Ultra-wideband photonic band gap crystal having selectable and c

Details Ultra-wideband photonic band gap crystal having selectable and c Ultra-wideband photonic band gap crystal having selectable and c

1995-10-30

1998-04-14

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Spiral or helical type

343785, 343787, 343909, 333202, H01Q 136

Patent

active

057397961

ABSTRACT:
The present invention provides multidimensional stacked photonic band gap crystal structures improving the performance of current planar monolithic antennas and RF filters by forbidding radiation from coupling into the substrate thereby significantly enhancing radiation efficiency and bandwidth. This invention comprises a number of sub-crystals with each having at least two lattices disposed within a host material, each lattice having a plurality of dielectric pieces arranged and spaced from each other in a predetermined manner, the sub-crystals being stacked in a crystal structure to provide a photonic band gap forbidding electromagnetic radiation propagating over a specially designed frequency band gap, or stopband. Both two dimensional and multidimensional crystals are disclosed. The preferred embodiment is a three-dimensional photonic band gap crystal comprising two or more sub-crystals, with each sub-crystal having a diamond-patterned lattice constructed from a plurality of dielectric zigzag pieces orthogonally interconnected, disposed within a host material.

REFERENCES:
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patent: 5357260 (1994-10-01), Roederer et al.
patent: 5386215 (1995-01-01), Brown
patent: 5389943 (1995-02-01), Brommer et al.
patent: 5410284 (1995-04-01), Jachowski
patent: 5471180 (1995-11-01), Brommer et al.
patent: 5541613 (1996-07-01), Lam et al.
patent: 5546059 (1996-08-01), Yorita et al.
E.R. Brown, "Photonic-Crystal Planar Antenna," 1993 Army Research Office hlights.
K.M. Leung et al, "Calculations of Dispersion Curves and Transmission Spectrum of Photonic Crystals: Comparisons with UWB Microwave Pulse Experiments", Ultra-Wideband, Short-Pulse Electromagnetics 2, pp. 331-340, Plenum Press, New York and London, Dec. 1994.
"Microwave Hardening Design Guide For Systems", HDL-CR-92-709-6, vol. 2, Apr., 1992.

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