US4843403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband notch antenna
Assignee: BAE Systems Space & Mission Systems Inc
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Filing: 1987-07-29
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Granted: 1989-06-27
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Expires: 2007-07-29
Abstract
Abstract The subject invention relates to an antenna having broadband characteristics. The antenna is a dual notch device capable of receiving or transmitting electromagnetic waves comprising a substrate, an upper planer conducting antenna element disposed on one side of the surface of said substrate and having a first curved edge, a second conducting antenna element disposed on the other side of said substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart in close proximity at one point to define a feed-point therebetween with adjacent curved edges gradually tapering outwardly therefrom to define flared notches interfacing one another and interconnected by said gap.
Inventors
- 👤 Farzin Lalezari
- 👤 Charles G. Gilbert
- 👤 John M. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:16
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q13/106; H01Q13/08; H01Q13/085
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
111 words
An antenna structure for receiving or transmitting electromagnetic waves comprising a substrate having an outer surface, a first conducting radiator disposed on one side of the outer surface of said substrate and having a first curved edge, a second conducting radiator disposed on the other side of the outer surface of said substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart in close proximity at one point to define a feed-point gap therebetween with adjacent curved edges gradually tapering outwardly therefrom to define first and second continuous flared notches interfacing one another and emanating from said feed-point gap.
Claim 2
Dependent Claim
111 words
An antenna structure for receiving or transmitting electromagnetic waves comprising a substrate having an outer surface, a first conducting radiator disposed on one side of the outer surface of said substrate and having a first curved edge, a second conducting radiator disposed on the other side of the outer surface of said substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart in close proximity at one point to define a feed-point gap therebetween with adjacent curved edges gradually tapering outwardly therefrom to define first and second continuous flared notches interfacing one another and emanating from said feed-point gap.
Claim 3
Dependent Claim
21 words
An antenna as recited in claim 1 wherein the first and second radiators are metallizations bonded to said substrate by electrodeposition.
Claim 4
Dependent Claim
23 words
An antenna as recited in claim 1 wherein each notch is defined by a pair of curved metallizations converging towards the feed-point gap.
Claim 5
Dependent Claim
18 words
An antenna as recited in claim 1 wherein the flared notches are both disposed in a common plane.
Claim 6
Dependent Claim
26 words
An antenna as recited in claim 1 wherein the flared notches are in parallel planes spaced apart at a distance substantially less than a quarter wavelength.
Claim 7
Dependent Claim
93 words
A nonresonant antenna having a radiation pattern and impedance characteristics that are essentially independent of frequency over a wide bandwith comprising a support substrate, a first metallization disposed on the surface of said substrate and having a first curved edge, a second metallization disposed on the substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart from a feed-point gap, the curved edges of each metallization gradually tapering outwardly from said gap to define a pair of continuous dual flared notches.
Claim 8
Dependent Claim
93 words
A nonresonant antenna having a radiation pattern and impedance characteristics that are essentially independent of frequency over a wide bandwith comprising a support substrate, a first metallization disposed on the surface of said substrate and having a first curved edge, a second metallization disposed on the substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart from a feed-point gap, the curved edges of each metallization gradually tapering outwardly from said gap to define a pair of continuous dual flared notches.
Claim 9
Dependent Claim
22 words
An antenna as recited in claim 6 wherein the curved edges defining the notches flare outwardly according to a continuous parabolic function.
Claim 10
Dependent Claim
18 words
An antenna as recited in claim 7 wherein the notches flare outwardly according to a continuous linear function.
Claim 11
Dependent Claim
23 words
An antenna as recited in claim 6 wherein the substrate comprises a material selected from the group consisting of polytetrafluoroethylene, fiberglass, and alumina.
Claim 12
Dependent Claim
110 words
An antenna structure for receiving and transmitting electromagnetic waves comprising a substrate, an upper planar conducting antenna element on one side of the surface of said substrate and having a first curved edge, a lower planar conducting antenna element disposed on the adjacent side and having a second curved edge closely related to the first curved edge in close proximity and spaced apart from each other to define a feed-point gap at a point of closest proximity therebetween with each antenna element and its associated curved edge on different sides of the substrate, each curved edge gradually tapering outwardly from the gap to define first and second continuous flared notches.
Claim 13
Dependent Claim
110 words
An antenna structure for receiving and transmitting electromagnetic waves comprising a substrate, an upper planar conducting antenna element on one side of the surface of said substrate and having a first curved edge, a lower planar conducting antenna element disposed on the adjacent side and having a second curved edge closely related to the first curved edge in close proximity and spaced apart from each other to define a feed-point gap at a point of closest proximity therebetween with each antenna element and its associated curved edge on different sides of the substrate, each curved edge gradually tapering outwardly from the gap to define first and second continuous flared notches.
Claim 14
Dependent Claim
20 words
An antenna structure as recited in claim 10 wherein the antenna elements are electrically coupled to a metallized transmission line.
Claim 15
Dependent Claim
19 words
An antenna structure as recited in claim 10 wherein the antenna elements are electrically coupled to a coaxial cable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |