US3713041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection type frequency locked oscillator apparatus
Assignee: NEC Corp
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Filing: 1971-12-14
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Granted: 1973-01-23
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Expires: 1991-12-14
Abstract
Abstract An injection-type frequency-locked oscillator provided with novel means for monitoring the operation of the oscillator. An injection input wave is applied through a directional coupler to an auxiliary terminal of the oscillator having a separate output terminal connected to a load. The coupler separates the injection input wave from the oscillator output wave. The output impedance of the oscillator is matched to the load impedance; however, the input impedance of the oscillator at the auxiliary terminal is mismatched to the output impedance of the coupler with respect to the injection input wave, thereby producing in the coupler a reflected injection input wave which is 180* out of phase with the oscillator output wave when the oscillator is frequencylocked at the center frequency of the injection input wave. The signal level at a monitoring terminal of the coupler provides a monitoring signal indicative of the degree of frequency-locking of the oscillator.
Inventors
- 👤 K Sakamoto
- 👤 R Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:35
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1805
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
An injection-type frequency-locked oscillator apparatus comprising: a. an input terminal for receiving an injection input wave; b. an oscillator to be frequency-locked to the frequency of the injection input wave and having: 1. a load output terminal for connection to a load, and 2. an auxiliary output terminal; c. directional coupling means coupled between said input terminal and said auxiliary terminal for supplying the injection input wave to said oscillator through said auxiliary terminal; d. a monitoring terminal on said directional coupling means; and wherein: e. the output impedance of said oscillator is matched to the impedance of the load, and the input impedance of said oscillator at said auxiliary terminal is mismatched to the output impedance of said directional coupling means with respect to the injection input wave; whereby an oscillation output wave and a reflected input injection wave are produced in said directional coupling means, so that the signal level at said monitoring terminal is indicative of the degree of frequency-locking of said oscillator.
Claim 2
Dependent Claim
166 words
An injection-type frequency-locked oscillator apparatus comprising: a. an input terminal for receiving an injection input wave; b. an oscillator to be frequency-locked to the frequency of the injection input wave and having: 1. a load output terminal for connection to a load, and 2. an auxiliary output terminal; c. directional coupling means coupled between said input terminal and said auxiliary terminal for supplying the injection input wave to said oscillator through said auxiliary terminal; d. a monitoring terminal on said directional coupling means; and wherein: e. the output impedance of said oscillator is matched to the impedance of the load, and the input impedance of said oscillator at said auxiliary terminal is mismatched to the output impedance of said directional coupling means with respect to the injection input wave; whereby an oscillation output wave and a reflected input injection wave are produced in said directional coupling means, so that the signal level at said monitoring terminal is indicative of the degree of frequency-locking of said oscillator.
Claim 3
Dependent Claim
33 words
Apparatus as defined in claim 1 further comprising means coupled to the output of said oscillator for matching the oscillator output impedance to the impedance of a load connected to the oscillator output.
Claim 4
Dependent Claim
122 words
an auxiliary output terminal; c. directional coupling means coupled between said input terminal and said auxiliary terminal for supplying the injection input wave to said oscillator through said auxiliary terminal; d. a monitoring terminal on said directional coupling means; and wherein: e. the output impedance of said oscillator is matched to the impedance of the load, and the input impedance of said oscillator at said auxiliary terminal is mismatched to the output impedance of said directional coupling means with respect to the injection input wave; whereby an oscillation output wave and a reflected input injection wave are produced in said directional coupling means, so that the signal level at said monitoring terminal is indicative of the degree of frequency-locking of said oscillator.
Claim 5
Dependent Claim
122 words
an auxiliary output terminal; c. directional coupling means coupled between said input terminal and said auxiliary terminal for supplying the injection input wave to said oscillator through said auxiliary terminal; d. a monitoring terminal on said directional coupling means; and wherein: e. the output impedance of said oscillator is matched to the impedance of the load, and the input impedance of said oscillator at said auxiliary terminal is mismatched to the output impedance of said directional coupling means with respect to the injection input wave; whereby an oscillation output wave and a reflected input injection wave are produced in said directional coupling means, so that the signal level at said monitoring terminal is indicative of the degree of frequency-locking of said oscillator.
Claim 6
Dependent Claim
35 words
Apparatus as defined in claim 1 further comprising circuit means connected to said auxiliary terminal of said oscillator for mismatching said input impedance of said oscillator with said output impedance of said directional coupling means.
Claim 7
Dependent Claim
44 words
Apparatus as defined in claim 3 wherein said circuit means comprises means for selecting the mismatch, so that the reflection co-efficient of the reflected injection input wave is substantially close to a real number between 0 and -1 and has a negligible imaginary component.
Claim 8
Dependent Claim
21 words
Apparatus as defined in claim 1 wherein said oscillator comprises a transistor oscillator circuit capable of operating in the UHF band.
Claim 9
Dependent Claim
21 words
Apparatus as defined in claim 1 wherein said oscillator comprises a Gunn diode oscillator capable of operating in the SHF band.
Claim 10
Dependent Claim
14 words
Apparatus as defined in claim 1 wherein said directional coupling means comprises a circulator.
Claim 11
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein said directional coupling means comprises a directional coupler.
References Cited (Backward Citations)
US3304518A
Cited
US3588735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |