Method for optimizing linear array antenna radiation pattern
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A technology of antenna pattern and optimization method, applied in antennas, instruments, calculation models, etc., can solve problems such as limited adjustment of variable parameters, and achieve the effect of improving probability and speed
Inactive Publication Date: 2011-07-13
西安新海天通信有限公司
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The existing direction map synthesis method based on genetic algorithm, according to the iterative optimization process of genetic algorithm, has limited adjustment of variable parameters, so it cannot flexibly solve the weight problem of compromise or priority of each index
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Embodiment 1
[0042] Step 1, set parameters
[0043] According to the requirements of the system, the number of array elements N=10, the operating frequency 1880MHz≤F≤2025MHz, the height of the array element H=30mm, the length of the array element arm L=30mm and the downtilt angle θ max =0°, the level value of the pattern requires that both the upper side lobe and the lower side lobe are suppressed below -20dB.
[0044] Step 2, generate the corresponding level suppression fitness function fitness according to the given level value requirements 1 , level filling fitness function fitness 2 and downtilt angle fitness function fitness 3 .
[0045] The fitness function prototype is:
[0046] fitness 1 =∑(max(f(θ), f 0 (θ))-f 0 (θ)) m +∑abs(max(f(θ), f 0 (θ))-f 0 (θ))
[0047] fitness 2 =∑(min(f(θ), f 0 (θ))-f 0 (θ)) m +∑abs(min(f(θ), f 0 (θ))-f 0 (θ))
[0048] fitness 3 =(f(θ max )-f 0 (θ max )) m +|f(θ max )-f 0 (θ max )|;
[0049] Since the level value given by the s...
Embodiment 2
[0084] Step 1, set parameters.
[0085] According to the requirements of the system, the number of array elements N=10; the working frequency is 1880MHz≤F≤2025MHz; the height of the array element is H=30mm; max =6°; the unit spacing is specified as d(i)=115mm; the excitation amplitudes of 10 units are respectively given as: 1, 1, 1, 1, 1.414, 1.414, 1.414, 1.414, 1.414, 1.414; the pattern level The value requires that the upper side lobe be suppressed to below -20dB, and the first zero value of the lower side lobe is filled to above -15dB.
[0086] Step 2, generate the corresponding level suppression fitness function fitness according to the given level value requirements 1 , level filling fitness function fitness 2 and downtilt angle fitness function fitness 3 .
[0087] The fitness function prototype is
[0088] fitness 1 =∑(max(f(θ), f 0 (θ))-f 0 (θ)) m +∑abs(max(f(θ), f 0 (θ))-f 0 (θ))
[0089] fitness 2 =∑(min(f(θ), f 0 (θ))-f 0 (θ)) m +∑abs(min(f(θ), f 0...
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Abstract
The invention discloses a method for optimizing a linear array antenna radiation pattern, which mainly solves the problems of low shaping and optimizing speed, low accuracy and low flexibility of the conventional antenna radiation pattern. The method comprises the following steps of: (1) setting parameters given by a system and a radiation pattern level value required by the system; (2) generating a level restraining fitness function, a level filling fitness function and a lower inclination angle fitness function according to the radiation pattern level value required by the system; (3) initializing excitation amplitude, an excitation phase and a unit distance parameter, and performing iterative optimization according to an optimizing formula until the requirement that the sum of values of the three fitness functions is equal to zero can be met; and (4) generating an antenna radiation pattern from the optimized excitation amplitude and / or the optimized excitation phase and / or the unit distance according to the theory of the array antenna radiation pattern so as to finish optimization on the radiation pattern. The method has advantages of high calculation speed, high accuracy and strong flexibility, and the optimized design, meeting the various system requirements, of the linear array antenna radiation pattern can be achieved.
Description
technical field [0001] The invention belongs to the technical field of antennas, relates to the shaping optimization of an antenna pattern, and can be used for pattern design of a linear array antenna. Background technique [0002] The antenna pattern is an index to examine the coverage effect of the antenna, and its pros and cons directly determine whether the wireless communication system can work normally. The process of solving the excitation amplitude, phase and element spacing of the array antenna according to the antenna index and beam shape required by the system is called pattern synthesis. The method of synthesizing the array antenna pattern is mainly to design the pattern of the alignment factor, and then finally solve the pattern of the antenna required by the project according to the principle of taking advantage of the pattern. In different applications, there are different requirements for the antenna pattern, and it becomes very important to synthesize a var...
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