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Low-sidelobe sharp-cutoff flat-topped wave beam base station antenna and design method thereof

A technology of base station antenna and design method, which is applied in the directions of antenna, antenna coupling, antenna array, etc., can solve the problems of antenna arrays that are difficult to embed each other, increase design complexity, and poor antenna practicability, etc., and achieve radiation performance indicators and array size optimization , increase the degree of design freedom, and reduce the size of the array

Active Publication Date: 2017-06-09
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the more the number of units, the more beneficial it is to realize beamforming. In order to meet the basic pattern requirements, especially when there are certain requirements for the antenna sidelobe level and the transition area, the number of antenna units needs to reach a certain scale, which directly leads to The overall size of the array is too large
[0005] 3. Designing a broadband antenna unit is a common idea to realize the broadband operation of the base station antenna, but the traditional beamforming is aimed at a single frequency point, which makes it impossible to guarantee the stability of the pattern within the frequency band, especially when the signal coverage is required to be certain In some cases, the significant difference between the main lobe width at the low frequency band and the high frequency end makes the antenna very poorly practical
The disadvantage of this method compared to the use of broadband antenna units is that it will increase the size and weight, which makes it more difficult to reconcile the original cramped overall size requirements; two sets of antenna units and two sets of excitation networks need to be designed, and the design complexity increases; For more complex beamforming, the antenna arrays in the high and low frequency bands are difficult to embed each other in the layout

Method used

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  • Low-sidelobe sharp-cutoff flat-topped wave beam base station antenna and design method thereof
  • Low-sidelobe sharp-cutoff flat-topped wave beam base station antenna and design method thereof
  • Low-sidelobe sharp-cutoff flat-topped wave beam base station antenna and design method thereof

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Embodiment 1

[0041] like figure 1 As shown, first determine that the radiation pattern that needs to be synthesized is a low-sidelobe sharp-cut flat-top beam, which satisfies the E-plane and H-plane main lobe width of 50°±5°, the sidelobe level is lower than -20dB, and the working frequency band is 1.71-2.69GHz, the overall size of the array is less than 560×560mm 2 , Considering the size of the actual antenna unit and the coupling between the units, the spacing between the units is limited to not less than 56mm.

[0042]Choose the decomposition-based multi-objective evolutionary algorithm (MOEA / D) and set the unit excitation amplitude, phase, unit spacing and unit selectivity in the two frequency bands of the low (1.71-2.17GHz) / high (2.3-2.69GHz) frequency bands as variables, The pattern characteristics of the two frequency points of 1.71GHz and 2.69GHz and the overall array size are the optimization targets.

[0043] According to the symmetry of the target direction diagram, the multi-...

Embodiment 2

[0051] like Figure 13 As shown, in order to further highlight the important role played by the selectivity of different frequency band units and the unit spacing as variables in this method, a base station antenna with a square flat-top beam is further integrated in this embodiment, and it can be clearly seen from its structure diagram It can be seen that the spacing between different units is significantly different. Since some units at the four corners of the array are selected as invalid in all frequency bands, these units are directly deleted.

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Abstract

The invention discloses a low-sidelobe sharp-cutoff flat-topped wave beam base station antenna and a design method thereof. The low-sidelobe sharp-cutoff flat-topped wave beam base station antenna is characterized in that a dual-polarized base station antenna with low-sidelobe level and sharp-cutoff characteristic is systematically designed based on a multi-target optimization algorithm; and unit selectivity at different frequency bands is introduced for obtaining directional diagram stability in a wide frequency band. The low-sidelobe sharp-cutoff flat-topped wave beam base station antenna is advantageous in that the low-sidelobe sharp-cutoff flat-topped wave beam base station antenna can satisfy technical requirements in a low frequency band and a high frequency band or the technical requirement in the wide frequency band by means of a certain specific unit. The low-sidelobe sharp-cutoff flat-topped wave beam base station antenna has advantages of small dimension and simple design. The design method of the invention can be flexibly used in a wireless communication system with a different-form signal coverage requirement.

Description

technical field [0001] The invention belongs to the technical field of antenna engineering, and relates to a shaping technology and a design method of a communication base station, specifically a wide-band flat-top beam design method based on a multi-objective optimization algorithm and introducing unit selectivity and a specific planar array base station antenna It can be flexibly used in wireless communication systems with different signal coverage requirements. Background technique [0002] In the mobile communication system, the base station antenna plays an important role in uploading and distributing, and its performance directly affects the communication quality of the entire communication system. With the development of mobile communication systems, the distribution of base station antennas in cities is becoming more and more dense, and the interference between base stations is becoming more and more serious. For this reason, mobile operators have begun to carry out...

Claims

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Application Information

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IPC IPC(8): H01Q21/00H01Q1/52
CPCH01Q1/523H01Q21/0087
Inventor 陈益凯汪承慧杨仕文郭力文
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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