Aperiodic array antenna design method

Abstract

The invention provides an aperiodic array antenna design method. The method comprises the steps as follows: establishing an element model group of aperiodic array antenna, wherein the element model group comprises at least two antenna element models, and the distances between each antenna element model and other antenna element models adjacent to the antenna element model are different, and the directional diagram and the active voltage standing wave ratio of the antenna element model can meet design demands; establishing an initial aperiodic array antenna model, wherein the initial aperiodic array antenna model comprises at least three antenna elements; conducting the comprehensive optimization on the initial aperiodic array antenna model according to the optimization algorithm, updating the aperiodic array antenna model according to the result of optimization, updating antenna elements by using the antenna element models, and carrying out full wave analysis and process on the initial aperiodic array antenna model in sequence; when the error between a directional diagram obtained according to the optimization algorithm and a directional diagram obtained according to full wave analysis during once circular treating process is not larger than a preset threshold value, the design result of the aperiodic array antenna is obtained.

Description

technical field [0001] The present invention relates to communication technology, in particular to a method for designing an aperiodic array antenna. Background technique [0002] The comprehensive design of the array antenna can usually be realized by three methods, which are changing the excitation amplitude of the array elements, changing the excitation phase of the array elements and changing the spacing between the array elements. However, for the unequal-amplitude array design method that changes the excitation amplitude of the array unit, there will usually be a larger amplitude excitation ratio, and the use of unequal-amplitude excitation will also affect the total radiation of the array because the array unit does not work at the maximum power Power; For the unequal-phase array design method of changing the excitation phase of the array elements, more array elements need to be used compared with the unequal-amplitude array, and an expensive phase shifter is required...

AI Technical Summary

Problems solved by technology

[0003] However, the unequal spacing array design method has more difficulties compared with the unequal amplitude array design method and unequal phase array design method

First of all, the final element position of the array will have a large change in the entire array size range, and it is difficult to control. The more constraints on the array optimization, the less likely it is to obtain better optimization results; secondly, the distance between array elements Mutual coupling will change as the array element spacing changes, resulting in a large change in the radiation pattern of the element array and the active voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) of the element.

[0004] In the prior art, there are mainly two methods for the design of unequal-spaced arrays. The first method is mainly aimed at the optimization algorithm itself, and is committed to proposing a faster algorithm with stronger optimization capabilities, without considering the influence of mutual coupling between units or less consideration

Although this method makes a great contribution to the algorithm and takes less time, the result of the comprehensive design is only for the ideal point source, which is difficult to use in actual design

The second method considers the influence of inter-unit mutual coupling, because the change of the array unit spacing will cause the change of inter-unit mutual coupling, and in order to obtain more accurate optimization results, usually in each generation of comprehensive design of the array by using the optimization algorithm Both use full-wave analysis to obtain the direction diagram of the unit and substitute it into the comprehensive design. The process requires hundreds of generations of evolution. In each generation, the unit pattern is substituted to calculate the optimized array pattern, which means that the same number of full-wave analysis times is required, so this method takes a long time.

Using an algorithm with a faster convergence speed can improve the comprehensive design speed to a certain extent, but it does not fundamentally solve the problem of time consumption, and the convergence speed is too fast to easily lead to convergence to the local optimal value

[0005] In addition, the influence of the prior art on the mutual coupling of cells by the design method of unequal spacing array is mainly to consider the cell pattern in the cell array, extract the cell pattern in the cell array for optimization, and seldom consider the cell active voltage standing wave The impact of the deterioration of the ratio on the performance of the entire array

In fact, the influence of unit mutual coupling has a great influence on the unit pattern and active voltage standing wave ratio.

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