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US 5,345,246 AGranted
Antenna device having low side-lobe characteristics
AssigneeNational Space Development Agency of Japan
InventorToshihiro Sezai
Life of this patent
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Abstract
There is disclosed an antenna device having low side-lobe characteristics comprising a pair of array antennas having the same construction. Each array antenna has array elements equidistantly arranged. The center-to-center distance between the array antennas is so determined that the angle of the first zero point of the array factor determined by the center-to-center distance equals the angle of the first side lobe point of the pattern of each array antenna. The array antennas are electrically connected so as to become excited in phase.
Claims6
An antenna device having low side-lobe characteristics, comprising:
- a first array antenna having a center and a radiation pattern which has a first side lobe point at a first angle;
- a second array antenna which is substantially identical to said first array antenna, said second array antenna having a center and a radiation pattern which has a first side lobe point at a first angle;
- said first array antenna and said second array antenna each being oriented in a same direction so as to form a combined antenna pattern having a side lobe during operation, and said center of said first array antenna being spaced apart from said center of said second array antenna by a specified center-to-center distance, such that said first array antenna and said second array antenna together have an array factor which has a first zero point at a predetermined angle;
- wherein said specified center-to-center distance having a magnitude which causes said angle of said first zero point of said array factor to equal said angle of said first side lobe point of said radiation pattern of each of said first and second array antennas;
- and
- means for electrically connecting said first and second array antennas in phase,
- whereby a side lobe level of said side lobe of said combined antenna pattern is reduced.
4 more elements
Dependencies are inferred from the claim text.