US4186344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency converter
Assignee: Oki Electric Industry Co Ltd
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Filing: 1977-12-14
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Granted: 1980-01-29
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Expires: 1997-12-14
Abstract
Abstract In a transmitter and receiver system, a frequency converter doubles as a transmitter local oscillator, a receiver local oscillator, and a transmitter frequency converter. The present local oscillator is a semi-conductor oscillator such as a gunn diode or IMPAT diode, the DC power supply of which is converted to an intermediate frequency signal. The oscillator is stabilized by self injection locking by a cavity resonator connected to the output of the diode, thus the oscillating frequency is very stable. Some of the output power of the oscillator is separated for the receiving local oscillator through an isolator and an attenuator. The intermediate frequencies of a transmitter and receiver have a predetermined relationship.
Inventors
- 👤 Michio Higuchi
- 👤 Masayasu Hata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:18
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/50; H04B1/52; H04B1/525
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A frequency converter comprising a single diode oscillator, a DC power supply being superposed with the intermediate frequency signal, a cavity resonator connected to the output of the diode oscillator for providing self-injection-locking to the diode oscillator, means connected to the output of said resonator to extract both the local frequency for the receiver and a pair of side bands, means for transmitting one of said side bands, a mixer to receive the receiving signal and said local frequency to convert the receiving signal to the receiving intermediate frequency, and means for demodulating the receiving intermediate frequency to provide the receiving base band signal.
Claim 2
Dependent Claim
104 words
A frequency converter comprising a single diode oscillator, a DC power supply being superposed with the intermediate frequency signal, a cavity resonator connected to the output of the diode oscillator for providing self-injection-locking to the diode oscillator, means connected to the output of said resonator to extract both the local frequency for the receiver and a pair of side bands, means for transmitting one of said side bands, a mixer to receive the receiving signal and said local frequency to convert the receiving signal to the receiving intermediate frequency, and means for demodulating the receiving intermediate frequency to provide the receiving base band signal.
Claim 3
Dependent Claim
22 words
A frequency converter according to claim 1 in which said cavity resonator is directly connected to the output of the diode oscillator.
Claim 4
Dependent Claim
16 words
A frequency converter according to claim 2 in which said local oscillator comprises a gunn diode.
Claim 5
Dependent Claim
16 words
A frequency converter according to claim 2 in which said local oscillator comprises an IMPAT diode.
Claim 6
Dependent Claim
47 words
A frequency converter according to claim 2, wherein said means connected to the output of said resonator to extract both the local frequency for the receiver and a pair of side bands comprises a circulator for separating a local frequency from the transmission signal for said mixer.
Claim 7
Dependent Claim
18 words
A frequency converter according to claim 3, wherein an attenuator is provided between said circulator and the mixer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |