US3963989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixer stage for microwave receivers
Assignee: INSTITUTET FOR MIKROVIGSTEKNIK
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Filing: 1974-04-18
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Granted: 1976-06-15
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Expires: 1994-04-18
Abstract
Abstract A mixture stage for microwave receivers for generating an intermediate frequency signal utilizes a diode including a forward biassed and reverse biassed junction in series placed in a microwave transmission line to which the received signal and the local oscillator signal are supplied.
Inventors
- 👤 Florian Sellberg
- 👤 Peter Weissglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:00
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0616; H03D7/00; H03D7/02; H03D7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
In a mixer for a microwave receiver and being responsive to a local oscillator signal and a received signal, the improvement comprising in combination: a pair of coupled waveguides respectively having said local oscillator signal and said received signal applied thereto; at least one barrier injection and transit time diode located in one of said pair of waveguides, said diode being operated in a non-oscillatory mode for mixing said local oscillator signal and said received signal to produce an intermediate frequency signal thereby; and means connected to said diode for coupling said intermediate frequency signal from said diode.
Claim 2
Dependent Claim
98 words
In a mixer for a microwave receiver and being responsive to a local oscillator signal and a received signal, the improvement comprising in combination: a pair of coupled waveguides respectively having said local oscillator signal and said received signal applied thereto; at least one barrier injection and transit time diode located in one of said pair of waveguides, said diode being operated in a non-oscillatory mode for mixing said local oscillator signal and said received signal to produce an intermediate frequency signal thereby; and means connected to said diode for coupling said intermediate frequency signal from said diode.
Claim 3
Dependent Claim
27 words
The mixer as defined by claim 1 wherein said at least one barrier injection and transit time diode comprises a single diode forming an unbalanced mixer thereby.
Claim 4
Dependent Claim
56 words
The mixer as defined by claim 2 and additionally including: bias voltage generating means adapted to produce a potential sufficient to cause said single diode to function with a negative resistance characteristic; and means applying said bias voltage to said single diode so that said negative resistance characteristic effects signal amplification of said intermediate frequency signal.
Claim 5
Dependent Claim
37 words
The mixer as defined by claim 1 and additionally including another barrier injection and transit time diode located in the other of said pair of waveguides and operated in a nonoscillatory mode to form a balanced mixer.
Claim 6
Dependent Claim
28 words
The mixer as defined by claim 4 wherein said at least one diode and said another diode are mounted in their respective waveguides in mutually opposite polarity senses.
Claim 7
Dependent Claim
56 words
The mixer as defined by claim 4 and additionally including: bias voltage generating means adapted to produce a potential sufficient to cause both said diodes to function with a negative resistance characteristic; and means applying said bias voltage to both said diodes so that said negative resistance characteristic effects signal amplification of said intermediate frequency signal.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |