Optically coupled, array antenna
First Claim
Patent Images
1. A scannable antenna comprising:
- a first antenna array having elements with spacings s1 therebetween in an energy exchanging relationship with free space;
a space coupling region;
a second antenna array having N elements with spacings s2 therebetween in an energy coupling relationship with said space coupling region and correspondingly coupled to said elements of said first antenna array, said s2 spacing being less than said s1 spacing;
a third antenna array having M elements with spacings s3 therebetween in an energy coupling relationship with said space coupling region, said s3 spacing being greater than said s2 spacing and N being greater than M; and
means coupled to said third antenna array for establishing a preselected phase and amplitude distribution across said elements of said third array.
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Abstract
A scannable antenna having a radiating array of antenna elements correspondingly coupled, through equal line lengths, to a more closely spaced array of antenna elements positioned in a space coupling region. A feed array of antenna elements, with spacings substantially equal to the spacing in the radiating array and substantially of the same physical size as the more closely spaced array, is positioned in the space coupling region in close proximity, no more than a wave length away, to the more closely spaced array. The feed array is coupled to a distribution network which provides desired phase and amplitude aperture distributions.
50 Citations
13 Claims
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1. A scannable antenna comprising:
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a first antenna array having elements with spacings s1 therebetween in an energy exchanging relationship with free space; a space coupling region; a second antenna array having N elements with spacings s2 therebetween in an energy coupling relationship with said space coupling region and correspondingly coupled to said elements of said first antenna array, said s2 spacing being less than said s1 spacing; a third antenna array having M elements with spacings s3 therebetween in an energy coupling relationship with said space coupling region, said s3 spacing being greater than said s2 spacing and N being greater than M; and means coupled to said third antenna array for establishing a preselected phase and amplitude distribution across said elements of said third array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification