US5164734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar target with delayed reply means
Assignee: Individual
•
Filing: 1991-10-07
•
Granted: 1992-11-17
•
Expires: 2011-10-07
Abstract
Abstract An active radar target device is disclosed. This device contains a means receiving a radar signal, a means for decreasing the frequency of the radar signal received, at least one means for delaying the reduced frequency radar signal, means for increasing the frequency of the delayed signal, and means of modulating the delayed signal. The modulated and delayed signal is transmitted to an antenna, from which it may be radiated to a radar detector.
Inventors
- 👤 Duane G. Fredericks
- 👤 Herbert W. Rosebrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:10
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S13/00; G01S13/74; G01S13/76; G01S13/767; G01S13/78; G01S13/88; G01S13/91; G01S13/913; G01S7/4082; G01S7/4095; H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/2682
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
232 words
An apparatus for producing an electromagnetic signal, wherein said apparatus is comprised of: (a) means for receiving a radar signal which has a frequency of from about 1 to about 94 gigacycles; (b) means for decreasing the frequency of said radar signal by at least about 65 percent, thereby producing a reduced frequency electromagnetic signal with a center frequency of from about 700 to about 1,300 megacycles; (c) delay means for delaying said reduced frequency electromagnetic signal by at least about three radar pulse widths and from about 5 to about 100 microseconds, thereby producing a delayed electromagnetic signal, wherein: 1. said delay means is comprised of a first delay circuit and a second delay circuit, 2. each of said first delay circuit and said second delay circuit is substantially non-attenuating, and 3. each of said first delay circuit and said second delay circuit is substantially non-dispersive; (d) means for increasing the frequency of said delayed electromagnetic signal to produce a delayed electromagnetic wave with an increased frequency which is substantially identical to the frequency of said radar signal, thereby producing a delayed radar signal with a frequency of from about 1 to about 94 gigacycles; (e) means for modulating said delayed radar signal with a frequency of from about 1 to about 94 gigacycles, thereby producing a modulated, delayed radar signal; and (f) means for transmitting said modulated, delayed radar signal.
Claim 2
Independent Claim
232 words
An apparatus for producing an electromagnetic signal, wherein said apparatus is comprised of: (a) means for receiving a radar signal which has a frequency of from about 1 to about 94 gigacycles; (b) means for decreasing the frequency of said radar signal by at least about 65 percent, thereby producing a reduced frequency electromagnetic signal with a center frequency of from about 700 to about 1,300 megacycles; (c) delay means for delaying said reduced frequency electromagnetic signal by at least about three radar pulse widths and from about 5 to about 100 microseconds, thereby producing a delayed electromagnetic signal, wherein: 1. said delay means is comprised of a first delay circuit and a second delay circuit, 2. each of said first delay circuit and said second delay circuit is substantially non-attenuating, and 3. each of said first delay circuit and said second delay circuit is substantially non-dispersive; (d) means for increasing the frequency of said delayed electromagnetic signal to produce a delayed electromagnetic wave with an increased frequency which is substantially identical to the frequency of said radar signal, thereby producing a delayed radar signal with a frequency of from about 1 to about 94 gigacycles; (e) means for modulating said delayed radar signal with a frequency of from about 1 to about 94 gigacycles, thereby producing a modulated, delayed radar signal; and (f) means for transmitting said modulated, delayed radar signal.
Claim 3
Dependent Claim
23 words
The apparatus as recited in claim 1, wherein said means for decreasing the frequency of said radar signal is comprised of an oscillator.
Claim 4
Dependent Claim
25 words
The apparatus as recited in claim 2, wherein said means for decreasing the frequency of said radar signal is comprised of a double balanced mixer.
Claim 5
Dependent Claim
28 words
The apparatus as recited in claim 3, wherein each of said first delay circuit and said second delay circuit is comprised of an amplifier and a delay module.
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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |