Design of Metamaterials for Microwave Frequencies

This report results from a contract tasking NCSR DEMOKRITOS as follows: Negative refractive index materials with simultaneously negative permittivity and permeability are usually constructed from periodic arrays of thin metal wires and split ring resonators. These structures are highly anisotropic, so their isotropic realizations demand three dimensional orthogonal arrangement which are not so easy to fabricate. The aim of this proposal is construction of isotropic homogeneous metamaterial at microwave frequencies that is easy to realize and has possibility of extension to infrared and optical frequencies. The project is organized into three phases with the duration three, six and three months accordingly. In Phase I, (System set up and calibration), the calibration procedures those are required to provide measurements with coaxial line standards and in a free space will we examined. The home made FORTRAN programs will be written to perform TRL (through-reflect-line) calibration procedure in a free space. In Phase II, (Samples preparation and measurement in coaxial line and free space), includes sample preparation and coaxial and free space measurements. Ferroelectric particles from barium titanate and rutile of different sizes (in millimeter and sub-millimeter ranges 0.1-3 mm) and of different volume fractions dispersed in neutral matrix will be used. In Phase III, (Preparation and measurement of final composites), includes analyzing measurement results, samples with suitable sets of particles will be chosen to construct artificial bi-spherical double negative composite. Sponsored in cooperation with Air Force Office of Scientific Research (AFOSR). Grant no. 07-3039. The original document contains color images.