Patent US4087823A successfully refreshed from Google Patents.
US4087823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband dipole antenna system having three collinear radiators
Assignee: Chu Associates Inc
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Filing: 1976-03-19
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Granted: 1978-05-02
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Expires: 1996-03-19
Abstract
Abstract This disclosure deals with a three-element unit array (or stacked groups of the same) that enables the use of very large length-to-diameter dipole elements to cover broad frequency bands, greater than 2:1 in frequency ratio, by novel feed structures exciting the element gaps.
Inventors
- 👤 Ivan Faigen
- 👤 Ahmet Ergene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:20
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; H01Q21/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
A broadband antenna having, in combination, three successive in-line cylindrical antenna elements comprising first, center, and third elements, with gaps defined between the first and center, and center and third elements; and coaxial feed-line means disposed along the elements with the inner line thereof extending across the gap between the first and center elements, and the outer line thereof extending along the center element to form a transmission line section therewith and then connecting with the third element, said outer line being insulated from said center element for radio frequency energy in the operating frequency band; the length of the in-line elements being large compared with the cross-section of the elements.
Claim 2
Dependent Claim
111 words
A broadband antenna having, in combination, three successive in-line cylindrical antenna elements comprising first, center, and third elements, with gaps defined between the first and center, and center and third elements; and coaxial feed-line means disposed along the elements with the inner line thereof extending across the gap between the first and center elements, and the outer line thereof extending along the center element to form a transmission line section therewith and then connecting with the third element, said outer line being insulated from said center element for radio frequency energy in the operating frequency band; the length of the in-line elements being large compared with the cross-section of the elements.
Claim 3
Dependent Claim
29 words
An antenna as claimed in claim 1 and in which each element is adjusted to a length substantially one quarter the wavelength near the center of the frequency band.
Claim 4
Dependent Claim
47 words
An antenna as claimed in claim 2 and in which dielectric means is disposed between the center cylindrical element and the outer line extension therealong to provide a transmission line length closer to one-half said wavelength but an outer surface radiating length of said one quarter wavelength.
Claim 5
Dependent Claim
65 words
An antenna as claimed in claim 1 and in which a coaxial feed stub is provided near the end of the center element adjacent to the first element, with said inner line of the coaxial feed-line means being an extension of the inner conductor of said feed stub and insulated from said first and center elements for radio frequency energy in the operating frequency band.
Claim 6
Dependent Claim
47 words
An antenna as claimed in claim 4 and in which a coaxial matching stub is provided near the end of the center element adjacent the third element with an inner conductor extension thereof across the gap between the center and third elements terminating on the third element.
Claim 7
Dependent Claim
20 words
An antenna as claimed in claim 1 and in which said coaxial feed line is disposed axially within said elements.
Claim 8
Dependent Claim
60 words
An antenna as claimed in claim 6 and in which the connection of the center transmission line section to the third element is effected by an extension of the coaxial feed-line outer line through the third element with a conductive connection of the third element to the outer line at the end of the third element adjacent the center element.
Claim 9
Dependent Claim
42 words
An antenna as claimed in claim 1 and in which at least part of the outer line of the said coaxial feed-line means external to said elements is continuously coated with a dielectric layer containing ferrite particles to reduce extraneous line currents.
Claim 10
Dependent Claim
23 words
An antenna as claimed in claim 1 and in which the length-to-diameter ratio of the elements is from several tens-to-one to substantially 70-to-one.
Claim 11
Dependent Claim
27 words
An antenna as claimed in claim 1 and in which a plurality of sets of said three in-line elements are stacked to provide a vertical multi-channel system.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |