US5132698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Choke-slot ground plane and antenna system
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1991-08-26
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Granted: 1992-07-21
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Expires: 2011-08-26
Abstract
Abstract A choke-slot ground plane and antenna system 30 is disclosed. In one embodiment the choke-slot ground plane and antenna system 30 includes a monopole antenna 44, a ground plate 36 having a plurality of concentric annular grooves 38a-c. Other embodiments include a ground plane 36 having varying size grooves to 38a-l, a ground plane having grooves having filled with dielectric material 38a'-c', a ground plate having a broadened bandwidth and having a series of first and second-type grooves 34a-c and 38a"-c", and a ground plate having a frusto-conical shape 36a and 36b.
Inventors
- 👤 Kevin D. Swineford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:56
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/32; H01Q9/38; H01Q1/00; H01Q1/48; Y; Y10; Y10S; Y10S343/00; Y10S343/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
28 words
An antenna system, comprising: a monopole antenna; a ground plate having a plurality of concentric annular grooves; and means for attaching said monopole antenna to said ground plate.
Claim 2
Dependent Claim
28 words
An antenna system, comprising: a monopole antenna; a ground plate having a plurality of concentric annular grooves; and means for attaching said monopole antenna to said ground plate.
Claim 3
Dependent Claim
16 words
The antenna system of claim 1, wherein said monopole antenna is perpendicular to said ground plate.
Claim 4
Dependent Claim
20 words
The antenna system of claim 1, wherein said attaching means is located central to said plurality of concentric annular grooves.
Claim 5
Dependent Claim
43 words
The antenna system of claim 1, wherein said monopole antenna has an operating wavelength, each said groove has a depth of 1/4 of the monopole operating wavelength, and each said groove has a width of a whole fraction of the monopole operating wavelength.
Claim 6
Dependent Claim
19 words
The antenna system of claim 4, wherein each said groove has a width of 1/8 the monopole operating wavelength.
Claim 7
Dependent Claim
19 words
The antenna system of claim 4, wherein each said groove has a width of 1/16 the monopole operating wavelength.
Claim 8
Dependent Claim
16 words
The antenna system of claim 1, wherein each said groove is filled with a dielectric material.
Claim 9
Dependent Claim
19 words
The antenna system of claim 7, wherein each said groove has a width of 1/4 the monopole operating wavelength.
Claim 10
Dependent Claim
38 words
The antenna system of claim 1, wherein said plurality of grooves have top surfaces which form a top plane and said attachment means is adjustable over a range of 0.0 inches to 0.5 inches above said top plane.
Claim 11
Dependent Claim
40 words
An antenna system, comprising: a monopole antenna; a ground plate having a plurality of closed grooves, said grooves having a common axis; and moving means, insulating said monopole antenna and ground plate, for moving said monopole along said common axis.
Claim 12
Dependent Claim
40 words
An antenna system, comprising: a monopole antenna; a ground plate having a plurality of closed grooves, said grooves having a common axis; and moving means, insulating said monopole antenna and ground plate, for moving said monopole along said common axis.
Claim 13
Dependent Claim
15 words
The antenna system of claim 10, wherein said closed grooves are concentric and substantially circular.
Claim 14
Dependent Claim
44 words
The antenna system of claim 10, wherein said moving means includes an adjustable feed section, said feed section has a body having a central bore and having an annular surface, said annular surface forming an angle with a plane normal to said common axis.
Claim 15
Dependent Claim
95 words
The antenna system of claim 10, wherein the monopole antenna is operable over wavelengths, λ a and λ b , wherein said closed grooves have a series of widths and depths corresponding to said wavelengths, said width and said depth for a first-type groove being λ a /n and λ a /4, respectively, said width and said depth for a second-type groove being λ b /n and λ b /4, respectively, said series having alternating first and second-types grooves, and where n is an integer and whereby the ground plane has an extended operating bandwidth.
Claim 16
Dependent Claim
37 words
An antenna system, comprising: a monopole antenna; a ground plate having a frusto-conical shape; a plurality of concentric annular grooves formed on said ground plate; and means for movably attaching said monopole antenna to said ground plate.
Claim 17
Dependent Claim
37 words
An antenna system, comprising: a monopole antenna; a ground plate having a frusto-conical shape; a plurality of concentric annular grooves formed on said ground plate; and means for movably attaching said monopole antenna to said ground plate.
Claim 18
Dependent Claim
24 words
The antenna system of claim 14, wherein the ground plate, the plurality of concentric annular grooves, and the monopole antenna have a common axis.
Claim 19
Dependent Claim
18 words
The antenna system of claim 14, wherein the frusto-conical shaped ground plate slopes upwardly toward the monopole antenna.
Claim 20
Dependent Claim
18 words
The antenna system of claim 14, wherein the frusto-conical shaped ground plate slopes downwardly from the monopole antenna.
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) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |