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US3696438A
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Log-periodic scaled directional coupler feed line for antennas
Assignee: University of Illinois at Urbana-Champaign
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Filing: 1969-01-21
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Granted: 1972-10-03
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Expires: 1989-01-21
Abstract
Abstract Log-periodic dipole, folded dipole, monopole, folded monopole, and slot arrays fed by a pair of coupled transmission lines which form a log-periodically scaled directional coupler feeder. Alternating scaled sections of coupled and uncoupled lines are employed as a feed unit for antenna arrays, with radiating elements provided in the uncoupled sections.
Inventors
- 👤 Paul G Ingerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:04
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/10; H01P; H01P5/00; H01P5/12; H01P5/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A wide band antenna comprising: a series of substantially log-periodically scaled radiating elements; and feeder means coupled to said radiating elements, including a series of interconnected, alternating coupled and uncoupled substantially log-periodically scaled feeder sections extending outwardly from a feed point, each of said feeder sections comprising two distinct transmission means, said radiating elements coupled to only one of said transmission means at said uncoupled feeder sections; and the other of said transmission means connected to said feed point.
Claim 2
Dependent Claim
79 words
A wide band antenna comprising: a series of substantially log-periodically scaled radiating elements; and feeder means coupled to said radiating elements, including a series of interconnected, alternating coupled and uncoupled substantially log-periodically scaled feeder sections extending outwardly from a feed point, each of said feeder sections comprising two distinct transmission means, said radiating elements coupled to only one of said transmission means at said uncoupled feeder sections; and the other of said transmission means connected to said feed point.
Claim 3
Dependent Claim
32 words
A wide band antenna as claimed in claim 1, wherein said feeder means comprises two two-wire transmission lines having closely coupled line sections alternating with and connected to relatively uncoupled line sections.
Claim 4
Dependent Claim
85 words
A wide band antenna as claimed in claim 2, wherein the electrical lengths of said coupled and uncoupled line sections are defined by phi n and theta n, the electrical lengths of preceding coupled and uncoupled line sections toward said feed point being defined by phi n 1 and theta n 1, respectively, and wherein each respective line section is scaled from the corresponding line section by a scaling factor, Tau 1, where Tau 1 phi n 1/ phi n theta n 1/ theta n.
Claim 5
Dependent Claim
28 words
A wide band antenna as claimed in claim 3, wherein each succeeding radiating element is related to the preceding element by means of a scaling factor Tau 2.
Claim 6
Dependent Claim
32 words
A wide band antenna as claimed in claim 1, wherein said feeder means comprises two strip transmission lines having closely coupled line sections alternating with and connected to relatively uncoupled line sections.
Claim 7
Dependent Claim
68 words
A log-periodically scaled directional coupled feed line for feeding antenna elements comprising a series of interconnected, alternating coupled and uncoupled substantially log-periodically scaled feeder sections extending from a feed point, each of said feeder sections comprising two distinct transmission means, said antenna elements coupled to only one of said transmission means at said uncoupled feeder sections, and the other of said transmission means connected to said feed point.
Claim 8
Dependent Claim
68 words
A log-periodically scaled directional coupled feed line for feeding antenna elements comprising a series of interconnected, alternating coupled and uncoupled substantially log-periodically scaled feeder sections extending from a feed point, each of said feeder sections comprising two distinct transmission means, said antenna elements coupled to only one of said transmission means at said uncoupled feeder sections, and the other of said transmission means connected to said feed point.
Claim 9
Dependent Claim
35 words
A log-periodically scaled directional coupler feed line as claimed in claim 6, wherein said feeder sections comprise two two-wire transmission lines having closely coupled line sections alternating with and connected to relatively uncoupled line sections.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |