Two terminal antenna for adaptive arrays
First Claim
1. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
- at least one antenna array means which includes at least two dipole element means; and
phase shifter means coupled to recieve the output signal of the first terminal of the antenna array means for changing the phase of the output signal;
where the output terminal of the phase shifter means and the second terminal of the antenna array means are each disposed to be coupled to different input terminals of the adaptive array such that direction of arrival phase information is retained;
the said adaptive array means having a number of input terminal pairs that correspond to the number of antenna array means.
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Abstract
A single two terminal antenna, such as a dipole antenna, is used to supply the input signals for a two element adaptive array. This reduces the number of antennas required by the adaptive array to reject an inteference signal from two to one. The antenna is connected so that the phase information reflecting the direction of arrival of a received signal is preserved. The resulting single antenna adaptive array functions like a two element adaptive array. When the two terminal antenna is not located at the adaptive array, two transmission lines are required to carry the output signals of the antenna. In a similar manner, an N input adaptive array (where N is an even number) can use N/2 two terminal antennas to reject N-1 interference signals.
32 Citations
30 Claims
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1. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
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at least one antenna array means which includes at least two dipole element means; and phase shifter means coupled to recieve the output signal of the first terminal of the antenna array means for changing the phase of the output signal; where the output terminal of the phase shifter means and the second terminal of the antenna array means are each disposed to be coupled to different input terminals of the adaptive array such that direction of arrival phase information is retained; the said adaptive array means having a number of input terminal pairs that correspond to the number of antenna array means. - View Dependent Claims (2, 3, 4)
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5. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
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at least one dipole antenna means; and 180 degree phase shifter means coupled to receive the output signal of the first terminal of the dipole antenna means for changing the sign of the output signal; where the output terminal of the 180 degree phase shifter means and the second terminal of the dipole antenna means are each disposed to be coupled to different input terminals of the adaptive array means such that direction of arrival phase information is retained; the said adaptive array means having a number of input terminal pairs that correspond to the number of dipole antenna means. - View Dependent Claims (6, 7, 8)
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9. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
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at least one folded dipole antenna means; and phase shifter means coupled to receive the output signal of the first terminal of the folded dipole antenna means for changing the phase of the output signal; where the output terminal of the phase shifter means and the second terminal of the folded dipole antenna means are each disposed to be coupled to different input terminals of the adaptive array means such that direction of arrival phase information is retained; the said adaptive array means having a number of input terminal pairs that correspond to the number of folded dipole antenna means. - View Dependent Claims (10, 11, 12)
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13. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
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at least one Yagi antenna means; and phase shifter means coupled to receive the output signal of the first terminal of the Yagi antenna means for changing the phase of the output signal; where the output terminal of the phase shifter means and the second terminal of the Yagi antenna means are each disposed to be coupled to different input terminals of the adaptive array means such that direction of arrival phase information is retained; the said adaptive array means having a number of input terminal pairs that correspond to the number of Yagi antenna means. - View Dependent Claims (14, 15, 16)
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17. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
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at least one log periodic antenna means; and phase shifter means coupled to receive the output signal of the first terminal of the log periodic antenna means for changing the phase of the output signal; where the output terminal of the phase shifter means and the second terminal of the log periodic antenna means are each disposed to be coupled to different input terminals of the adaptive array means such that direction of arrival phase information is retained; the said adaptive array means having a number of input terminal pairs that correspond to the number of log periodic antenna means. - View Dependent Claims (18, 19, 20)
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21. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
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at least one dipole antenna means; where the output terminals of the dipole antenna means are each disposed to be coupled to different input terminals of the adaptive array means such that direction of arrival phase information is retained; the said adaptive array means having a number of input terminal pairs that correspond to the number of dipole antenna means and having each input terminal signal processed by four loops means having time/phase delays means equivalent to 0, 90, 180, and 270 degrees respectively. - View Dependent Claims (22, 23, 24)
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25. An antenna system for reducing by one half the number of antennas required by an adaptive array means to reject interference signals, said system comprising:
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at least one loop antenna means; and a phase shifter means coupled to receive the output signal of the first terminal of the loop antenna means for changing the sign of the output signal; where the output terminal of the phase shifter means and the second terminal of the loop antenna means are each disposed to be coupled to different input terminals of the adaptive array means such that direction of arrival phase information is retained; the said adaptive array means having a number of input terminal pairs that correspond to the number of loop antenna means.
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26. An antenna system for reducing by one half the number of antennas required by a phase-stable adaptive array means to reduce interference signals, said system comprising:
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at least one antenna array means which includes at least two dipole element means; where the output signals of the terminals of the antenna array means are each disposed to be coupled to different input terminals of the phase-stable adaptive array means such that direction of arrival phase information is retained; the said phase-stable adaptive array means having a number of input terminal pairs that correspond to the number of antenna array means.
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27. An antenna system for reducing by one half the number of antennas required by a phase-stable adaptive array means to reduce interference signals, said system comprising:
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at least one dipole antenna means;
where the output signals of the terminals of the dipole antenna means are each disposed to be coupled to different input terminals of the phase-stable adaptive array means such that direction of arrival phase information is retained;the said phase-stable adaptive array means having a number of input terminal pairs that correspond to the number of dipole antenna means.
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28. An antenna system for reducing by one half the number of antennas required by a phase-stable adaptive array means to reduce interference signals, said system comprising:
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at least one folded dipole antenna means;
where the output signals of the terminals of the folded dipole antenna means are each disposed to be coupled to different input terminals of the phase-stable adaptive array means such that direction of arrival phase information is retained;the said phase-stable adaptive array means having a number of input terminal pairs that correspond to the number of folded dipole antenna means.
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29. An antenna system for reducing by one half the number of antennas required by a phase-stable adaptive array means to reduce interference signals, said system comprising:
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at least one Yagi antenna means; where the output signals of the terminals of the Yagi antenna means are each disposed to be coupled to different input terminals of the phase-stable adaptive array means such that direction of arrival phase information is retained; the said phase-stable adaptive array means having a number of input terminal pairs that correspond to the number of Yagi antenna means.
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30. An antenna system for reducing by one half the number of antennas required by a phase-stable adaptive array means to reduce interference signals, said system comprising:
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at least one log-periodic antenna means;
where the output signals of the terminals of the log-periodic antenna means are each disposed to be coupled to different input terminals of the phase-stable adaptive array means such that direction of arrival phase information is retained;the said phase-stable adaptive array means having a number of input terminal pairs that correspond to the number of log-periodic antenna means.
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Specification