US4546358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large broadband free radiating electromagnetic test cell
Assignee: United States Department of the Army
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Filing: 1984-01-19
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Granted: 1985-10-08
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Expires: 2004-01-19
Abstract
Abstract This disclosure sets forth a device which produces uniform electromagneticields in the medium frequency (MF) and high frequency (HF) regimes over significantly large test volumes. The device converts electromagnetic energy available from a standard radio-frequency transmitter into a vertically polarized uniform electromagnetic field which propagates through a large open region and is dissipated/radiated at the termination. A broadband (MF and HF) electromagnetic radiation over a large test volume is provided.
Inventors
- 👤 George R. Edlin
- 👤 Thomas H. Shumpert
- 👤 Brian R. Strickland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:26
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/08; G; G01; G01R; G01R29/00; G01R29/08; G01R29/0807; G01R29/0814; G01R29/0821; G01R29/0828; H01Q15/00; H01Q15/02; H01Q15/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A broadband uniform electromagnetic field environment producing system comprising first and second parallel-plate transmission line elements adapted to be connected to an electromagnetic generating device at one end; said first transmission line element being a large conducting ground plane; said second transmission line element being spacially located parallel to said first element whereby the electromagnetic field environment is produced between first and second elements; a plurality of resistors connected to the other end of said second element and to said first element so as to act as termination loads to a band of frequencies in the lower range of the broadband electromagnetic field produced; and a horn element connected to said other end of said second transmission line element for allowing an upper band of frequencies of said broadband electromagnetic field to be transmitting out of the environment.
Claim 2
Dependent Claim
138 words
A broadband uniform electromagnetic field environment producing system comprising first and second parallel-plate transmission line elements adapted to be connected to an electromagnetic generating device at one end; said first transmission line element being a large conducting ground plane; said second transmission line element being spacially located parallel to said first element whereby the electromagnetic field environment is produced between first and second elements; a plurality of resistors connected to the other end of said second element and to said first element so as to act as termination loads to a band of frequencies in the lower range of the broadband electromagnetic field produced; and a horn element connected to said other end of said second transmission line element for allowing an upper band of frequencies of said broadband electromagnetic field to be transmitting out of the environment.
Claim 3
Dependent Claim
42 words
A system as set forth in claim 1 wherein said horn element is a flared extension of said second transmission line element in both a horizontal and vertical plane with respect to a plane that said second transmission line is located in.
Claim 4
Dependent Claim
30 words
A system as set forth in claim 2 wherein said flared extension is of a length approximately 1/4 of a wave length of the mid frequency of the upper band.
Claim 5
Dependent Claim
43 words
A system as set forth in claim 3 further comprising a tapered transmission line extension at the one end of said transmission line element for connecting to the generating device; and said transmission lines being constructed such that a constant impedance is maintained.
Claim 6
Dependent Claim
39 words
A system as set forth in claim 4 wherein said resistors are designed to have inductive properties for properly terminating the upper part of the lower band and the lower part of the upper band of electromagnetic field frequencies.
References Cited (Backward Citations)
US4218683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |