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INSTALLMENT 2 - NOVEMBER 2010


CASE III: BETTER METAMATERIALS WITH FRACTALS

“HOMOGENIZATION OF METAMATERIALS DUE TO FRACTALOID STRUCTURES IN THE MICROWAVE REGIME”


E. Lenz and H. Henke


TU Berlin, Fachgebiet Theoretische Elektrotechnik, Berlin, Germany


Journal of Optics A: Pure and Applied Optics , 11, 114021 (Nov 2009)

LINK: http://iopscience.iop.org/1464-4258/11/11/114021/

SUMMARY:

Metamaterials use resonators to achieve their unusual properties. These authors confirm the benefits of using fractals as resonators in metamaterials for dramatically reduced size and better performance of metamaterial transmission, that is, less loss, and better bandwidth with smaller size. This enables many applications previously believed not possible, especially in the microwave regime.

The authors note fractal metamaterials are superior to those made with split ring resonators. To wit: A remarkable reduction of the resonance frequency is achieved by substitution of the usual split ring resonator by fractal structures.


CASE IV: IMPROVED MINIATURE BANDPASS FILTER WITH FRACTALS

“RESONANT PROPERTIES OF THE SIERPINSKI-BASED FRACTAL RESONATOR AND ITS APPLICATION ON LOW-LOSS MINIATURIZED DUAL-MODE BANDPASS FILTER”


C . Ye, Y. Su, M. Weng, and H. Wu


Institute of Microelectronics, National Nanodevice Laboratory, and Department of Electrical Engineering, National Cheng Kung University, Taiwan


Microwave and Optical Technology Letters, 51: 1358–1361. (May, 2009)

LINK: http://onlinelibrary.wiley.com/doi/10.1002/mop.24321/abstract

SUMMARY:
We invented fractal resonators 15 years ago, and are happy to see academics, such as these in Taiwan, independently articulate the distinct advantages. Here, these researchers independently corroborate the benefit of using a Sieperpinski fractal as a bandpass filter. This tiny dual mode structure also allows control of multiple passbands, and has low insertion loss.

The authors note the Sierpinski fractal is superior in making a miniature bandpass filter with low loss, dual modes, and multiband capability, tasks usually relegated to several larger filters rather than a single one. So, ONE REPLACES MANY in this instance.


 

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