Patent US5838283A successfully refreshed from Google Patents.
US5838283A
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Loop antenna for radiating circularly polarized waves
Assignee: Nippon Antenna Co Ltd
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Filing: 1996-01-18
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Granted: 1998-11-17
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Expires: 2016-01-18
Abstract
Abstract A loop antenna for a circularly polarized wave can operate in a wide frequency range and can be simply constructed. A radiating power fed to a feeding point via a coaxial line and a feeder conductor is transmitted through an I-shape conductor to a C-type loop element disposed in spaced facing relation to a ground plane. By the action of a cutoff part formed on the C-type loop element, the C-type loop element radiates a circularly polarized wave. An angle of between 35° and 45° formed by the I-shape conductor and the cutoff part.
Inventors
- 👤 Hisamatsu Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:55
CPC Classifications
H; H01; H01Q; H01Q7/00; H01Q11/00; H01Q11/12; H01Q11/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A loop antenna for radiating a circularly polarized wave comprising: a ground plane; a C-type loop element having a cutoff part; and an I-shape conductor having one end connected to the C-type loop element and another end served as a feeding point, said I-shape conductor extending in a radial direction of the C-type loop element, said C-type loop element being located in a plane that is parallel to said ground plane with a predetermined space being provided between said ground plane and the parallel plane in which said C-type loop antenna is located, the I-shaped conductor being at an angle to the cutoff part on the C-type loop element which angle is about ±35°˜±45°° or about ±135°˜±145°.
Claim 2
Dependent Claim
117 words
A loop antenna for radiating a circularly polarized wave comprising: a ground plane; a C-type loop element having a cutoff part; and an I-shape conductor having one end connected to the C-type loop element and another end served as a feeding point, said I-shape conductor extending in a radial direction of the C-type loop element, said C-type loop element being located in a plane that is parallel to said ground plane with a predetermined space being provided between said ground plane and the parallel plane in which said C-type loop antenna is located, the I-shaped conductor being at an angle to the cutoff part on the C-type loop element which angle is about ±35°˜±45°° or about ±135°˜±145°.
Claim 3
Dependent Claim
30 words
A loop antenna for circularly polarized wave according to claim 1, wherein the circumferential length of the C-type loop element is about 1.0λ˜1.5λ, where λ is a natural space wavelength.
Claim 4
Dependent Claim
34 words
A loop antenna for circularly polarized wave according to claim 2, wherein said predetermined space between the C-type loop element and the ground plane is about 0.05λ˜0.26λ, where λ is a natural space wavelength.
Claim 5
Dependent Claim
28 words
A loop antenna for circularly polarized wave according to claim 3, wherein the length of the I-shape conductor is about 0λ˜0.47λ, where λ is a natural space wavelength.
Claim 6
Dependent Claim
28 words
A loop antenna for circularly polarized wave according to claim 2, wherein the length of the I-shape conductor is about 0λ˜0.47λ, where λ is a natural space wavelength.
Claim 7
Dependent Claim
36 words
A loop antenna for radiating a circularly polarized wave according to claim 1, wherein said predetermined space between the C-type loop element and the ground plane is about 0.05λ˜0.26λ, where λ is a natural space wavelength.
Claim 8
Dependent Claim
30 words
A loop antenna for radiating a circularly polarized wave according to claim 6, wherein the length of the I-shape conductor is about 0λ˜0.47λ, where λ is a natural space wavelength.
Claim 9
Dependent Claim
30 words
A loop antenna for radiating a circularly polarized wave according to claim 1, wherein the length of the I-shape conductor is about 0λ˜0.47λ, where λ is a natural space wavelength.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-16 | 2002-05-18 | 2002-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-16 | 2006-05-18 | 2006-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-16 | 2010-05-18 | 2010-11-17 | $7700.00 | Window Closed / Lapsed |