US4672379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doppler radar transceiver
Assignee: Individual
•
Filing: 1985-12-04
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Granted: 1987-06-09
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Expires: 2005-12-04
Abstract
Abstract A doppler radar transceiver comprising a transceiving module including a reflex circuit having a single transistor which simultaneously acts as both an oscillator and an amplifier. A capacitor and a resistor are provided in the transistor base element bias circuit to reduce the source impedance of the base bias current to said transistor in the doppler signal frequency band without effecting the radar frequency system of the transceiver.
Inventors
- 👤 Frank W. Bishop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:32
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/56
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
A doppler radar transceiver comprising a transceiving module including a reflex circuit having a single transistor which simultaneously acts as both an oscillator and an amplifier, characterized in that a capacitor and resistor are provided in a base element bias circuit of the transistor to reduce the source impedance of the base current to said transistor in the doppler signal frequency band without affecting a radar frequency system of the transceiver.
Claim 2
Dependent Claim
71 words
A doppler radar transceiver comprising a transceiving module including a reflex circuit having a single transistor which simultaneously acts as both an oscillator and an amplifier, characterized in that a capacitor and resistor are provided in a base element bias circuit of the transistor to reduce the source impedance of the base current to said transistor in the doppler signal frequency band without affecting a radar frequency system of the transceiver.
Claim 3
Dependent Claim
72 words
A doppler radar transceiver as defined in claim 1 wherein a DC biasing circuit for said transistor is arranged such that the base bias current of the transistor is derived from a voltage divider circuit via a receive stripline element, characterized in that said resistor is connected in series with said stripline element and said capacitor is connected in parallel with one of a number of resistors constituting said voltage divider circuit.
Claim 4
Dependent Claim
33 words
A doppler radar transceiver as defined in claim 2, characterized in that, the capacitive reactance of said capacitor at a required doppler frequency is less than one tenth the value of said resistor.
Claim 5
Dependent Claim
44 words
A doppler radar transceiver as defined in claim 3, characterized in that, a radiating stripline element is connected between the transistor collector terminal and a signal terminal of said transceiver, said radiating stripline element being adapted to emit electromagnetic radiation at a desired frequency.
References Cited (Backward Citations)
US2760000A
Cited
US3038068A
Cited
US3136951A
Cited
US3193777A
Cited
DE2424278A1
Cited
US3855550A
Cited
US4042934A
Cited
US4157549A
Cited
US4259743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |