Stacked patch antennas

1. An antenna assembly comprising:

a first patch antenna including a first feed point, the first patch antenna tuned to a first frequency;

a second patch antenna including a second feed point, the second patch antenna tuned to a second frequency;

a low noise amplifier in communication with the first and second feed points of the respective first and second patch antennas for amplifying signals received by the first and second patch antennas;

an electrical circuit in communication with the first and second feed points of the respective first and second patch antennas, the electrical circuit operable for providing a signal output for signals received by the first and second patch antennas, and wherein the low noise amplifier receives a signal from the signal output of the electrical circuit.

2. The antenna assembly of claim 1 , wherein the first frequency is associated with a satellite digital radio service, and wherein the second frequency is associated with a global positioning system.

3. The antenna assembly of claim 1 , wherein the antenna assembly includes only one said low noise amplifier that is shared by the first and second patch antennas.

4. The antenna assembly of claim 1 , further comprising

first and second band pass filters that receive a signal from an output of the low noise amplifier.

5. An antenna assembly comprising:

a first patch antenna including a first feed point, the first patch antenna tuned to a first frequency;

a second patch antenna including a second feed point, the second patch antenna tuned to a second frequency;

a low noise amplifier in communication with the first and second feed points of the respective first and second patch antennas for amplifying signals received by the first and second patch antennas;

means for providing a signal output for signals received by the first and second patch antennas, and wherein the low noise amplifier receives a signal from the signal output.

6. An antenna assembly comprising:

a first patch antenna including a first feed point, the first patch antenna tuned to a first frequency;

a second patch antenna including a second feed point, the second patch antenna tuned to a second frequency;

a low noise amplifier in communication with the first and second feed points of the respective first and second patch antennas for amplifying signals received by the first and second patch antennas;

a transmission line in communication with the first and second feed points of the respective first and second patch antennas, the transmission line providing a signal output for signals received by the first and second patch antennas, and wherein the low noise amplifier receives a signal from the signal output.

7. The antenna assembly of claim 6 , wherein the transmission line is formed on a printed circuit board.

8. The antenna assembly of claim 7 , wherein the transmission line comprises a circuit board trace.

9. The antenna assembly of claim 8 , wherein the circuit board trace includes a meandering pattern.

10. The antenna assembly of claim 6 , wherein the transmission line comprises a one-quarter wavelength transformer at a frequency associated with a global positioning system.

11. The antenna assembly of claim 6 , wherein the transmission line has a characteristic impedance of fifty ohms between the first patch antenna and second patch antenna.

12. The antenna assembly of claim 6 , wherein a length of the transmission line is one-quarter wavelength at a frequency associated with global positioning system, and wherein the length of the transmission line is about one and one-half wavelength at a frequency associated with a satellite digital radio service.

13. An antenna assembly comprising:

a first patch antenna including a first feed roint. the first patch antenna tuned to a first frequency;

a second patch antenna including a second feed point, the second patch antenna tuned to a second frequency;

a low noise amplifier in communication with the first and second feed points of the respective first and second patch antennas for amplifying signals received by the first and second patch antennas;

first and second band pass filters that receive a signal from an output of the low noise amplifier; and

an amplifier that receives a signal from an output of the first band pass filter and receives a signal from the output of the second band pass filter, and wherein the amplifier generates an output signal of the antenna assembly.

14. The antenna assembly of claim 13 , wherein the antenna assembly includes only one said amplifier.

15. The antenna assembly of claim 13 wherein the amplifier is configured for communication with a diplexer that receives and divides the output signal from the amplifier into a first signal centered at the first frequency for a first radio receiver, and a second signal centered at the second frequency for a second radio receiver.

16. The antenna assembly of claim 15 , further comprising a single communication link for communicating the output signal from the amplifier to a diplexer.

17. The antenna assembly of claim 16 , wherein the single communication link comprises a single coaxial cable.

18. A method relating to operation of an antenna system including first and second patch antennas, the first patch antenna including a first feed point and being tuned to a first frequency, the second patch antenna including a second feed point and being tuned to a second frequency, the method comprising inputting a signal output for signals received by the first and second patch antennas to a low noise amplifier for amplification, wherein inputting a signal output includes using a transmission line having a first end in communication with the first feed point and a second end in communication with the second feed point, one of the first and second ends of the transmission line providing the signal output.

19. A method relating to operation of an antenna system including first and second patch antennas, the first patch antenna including a first feed point and being tuned to a first frequency, the second patch antenna including a second feed point and being tuned to a second frequency, the method comprising inputting a signal output for signals received by the first and second patch antennas to a low noise amplifier for amplification, wherein inputting a signal output includes using an electrical circuit in communication with the first and second feed points of the respective first and second patch antennas, the electrical circuit providing the signal output.

20. A method relating to operation of an antenna system including first and second patch antennas, the first patch antenna including a first feed point and being tuned to a first frequency, the second patch antenna including a second feed point and being tuned to a second frequency, the method comprising:

inputting a signal output for signals received by the first and second patch antennas to a low noise amplifier for amplification;

outputting a signal from the low noise amplifier to first and second band pass filters;

inputting signals from the first and second band pass filters to an amplifier, the amplifier generating an output signal of the antenna assembly; and

dividing the output signal from the amplifier into a first signal centered at the first frequency for a first radio receiver, and a second signal centered at the second frequency for a second radio receiver.

21. An antenna assembly comprising:

a first patch antenna including a first feed point, the first patch antenna tuned to a first frequency associated with a satellite digital radio service;

a second patch antenna including a second feed point, the second patch antenna tuned to a second frequency associated with a global positioning system;

a single low noise amplifier in communication with and shared by the first and second patch antennas for amplifying signals received by the first and second patch antennas; and

a feed in communication with the first and second feed points of the respective first and second patch antennas, the feed providing a signal output for signals received by the first and second patch antennas, and wherein the low noise amplifier receives a signal from the signal output.