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HL: Fachverband Halbleiterphysik

HL 29: New materials

HL 29.3: Vortrag

Dienstag, 26. Februar 2008, 12:30–12:45, ER 164

Numerical simulation of a fractal meta structure in the microwave regime — •Ernst Lenz, Benjamin Meier, and Heino Henke — TU Berlin, Fachgebiet Theoretische Elektrotechnik EN-2, Einsteinufer 17, 10587 Berlin, Germany

Metamaterials are artificial structures with novel and promising properties [1,2,3,4]. To reduce the unwanted scattering and diffraction effects of incoming electromagnetic waves it is necessary to achieve a higher degree of homogenization [1]. Therefore usually the unit cell size d is varied, while the wavelength λ remains constant.

We present simulation results of a fractal meta structure where we have replaced the well known split ring resonator (SRR) [2,3] by two concentric Koch snowflakes [5]. In that way a remarkable reduction of the resonance frequency could be achieved as compared to the SRR structure of the same spatial extent. Furthermore this results in a higher degree of homogenization of the introduced meta structure. Additionally we show that left-handed behavior is supported by simulation results as well as obtained by experimental data.
[1] V. G. Veselago, Sov. Phys. Usp. 10, 509 (1968). [2] J. B. Pendry et al., IEEE-TMTT 47, 2075 (1999). [3] D. R. Smith et al., PRL 84, 4184 (2000). [4] N. Engheta et al., IEEE-TMTT 53, 1535 (2005). [5] K. J. Falconer, Fraktale Geometrie, Spektrum, Berlin (1990).