tailieunhanh - Microstrip Antennas Part 8

Tham khảo tài liệu 'microstrip antennas part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Methods to Design Microstrip Antennas for Modern Applications 199 Fig. 26. Operation of the antenna of fig. 25b a Scattering coefficient at the input of each probe in the and b Scattering coefficient at the input of each probe in the to 3GHz Fig. 27. Radiation patterns of the antenna of fig. 25 the power gain components at on xz- and yz-plane 180 b 180 Fig. 28. Radiation patterns of the antenna of fig. 25 the power gain components at GHz on xz- and yz-plane 200 Microstrip Antennas b Sierpinski fractals Another fractal concept widely used for the design microstrip antennas is the Sierpinski fractal 61 - 69 . Various Sierpinski fractal objects have been proposed The Sierpinski Gasket or Triangle the Sierpinski Carpet or rectangle the Sierpinski Pentagon and the Sierpinski Hexagon. Judging from the literature the most efficient shapes for antenna applications are the carpet and especially the gasket. Monopole or dipole gasket fractal microstrip schemes have been proposed as multifrequency antennas. Although the Sierpinski objects are based on different geometrical basis they share the same construction principle. The geometrical construction of the popular Sierpinski gasket begins with an equilateral triangle which is considered as generator fig. 29a . The next step in the construction process is to remove the central triangle namely the one with vertices that are located at the midpoints of the sides of the original triangle. After the substruction three equal triangles remain on the structure each one being half of the size of the original one fig. 29b . This process is then repeated for the three remaining triangles etc figures 29c 29d . If the iteration is carried out an infinite number of times the ideal fractal Sierpinski gasket is obtained. In each stage of the fractal building each one of the three main parts of the produced structure is exactly similar to the whole object but scaled by a factor. Thus the .

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