Plenary Lecture

Metamaterial Antennas and Finlines Using Full Wave Analysis

Prof. Humberto César Chaves Fernandes
Department of Electrical Engineering,
Federal University of Rio Grande do Norte
77 Massachusetts Ave.
Lab. for Information and Decision Systems
Natal-RN, 59078-970, Brazil ,
P.O.Box 1583
Email: humberccf@ct.ufrn.br
 

Abstract: Metamaterials are been recently very used at telecommunications structures, and are defined as artificial effectively non-homogeneous electromagnetic materials with desired bi anisotropic dielectric and magnetic characteristics. In this paper the bilateral fin line and planar antennas with EBG – Electromagnetic Band Gap – metamaterial substrate is analyzed using the TTL - Transverse Transmission Line, concise full wave method.

Fin lines are widely used as a millimeter wave component due to its various advantages such as reduced size, weight, and low cost and in addition because it interfaces easily with other millimeter wave circuits. This letter demonstrates an application of the EBG metamaterial: an efficient bilateral fin line and microstrip antennas. The analysis is made using the TTL method and the metamaterial substrates. This objective of this presentation is to show the effect of dielectric anisotropy on bilateral finlines shown in Fig. 1 and antennas. The paper discusses the effect of anisotropy, on effective dielectric constants, attenuation constant and the pattern E and H fields by applying the anisotropy one by one in all three directions.

The EBG medium can not be characterized by assigning a single permittivity and permeability value for throughout the finite structure. In other words, the parameters depend on the spatial coordinates and this causes spatial dispersion. As a result of this, the medium will not be homogenous. For a non-homogeneous structure, the incident wave undergoes a process of multiple scattering. The substrate shown in region 2 of Fig.1 is modeled by utilizing bianisotropic tensor properties, which are expressed as:

To calculate the numerical results a computational program in Fortran PowerStation language, according to the theoretical analyses was developed. Compared to other full wave methods, the TTL is an efficient tool to determine the fin line and antennas characteristics, making possible a significant algebraic simplification of the equations involved in the process, and reducing the computational time.

The effective dielectric constant, the attenuation constant, and the pattern E and H fields are obtained. Comparison with the literature is presented. The new results obtained in 3D for these applications are presented at first time.

Brief Biography of the Speaker:
Humberto Cesar Chaves Fernandes was born in Martins-RN, Brazil. He received with laude the B.S. in Electrical Engineering from the Federal University of Rio Grande do Norte-UFRN, Brazil in 1977, the M.S. (1980), PhD (1984) degrees and Postdoctoral program (1986) from the State University of Campinas-UNICAMP, San Paulo, Brazil. His current research interests are microwave, millimeter waves, smart antennas array, superconductivity, semiconductor, neural networks, electromagnetic, photonics, metamaterial, dynamic methods and applications. Prof. Fernandes has more then four hundred published works. Since 1978 he is at the Electrical Engineering Department from the UFRN, where he is a Senior Researcher and Titular Professor.

Prof. Fernandes was General Chair of the ITS2002-SBrT/IEEE Consoc 2002, Natal-BR, SBT1993, Natal-BR, I,II, III and IV SPET, Natal-BR, TPC Chair of the IMOC/IEEE-MTT 1997, Natal-BR, SBMO2002, Recife-PE, BR, PIERS 2007, Beijing-China, PIERS 2007, Theca Republic, and member of various another National and International Committee Conferences, including WSEAS 2004, IMOC2001, IMOC2003, IMOC2005, IMOC2007, SBMO2000,

Prof. Fernandes is member of the SBrT (Brazilian Telecommunications Society), IEEE CONSOC (USA), SBMO (Brazilian Microwave and Optoelectronics Society), SBPMat (Brazilian Materials Research Society) and Fellow of the Electromagnetics Academy (USA).