Patent US3750180A successfully refreshed from Google Patents.
US3750180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic antenna with time variations of core permeability
Assignee: Panasonic Holdings Corp
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Filing: 1972-07-21
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Granted: 1973-07-31
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Expires: 1992-07-21
Abstract
Abstract An antenna system using a magnetic core provided with coils wound thereon such as to cause time variations of the permeability of the core itself is disclosed. With the time variations of the core permeability the inductances of the antenna coil and output coil wound on the core is changed for parametric amplification of the reception signal to obtain amplified antenna output. Also, by using a plurality of such antenna systems an array antenna having desired and controllable directional characteristics are obtained.
Inventors
- 👤 K Fujimoto
- 👤 K Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:18
CPC Classifications
H; H03; H03F; H03F7/00; H03F7/02; H01; H01F; H01F21/00; H01F21/02; H01F21/08; H01F29/00; H01F29/14; H01F29/146; H01Q; H01Q3/00; H01Q3/26; H01Q7/00; H01Q7/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
An antenna system comprising an electromagnetic wave reception magnetic core formed with a plurality of apertures, a first coil serving as pumping coil for changing the permeability of said magnetic core, said first coil being wound on part of said core between adjacent ones of said apertures, and two second coils linked by magnetic flux produced by said pumping coil, said second coils being wound such that their windings are perpendicular to the winding of said first coil, one of said second coils being wound on said core such that its all winding passes through said apertures, the other of said second coils having some of its winding wound around the whole body of said core and the other of its winding passed through said apertures.
Claim 2
Dependent Claim
126 words
An antenna system comprising an electromagnetic wave reception magnetic core formed with a plurality of apertures, a first coil serving as pumping coil for changing the permeability of said magnetic core, said first coil being wound on part of said core between adjacent ones of said apertures, and two second coils linked by magnetic flux produced by said pumping coil, said second coils being wound such that their windings are perpendicular to the winding of said first coil, one of said second coils being wound on said core such that its all winding passes through said apertures, the other of said second coils having some of its winding wound around the whole body of said core and the other of its winding passed through said apertures.
Claim 3
Dependent Claim
28 words
An antenna system according to claim 1, which further comprises at least one permanent magnet affixed to said magnetic core for producing a bias field in said core.
Claim 4
Dependent Claim
58 words
An array antenna consisting of a plurality of antenna elements, each of which is the antenna system as claimed in claim 1, in which means is connected with said first coil for independently controlling the amplitude and phase of a pumping current flowing through said first coil thereby obtaining desired and controllable directional characteristics of the array antenna.
Claim 5
Dependent Claim
43 words
An antenna system according to claim 2, which further comprises non-magnetic spacers individually provided between said respective permanent magnets and said core, said spacers serving to render variable the intensity of the bias field set up by said magnets in said magnetic core.
Claim 6
Dependent Claim
58 words
An array antenna consisting of a plurality of antenna elements, each of which is the antenna system as claimed in claim 2, in which means is connected with said first coil for independently controlling the amplitude and phase of a pumping current flowing through said first coil thereby obtaining desired and controllable directional characteristics of the array antenna.
References Cited (Backward Citations)
US3665476A
Cited
US3564551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |