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Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Session MTM-5 Microwave metamaterial applications II Chairperson: R. Ziolkowski, University of Arizona 09:30-10:10 Invited paper – S. Hrabar Metamaterials based on non-Foster elements 10:10-10:30 L. Di Palma, F. Frezza, L. Pajewski, E. Piuzzi, C. Ponti, G. Rossi and G. Schettini Experimental investigations on woodpile EBG metamaterials 10:30-10:50 F. Bilotti, L. Di Palma, and L. Vegni Analytical model of connected bi-omega structures for enhanced microwave transmission 52
Meta 2010 & FEM 2010 – Rome, 13-15 December 2010 Metamaterials based on Non-Foster Elements Silvio Hrabar (1) , Igor Krois (1) , Ivan Bonic (1) , and Aleksandar Kiricenko (1) (1) University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia– E-mail:Silvio.Hrabar@fer.hr It is well known that any passive metamaterial must satisfy basic dispersion constraints: � ��( �) � �� 0 , � �� ( �) � �� 0. (1) This fundamental issue is a cause of inherent narrowband behavior of all metamaterials (SNG, DNG, SNZ, DNZ). In [1], a possibility of going around the basic dispersion constrains by the use of non-Foster active elements such as negative capacitors and negative inductors, was predicted theoretically. Very recent experimental studies [2,3] showed that is indeed possible to build active (almost) dispersionless ENZ and MNZ metamaterials. Here, the basic physics of non-Foster metamaterials will be reviewed and several illustrative examples of practical prototypes developed at University of Zagreb will be presented. These include a 2D ENZ unit cell for broadband 2D electromagnetic cloak (Fig. 1) and a broadband ENZ RF transmission line with superluminal phase and group velocities (Fig. 2). Finally, currently investigated novel concepts of matched ‘EM nihility’ and frequency independent active transmission lines will be highlighted. C 2+ C 1- �� NIC circuit located on the ground plane microstrip line via hole to negative C a substrate Effective permittivity Fig. 1: (After [2]), Upper: 2D active ENZ unit cell, Lower: Microstrip realization References [1] S. Tretyakov, ‘Meta-materials with wideband negative permittivity and permeability’, Microwave and Optical Technology Lett., Vol. 31, No. 3, pp. 163-165, November 2001 [2] S. Hrabar, I. Koris, A. Kiricenko, ‘Towards Active Dispersionless ENZ Metamaterial for Cloaking Applications’ , Metamaterials, Vol. 4 No. 2-3, pp. 89-97. August-September 2010 [3] S. Hrabar, I. Krois, I.Bonic, A Kiricenko, ‘Experimental Investigation of Active Broadband ENZ Transmission line’, Proc. on ‘Metamaterial Congress 2010, p.p 63-65, Karlsruhe, September 2010 53 Z 0 �x=�� CNE Realistic Realistic CNE Realistic CNE C �x=�� C �x=�� 2.0 1.9 1.8 1.7 1.6 1.5 active ENZ off 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 m10 0.4 0.3 0.2 0.1 0.0 m11 active ENZ on 0 5 10 15 20 25 30 35 40 45 50 freq, MHz Fig. 2: (After [3]) Upper : RF active ENZ transmission line, Lower: Measurement results C
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Page 3 and 4: Meta 2010 - Committees Chairmen Met
Page 7 and 8: Meta 2010 Foreword Ladies and Gentl
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