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英语翻译

Based on the fractal miniaturized broadband microstrip antenna design

As a handsome, Wu Qiduo, zhang GuangQiu

(information engineering university of information engineering college, henan zhengzhou 450002).

Abstract: combining the advantages of the fractal theory, the simulation design the two based on the fractal technology of microstrip antenna.These two antenna adopts is

Hexagon structure, fractal iteration using microstrip line and coplanar waveguide feed, respectively.Through numerical simulation, the impedance characteristics of the antenna and

Direction graph is studied, the result shows that these two fractal antenna impedance bandwidth reaches about 90%, and in the whole work

Has the good radiation directivity in a spectrum.At the same time the introduction of the fractal structure, the realization of the antenna's miniaturization.

Key words: fractal antennas;Broad band;miniaturization

Broadband, miniaturization, become a hot issue of modern antenna study.Microstrip antenna because of its light weight, low profile, conformal miniaturization and easilyAnd can easily with advantages of integrated circuit, get the favour of the antenna designers.However, the bandwidth of the microstrip antenna is only 1% ~ commonly6% [1], narrow frequency band which is a major disadvantage limits its wide application.In recent years, many scholars and antenna engineers are working to microstrip antennaResearch work, a variety of interdisciplinary interaction lead to a new antenna technology.Literature [2] and the fractal technology, photonic crystal structureThe genetic algorithm in the application of microstrip antenna is presented.The use of new technology enables a microstrip antenna performance has a great improvement.With the pointsD self-similarity of fractal structure with its multiband, the characteristics of small size has incomparable advantages in antenna design.Fractal theory is put forward, and is widely applied to the research and design of antenna.Fractal technology because of its space filling and self-similarityPoint, makes the antenna in different scales with similar structure, can achieve a smaller physical range has larger electric length, can effectively extendThe antenna bandwidth and reduce the antenna size.At present there have been many reports of fractal wide-band antenna miniaturization research [3-5] and literature [4]With the tree fractal, through adjust the Angle of three parameters, 70% relative bandwidth;[5] the third order S ierp insk I square microstrip daysLine, increased due to the introduction of the fractal antenna resonance point, further broadening the antenna bandwidth;Literature [6] for the first time coplanar waveguide is presentedFractal Koch dipole antenna feeder, shows the fractal technology in the advantages to reduce the antenna size, but ignored the impact on the bandwidth of the antenna, phaseThe bandwidth is only 9%;In the literature [7], Koch of coplanar waveguide feed slot antenna not only realize the miniaturization, and the impedance bandwidth is reached 52%.Is proposed in this paper two based on the fractal structure of broadband microstrip antenna, antenna used feed microstrip line 1, 2 kinds of antenna with coplanar waveguide feed, both using fractal structure hexagon, and respectively, and do not add cent antenna is the comparative analysis,

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