US3587107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time limited impulse response antenna
Assignee: Unisys Corp
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Filing: 1969-06-11
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Granted: 1971-06-22
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Expires: 1989-06-11
Abstract
Abstract An antenna for producing an output pulse of desired duration in response to an impulsive wave front includes a resistive plate mounted above a ground plane. A coaxial transmission line projects through the ground plane so that its center conductor contacts the resistive plate and its outer conductor terminates flush with the ground plane. The resistive plate consists of a submicron film of resistive material deposited on a dielectric backing and is spaced from the ground plane at a distance approximating the distance travelled by an electromagnetic wave in a time equal to the desired pulse duration.
Inventors
- 👤 Gerald F Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:34
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/005; H01Q1/00; H01Q1/36; H01Q1/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
An antenna for providing a pulse having a desired time duration comprising a flat ground plane having an aperture therein, a flat resistive member disposed parallel to said ground plane and supported at a predetermined distance from said ground plane, a coaxial transmission line extending into said aperture, an outer conductor on said transmission line terminating in said ground plane and electrically connected to said ground plane, an inner conductor extending through the region between said ground plane and said resistive member, said inner conductor being electrically connected to said resistive member, said resistive member having a surface resistivity substantially equal to the impedance of free space, said predetermined distance being substantially equal to the distance travelled by an electromagnetic wave in a time equal to the desired pulse duration.
Claim 2
Dependent Claim
130 words
An antenna for providing a pulse having a desired time duration comprising a flat ground plane having an aperture therein, a flat resistive member disposed parallel to said ground plane and supported at a predetermined distance from said ground plane, a coaxial transmission line extending into said aperture, an outer conductor on said transmission line terminating in said ground plane and electrically connected to said ground plane, an inner conductor extending through the region between said ground plane and said resistive member, said inner conductor being electrically connected to said resistive member, said resistive member having a surface resistivity substantially equal to the impedance of free space, said predetermined distance being substantially equal to the distance travelled by an electromagnetic wave in a time equal to the desired pulse duration.
Claim 3
Dependent Claim
20 words
The antenna of claim 1 wherein said predetermined distance is large with respect to the transverse dimension of said aperture.
Claim 4
Dependent Claim
29 words
The antenna of claim 2 wherein the flat resistive member is a disc having a radius at least 100 times as great as the diameter of said inner conductor.
Claim 5
Dependent Claim
18 words
The antenna of claim 3 wherein said predetermined distance is comparable to the radius of said resistive member.
Claim 6
Dependent Claim
19 words
The antenna of claim 4 wherein said resistive member includes a thin resistive film formed on an insulating substrate.
Claim 7
Dependent Claim
21 words
The antenna oF claim 5 wherein said resistive film is a submicron thick film of chromium deposited on a glass substrate.
Claim 8
Dependent Claim
15 words
The antenna of claim 6 wherein the inner conductor is normal to said ground plane.
Claim 9
Dependent Claim
24 words
The antenna of claim 7 wherein said coaxial transmission line is formed from RG-9 coaxial cable and said predetermined height is approximately 6 inches.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |