Patent US3671868A successfully refreshed from Google Patents.
US3671868A
Expired / Lapsed
US
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Superregenerative microwave receiver
Assignee: Bendix Corp
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Filing: 1970-01-21
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Granted: 1972-06-20
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Expires: 1990-01-21
Abstract
Abstract A highly sensitive superregenerative microwave receiver is disclosed having a special utility for radar altimeters. A tunnel diode oscillator-amplifier section is arranged on a stripline board one wavelength square with the housing forming the ground plane and with the tunnel diode centered on the board. A threaded member in the top of the housing cooperates with a conductor track on the stripline board to tune the oscillator resonant circuit. A detector and self-test stripline board is positioned in another compartment of the housing separated from the oscillator-amplifier board by means of a bulkhead but connected to said board by means of a feed-through connector. This board contains the radio frequency input port and includes a stripline coupler arrangement to connect the radio frequency signal to the detector diode. A stripline filter connected between the radio frequency input and the oscillator-amplifier provides both second harmonic rejection and d. c. blocking to prevent any d. c. component of the modulating pulse from reaching the detector. A self-test capability is provided including a pair of diode switching circuits which make it possible to effectively disconnect the received radio frequency signal and connect a test radio frequency signal to the detector.
Inventors
- 👤 Bobby J Sanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:56
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/12; H; H03; H03D; H03D11/00; H03D2200/00; H03D2200/0041; H03D2200/0086
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
183 words
A superregenerative microwave receiver comprising: stripline means including conductor means, dielectric board supporting means and housing means supporting said stripline means serving as ground plane means associated with said conductor and dielectric board means, a semiconductor device having a negative resistance characteristic associated with said conductor means, said conductor means including a track for receiving an input pulse with said track including inductance means positioned adjacent said semiconductor device and a track including capacitance means, filter means connected to said capacitance means, a detector diode including inductive tuning means, an output port and a first conductor track connecting said detector diode with said output port, a radio frequency input port and a second conductor track connecting said input port with said filter means, said first and second conductor tracks including means for coupling radio frequency input signals to said detector diode; said housing means including a bulkhead dividing said housing means into two compartments, one of said compartments containing said negative resistance semiconductor device substantially centered therein, said input pulse track and said adjustable capacitance means, said compartment being approximately one wavelength square.
Claim 2
Dependent Claim
183 words
A superregenerative microwave receiver comprising: stripline means including conductor means, dielectric board supporting means and housing means supporting said stripline means serving as ground plane means associated with said conductor and dielectric board means, a semiconductor device having a negative resistance characteristic associated with said conductor means, said conductor means including a track for receiving an input pulse with said track including inductance means positioned adjacent said semiconductor device and a track including capacitance means, filter means connected to said capacitance means, a detector diode including inductive tuning means, an output port and a first conductor track connecting said detector diode with said output port, a radio frequency input port and a second conductor track connecting said input port with said filter means, said first and second conductor tracks including means for coupling radio frequency input signals to said detector diode; said housing means including a bulkhead dividing said housing means into two compartments, one of said compartments containing said negative resistance semiconductor device substantially centered therein, said input pulse track and said adjustable capacitance means, said compartment being approximately one wavelength square.
Claim 3
Dependent Claim
23 words
A superregenerative microwave receiver as set forth in claim 1 wherein said track including capacitance means includes means for adjusting the capacitance thereof.
Claim 4
Dependent Claim
30 words
A superregenerative microwave receiver as set forth in claim 1 whereIn the other of said compartments includes said detector diode, said filter means and said first and second conductor tracks.
Claim 5
Dependent Claim
59 words
A superregenerative microwave receiver as set forth in claim 3 wherein said other compartment further contains diodes switch means and associated stripline conductor means for disconnecting the signal at said input port from said coupling means and additional diode switching means and associated stripline conductor means are provided to connect a radio frequency test signal to said coupling means.
Claim 6
Dependent Claim
42 words
A superregenerative microwave receiver as set forth in claim 1 wherein said input pulse track has an input port connected to said track and a quarter wavelength tuning stub is connected to said track intermediate said input port and said inductance means.
Claim 7
Dependent Claim
40 words
A superregenerative microwave receiver as set forth in claim 1 wherein said semiconductor device is a tunnel diode and tuning means are provided in association with said ground plane means and said stripline capacitor track for adjusting the capacitance thereof.
Claim 8
Dependent Claim
54 words
A superregenerative microwave receiver as set forth in claim 1 wherein first diode switch means is connected to said first conductor track for disconnecting the signal at said radio frequency input port from said coupling means and additional diode switching means are provided to connect a radio frequency test signal to said coupling means.
Claim 9
Dependent Claim
247 words
A superregenerative microwave receiver comprising: a housing including a bulkhead dividing said housing into a first compartment and a second compartment, a first stripline board in said first compartment and a second stripline board in said second compartment, said housing acting as a ground plane for the conductors on said boards; said first stripline board cooperating with said housing to provide an oscillator section, said oscillator including a tunnel diode positioned substantially at the center of said board, a stripline inductor track adjacent said tunnel diode, a stripline capacitor track positioned adjacent said diode including adjustment means carried in said housing and cooperating with said capacitor track to vary its capacitance, a coaxial connector attached to said housing for receiving a pulse input, conductor means connecting said coaxial connector to said stripline inductor, and a quarter wave open-ended stub connected to said conductor between said connector and said inductor track; said second stripline board cooperating with said housing to provide a detector section including a stripline conductor attached to said stripline capacitor track through said bulkhead, a filter formed in said stripline conductor, a radio frequency port and a second stripline conductor connecting said port with said filter, a detector diode and stripline means coupling said detector diode to said second stripline conductor, inductive tuning means connected to said detector diode, a video output port connected to said housing and conductor means forming part of said stripline means connecting said detector diode to said video output port.
Claim 10
Dependent Claim
247 words
A superregenerative microwave receiver comprising: a housing including a bulkhead dividing said housing into a first compartment and a second compartment, a first stripline board in said first compartment and a second stripline board in said second compartment, said housing acting as a ground plane for the conductors on said boards; said first stripline board cooperating with said housing to provide an oscillator section, said oscillator including a tunnel diode positioned substantially at the center of said board, a stripline inductor track adjacent said tunnel diode, a stripline capacitor track positioned adjacent said diode including adjustment means carried in said housing and cooperating with said capacitor track to vary its capacitance, a coaxial connector attached to said housing for receiving a pulse input, conductor means connecting said coaxial connector to said stripline inductor, and a quarter wave open-ended stub connected to said conductor between said connector and said inductor track; said second stripline board cooperating with said housing to provide a detector section including a stripline conductor attached to said stripline capacitor track through said bulkhead, a filter formed in said stripline conductor, a radio frequency port and a second stripline conductor connecting said port with said filter, a detector diode and stripline means coupling said detector diode to said second stripline conductor, inductive tuning means connected to said detector diode, a video output port connected to said housing and conductor means forming part of said stripline means connecting said detector diode to said video output port.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |