Methods and Apparatus for Generating Beam Pattern with Wider Beam Width in Phased Antenna Array
First Claim
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1. A method, comprising:
- transmitting or receiving a radio signal over a directional beam using a phased antenna array having N antenna elements in a beamforming cellular network, wherein adjacent antenna elements have a distance of d, wherein N is a positive integer;
applying a plurality of phase shift values to the plurality of antenna elements, wherein each antenna element is applied with a phase shift value having a combined beam coefficient, and wherein each combined beam coefficient comprises a beam steering coefficient plus a beam expansion coefficient; and
steering a direction of the directional beam and shaping a beamwidth of the directional beam by controlling the combined beam coefficients by a processor.
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Abstract
A method of steering beam direction and shaping beamwidth of a directional beam using a phased antenna array in a beamforming cellular system is proposed. The N antenna elements of the phased antenna array are applied with a set of combined beam coefficients to steer the direction of the beam and to shape the beamwidth to a desired width. Specifically, in addition to the original constant phase shift values, additional phase modulations are applied to expand the beam to a desirable width. The phased antenna array applied with the combined beam coefficients involve only phase shift, no amplitude modulation is needed and thereby increasing beamforming gain and efficiency.
39 Citations
20 Claims
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1. A method, comprising:
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transmitting or receiving a radio signal over a directional beam using a phased antenna array having N antenna elements in a beamforming cellular network, wherein adjacent antenna elements have a distance of d, wherein N is a positive integer; applying a plurality of phase shift values to the plurality of antenna elements, wherein each antenna element is applied with a phase shift value having a combined beam coefficient, and wherein each combined beam coefficient comprises a beam steering coefficient plus a beam expansion coefficient; and steering a direction of the directional beam and shaping a beamwidth of the directional beam by controlling the combined beam coefficients by a processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless device, comprising:
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a phased antenna array having N antenna elements that transmits or receives a radio signal over a directional beam in a beamforming cellular network, wherein adjacent antenna elements have a distance of d, wherein N is a positive integer; a plurality of phase shifters coupled to the plurality of antenna elements, wherein each antenna element is applied with a phase shift having a combined beam coefficient, and wherein each combined beam coefficient comprises a beam steering coefficient plus a beam expansion coefficient; and a processor that controls the combined beam coefficients to steer a direction and to shape a beamwidth of the directional beam. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification