US4617571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuned band-switching loop antenna
Assignee: TECHNIQUE D'APPLICATION ET DE RECHERCHE ELECTRONIQUE Ste
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Filing: 1984-04-24
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Granted: 1986-10-14
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Expires: 2004-04-24
Abstract
Abstract The invention relates to a loop antenna tuned by means of a variable capacitor. The antenna includes, in parallel with the variable capacitor (4), a switchable state variable inductor (11). The invention is particularly applicable to antennas for HF radio links at powers of up to 1 kW.
Inventors
- 👤 Jean Choquer
- 👤 Thierry Gartner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:35
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q7/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
A loop antenna comprising: two arms extending in a first vertical plane and interconnected at their top ends to form a loop by a variable capacitor; feeding and coupling means to make said loop radiate electromagnetic energy; an inductor connected in parallel with said variable capacitor, said inductor being formed by a two-wire line having an open end which can be short circuited; and switching means for selectively short circuiting said open end of said two-wire line.
Claim 2
Dependent Claim
77 words
A loop antenna comprising: two arms extending in a first vertical plane and interconnected at their top ends to form a loop by a variable capacitor; feeding and coupling means to make said loop radiate electromagnetic energy; an inductor connected in parallel with said variable capacitor, said inductor being formed by a two-wire line having an open end which can be short circuited; and switching means for selectively short circuiting said open end of said two-wire line.
Claim 3
Dependent Claim
57 words
The loop antenna of claim 1, wherein said two-wire line extends in a second vertical plane perpendicular to said first vertical plane, the top ends of the wires in said two-wire line being connected one to each end of said variable capacitor and the bottom ends of said wires forming said open end of said two-wire line.
Claim 4
Dependent Claim
52 words
The loop antenna of claim 2, wherein said two-wire line is made of a vertically oriented folded metal tube, said bottom ends of said wires being formed from a cut through the bottom branch of said folded metal tube, said cut being capable of being selectively short circuited by said switching means.
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) | 1989-10-13 | 1990-04-14 | 1990-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-13 | 1994-04-14 | 1994-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-13 | 1998-04-14 | 1998-10-14 | $7700.00 | Window Closed / Lapsed |