Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
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.
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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.
Carin Lawrence
Jasper, Jr. Louis J.
Leung K. Ming
Hajec Donald T.
Ho Tan
Tereschuk George B.
The United States of America as represented by the Secretary of
Zelenka Michael
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