Space/angle diversity configurations for cellular antennas
First Claim
1. A cellular antenna system, providing onmidirectional coverage with improved space/angle diversity, comprising:
- a support structure to position antennas at four successive laterally separated locations (locations I, II, III and IV) spaced around a vertically extending axis, said locations being at non-adjacent positions with lateral separations selected to provide space diversity operation;
eight antennas, including mounted at each said location a pair of antennas pointing in nominally orthogonal directions, and for each said pair an antenna at a different said location with a pointing direction between said orthogonal directions;
the pointing direction of each of said eight antennas differing nominally by an integral multiple of 45 degrees from the pointing direction of each other said antenna.
3 Assignments
0 Petitions
Accused Products
Abstract
Performance of multibeam cellular antenna systems is improved by use of space diversity in antenna placement and angle diversity in antenna alignment. Space/angle diversity is achieved on a single tower structure (20) by placement of eight antennas (B1-B8) in pairs at four spaced locations (I, II, III, IV) at the tower corners. Antennas are placed with an orthogonally directed pair at each location. For each orthogonal pair (e.g., B1 and B2 at location I) there is an antenna located at a different corner which is pointed between the orthogonal directions (e.g., B5 at location II). Antenna placement and alignment for achieving space/angle diversity in triangular tower configurations are also described.
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Citations
17 Claims
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1. A cellular antenna system, providing onmidirectional coverage with improved space/angle diversity, comprising:
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a support structure to position antennas at four successive laterally separated locations (locations I, II, III and IV) spaced around a vertically extending axis, said locations being at non-adjacent positions with lateral separations selected to provide space diversity operation; eight antennas, including mounted at each said location a pair of antennas pointing in nominally orthogonal directions, and for each said pair an antenna at a different said location with a pointing direction between said orthogonal directions; the pointing direction of each of said eight antennas differing nominally by an integral multiple of 45 degrees from the pointing direction of each other said antenna. - View Dependent Claims (2, 3)
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4. A cellular antenna system, providing omnidirectional coverage with improved space/angle diversity, comprising:
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a support structure to position antennas at successive laterally separated locations spaced around a vertically extending axis, said locations being at non-adjacent positions with lateral separations selected to provide space diversity operation; and a plurality of N antennas, including mounted at each said location a pair of antennas respectively pointing in two different directions separated by an angle, and for each said pair an antenna at a different said location with a pointing direction nominally bisecting said angle; said angle nominally equal to 360 degrees divided by one-half N.
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5. A cellular antenna system, providing omnidirectional coverage with improved space/angle diversity, comprising:
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a support structure to position antennas at successive laterally separated locations spaced around a vertically extending axis, said locations being at non-adjacent positions with lateral separations selected to provide space diversity operation; and a plurality of N antennas, including two antennas mounted at each said location, with the pointing direction of each antenna differing nominally from the pointing direction of each other antenna by an integral multiple of 360 degrees divided by N; the antennas arranged so that for each pair of antennas respectively pointing in directions separated by an angle nominally equal to 360 degrees divided by one-half N, there is an antenna at a location different from the location of each antenna of said pair having a pointing direction nominally bisecting said angle. - View Dependent Claims (6, 7)
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8. A cellular antenna system, providing omnidirectional coverage with improved space/angle diversity, comprising:
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a support structure to position antennas at four successive laterally separated locations (locations I, II, III and IV) spaced around a vertically extending axis, said support structure being one of rectangular and triangular in cross section and at least three of said locations being adjacent to corners of the support structure; and eight antennas, including mounted at each said location a pair of antennas pointing in nominally orthogonal directions, and for each said pair an antenna at a different said location with a pointing direction between said orthogonal directions; the pointing direction of each of said eight antennas differing nominally by an integral multiple of 45 degrees from the pointing direction of each other said antenna. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A cellular antenna system, providing omnidirectional coverage with improved space/angle diversity, comprising:
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a support structure to position antennas at successive laterally separated locations spaced around a vertically extending axis, said support structure being one of rectangular and triangular in cross section and at least three of said locations being adjacent to corners of the support structure; and a plurality of N antennas, including two antennas mounted at each said location, with the pointing direction of each antenna differing nominally from the pointing direction of each other antenna by an integral multiple of 360 degrees divided by N; the antennas arranged so that for each pair of antennas respectively pointing in directions separated by an angle nominally equal to 360 degrees divided by one-half N, there is an antenna at a location different from the location of each antenna of said pair having a pointing direction nominally bisecting said angle. - View Dependent Claims (16, 17)
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Specification