US3955198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar RF generator including a stable local oscillator and an exciter circuit
Assignee: Texas Instruments Inc
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Filing: 1973-12-26
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Granted: 1976-05-04
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Expires: 1993-12-26
Abstract
Abstract The specification discloses a RF generator for use in a radar system. The generator includes an oscillator having a crystal for generating a predetermined VHF signal. A multiplier multiplies the VHF signal to a desired RF signal. Amplifying circuitry amplifies the RF signal and applies a signal to a first isolator. A filter is connected to the output of the first isolator and includes plural cavaties for filtering all but a selected narrow bandwidth signal from the RF signal. A power divider divides the narrow bandwidth signal to provide a stable local oscillator signal and an exciter signal. A second isolator is connected to receive the exciter signal and a high pass filter is connected to the output of the isolator. A coherent oscillator generates a stable coherent oscillator signal and a transmit switch is provided to gate the coherent oscillator signal in response to a radar timing signal. A mixer mixes the gated coherent oscillator signal with the filtered exciter signal. A bandpass filter passes a selected one of the upper and lower side bands of the output from the mixer. An exciter amplifier is connected to amplify the output of the bandpass filter and to apply the signal through a third isolator to the radar system.
Inventors
- 👤 Dennis Richard Delzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:19
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
209 words
A RF generator for a radar system comprising: an oscillator including a crystal for generating a predetermined VHF signal, a multiplier for multiplying said VHF signal to a desired RF signal, amplifying circuitry for amplifying said RF signal, a first isolator for preventing passage of signals to the output of said amplifying circuitry while allowing passage of said RF signal, a filter connected to the output of said first isolator including plural cavities for filtering all but a selected narrow bandwidth signal from said RF signal, a power divider for dividing said narrow bandwidth signal to provide a stable local oscillator signal and an exciter signal, a second isolator connected to pass said exciter signal, a high pass filter for filtering said exciter signal, a coherent oscillator for generating a stable coherent oscillator signal, a transmit switch for gating said coherent oscillator signal in response to a radar timing signal, a mixer for mixing the gated coherent oscillator signal with the filtered exciter signal, a bandpass filter for passing a selected one of the upper and lower side bands of the output from said mixer, an exciter amplifier for amplifying the output of said bandpass filter, and a third isolator connected to pass the output of said exciter amplifier.
Claim 2
Dependent Claim
209 words
A RF generator for a radar system comprising: an oscillator including a crystal for generating a predetermined VHF signal, a multiplier for multiplying said VHF signal to a desired RF signal, amplifying circuitry for amplifying said RF signal, a first isolator for preventing passage of signals to the output of said amplifying circuitry while allowing passage of said RF signal, a filter connected to the output of said first isolator including plural cavities for filtering all but a selected narrow bandwidth signal from said RF signal, a power divider for dividing said narrow bandwidth signal to provide a stable local oscillator signal and an exciter signal, a second isolator connected to pass said exciter signal, a high pass filter for filtering said exciter signal, a coherent oscillator for generating a stable coherent oscillator signal, a transmit switch for gating said coherent oscillator signal in response to a radar timing signal, a mixer for mixing the gated coherent oscillator signal with the filtered exciter signal, a bandpass filter for passing a selected one of the upper and lower side bands of the output from said mixer, an exciter amplifier for amplifying the output of said bandpass filter, and a third isolator connected to pass the output of said exciter amplifier.
Claim 3
Dependent Claim
26 words
The RF generator of claim 1 and further comprising: means for sensing operation of said multiplier, and meter means for displaying the operation of said multiplier.
Claim 4
Dependent Claim
28 words
The RF generator of claim 1 and further comprising means for tuning said multiplier to multiply said VHF signal to any one of a plurality of RF signals.
Claim 5
Dependent Claim
17 words
The RF generator of claim 1 wherein said filter includes means for adjusting the selected narrow bandwidth.
Claim 6
Dependent Claim
19 words
The RF generator of claim 1 wherein said power divider comprises a resistive network having a pair of outputs.
Claim 7
Dependent Claim
28 words
The RF generator of claim 1 and further comprising: means for detecting said stable local oscillator signal, and meter means for displaying an indication of said oscillator signal.
Claim 8
Dependent Claim
19 words
The RF generator of claim 1 wherein said transmit switch includes back-to-back diodes for gating said coherent oscillator signal.
Claim 9
Dependent Claim
79 words
The RF generator of claim 1 and further comprising: a sourse of a continuous wave signal, a switch connected to the source of the radar timing signal and said transmit switch and operable to disconnect the radar timing signal and to connect said source of the continuous wave signal to said transmit switch, wherein the continuous wave signal enables alignment of the radar exciter, and means for sensing the application of the continuous wave signal to said transmit switch.
Claim 10
Dependent Claim
181 words
An RF generator for generating a predetermined RF signal comprising: an oscillator including a removable crystal for generating a preselected VHF signal, a multiplier coupled to the oscillator output for multiplying said VHF signal to a desired RF signal, a power amplifier coupled to the multiplier for enhancing the strength of the desired RF signal, said power amplifier including a tuning means for fine tuning the desired RF signal, a tunable bandpass filter for selecting a desired bandpass signal from said RF signal and attenuating the nonselected signal, a power divider coupled to the tunable bandpass filter for dividing the selected bandpass signal into a plurality of selected signals including a signal for an exciter, and an exciter coupled to the power divider for producing exciter signals, said exciter including a coherent oscillator for generating a coherent signal, means coupled to the coherent oscillator and power divider for selectively mixing the coherent oscillator signal with the signal of the power divider for the exciter, and means for passing a selected side band of the mixed RF signals as an exciter signal.
Claim 11
Dependent Claim
181 words
An RF generator for generating a predetermined RF signal comprising: an oscillator including a removable crystal for generating a preselected VHF signal, a multiplier coupled to the oscillator output for multiplying said VHF signal to a desired RF signal, a power amplifier coupled to the multiplier for enhancing the strength of the desired RF signal, said power amplifier including a tuning means for fine tuning the desired RF signal, a tunable bandpass filter for selecting a desired bandpass signal from said RF signal and attenuating the nonselected signal, a power divider coupled to the tunable bandpass filter for dividing the selected bandpass signal into a plurality of selected signals including a signal for an exciter, and an exciter coupled to the power divider for producing exciter signals, said exciter including a coherent oscillator for generating a coherent signal, means coupled to the coherent oscillator and power divider for selectively mixing the coherent oscillator signal with the signal of the power divider for the exciter, and means for passing a selected side band of the mixed RF signals as an exciter signal.
Claim 12
Dependent Claim
73 words
An RF generator according to claim 9 wherein the means coupled to the coherent oscillator and power divider for selectively mixing the coherent oscillator signal with the signal of the power divider for the exciter includes a gating switch coupled to the coherent oscillator for gating said coherent oscillator signal in response to a timing signal, and a doubly balanced mixer for mixing the gated coherent oscillator signal with the filtered RF signal.
Claim 13
Dependent Claim
48 words
An RF generator according to claim 9 wherein the means for passing a selected side band of the mixed RF signals as an exciter signal includes a tunable bandpass filter for passing a selected one of the upper or lower side bands of the output from said mixer.
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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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |