Patent US4876744A successfully refreshed from Google Patents.
US4876744A
Expired / Lapsed
US
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Mixer with rat race circuit
Assignee: Panasonic Holdings Corp
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Filing: 1988-01-15
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Granted: 1989-10-24
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Expires: 2008-01-15
Abstract
Abstract A mixer for outputting an intermediate frequency signal as the result of mixing of a radio frequency signal and a local oscillator signal which are inputted into the mixer. The mixer comprises a balanced-to-unbalanced conversion circuit and a bridge-coupled diode circuit and the balanced-to-unbalanced conversion circuit is constructed of first and second rat race circuits, one being for the radio frequencey signal and comprising a first ring-shaped line and the other being for the local oscillator signal and comprising a second ring-shaped line. The mixer is arranged to include a substrate having first and second pattern-forming surfaces and the first ring-shaped line of the first rat race circuit is formed as a pattern on the first pattern-forming surface of the substrate and the second ring-shaped line of the second rat race circuit is formed as a pattern on the second pattern-forming surface. The bridge-coupled diode circuit is positioned on the first pattern-forming surface thereof and inside the patterned first ring-shaped line.
Inventors
- 👤 Kouei Misaizu
- 👤 Mitsuo Makimoto
- 👤 Haruyoshi Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:11
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03D2200/00; H03D2200/0001; H03D2200/0003; H03D2200/0011; H03D2200/0013; H03D2200/0023; H03D7/00; H03D7/14; H03D7/1408
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
194 words
A mixer including a balanced-to-unbalanced conversion circuit and a bridge-coupled diode circuit, coupled to said balanced-to-unbalanced conversion circuit, for outputting an intermediate frequency signal as the result of mixing of a radio frequency signal and a local oscillator signal which are inputted into said mixer, said balanced-to-unbalanced conversion circuit being constructed of first and second rat race circuits, one being for said radio frequency signal and comprising a first ring-shaped conductive line and the other being for said local oscillator signal and comprising a second ring-shaped conductive line, said mixer comprising substrate means having first and second surfaces, said first ring-shaped conductive line of said first rat race circuit being formed as a pattern on said first surface of said substrate and said second ring-shaped conductive line of said second rat race circuit being formed as a pattern on said second surface, said bridge-coupled diode circuit comprising four diodes so as to mix said radio frequency signal and said local oscillator signal to produce a signal with a frequency between frequencies of the radio frequency signal and said local oscillator signal and being positioned within said first ring-shaped line on said first surface thereof.
Claim 2
Dependent Claim
194 words
A mixer including a balanced-to-unbalanced conversion circuit and a bridge-coupled diode circuit, coupled to said balanced-to-unbalanced conversion circuit, for outputting an intermediate frequency signal as the result of mixing of a radio frequency signal and a local oscillator signal which are inputted into said mixer, said balanced-to-unbalanced conversion circuit being constructed of first and second rat race circuits, one being for said radio frequency signal and comprising a first ring-shaped conductive line and the other being for said local oscillator signal and comprising a second ring-shaped conductive line, said mixer comprising substrate means having first and second surfaces, said first ring-shaped conductive line of said first rat race circuit being formed as a pattern on said first surface of said substrate and said second ring-shaped conductive line of said second rat race circuit being formed as a pattern on said second surface, said bridge-coupled diode circuit comprising four diodes so as to mix said radio frequency signal and said local oscillator signal to produce a signal with a frequency between frequencies of the radio frequency signal and said local oscillator signal and being positioned within said first ring-shaped line on said first surface thereof.
Claim 3
Dependent Claim
28 words
A mixer as claimed in claim 1, wherein said substrate has a conductor portion which is disposed between said first and second surfaces thereof and which is grounded.
Claim 4
Dependent Claim
34 words
A mixer as claimed in claim 1, wherein said substrate has at least two through-holes so that said first and second rat race circuits are coupled to each other by way of coupling means.
Claim 5
Dependent Claim
143 words
A mixer including a balanced-to-unbalanced conversion circuit for outputting an intermediate frequency signal as the result of mixing of a radio frequency signal and a local oscillator signal which are inputted into said mixer, said balanced-to-unbalanced conversion circuit being constructed of first and second rat race circuits, one being for said radio frequency signal and comprising a first ring-shaped line and the other being for said local oscillator signal and comprising a second ring-shaped line, each of said first and second rat race circuits having an isolation terminal which is placed at a predetermined angular position with respect to an input terminal thereof for said radio frequency signal or said local oscillator signal which is coupled through a resistor to a stub member to isolate the inputted radio frequency signal or the inputted local oscillator signal with respect to the radio frequency signal.
Claim 6
Dependent Claim
143 words
A mixer including a balanced-to-unbalanced conversion circuit for outputting an intermediate frequency signal as the result of mixing of a radio frequency signal and a local oscillator signal which are inputted into said mixer, said balanced-to-unbalanced conversion circuit being constructed of first and second rat race circuits, one being for said radio frequency signal and comprising a first ring-shaped line and the other being for said local oscillator signal and comprising a second ring-shaped line, each of said first and second rat race circuits having an isolation terminal which is placed at a predetermined angular position with respect to an input terminal thereof for said radio frequency signal or said local oscillator signal which is coupled through a resistor to a stub member to isolate the inputted radio frequency signal or the inputted local oscillator signal with respect to the radio frequency signal.
Claim 7
Dependent Claim
15 words
A mixer as claimed in claim 4, wherein said resistor has a value of 50Ω.
Claim 8
Dependent Claim
27 words
A mixer as claimed in claim 4, further including a bridge-coupled diode circuit and wherein said bridge-coupled diode circuit is positioned inside of said first ring-shaped line.
Claim 9
Dependent Claim
45 words
A mixer as claimed in claim 6, further including a substrate having first and second surfaces, and wherein said first ring-shaped line is formed as a pattern on said first surface and said second ringshaped line is formed as a pattern on said second surface.
Claim 10
Dependent Claim
27 words
A mixer as claimed in claim 7, wherein said substrate has a conductor portion positioned between said first and second pattern-forming surfaces, said conductor portion being grounded.
References Cited (Backward Citations)
US3629729A
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US4035732A
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US4032850A
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US4468784A
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US4627104A
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US4755775A
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |