Patent US3761938A successfully refreshed from Google Patents.
US3761938A
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Ferrite dipole antenna radiator
Assignee: United States Department of the Army
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Filing: 1972-11-30
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Granted: 1973-09-25
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Expires: 1992-11-30
Abstract
Abstract A ferrite rod is positioned between two parallel foil conductor strips. The strips terminate in perpendicular tabs which form a half-wavelength dipole antenna. Electromagnetic energy is coupled from free space to the ferrite rod by the dipole tabs. The energy propagates down the rod until reflected by a short circuit section connecting the ends of the conductor strips, opposite the tabs. After reflection, the energy propagates in a reverse direction. A coil carrying high frequency A.C. modulates the phase of the energy during propagation in both directions through the ferrite. When the energy is reflected back to the dispole tabs, the phase modulated energy is radiated to free space.
Inventors
- 👤 F Reggia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:43
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/44; H01Q3/46; H01Q13/00; H01Q13/20; H01Q13/24; H01Q3/26; H01Q3/30; H01Q3/34; H01Q3/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A ferrite dipole antenna radiator comprising: means having a high dielectric constant centrally positioned in the radiator for concentrating electromagnetic energy propagation therealong; parallel boundary planes disposed in spaced parallel relationship from the high dielectric constant means; conductor means connecting the boundary planes for reflecting the energy impinging thereon after propagation along the high dielectric constant means; and dipole means connected to the outward ends of the planes for radiating the reflected energy back into space.
Claim 2
Dependent Claim
76 words
A ferrite dipole antenna radiator comprising: means having a high dielectric constant centrally positioned in the radiator for concentrating electromagnetic energy propagation therealong; parallel boundary planes disposed in spaced parallel relationship from the high dielectric constant means; conductor means connecting the boundary planes for reflecting the energy impinging thereon after propagation along the high dielectric constant means; and dipole means connected to the outward ends of the planes for radiating the reflected energy back into space.
Claim 3
Dependent Claim
34 words
The structure defined in claim 1 together with means having a low dielectric constant located between the high dielectric constant means and the planes for restricting energy propagation along the high dielectric constant means.
Claim 4
Dependent Claim
17 words
The subject matter defined in claim 2 wherein the high dielectric constant means comprises a ferrite rod.
Claim 5
Dependent Claim
24 words
The subject matter of claim 3 wherein the boundary planes are characterized by fLat portions of conductor foil which articulate to the conductor means.
Claim 6
Dependent Claim
29 words
The subject matter of claim 4 wherein the dipole means are characterized by conductor tabs extending perpendicularly from the outward ends of the flat portions of the conductor foil.
Claim 7
Dependent Claim
19 words
The structure of claim 5 wherein the low dielectric constant means comprises an insulator body of foam plastic material.
Claim 8
Dependent Claim
49 words
The structure of claim 6 together with a coil transversely encircling the boundary planes and the ferrite rod, the coil carrying AC energization therein for creating a magnetic field that interacts with the propagating energy to cause phase modulation of the energy as radiated back out to free space.
Claim 9
Dependent Claim
50 words
The structure of claim 6 together with at least one permanent magnet mounted adjacent a boundary plane in a direction generally parallel with the rod for subjecting the propagated energy to a fixed magnetic field which causes a fixed phase shift of the propagated energy as radiated to free space.
Claim 10
Dependent Claim
24 words
The structure of claim 8 wherein the magnet is adjustably mounted with respect to the ferrite rod to effect an adjustable fixed phase shift.
Claim 11
Dependent Claim
32 words
The structure of claim 9 wherein a plurality of generally parallel magnets are adjustably mounted with respect to the ferrite rod for maximizing distribution of the fixed magnetic field around the rod.
References Cited (Backward Citations)
US2994084A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |