Efficient broadband antenna system using photonic bandgap crysta

Details Efficient broadband antenna system using photonic bandgap crysta Efficient broadband antenna system using photonic bandgap crysta

1994-11-03

1996-07-30

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Logarithmically periodic

343793, 343895, H01Q 1100

Patent

active

055416136

ABSTRACT:
A broadband antenna system utilizes multiple photonic bandgap crystals to achieve nearly 100 percent power efficiency over a larger range of frequencies than prior antenna systems. Multiple custom tailored photonic bandgap crystals form a substrate for the antenna system. Each of the crystals is designed to cover a specific range of frequencies. The multiple crystals are attached together to form a photonic bandgap substrate whose bandwidth varies as a function of location on the substrate. A broadband antenna that can cover a wide frequency range, and whose active region shifts to different portions of the antenna as a function of frequency, is formed on the substrate such that the active region of the antenna is always on a crystal that has a corresponding operating bandwidth. The photonic bandgap crystals provide a nearly 100 percent efficient reflector for radiation emitted into the substrate that would otherwise be trapped or dissipated therein.

REFERENCES:
patent: 5187461 (1993-02-01), Brommer et al.
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patent: 5386215 (1995-01-01), Brown
K. M. Ho, C. T. Chan, C. M. Soukoulis, "Existence of Phtonic Ban Gap in Periodic Dielectric Structures", Phys. Rev. Lett 67, 3152 (1990).
E. Yablonovitch, "Photonic Bandgap Structures", J. Opt. Soc. Am. b 10, 283 (1993).
E. R. Brown, C. D. Parker, E. Yablonovitch, "Radiation Properties of a Planar Antenna on a Photonic-Crystal Substrate", J. Opt. Soc. Am. B 10, 404 (1993).
Log-Periodic Dipole Arrays, The Electrical Engineering Handbook, pp. 868-869, edited by Richard C. Dorf, CRC Press, London (1993).

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