Manipulating the directivity of antennas with metamaterial.

In this paper we use spatially variant metamaterial substrate to manipulate the directivity of antennas. We show theoretically that by embedding a dipole at different locations inside this substrate, the emitted rays can be directed to different orientations as required. As a result, spatial multiplexing can be realized by carefully selecting proper parameters of this substrate. It can also be observed that the electric field received in this antenna system is enhanced when it is used for reception. Simulations based on finite element method are used to validate our theoretical analysis, showing a controllable high directive property. In order to simplify the physical realization process, we propose the reduced parameters for practical design and also study it with numerical simulations.

[1]  M.Y. Vyatkin,et al.  High-power CW linearly polarized all-fiber Raman laser , 2004, IEEE Photonics Technology Letters.

[2]  J. Pendry,et al.  Electromagnetic analysis of cylindrical invisibility cloaks and the mirage effect. , 2007, Optics letters.

[3]  David R. Smith,et al.  Full-wave simulations of electromagnetic cloaking structures. , 2006, Physical review. E, Statistical, nonlinear, and soft matter physics.

[4]  R. Weder.  A rigorous analysis of high-order electromagnetic invisibility cloaks , 2007, 0711.0507.

[5]  A. Elsherbeni,et al.  Scattering of Obliquely Incident Plane Wave by an Array of Parallel Concentric Metamaterial Cylinders , 2007 .

[6]  Richard W Ziolkowski,et al.  Propagation in and scattering from a matched metamaterial having a zero index of refraction. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.

[7]  J. Pendry,et al.  Calculation of material properties and ray tracing in transformation media. , 2006, Optics express.

[8]  Yu Luo,et al.  DIRECTIVE EMISSION OBTAINED BY COORDINATE TRANSFORMATION , 2007, 0712.2755.

[9]  A. B. Ruffin,et al.  Al/Ge co-doped large mode area fiber with high SBS threshold. , 2007, Optics express.

[10]  Kazuo Aida,et al.  Ultra-wideband optical amplification with 3 dB bandwidth of 65 nm using a gain-equalised two-stage erbium-doped fibre amplifier and Raman amplification , 1997 .

[11]  J. Taylor,et al.  Dual wavelength pumped L- and U-band Raman amplifier , 2001 .

[12]  Z. Jacob,et al.  Impedance matched hyperlens , 2007, 2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science.

[13]  J R Taylor,et al.  Watts-level frequency doubling of a narrow line linearly polarized Raman fiber laser to 589nm. , 2005, Optics express.

[14]  J. Pendry,et al.  Magnetism from conductors and enhanced nonlinear phenomena , 1999 .

[15]  Ken-ichi Ueda,et al.  589 nm Light Source Based on Raman Fiber Laser , 2004 .

[16]  G. Tayeb,et al.  A metamaterial for directive emission. , 2002, Physical review letters.

[17]  Fan Yang,et al.  A DUAL BAND CIRCULARLY POLARIZED RING ANTENNA BASED ON COMPOSITE RIGHT AND LEFT HANDED METAMATERIALS , 2008 .

[18]  R. Weder.  The Boundary Conditions for Electromagnetic Invisibility Cloaks , 2008 .

[19]  Design and Experiment of One Dimension and Two Dimension Metamaterial Structures for Directive Emission , 2007 .

[20]  David R. Smith,et al.  Controlling Electromagnetic Fields , 2006, Science.

[21]  Wenshan Cai,et al.  Designs for optical cloaking with high-order transformations. , 2008, Optics express.

[22]  R. Shelby,et al.  Experimental Verification of a Negative Index of Refraction , 2001, Science.

[23]  N. Engheta,et al.  A positive future for double-negative metamaterials , 2005, IEEE Transactions on Microwave Theory and Techniques.

[24]  Hongsheng Chen,et al.  Electromagnetic wave interactions with a metamaterial cloak. , 2007, Physical review letters.

[25]  Richard W. Ziolkowski,et al.  Metamaterial-based efficient electrically small antennas , 2006 .

[26]  Yijun Feng,et al.  Electromagnetic cloaking by layered structure of homogeneous isotropic materials. , 2007, Optics express.

[27]  Willie J Padilla,et al.  Composite medium with simultaneously negative permeability and permittivity , 2000, Physical review letters.

[28]  P. Andrekson,et al.  Increase of the SBS threshold in a short highly nonlinear fiber by applying a temperature distribution , 2001 .