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 Title: |
US5541613:
Efficient broadband antenna system using photonic bandgap crystals
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Lam, Juan F.; Agoura Hills, CA
Wolfson, Ronald I.; Los Angeles, CA
Glaser, Jerome; Los Angeles, CA
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| Assignee: |
Hughes Aircraft Company, Hughes Electronics, Los Angeles, CA
other patents from HUGHES ELECTRONICS CORP. (722132) (approx. 887)
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| Published / Filed: |
1996-07-30
/ 1994-11-03
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| Application Number: |
US1994000333913
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| IPC Code: |
Advanced:
H01Q 11/10;
H01Q 15/00;
Core:
H01Q 11/00;
more...
IPC-7:
H01Q 11/00;
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| ECLA Code: |
H01Q11/10; H01Q15/00C;
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| U.S. Class: |
Current:
343/792.5;
343/793;
343/895;
Original:
343/792.5;
343/793;
343/895;
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| Field of Search: |
343/792.5,793,895,909,911 R
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| Priority Number: |
| 1994-11-03 |
US1994000333913 |
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| 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.
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| Attorney, Agent or Firm: |
Duraiswamy V. D. ;
Denson-Low, W. K. ;
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| Primary / Asst. Examiners: |
Hajec, Donald T.; Ho, Tan
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 10 claims |
We claim:
1. An efficient broadband antenna system, comprising:
- a photonic bandgap substrate with a bandgap and midband frequency that vary as a function of position on said substrate and
- a broadband antenna on said photonic bandgap substrate, the operating frequency of said antenna varying as a function of position on said antenna,
- said antenna positioned on said substrate so that the operating frequency of any portion of said antenna falls within the bandgap of the portion of said photonic bandgap substrate that is adjacent to it,
- said photonic bandgap substrate providing a Bragg reflector for reflecting radiation emitted from said broadband antenna, wherein said photonic bandgap substrate comprises a plurality of photonic bandgap crystals, each of said crystals providing said Bragg reflector for a respective range of frequencies.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 22 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS G1996-362142
DERABS G1996-362142
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| Other References: |
K. M. Ho, C. T. Chan, C. M. Soukoulis, "Existence of Phtonic Ban Gap in Periodic Dielectric Structures", Phys. Rev. Lett 67, 3152 (1990).
(4 pages)
Cited by 45 patents
E. Yablonovitch, "Photonic Bandgap Structures", J. Opt. Soc. Am. b 10, 283 (1993).
(13 pages)
Cited by 47 patents
[ISI abstract]
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).
(4 pages)
Cited by 14 patents
[ISI abstract]
Log-Periodic Dipole Arrays, The Electrical Engineering Handbook, pp. 868-869, edited by Richard C. Dorf, CRC Press, London (1993).
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