Electronically steered, dual-polarized, dual-plane, monopulse antenna feed
First Claim
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1. A method for electronically steering a polarized monopulse RADAR beam across an array of RADAR feed horn pairs in a planar direction defined by at least three co-planar, similarly polarized, diagonal feed horns, the method comprising:
- activating the first and second feed horns as a first feed horn pair in the feed horn array, wherein the first and second feed horns are mutually adjacent, to produce a RADAR beam from the phase center of the first feed horn pair;
de-activating the first feed horn; and
activating the third feed horn in the feed horn array to create a second feed horn pair including the second and third feed horns, wherein the third feed horn is adjacent to the second feed horn, said activating the second feed horn pair moving the phase center of the RADAR beam emitted from the feed horn array from the phase center of the first feed horn pair to the phase center of the second feed horn pair.
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Abstract
A method and apparatus for electronically steering a RADAR beam across an array of feed horns by moving the phase center of the beam to different origination points on the array—each origination point being the phase center of a feed horn pair. Variations include polarized beams, polarized feed horns, dual-beam systems, dual direction steering, diagonal steering, and cross-polarized wire grids to control beamwidth.
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Citations
43 Claims
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1. A method for electronically steering a polarized monopulse RADAR beam across an array of RADAR feed horn pairs in a planar direction defined by at least three co-planar, similarly polarized, diagonal feed horns, the method comprising:
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activating the first and second feed horns as a first feed horn pair in the feed horn array, wherein the first and second feed horns are mutually adjacent, to produce a RADAR beam from the phase center of the first feed horn pair; de-activating the first feed horn; and activating the third feed horn in the feed horn array to create a second feed horn pair including the second and third feed horns, wherein the third feed horn is adjacent to the second feed horn, said activating the second feed horn pair moving the phase center of the RADAR beam emitted from the feed horn array from the phase center of the first feed horn pair to the phase center of the second feed horn pair. - View Dependent Claims (3, 5)
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2. A method for electronically steering a polarized monopulse RADAR beam across an array of RADAR feed horns in a planar direction defined by at least two co-planar, similarly polarized, stacked feed horn pairs, the method comprising:
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activating the first feed horn pair, the first feed horn pair comprising a first and a second feed horn in the feed horn array, wherein the first and second feed horns are mutually adjacent, stacked orthogonal to the planar direction, and similarly polarized, to produce a RADAR beam from the phase center of the first feed horn pair; de-activating the first feed horn pair; and activating the second feed horn pair, the second feed horn pair comprising a third and a fourth feed horn in the feed horn array, wherein the third and fourth feed horns are mutually adjacent, stacked orthogonal to the planar direction, and similarly polarized, and further wherein the second feed horn pair is adjacent and similarly polarized to the first feed horn pair, and wherein the second feed horn pair is co-planar to the first feed horn pair in the planar direction, said activating the second feed horn pair moving the phase center of the RADAR beam emitted from the feed horn array from the phase center of the first feed horn pair to the phase center of the second feed horn pair. - View Dependent Claims (4, 6)
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7. A method of dual-plane electronic beam steering of a polarized monopulse RADAR beam across an array of RADAR feed horns in two planar directions, wherein the first planar direction is a planar direction defined by at least three co-planar, similarly polarized, feed horns and the second planar direction is orthogonal to the first planar direction, the method comprising:
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first planar direction steering by; activating the first and second feeds horn as a first feed horn pair in the feed horn array, wherein the first and second feed horns are mutually adjacent, co-planar in the first planar direction, and similarly polarized, to produce the first polarized RADAR beam from the phase center of the first horn pair; de-activating said first feed horn; and activating a third polarized feed horn in the feed horn array to create a second feed horn pair including the second and third feed horns, wherein the third feed horn is adjacent to the second feed horn and co-planar and similarly polarized with respect to the first and second feed horns, said activating the second feed horn pair steering the polarized RADAR beam in the first planar direction by moving the phase center of the polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the second horn pair; second planar direction steering by; activating said first feed horn pair; de-activating said first feed horn pair; and activating a third horn pair comprising a third and a fourth feed horn in the feed horn array, wherein the third and fourth feed horns are mutually adjacent and co-planar in first planar direction, and polarized similarly to the first and second feed horns, and wherein the first horn pair is adjacent and co-planar to the third horn pair in the second planar direction, said activating the third horn pair steering the polarized RADAR beam in the second planar direction by moving the phase center of the polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the third horn pair. - View Dependent Claims (8, 9, 10)
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11. A method of electronically steering of a first polarized monopulse RADAR beam and a second polarized monopulse RADAR beam across an array of RADAR feed horns in a planar direction, where the first and second beam polarizations are orthogonal, the method comprising:
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first beam steering by; activating a first and a second feed horn as a first feed horn pair in the feed horn array, wherein the first and second feed horns are mutually adjacent, co-planar in the first planar direction, and polarized in the first polarization;
to produce the first polarized RADAR beam from the phase center of the first horn pair;de-activating said first feed horn; and activating a third feed horn in the feed horn array to create a second feed horn pair including the second and third feed horns, wherein the third feed horn is adjacent to the second feed horn and co-planar and similarly polarized with respect to the first and second feed horns, said activating a third feed horn steering the first polarized RADAR beam by moving the phase center of the first polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the second horn pair; second beam steering by; activating a fourth and a fifth feed horn as a third feed horn pair in the feed horn array, wherein the fourth and fifth feed horns are mutually adjacent, co-planar in a direction orthogonal to the planar direction, and polarized in the second polarization, to produce the second polarized RADAR beam from the phase center of the third horn pair; de-activating said third feed horn pair; and activating a fourth horn pair comprising a sixth and a seventh feed horn in the feed horn array, wherein the sixth and seventh feed horns are mutually adjacent and co-planar a direction orthogonal to the planar direction, and polarized in the second polarization, and wherein the third horn pair is adjacent and co-planar to the fourth horn pair in the planar direction, said activating a fourth horn pair steering the second polarized RADAR beam by moving the phase center of the second polarized RADAR beam emitted from the feed horn array from the phase center of the third horn pair to the phase center of the fourth horn pair. - View Dependent Claims (12, 13)
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14. A method of dual-plane electronic beam steering of a first polarized monopulse RADAR beam and a second polarized monopulse RADAR beam across an array of RADAR feed horns in two orthogonal planar directions, wherein the first planar direction corresponds to the first beam polarization direction and the second planar direction corresponds to the second beam polarization direction and wherein the beam polarization directions are also orthogonal, the method comprising:
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first beam first planar direction steering by; activating a first and a second feed horn as a first feed horn pair in the feed horn array, wherein the first and second feed horns are mutually adjacent, co-planar in the first planar direction, and polarized in the first polarization direction, to produce the first polarized RADAR beam from the phase center of the first horn pair; de-activating said first feed horn; and activating a third feed horn in the feed horn array to create a second feed horn pair, wherein the third feed horn is adjacent to the second feed horn and co-planar and similarly polarized with respect to the first and second feed horns, said activating a first and a second feed horn steering the first polarized RADAR beam in the first planar direction by moving the phase center of the first polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the second horn pair; first beam second planar direction steering by; activating said first feed horn pair; de-activating said first feed horn pair; and activating a third horn pair comprising a fourth and a fifth feed horn in the feed horn array, wherein the fourth and fifth feed horns are mutually adjacent and co-planar in first planar direction, and polarized in the first polarization direction, and wherein the first horn pair is adjacent and co-planar to the third horn pair in the second planar direction, said activating a third horn pair steering the first polarized RADAR beam in the second planar direction by moving the phase center of the first polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the third horn pair; second beam second planar direction steering by; activating a sixth and a seventh feed horn as a fourth feed horn pair in the feed horn array, wherein the sixth and seventh feed horns are mutually adjacent, co-planar in the second planar direction, and polarized in the second polarization direction, to produce the second polarized RADAR beam from the phase center of the fourth horn pair; de-activating said fifth feed horn; and activating an eighth feed horn in the feed horn array to create a fifth feed horn pair, wherein the eighth feed horn is adjacent to the seventh feed horn and co-planar and similarly polarized with respect to the sixth and seventh feed horns, said activating an eighth feed horn steering the second polarized RADAR beam in the second planar direction by moving the phase center of the second polarized RADAR beam emitted from the feed horn array from the phase center of the fourth horn pair to the phase center of the fifth horn pair; second beam first planar direction steering by; activating said fourth feed horn pair; de-activating said fourth feed horn pair; and activating a sixth horn pair comprising a ninth and a tenth feed horn in the feed horn array, wherein the ninth and tenth feed horns are mutually adjacent and co-planar in second planar direction, and polarized in the second polarization direction, and wherein the fourth horn pair is adjacent and co-planar to the sixth horn pair in the first planar direction, said activating a sixth horn pair steering the second polarized RADAR beam in the first planar direction by moving the phase center of the second polarized RADAR beam emitted from the feed horn array from the phase center of the fourth horn pair to the phase center of the sixth horn pair. - View Dependent Claims (15, 16, 17)
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18. An apparatus for electronically steering a polarized monopulse RADAR beam across an array of RADAR feed horn pairs in a planar direction defined by at least three co-planar, similarly polarized feed horns, the apparatus comprising:
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a radio-frequency (RF) comparator; a first feed horn pair including a first feed horn and a second feed horn, wherein the first and second feed horns are mutually adjacent, co-planar in the planar direction, and similarly polarized, and wherein the first feed horn pair produces a RADAR beam from its phase center when both of its feed horns are activated; a second feed horn pair including a third feed horn and the second feed horn, wherein the third feed horn is adjacent to the second feed horn and co-planar and similarly polarized with respect to the first and second feed horns, and wherein the second feed horn pair produces a RADAR beam from its phase center when both of its feed horns are activated; a switching device that selectively activates and deactivates the first and third feed horns and connects and disconnects the feed horns to and from the RF comparator, such that when the first feed horn is activated, the third feed horn is inactive and vice-versa, and when the first feed horn is connected to the RF comparator the third feed horn is disconnected from the RF comparator and vice-versa; wherein the selective activation of the first and third feed horns steers the polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs by moving the phase center of the polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the second horn pair. - View Dependent Claims (19, 20, 21)
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22. An apparatus for electronically steering a polarized monopulse RADAR beam across an array of RADAR feed horns in a planar direction defined by at least two co-planar, similarly polarized, stacked feed horn pairs, the apparatus comprising:
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A radio-frequency (RF) comparator; a first feed horn pair comprising a first and a second feed horn in the feed horn array, wherein the first and second feed horns are mutually adjacent, co-planar in a plane orthogonal to the planar direction, and similarly polarized, and wherein the first feed horn pair produces a polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a second feed horn pair comprising a third and a fourth feed horn in the feed horn array, wherein the third and fourth feed horns are mutually adjacent, co-planar to each-other in a plane orthogonal to the planar direction, and similarly polarized to the first and second feed horns, wherein the second feed horn pair is adjacent to the first feed horn pair and co-planar to the first feed horn pair in the planar direction, and wherein the second feed horn pair produces a polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a switching device that selectively activates and de-activate the first and second feed horn pairs and connect and disconnect the feed horns of each feed horn pair to and from the RF comparator, such that when the first feed horn pair is activated and connected to the RF comparator, the second feed horn pair is inactive and disconnected from the RF comparator, and vice-versa; wherein the selective activation of the first and second feed horn pairs steers the polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs by moving the phase center of the polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the second horn pair. - View Dependent Claims (23, 24, 25)
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26. An apparatus for dual-plane electronic beam steering of a polarized monopulse RADAR beam across an array of RADAR feed horns in two planar directions, wherein the first planar direction is a planar direction defined by at least three co-planar, similarly polarized feed horns and the second planar direction is orthogonal to the first planar direction, the apparatus comprising:
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a radio-frequency (RF) comparator; a first feed horn pair including a first feed horn and a second feed horn, wherein the first and second feed horns are mutually adjacent, co-planar in the first planar direction, and similarly polarized, and wherein the first feed horn pair produces a polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a second feed horn pair including a third feed horn and the second feed horn, wherein the third feed horn is adjacent to the second feed horn and co-planar and similarly polarized with respect to the first and second feed horns, and wherein the second feed horn pair produces a polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a third feed horn pair comprising a fifth and a fourth feed horn in the feed horn array, wherein the fifth and fourth feed horns are mutually adjacent, co-planar in the first planar direction, and similarly polarized with respect to the first, second and third feed horns, and further wherein the third feed horn pair is adjacent and similarly polarized to the first feed horn pair and co-planar to the first feed horn pair in the second planar direction, and wherein the third feed horn pair produces a polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a first switching device that selectively activates and de-activates the first and third feed horn pairs and connects and disconnect the feed horns of the first and third feed horn pair to and from the RF comparator, such that when the first feed horn pair is activated and connected to the RF comparator, the third feed horn pair is inactive and disconnected from the RF comparator, and vice-versa, wherein the selective activation of the first and third feed horn pairs steers the polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs in the second planar direction by moving the phase center of the polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to thee phase center of the third horn pair; a second switching device that selectively activates and deactivates the first and third feed horns and connects and disconnects the first and third feed horns to and from the RF comparator, such that when the first feed horn is activated, the third feed horn is inactive and vice-versa, and when the first feed horn is connected to the RF comparator the third feed horn is disconnected from the RF comparator and vice-versa, wherein the selective activation of the first and third feed horns steers the polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs in the first planar direction by moving the phase center of the polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the second horn pair; and a third switching device that manages the connection and activation of feed horns such that only one feed horn pair is allowed to be active and connected to the comparator during RADAR beam emission. - View Dependent Claims (27, 28, 29)
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30. An apparatus for dual-plane electronic beam steering of a first polarized monopulse RADAR beam and a second polarized monopulse RADAR beam across an array of RADAR feed horns in two orthogonal planar directions, wherein the first planar direction corresponds to the first beam polarization and the second planar direction corresponds to the second beam polarization and wherein the beam polarizations are also orthogonal, the apparatus comprising:
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a first radio-frequency (RF) comparator; a second RF comparator; a first feed horn pair including a first feed horn and a second feed horn, wherein the first and second feed horns are mutually adjacent, co-planar in the first planar direction, and first polarized, and wherein the first feed horn pair produces a first polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a second feed horn pair including a third feed horn and the second feed horn, wherein the third feed horn is adjacent to the second feed horn, first polarized, and co-planar with respect to the first and second feed horns, and wherein the second feed horn pair produces a first polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a third feed horn pair comprising a fifth and a fourth feed horn in the feed horn array, wherein the fifth and fourth feed horns are mutually adjacent, co-planar in the first planar direction, and first polarized, and further wherein the third feed horn pair is adjacent and co-planar to the first feed horn pair in the second planar direction, and wherein the third feed horn pair produces a first polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a fourth feed horn pair including a sixth feed horn and a seventh feed horn, wherein the sixth and seventh feed horns are mutually adjacent, co-planar in the second planar direction, and second polarized, and wherein the fourth feed horn pair produces a second polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a fifth feed horn pair including an eighth feed horn and the seventh feed horn, wherein the eighth feed horn is adjacent to the seventh feed horn, second polarized, and co-planar with respect to the sixth and seventh feed horns, and wherein the fifth feed horn pair produces a second polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a sixth feed horn pair comprising a ninth and a tenth feed horn in the feed horn array, wherein the ninth and tenth feed horns are mutually adjacent, co-planar in the second planar direction, and second polarized, and further wherein the sixth feed horn pair is adjacent and co-planar to the fourth feed horn pair in the first planar direction, and wherein the sixth feed horn pair produces a second polarized monopulse RADAR beam from its phase center when both of its feed horns are activated; a first switching device that selectively activates and de-activates the first and third feed horn pairs and connects and disconnect the feed horns of the first and third feed horn pair to and from the first RF comparator, such that when the first feed horn pair is activated and connected to the first RF comparator, the third feed horn pair is inactive and disconnected from the first RF comparator, and vice-versa, wherein the selective activation of the first and third feed horn pairs steers the first polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs in the second planar direction by moving the phase center of the first polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the third horn pair; a second switching device that selectively activates and deactivates the first and third feed horns and connects and disconnects the first and third feed horns to and from the first RF comparator, such that when the first feed horn is activated, the third feed horn is inactive and vice-versa, and when the first feed horn is connected to the first RF comparator the third feed horn is disconnected from the first RF comparator and vice-versa, wherein the selective activation of the first and third feed horns steers the first polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs in the first planar direction by moving the phase center of the first polarized RADAR beam emitted from the feed horn array from the phase center of the first horn pair to the phase center of the second horn pair; a third switching device that selectively activates and de-activates the fourth and sixth feed horn pairs and connects and disconnect the feed horns of the fourth and sixth feed horn pair to and from the second RF comparator, such that when the fourth feed horn pair is activated and connected to the second RF comparator, the sixth feed horn pair is inactive and disconnected from the second RF comparator, and vice-versa, wherein the selective activation of the fourth and sixth feed horn pairs steers the second polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs in the first planar direction by moving the phase center of the second polarized RADAR beam emitted from the feed horn array from the phase center of the fourth horn pair to the phase center of the sixth horn pair; a fourth switching device that selectively activates and deactivates the sixth and eighth feed horns and connects and disconnects the sixth and eighth feed horns to and from the second RF comparator, such that when the sixth feed horn is activated, the eighth feed horn is inactive and vice-versa, and when the sixth feed horn is connected to the second RF comparator the eighth feed horn is disconnected from the second RF comparator and vice-versa, wherein the selective activation of the sixth and eighth feed horns steers the second polarized monopulse RADAR beam emitted from the array of RADAR feed horn pairs in the second planar direction by moving the phase center of the second polarized RADAR beam emitted from the feed horn array from the phase center of the fourth horn pair to the phase center of the horn pair; a fifth switching device that manages the connection and activation of the first, second, and third feed horn pairs to the first RF comparator such that only one feed horn pair is allowed to be active and connected to the first RF comparator during first polarized monopulse RADAR beam emission; and a sixth switching device that manages the connection and activation of the fourth, fifth, and sixth feed horn pairs to the second RF comparator such that only one feed horn pair is allowed to be active and connected to the second RF comparator during second polarized monopulse RADAR beam emission. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification