BACK TO FRACTAL ADVANTAGE


INSTALLMENT 1 - October 2010

 

CASE I: WIDEBAND FRACTAL FILTER

“UWB FILTER USING” by DEFECTED GROUND STRUCTURE OF VON KOCH FRACTAL SHAPE SLOT

J. An, G.-M. Wang, W.-D. Zeng, and L.-X. Ma


(Missile Institute, Air Force Engineering University, Sanyuan PRC China)


Progress In Electromagnetics Research Letters, Vol. 6, 61–66, 2009

LINK: http://www.jpier.org/PIERL/pier.php?paper=08121309

SUMMARY:
An outstanding problem in electronics nowadays is producing better filters that tailor to wide bandwidths, while maintaining small sizes. The authors show an example of a superior fractal filter that can be used for UWB (ultra wideband), that has a 3-11 GHz bandwidth while maintaining miniature size, and no componentry. There is minimal insertion loss. The filter design uses a Koch ‘snowflake’ fractal of iteration 2.

The authors note the fractal filter results are superior to those achieved with (the conventional)split ring resonators.




CASE II: SMALLER NO-COMPROMISE FRACTAL PATCH ANTENNA

"LOW RCS FRACTAL PATCH ANTENNA"

G. Cui, Y. Liu, and S. Gong


(Lab of Antennas and Microwave Technology, Xidian University, 1, Shaanxi, China)


Journal of Electromagnetic Waves and Applications,21,15,2403-241, 2007

LINK: http://www.ingentaconnect.com/content/vsp/jew/2007/00000021/ 00000015/art00022

SUMMARY:
Antennas have shiny appearances to radar, so efforts are constantly made to make them be less shiny. These researchers use a fractal patch antenna design to shrink the size of the elements and array of elements, and also substantially reduce the ‘radar cross section’ (RCS), making it far less shiny to radar: tinier here means less shiny. Uses a Koch/Minkoski fractal pattern.

The authors note the fractal patch antenna filter results are superior to those achieved with conventional patch antennas, because there is virtually no degradation of performance-- while substantially reducing the RCS . In other words, they were able to show the fractal could make the antenna far smaller without degrading performance with the added bonus of being less detectable by radar.


 

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