US4005429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camouflaged VHF antenna
Assignee: United States Department of the Army
•
Filing: 1975-10-08
•
Granted: 1977-01-25
•
Expires: 1995-10-08
Abstract
Abstract A camouflaged VHF antenna for military vehicles. A false roof is fitted tohe roof of the vehicle's metal shelter. The false roof includes a U-shaped slot which is parallel to the left and right edges and the rear edge of the vehicle roof. The slot is fed at the center of the U and tuning circuits are connected to the left and right edges of the slot.
Inventors
- 👤 Kurt Ikrath
- 👤 William Kennebeck
- 👤 Edward C. Shaffer
- 👤 Peter J. Pingitore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:06
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3275; H01Q13/00; H01Q13/10; H01Q13/18; Y; Y10; Y10S; Y10S428/00; Y10S428/919
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
In combination with a vehicle, or the like, having a metal body, an antenna which comprises: a false, metal roof substantially co-extensive and parallel with the roof of said body, but spaced apart therefrom, said false roof having: a U-shaped slot parallel to the left, right and rear edges of said false roof; means for energizing said slot with a source of r.f. energy; and antenna tuning means connected to said slot for producing a controlled radiation pattern at the frequency of interest by surface currents induced in said vehicle.
Claim 2
Dependent Claim
90 words
In combination with a vehicle, or the like, having a metal body, an antenna which comprises: a false, metal roof substantially co-extensive and parallel with the roof of said body, but spaced apart therefrom, said false roof having: a U-shaped slot parallel to the left, right and rear edges of said false roof; means for energizing said slot with a source of r.f. energy; and antenna tuning means connected to said slot for producing a controlled radiation pattern at the frequency of interest by surface currents induced in said vehicle.
Claim 3
Dependent Claim
30 words
The antenna according to claim 1 where d > > λ where d = the spacing between said roof and said false roof and λ = the wavelength of interest.
Claim 4
Dependent Claim
40 words
The antenna according to claim 1 wherein said tuning means is coupled to the left and right corners of said slot and said energizing means is coupled to the point of said slot midway between said left and right corners.
Claim 5
Dependent Claim
39 words
The antenna according to claim 1 wherein said energizing means is coupled to at least one of the corners of said slot and said tuning means is coupled to said slot midway between the left and right edges thereof.
Claim 6
Dependent Claim
42 words
The antenna according to claim 1 wherein said tuning means and the dimensions of said slot are selected such that surface currents are forced to flow in the vertical sides of said vehicle whereby said vehicle radiates a substantially vertically polarized signal.
Claim 7
Dependent Claim
43 words
The antenna according to claim 1 wherein said tuning means and the dimensions of said slot are selected such that surface currents are forced to flow across the horizontal surface of said false roof whereby said vehicle radiates a substantially horizontally polarized signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |