US4366485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric tube antenna encased in dielectric
Assignee: ZS ELECTRONIQUES (PROPRIETARY) Ltd
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Filing: 1980-11-05
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Granted: 1982-12-28
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Expires: 2000-11-05
Abstract
Abstract An antenna comprises a conductor having two electrically connected sections spaced apart from each other by a dielectric material, and a directional coupler connected to the feed point, the sections being connected at a position remote from the feed point.
Inventors
- 👤 Alec J. Hodgkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:39
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/52; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
An antenna comprising: a conductor formed by two tubular sections, one of said tubular sections being of smaller diameter than the other and being located concentrically within the other, the ends of the two tubular sections being electrically connected at one pair of ends thereof remote from the feed point of the antenna, and there being a directional coupler connected to the feed point, the coupler being adapted to have a low attenuation in the direction of feed and a high attenuation of reflected waves in the reverse direction.
Claim 2
Dependent Claim
89 words
An antenna comprising: a conductor formed by two tubular sections, one of said tubular sections being of smaller diameter than the other and being located concentrically within the other, the ends of the two tubular sections being electrically connected at one pair of ends thereof remote from the feed point of the antenna, and there being a directional coupler connected to the feed point, the coupler being adapted to have a low attenuation in the direction of feed and a high attenuation of reflected waves in the reverse direction.
Claim 3
Dependent Claim
22 words
An antenna as claimed in claim 1 in which the electrical connection comprises a radially located bolt through the tubular section walls.
Claim 4
Dependent Claim
21 words
An antenna as claimed in claim 1 or 2 in which the space between the sections is filled with dielectric material.
Claim 5
Dependent Claim
29 words
An antenna as claimed in claim 1 or 2 in which the space between the sections, and the tubular space within the innermost section, is filled with dielectric material.
Claim 6
Dependent Claim
23 words
An antenna as claimed in claim 1 in which the outer wall of the outer tubular section has a coating of dielectric material.
Claim 7
Dependent Claim
17 words
An antenna as claimed in claim 5 in which the dielectric material is a polypropylene plastics material.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |