US3757345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded end-fire antenna
Assignee: The Ohio State University
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Filing: 1971-04-08
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Granted: 1973-09-04
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Expires: 1991-04-08
Abstract
Abstract The in ention is for an antenna comprising an end-fire radiator in a shielded structure. A specific case is an axial-mode helical antenna in a conical horn which produces a circularly polarized pencil beam with low sidelobe level over a 2-to-1 bandwidth with a gain in the order of four times that of a simple helix.
Inventors
- 👤 K Carver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:26
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/02; H01Q11/00; H01Q11/02; H01Q11/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
157 words
An antenna comprising an end-fire radiating antenna and a shielding structure surrounding said element, said shielding structure comprises a conical electromagnetic horn, said radiating antenna is an axial mode helical conductor, and wherein the parameters of said antenna are within the following range: 30* < OR = phi o < OR = 70*0.75 lambda < OR = D < OR = 5.00 lambda 0.75 lambda < OR = Lc < OR = 4.00 lambda 0.25 lambda < OR = Ln < OR = 4.00 lambda 1 < OR = N < OR = 16 10* < OR = Alpha < OR = 16*0.90 lambda < OR = C < OR = 1.10 lambda wherein lambda free-space wavelength at design frequency phi o included cone angle D mouth diameter Lc truncated cone altitude Ln total axial length of helix N number of helix turns Alpha helix pitch angle C circumference of imaginary cylinder on which helix is wound.
Claim 2
Dependent Claim
157 words
An antenna comprising an end-fire radiating antenna and a shielding structure surrounding said element, said shielding structure comprises a conical electromagnetic horn, said radiating antenna is an axial mode helical conductor, and wherein the parameters of said antenna are within the following range: 30* < OR = phi o < OR = 70*0.75 lambda < OR = D < OR = 5.00 lambda 0.75 lambda < OR = Lc < OR = 4.00 lambda 0.25 lambda < OR = Ln < OR = 4.00 lambda 1 < OR = N < OR = 16 10* < OR = Alpha < OR = 16*0.90 lambda < OR = C < OR = 1.10 lambda wherein lambda free-space wavelength at design frequency phi o included cone angle D mouth diameter Lc truncated cone altitude Ln total axial length of helix N number of helix turns Alpha helix pitch angle C circumference of imaginary cylinder on which helix is wound.
Claim 3
Dependent Claim
30 words
An antenna as set forth in claim 1 wherein said antenna has the following parameters: phi * 45*D * 3 lambda Lc Lh 3 lambda N 10 Alpha 14*C lambda
References Cited (Backward Citations)
US2863148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |