Circular patch array for anti-jam GPS
View Patent ↗The system and method of global positioning system (GPS) anti-jam (AJ) AJ antennas utilizing a circular array of patch antennas. In some cases the circular array is conformal. The elements are single patch, dual band (L1/L2) and are linearly polarized. A mode former and progressive phase tapers are used.
1. An anti-jamming global positioning system patch antenna array, comprising:
a plurality of linearly polarized antenna elements, arranged radially about an axis, wherein each of the plurality of linearly polarized elements are tuned to be resonant in a first dimension at L1 and a second dimension L2, where L1 and L2 are orthogonal;
each of the plurality of linearly polarized elements comprising a single layer and having a single feed; and
a mode former being configured to combine an output from each of the plurality of linearly polarized antenna elements to form a plurality of modes, where the number of modes is equal to the number of linearly polarized antenna elements;
the plurality of linearly polarized antenna elements creating, via the mode former, a right hand circularly polarized (RHCP) reference pattern and additional auxiliary omnidirectional patterns that can be used in null processing;
each auxiliary mode produces a unique rate of phase change with respect to an angle of arrival that is frequency independent.
2. The anti-jamming global positioning system patch antenna array according to claim 1 , wherein L1 is about 1575 MHz and L2 is about 1228 MHz.
3. The anti-jamming global positioning system patch antenna array according to claim 2 , wherein the antenna array is narrowband at about 24 MHz and ±12 MHz about the center frequency.
4. The anti-jamming global positioning system patch antenna array according to claim 1 , wherein L1 is radially aligned toward a center of the radial array and L2 is circumferentially aligned in reference to the radial array.
5. The anti-jamming global positioning system patch antenna array according to claim 1 , wherein the plurality of linearly polarized elements is five linearly polarized elements.
6. The anti-jamming global positioning system patch antenna array according to claim 1 , wherein the single layer comprises metallized ceramic.
7. The anti-jamming global positioning system patch antenna array according to claim 6 , wherein the antenna array is mounted to a conformal substrate.
8. The anti-jamming global positioning system patch antenna array according to claim 7 , further comprising a ceramic radome.
9. The anti-jamming global positioning system patch antenna array according to claim 5 , wherein the five elements have a progressive phase taper of −72° counter clockwise.
10. A method of producing an anti-jamming global positioning system signal, comprising:
providing a patch antenna array, comprising:
a plurality of linearly polarized antenna elements, arranged radially about an axis, wherein each of the plurality of linearly polarized elements are tuned to be resonant in a first dimension at L1 and a second dimension L2, where L1 and L2 are orthogonal;
each of the plurality of linearly polarized elements comprising a single layer and having a single feed; and
a mode former being configured to combine an output from each of the plurality of linearly polarized antenna elements to form a plurality of modes, where the number of modes is equal to the number of linearly polarized antenna elements;
creating via the plurality of linearly polarized antenna elements and the mode former, a right hand circularly polarized (RHCP) reference pattern and additional auxiliary omnidirectional patterns that can be used in null processing;
each auxiliary mode producing a unique rate of phase change with respect to an angle of arrival that is frequency independent.
11. The method of producing an anti-jamming global positioning system signal according to claim 10 , wherein L1 is about 1575 MHz and L2 is about 1228 MHz.
12. The method of producing an anti-jamming global positioning system signal according to claim 11 , wherein the antenna array is narrowband at about 24 MHz and ±12 MHz about the center frequency.
13. The method of producing an anti-jamming global positioning system signal according to claim 10 , wherein L1 is radially aligned toward a center of the radial array and L2 is circumferentially aligned in reference to the radial array.
14. The method of producing an anti-jamming global positioning system signal according to claim 10 , wherein the plurality of linearly polarized elements is five linearly polarized elements.
15. The method of producing an anti-jamming global positioning system signal according to claim 10 , wherein the single layer comprises metallized ceramic.
16. The method of producing an anti-jamming global positioning system signal according to claim 15 , wherein the antenna array is mounted to a conformal substrate.
17. The method of producing an anti-jamming global positioning system signal according to claim 16 , further comprising a ceramic radome.
18. The method of producing an anti-jamming global positioning system signal according to claim 14 , wherein the five elements have a progressive phase taper of −72° counter clockwise.