Beam-forming method for forming array antenna of variable beam

Abstract

The invention discloses a beam-forming method for forming an array antenna of a variable beam, which comprises the following steps of: (1) dividing a target beam into fixed beams and movable beams in shape according to the requirement of the target beam; (2) dividing all array elements of an array into n sub-arrays according to the number of the fixed beams and the number of the movable beams; (3) obtaining gain directional diagrams to be implemented by the sub-arrays by optimizing the layout of the sub-arrays and all unit amplitude phases in the sub-arrays under the environment of the whole arrays; (4) calculating phase directional diagrams of the respective sub-arrays, namely functions of phases varying along an angle of pitch Theta and an azimuth angle, under the environment of the whole arrays, and normalizing the phase directional diagrams of the respective sub-arrays to make the respective sub-arrays same-phase in pointing angles of the movable beams; and (5) determining weights of the respective sub-arrays according to a gain value of the target beam and the gain values of the respective sub-arrays obtained in the step (3), performing linear synthesis on the gain directional diagrams of the all sub-arrays by using the weights, and adjusting the weights of the respective sub-arrays to achieve an effect of forming as required.

Description

technical field [0001] The invention belongs to the field of microwave communication, and relates to a shaped variable beam array antenna, in particular to a simple and practical shaped variable beam array antenna. Background technique [0002] The beam coverage diagram of a certain type of task requirements antenna is as follows: figure 1 As shown, the shaded area in the center of the figure is a sharp beam and is movable in the blue area, and the oblique area is a fixed shaped beam, which has a shaping effect in a certain beam range; and the gain of the red area is higher than that of the blue area gain. figure 2 For the ideal beam section curve, a shoulder-shaped beam is formed, the shoulder of the beam is basically unchanged, and the beam above the shoulder needs to be movable. [0003] Compared with the reflector antenna, the array antenna has a variety of formation and feeding methods, and the beam control is flexible, so it has been widely used and developed rapidl...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the traditional array antenna can form a fixed shaped beam, or form a fixed beam scanning, it is difficult to achieve the shaped variable beam required by the model task

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