Patent US3623091A successfully refreshed from Google Patents.
US3623091A
Expired / Lapsed
US
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Passive responder
Assignee: Avco Corp
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Filing: 1970-01-26
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Granted: 1971-11-23
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Expires: 1990-01-26
Abstract
Abstract A passive responder utilizing a cylindrical waveguide and a dielectric rod element for receiving electromagnetic wave energy from an interrogating radar and for reflecting such energy back to the radar. A shorting element is used in conjunction with a pair of orthogonally mounted diode elements, all of which are positioned with the waveguide, such diode elements being suitably switched as by a multivibrator circuit to provide a phase modulated return signal. The diodes are mounted at a distance equal to an odd multiple of quarter wavelengths from the shorting element to produce a 180* phase shift of the incoming and reflected signal so as to produce a modulated return signal of the suppressed carrier type.
Inventors
- 👤 John J Mayo Jr
- 👤 Robert L Cavanaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:29
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/756
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A passive responder comprising waveguide means for permitting the transmission of electromagnetic energy therein in either direction, the wavelength of said electromagnetic energy lying within a range having a specified center value; shorting means mounted within said waveguide means; dielectric means partially inserted into said waveguide at one end thereof; diode means mounted within said waveguide means at a specified distance from said shorting means and at a position between said shorting means and said dielectric means, said distance being substantially equal to an odd multiple of quarter wavelengths at said center wavelength value; circuit means mounted within said waveguide and connected to said diode means for controlling the operation of said diode means; whereby an electromagnetic energy wave received at said one end of said waveguide means is modulated by the operation of said diode means and said circuit means, and said modulated electromagnetic energy wave is reradiated from said one end thereof.
Claim 2
Dependent Claim
154 words
A passive responder comprising waveguide means for permitting the transmission of electromagnetic energy therein in either direction, the wavelength of said electromagnetic energy lying within a range having a specified center value; shorting means mounted within said waveguide means; dielectric means partially inserted into said waveguide at one end thereof; diode means mounted within said waveguide means at a specified distance from said shorting means and at a position between said shorting means and said dielectric means, said distance being substantially equal to an odd multiple of quarter wavelengths at said center wavelength value; circuit means mounted within said waveguide and connected to said diode means for controlling the operation of said diode means; whereby an electromagnetic energy wave received at said one end of said waveguide means is modulated by the operation of said diode means and said circuit means, and said modulated electromagnetic energy wave is reradiated from said one end thereof.
Claim 3
Dependent Claim
16 words
A passive responder in accordance with claim 1, wherein said waveguide means includes a circular waveguide.
Claim 4
Dependent Claim
20 words
A passive responder in accordance with claim 1, wherein said diode means are mounted orthogonally with respect to each other.
Claim 5
Dependent Claim
32 words
A passive responder in accordance with claim 2, wherein said dielectric means is in the form of a dielectric rod having a cross-sectional area substantially equal to that of said circular waveguide.
Claim 6
Dependent Claim
46 words
A passive responder in accordance with claim 4, wherein the dimensions of said dielectric rod are selected to provide a phase velocity for operation in the HE11 mode, the diameter of said rod corresponding to the diameter of said cylindrical waveguide operating in the TE11 mode.
Claim 7
Dependent Claim
40 words
A passive responder in accordance with claim 4, wherein the end of said dielectric rod which is inserted into said waveguide is tapered to provide an effective transition for the transmission of said energy between said rod and said waveguide.
Claim 8
Dependent Claim
32 words
A passive responder in accordance with claim 4, wherein the ends of said dielectric rod are substantially flat and the end inserted in said waveguide is mounted substantially adjacent said diode means.
Claim 9
Dependent Claim
35 words
A passive responder in accordance with claim 1 wherein said circuit means includes an oscillator circuit mounted within said waveguide and power supply means mounted within said waveguide for supplying power to said oscillator circuit.
Claim 10
Dependent Claim
55 words
A passive responder in accordance with claim 1 wherein said waveguide means includes a circular waveguide, said dielectric means being partially inserted therein; a rectangular waveguide, said shorting means, said diode means, and said circuit means being mounted therein; and further waveguide means for providing a transition from said circular waveguide to said rectangular waveguide.
Claim 11
Dependent Claim
33 words
A passive responder in accordance with claim 1, wherein said shorting means is adjustably mounted within said waveguide means so as to adjust said distance between said shorting means and said diode means.
References Cited (Backward Citations)
US3159836A
Cited
US3154784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |