US3665476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna
Assignee: Singer Co
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Filing: 1965-12-01
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Granted: 1972-05-23
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Expires: 1985-12-01
Abstract
Abstract A receiving antenna for submarines wherein tunnel diodes are inductively coupled to a plurality of ferrite rod by a coupling link. The tunnel diodes are back-biased by a biasing circuit to establish operation in the negative resistance region. Bias current and coupling are adjusted to provide cancellation of the major portion of the ferrite core losses and copper losses of the main turning winding.
Inventors
- 👤 Allen R Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:04
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/24; H01Q23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A receiving antenna for use in submarines comprising in combination: a plurality of ferrite rods projecting from the structure of a submarine; a tunnel diode inductively coupled to each rod by at least one turn of wire around the rod; a back biasing circuit connected to each of said tunnel diodes to establish operation in the negative resistance region of said diodes, said back biasing circuits including power source means, a fixed bias resistor in series with said power source means and said tunnel diode and a variable resistor in parallel with the fixed bias resistor and in series between said power source means and tunnel diode; a main tuning winding around at least one rod, including a plurality of inductance turns of wire around said rod and a tuning capacitor in parallel with said inductance turns; and, a receiver line coupled to said one rod by at least one coupling turn.
Claim 2
Dependent Claim
152 words
A receiving antenna for use in submarines comprising in combination: a plurality of ferrite rods projecting from the structure of a submarine; a tunnel diode inductively coupled to each rod by at least one turn of wire around the rod; a back biasing circuit connected to each of said tunnel diodes to establish operation in the negative resistance region of said diodes, said back biasing circuits including power source means, a fixed bias resistor in series with said power source means and said tunnel diode and a variable resistor in parallel with the fixed bias resistor and in series between said power source means and tunnel diode; a main tuning winding around at least one rod, including a plurality of inductance turns of wire around said rod and a tuning capacitor in parallel with said inductance turns; and, a receiver line coupled to said one rod by at least one coupling turn.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |