Closely coupled metallodielectric electromagnetic band-gap structures formed by double-layer dipole and tripole arrays

The concept of closely coupled metallodielectric electromagnetic band-gap (CCMEBG) structures is introduced and investigated using two-dimensional (2-D) double-layer dipole and tripole arrays. An efficient numerical method based on a set of coupled integral equations is used to simulate the double-layer array response. The arrays are placed in close proximity to each other and shifted appropriately in order to produce maximum element coupling. Measurements are presented for oblique plane wave and surface wave incidences. A substantial decrease of the stopband center frequency is observed with the CCMEBG design for both element geometries. Furthermore, wider bandwidth and improved angular stability as compared to single-layer MEBG is obtained. The tripole arrays arranged on a hexagonal lattice exhibit common stopband for any polarization of the incident field due to the symmetry of the element in conjunction with the lattice. The lowering of the resonance for up to 4 to 1 in simulation results emerges as the layers are separated by less than /spl lambda//1200 (0.1 mm at 2.5 GHz).

[1]  E. Gazit,et al.  Improved design of the Vivaldi antenna , 1988 .

[2]  Renato Orta,et al.  Multiple dielectric loaded perforated screens as frequency selective surfaces , 1988 .

[3]  J. Vardaxoglou,et al.  High gain planar antenna using optimised partially reflective surfaces , 2001 .

[4]  F. Stefan Johansson Analysis and design of double-layer frequency-selective surfaces , 1985 .

[5]  Simon Verghese,et al.  THREE-DIMENSIONAL METALLODIELECTRIC PHOTONIC CRYSTALS INCORPORATING FLAT METAL ELEMENTS , 1998 .

[6]  C. Kittel Introduction to solid state physics , 1954 .

[7]  N. V. Shuley Higher-order mode interaction in planar periodic structures , 1984 .

[8]  J. C. Vardaxoglou,et al.  Dipole and tripole metallodielectric photonic bandgap (MPBG) structures for microwave filter and antenna applications , 2000 .

[9]  D. Larkman,et al.  Photonic crystals , 1999, International Conference on Transparent Optical Networks (Cat. No. 99EX350).

[10]  J. C. Vardaxoglou,et al.  Modified FSS response from two sided and closely coupled arrays , 1994 .

[11]  Steven G. Johnson,et al.  Photonic Crystals: Molding the Flow of Light , 1995 .

[12]  Mario Sorolla,et al.  Enhanced patch-antenna performance by suppressing surface waves using photonic-bandgap substrates , 1999 .

[13]  Ben A. Munk,et al.  Scattering from surface waves on finite FSS , 2001 .

[14]  R. Mittra,et al.  Techniques for analyzing frequency selective surfaces-a review , 1988, Proc. IEEE.

[15]  Yuan Li,et al.  Electromagnetic scattering from a PBG material excited by an electric line source , 2005, SPIE/OSA/IEEE Asia Communications and Photonics.

[16]  J. Vardaxoglou Frequency Selective Surfaces: Analysis and Design , 1997 .

[17]  Roger F. Harrington,et al.  Field computation by moment methods , 1968 .

[18]  A. S. Barlevy,et al.  Characterization of electromagnetic band-gaps composed of multiple periodic tripods with interconnecting vias: concept, analysis, and design , 2001 .

[19]  J. C. Vardaxoglou,et al.  Reconfigurable FSS response from two layers of slotted dipole arrays , 1996 .

[20]  Ben A. Munk,et al.  Frequency Selective Surfaces: Theory and Design , 2000 .

[21]  J. C. Vardaxoglou,et al.  Complementary frequency selective surfaces , 2000 .