Beam scanning antennas with plurality of antenna elements for scanning beam direction
AssigneeKabushiki Kaisha Toshiba
InventorHiroki Shoki
Life of this patent
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Abstract
An array antenna is formed of a plurality of antenna elements, each of which scans a beam in the direction of an angle θ to a boresight of the antenna and electrically varies the direction of a rotation angle φ of the beam. The antenna elements are disposed so that the optical path difference of radio waves transmitted or received by two adjacent antenna elements in the directions of a plurality of direction angles φ on the plane tilted for an angle θ to the boresight of the antenna is nearly a multiple of the wave length of the radio waves.
Claims11
An array antenna comprising:
- a circular antenna array constructed of a number i of antenna elements disposed on a periphery of a circle at respective position angles ψi relative to a radial axis of the circle;
- and
- phase shifting means for giving a respective phase shift αi to radiation directivity of each of said antenna elements and for making the phase shift αi equal to n times the position angle ψi, n being an integer excluding 0,
- wherein said phase shifting means comprises a rotating antenna element and said rotating antenna element comprises said antenna elements, each of which rotates for an angle αi.
An array antenna comprising:
- number k of circular antenna arrays constructed of a number of i of antenna elements disposed on any periphery of concentric circles having radii different from each other and disposed at respective position angles ψk−i relative to a radial axis of the circle;
- and
- phase shifting means for giving a phase shift αk−i to radiation directivity of each of said antenna elements disposed on the same periphery and for making the phase shift αk−i equal to nk times position angle ψk−i, nk being an integer excluding 0,
- wherein said integers nk are different from each other.
An array antenna comprising:
- number k of circular antenna arrays constructed of a number of i of antenna elements disposed on any periphery of concentric circles having radii different from each other and disposed at respective position angles ψk−i relative to a radial axis of the circle;
- and
- phase shifting means for giving a phase shift αk−i to radiation directivity of each of said antenna elements disposed on the same periphery and for making the phase shift αk−i equal to nk times position angle ψk−i, nk being an integer excluding 0,
- wherein the array antenna further comprises an RF switch for selecting a circular antenna array.
An array antenna comprising:
- number k of circular antenna arrays, constructed of a number i of antenna elements disposed on any periphery of concentric circles having radii different from each other and disposed at respective position angles ψk−i relative to a radial axis of the circle;
- and
- phase shifting means for giving a phase shift αk−i to radiation directivity of each of said antenna elements disposed on the same periphery and for making the phase shift αk−i equal to nk times position angle ψk−i, nk being an integer excluding 0,
- wherein said phase shifting means corresponding to each of said circular antenna arrays are electrically connected to feeding circuits being different from each other.
Dependencies are inferred from the claim text.