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Fractal structure-based dual-band circularly polarized antenna

A technology of circularly polarized antenna and fractal structure, which is applied in the direction of antenna, radiation element structure, antenna grounding switch structure connection, etc., can solve the problem of difficult coverage, etc., and achieve the effect of obvious antenna characteristics, small size and simple structure

Inactive Publication Date: 2017-06-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are usually two design methods for this kind of antenna. One is to design the broadband antenna to directly cover the two required frequency bands. However, the circular polarization bandwidth is usually much narrower than the impedance bandwidth, and it is difficult to cover two far frequency

Method used

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  • Fractal structure-based dual-band circularly polarized antenna
  • Fractal structure-based dual-band circularly polarized antenna
  • Fractal structure-based dual-band circularly polarized antenna

Examples

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Embodiment 1

[0030] The technical problems solved in this embodiment include:

[0031] 1. Solved how to use a double-layer board structure to design a large frequency difference dual-frequency circularly polarized antenna. The two-layer boards resonate in different frequency bands, and by adjusting the distance between the two-layer boards, the different operating frequency bands will not be affected by each other. The feeder part of the antenna adopts a tapered structure to generate two orthogonally polarized waves, thereby realizing circular polarization and realizing the design of a dual-frequency circularly polarized antenna.

[0032] 2. Solve how to use fractal structure to design antenna, so as to increase the bandwidth of circularly polarized antenna. The self-similarity of the fractal structure is applied to the antenna design. On the one hand, it can make the antenna have multi-frequency characteristics, and on the other hand, it can also increase the working bandwidth of the ant...

Embodiment 2

[0042] This embodiment is basically the same as Embodiment 1, the difference is: as Figure 9 As shown, the Sierpinski fractal structure is obtained in the following manner: an equilateral triangle is divided into four small regular triangles on average, and then the middle triangle is removed to obtain a first-order fractal Sierpinski triangle carpet. By repeating twice on an equilateral triangle, a third-order Sierpinski fractal structure is obtained.

Embodiment 3

[0044] This embodiment is basically the same as Embodiment 1, the difference is: as Figure 10 As shown, the Sierpinski fractal structure is obtained in the following way: the right triangle is divided into four small right triangles on average, and then a right triangle in the middle is removed to obtain the Sierpinski triangle carpet of the first-order fractal, and this step is used in the remaining three By repeating twice on a right triangle, a third-order Sierpinski fractal structure is obtained.

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Abstract

The invention provides a fractal structure-based dual-band circularly polarized antenna, which comprises an upper dielectric slab, an upper radiation paster, a lower dielectric slab, a lower radiation paster, a support column, an air layer and a bottom feeder line. The upper radiation patch is a Sierpinski third-order fractal structure. The lower-layer radiation paster is provided with a hollow structure. The miniaturization requirement of the actual application of the antenna can be met. Not only the double-frequency working requirements of a current communication system can be met, but also the anti-interference requirements of circularly polarized waves during the wireless wave antenna transmission process of the antenna can be met. The difference between two working frequency bands is larger, so that the two working frequency bands are less likely to be interfered by each other. The antenna is designed to be of a fractal structure, so that the bandwidth of the antenna is improved, wherein the circularly polarized bandwidth is at least larger than 200 MHz. A graded structure is adopted by the antenna for the generation of circularly polarized waves, so that the structure is simpler. The feed is simple and compact. By adopting the micro-strip line feed manner, the antenna is suitable for antenna installation and assembly. Compared with the conventional coaxial feed-point feeding manner and the multi-feed-point feeding manner, the feeding manner of the above antenna is greatly simplified.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a dual-frequency circularly polarized antenna based on a fractal structure. Background technique [0002] Combining the fractal theory with the antenna, the fractal antenna designed has advantages that the general antenna does not have. First, due to the self-similarity of the fractal structure, the multi-frequency characteristics of the antenna can be realized. Moreover, by adjusting the parameters in the fractal structure, the resonance points of multiple frequencies are drawn closer to each other, and the broadband characteristics of the antenna can also be realized. Secondly, due to the space-filling properties of the fractal structure, the miniaturization design of the antenna is also possible. [0003] At present, circularly polarized antennas have been widely used in many fields such as military communications, satellite communications, and satellite nav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/38H01Q1/50H01Q15/24H01Q5/10H01Q5/20
CPCH01Q1/38H01Q1/50H01Q5/10H01Q5/20H01Q15/24
Inventor 杨德强肖花耿东东曹飞飞王青松孙凯杨天明胡鉴中
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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