater timing preamble by sliding a receiver frame until the master timing preamble is identified.

11. The method of claim 9 , further comprising transmitting RF signals from the first remote slave radio to the single antenna during a transmission frame determined by the synchronized duty cycle of the first remote slave radio.

12. The method of claim 1 , wherein synchronization of each of the plurality of radios using a GPS signal occurs every 1 second+/−15 nanoseconds.

13. The method of claim 1 , wherein passively combining the inputs of each of the plurality of radios into the single output coupled to the single antenna comprises passing inputs from each of the plurality of radios through a Wilkinson power divider/combiner having an output coupled to the single antenna.

14. The method of claim 1 , further comprising switching from an unsynchronized mode of operation to a shared antenna mode in which each of the plurality of radios is synchronized using the GPS signal to operate on the same duty cycle.

15. A method of combining a plurality of radios so that they simultaneously send or receive from a single antenna, the method comprising:

passively combining the inputs of each of the plurality of radios into a single output coupled to the single antenna;

periodically synchronizing each of the plurality of radios using a GPS signal, wherein each of the plurality of radios is operating on a same duty cycle;

transmitting a synchronized master timing preamble from each of the plurality of radios;

simultaneously transmitting RF signals from each of the plurality of radios using the single antenna, wherein each of the plurality of radios operates in different frequency channels;

simultaneously receiving RF signals in each of the plurality of radios using the single antenna; and

synchronizing a duty cycle of a first remote slave radio with the plurality of radios using the master timing preamble.

16. The method of claim 15 further comprising synchronizing a duty cycle of a second remote slave radio with the plurality of radios with a synchronized mater timing preamble by sliding a receiver frame until the master timing preamble is identified.

17. The method of claim 15 , further comprising transmitting RF signals from the first remote slave radio to the single antenna during a transmission frame determined by the synchronized duty cycle of the first remote slave radio.

18. The method of claim 15 , further comprising attaching each of the plurality of radios to a single antenna.

19. A multiplexer apparatus for combining a plurality of radios so that they simultaneously send or receive from a single antenna, the apparatus comprising: a first external mount configured to hold a first radio, and a first input configured to connect to an input of the first radio;

a second external mount configured to hold a second radio and a second input configured to connect to an input of the second radio;

a passive power divider/combiner coupled to the first input and the second input, the passive power divider/combiner configured to passively combine RF signals from the first and second input and output them to an antenna port and to divide the RF signals from the antenna port between the first and second inputs;

a multiplexer circuitry in communication with each of the first and second radio and configured establish a duty cycle for the first and second radio and indicate that the first and second radio should synchronize via an external GPS signal: and the single antenna coupled to the first and second external mounts, wherein an antenna feed is coupled to the antenna port.

20. The apparatus of claim 19 , wherein the passive power divider/combiner is a Wilkinson divider/combiner.