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Passive anti-jamming antenna system

Imported: 23 Feb '17 | Published: 22 Oct '02

Cordell Fox, Kevin Wing, Robert A. Murphy, David C. Priester

USPTO - Utility Patents

Abstract

System and method for improving the interference resistance of an radio frequency (RF) antenna system through passive prescreening of the RF energy incident upon the antenna. The invention physically partitions the RF environment into two or more sectors with respect to the direction of arrival of incident energy. The power level of the RF frequencies of interest incident upon each sector is determined such that whenever the power level exceeds a given threshold, the received signal from energy incident on that sector is modified.

Description

BRIEF DESCRIPTION OF THE FIGURES

The various advantages of the invention will become apparent to one skilled in the art by reading the following specification and by reference to the following drawings, which are provided by way of example and do not limit the broad application of the invention.

FIG. 1 depicts the RF environment partitioning aspect of the invention for two or more sectors.

FIG. 2 shows a block diagram of the major functional components of one embodiment of the present invention that utilizes sector-specific antenna elements.

FIG. 3A shows a top view of an antenna having hex-sided sectors in accordance with one embodiment of the invention.

FIG. 3B shows a sectional view of an antenna having hex-sided sectors in accordance with one embodiment of the invention.

FIG. 4 shows a diagram of two adjacent sectors in an interference mitigation antenna system in accordance with one embodiment of the invention.

FIG. 5 shows the interaction of an RF wave incident upon an absorber coated partition separating antenna sectors in accordance with one embodiment of the invention.

FIG. 6 shows the occurrence of total internal reflection at the boundary between an antenna partition and its absorbent layer.

FIG. 7 shows the occurrence of total internal reflection at the boundary between an antenna partition absorbent layer and the interior of a sector.

FIG. 8 shows a diagram of the geometry of an antenna array for analyzing antenna sectors' fields of view.

FIG. 9 shows a diagram of the rectangular placement of antenna units for minimal coverage by two antennas.

FIG. 10 shows additional details of the diagram shown in FIG.

8.

Claims

1. In an environment comprising at least one source of a desired signal and at least one source of undesired electromagnetic energy, an antenna system comprising:

2. The antenna system according to claim 1, further comprising:

3. The antenna system according to claim 2, wherein the characterization of the electrical signal of each communicated antenna element comprises a function of the power such electrical signal.

4. The antenna system according to claim 3, wherein the condition for modification is that the function of the power of the characterized electrical signal exceeds a threshold.

5. The antenna system according to claim 4, wherein the modification of those electrical signals for which power is greater than a threshold is attenuation.

6. The antenna system according to claim 4, wherein the modification of those electrical signals for which power is greater than a threshold is blocking.

7. The antenna system according to claim 2, further comprising,

8. The antenna system according to claim 1 further comprising at least one absorber substantially lining at least one interior wall of at least one sector.

9. The antenna system according to claim 2 further comprising at least one absorber substantially lining at least one interior wall of at least one sector.

10. The antenna system according to claim 3 further comprising at least one absorber substantially lining at least one interior wall of at least one sector.

11. The antenna system according to claim 4 further comprising at least one absorber substantially lining at least one interior wall of at least one sector.

12. The antenna system according to claim 5 further comprising at least one absorber substantially lining at least one interior wall of at least one sector.

13. The antenna system according to claim 6 further comprising at least one absorber substantially lining at least one interior wall of at least one sector.

14. The antenna system according to claim 7 further comprising at least one absorber substantially lining at least one interior wall of at least one sector.

15. The antenna system according to claim 1 further comprising an outer skin substantially covering at least one sector.

16. The antenna system according to claim 7 further comprising an outer skin substantially covering at least one sector.

17. The antenna system according to claim 15, wherein the outer skin is a bandpass filter.

18. The antenna system according to claim 1 wherein the partitioning structure comprises a plurality of hex-shaped walls.

19. In an antenna array comprising a plurality of antenna elements, a method for improving the resistance of the antenna system to interference, the method comprising:

20. The method according to claim 19, further comprising:

21. The method according to claim 20, wherein the step of modification comprises broadband attenuation of the signal from at least one antenna element that contains energy characteristic of interference.

22. The method according to claim 20, wherein the step of modification comprises blocking the electromagnetic energy from at least one antenna element that contains energy characteristic of interference.

23. The method according to claim 19, further comprising substantially coating at least one surface of a sector boundary with an absorber.