US3900849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conical unbalanced spiral radar modulator
Assignee: United States Department of the Air Force
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Filing: 1973-10-17
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Granted: 1975-08-19
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Expires: 1993-10-17
Abstract
Abstract A radar reflecting and modulating system using unbalanced spiral conductors. A pair of conductors are wound and interleaved on a conical surface with one spiral terminating in a zigzag configuration at the base of the conical surface. The conductors are connected to a variable impedance load which is controlled by a pair of voltage sources whose outputs have different time dependence. The control voltages provide bias to interconnected varactors which are connected to the spiral conductors.
Inventors
- 👤 William G Scott
- 👤 John H Zickgraf
- 👤 Dennis A Petron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:21
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/756
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
A system for modulating and reflecting radar signals comprising: a. a conical surface; b. a first spiral conductor mounted on the conical surface; c. a second spiral conductor mounted on the conical surface interleaved between the first spiral conductor and having a zigzag configuration at the wide base of the conical surface; and d. a variable impedance load connecting the first and second spiral conductors and including 1. first and second sources of time varying voltages, 2. a first varactor having the terminals thereof inductively connected to the first voltage source, 3. a second varactor having the terminals thereof inductively connected to the first voltage source, 4. a third varactor having the terminals thereof inductively connected to the second voltage source, 5. first and second capacitors in series connecting the second and third varactors with the junction of the first and second capacitors being connected to one spiral conductor, and 6. a third capacitor connecting the first and third varactors with the junction of the third varactor and the third capacitor being connected to the other spiral conductor.
Claim 2
Independent Claim
178 words
A system for modulating and reflecting radar signals comprising: a. a conical surface; b. a first spiral conductor mounted on the conical surface; c. a second spiral conductor mounted on the conical surface interleaved between the first spiral conductor and having a zigzag configuration at the wide base of the conical surface; and d. a variable impedance load connecting the first and second spiral conductors and including 1. first and second sources of time varying voltages, 2. a first varactor having the terminals thereof inductively connected to the first voltage source, 3. a second varactor having the terminals thereof inductively connected to the first voltage source, 4. a third varactor having the terminals thereof inductively connected to the second voltage source, 5. first and second capacitors in series connecting the second and third varactors with the junction of the first and second capacitors being connected to one spiral conductor, and 6. a third capacitor connecting the first and third varactors with the junction of the third varactor and the third capacitor being connected to the other spiral conductor.
Claim 3
Dependent Claim
14 words
a first varactor having the terminals thereof inductively connected to the first voltage source,
Claim 4
Dependent Claim
14 words
a first varactor having the terminals thereof inductively connected to the first voltage source,
Claim 5
Dependent Claim
14 words
a second varactor having the terminals thereof inductively connected to the first voltage source,
Claim 6
Dependent Claim
14 words
a second varactor having the terminals thereof inductively connected to the first voltage source,
Claim 7
Dependent Claim
14 words
a third varactor having the terminals thereof inductively connected to the second voltage source,
Claim 8
Dependent Claim
14 words
a third varactor having the terminals thereof inductively connected to the second voltage source,
Claim 9
Dependent Claim
28 words
first and second capacitors in series connecting the second and third varactors with the junction of the first and second capacitors being connected to one spiral conductor, and
Claim 10
Dependent Claim
28 words
first and second capacitors in series connecting the second and third varactors with the junction of the first and second capacitors being connected to one spiral conductor, and
Claim 11
Dependent Claim
27 words
a third capacitor connecting the first and third varactors with the junction of the third varactor and the third capacitor being connected to the other spiral conductor.
Claim 12
Dependent Claim
27 words
a third capacitor connecting the first and third varactors with the junction of the third varactor and the third capacitor being connected to the other spiral conductor.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |