Patent US2830243A successfully refreshed from Google Patents.
US4249263A
Expired / Lapsed
US
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Mixer circuit
Assignee: Hitachi Ltd
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Filing: 1979-11-02
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Granted: 1981-02-03
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Expires: 1999-11-02
Abstract
Abstract A mixer circuit formed of a micro strip line for converting an input signal in SHF band into an intermediate frequency signal in UHF band is disclosed which includes an arch-shaped half-wavelength line having a length equal to one half of the wavelength of the input signal and a series circuit of two diodes connected between both ends of the half-wavelength line, and in which the input signal and a local oscillation signal are applied respectively to the junction point of the diodes and one end of the half-wavelength line, and the intermediate frequency signal is delivered from a given point on the half-wavelength line.
Inventors
- 👤 Keiro Shinkawa
- 👤 Chuichi Sodeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:30
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03D2200/00; H03D2200/0001; H03D2200/0003; H03D2200/0023; H03D2200/0037; H03D2200/0041; H03D2200/009; H03D7/00; H03D7/14; H03D7/1408
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
258 words
A mixer circuit formed of a strip line and applied with first and second signals for delivering a third signal obtained by combining said first and second signals, wherein one of said three signals has a frequency lower than the frequencies of the other two signals, comprising: (a) a 1/2 wavelength line having a length nearly equal to one half of the wavelength of each of two signals out of said first, second and third signals, the remaining signal having the lowest frequency; (b) a series circuit of two diodes connected between both ends of said 1/2 wavelength line, said diodes being arranged with the same polarity; (c) first and second signal coupling means for coupling said two signals other than said lowest-frequency signal between a first connecting point and ground and between a second connecting point and ground, respectively, said first and second connecting points being defined respectively by the junction point of said diodes and one end of said 1/2 wavelength line; (d) third signal coupling means for coupling said lowest-frequency signal between said first connecting point and ground or between a third connecting point and ground, said third connecting point being defined by the middle point of said 1/2 wavelength line: and (e) means having a low impedance for said lowest-frequency signal, said means being connected between said first connecting point and ground or between said third connecting point and ground in accordance with said lowest-frequency signal being coupled between said third connecting point and ground or between said first connecting point and ground, respectively.
Claim 2
Dependent Claim
258 words
A mixer circuit formed of a strip line and applied with first and second signals for delivering a third signal obtained by combining said first and second signals, wherein one of said three signals has a frequency lower than the frequencies of the other two signals, comprising: (a) a 1/2 wavelength line having a length nearly equal to one half of the wavelength of each of two signals out of said first, second and third signals, the remaining signal having the lowest frequency; (b) a series circuit of two diodes connected between both ends of said 1/2 wavelength line, said diodes being arranged with the same polarity; (c) first and second signal coupling means for coupling said two signals other than said lowest-frequency signal between a first connecting point and ground and between a second connecting point and ground, respectively, said first and second connecting points being defined respectively by the junction point of said diodes and one end of said 1/2 wavelength line; (d) third signal coupling means for coupling said lowest-frequency signal between said first connecting point and ground or between a third connecting point and ground, said third connecting point being defined by the middle point of said 1/2 wavelength line: and (e) means having a low impedance for said lowest-frequency signal, said means being connected between said first connecting point and ground or between said third connecting point and ground in accordance with said lowest-frequency signal being coupled between said third connecting point and ground or between said first connecting point and ground, respectively.
Claim 3
Dependent Claim
109 words
A mixer circuit according to claim 1, wherein said 1/2 wavelength line is formed of a conductor having a length equal to one half of the wavelength of a high-frequency input signal in SHF band corresponding to said first signal; and wherein said first signal coupling means serve as signal inputting means for inputting said high-frequency input signal corresponding to said first signal, said second signal coupling means serve as signal inputting means for inputting a local oscillation signal in SHF band corresponding to said second signal, and said third signal coupling means serve as signal outputting means for outputting an intermediate-frequency output signal corresponding to said third signal.
Claim 4
Dependent Claim
45 words
A mixer circuit according to claim 2, wherein said first, second and third signal coupling means are connected to said first, second and third connecting points, respectively, and wherein means having a low impedance at an intermediate frequency are connected to said first connecting point.
Claim 5
Dependent Claim
45 words
A mixer circuit according to claim 2, wherein said first, second and third signal coupling means are connected to said second, first and third connecting points, respectively, and wherein means having a low impedance at an intermediate frequency are connected to said first connecting point.
Claim 6
Dependent Claim
45 words
A mixer circuit according to claim 2, wherein said first, second and third signal coupling means are connected to said first, second and third connecting points, respectively, and wherein means having a low impedance at an intermediate frequency are connected to said third connecting point.
Claim 7
Dependent Claim
103 words
A mixer circuit according to claim 1, wherein said 1/2 wavelength line is formed of a conductor having a length equal to one half of the wavelength of a high-frequency output signal corresponding to said third signal; and wherein said third signal coupling means serve as signal inputting means for inputting a high-frequency input signal corresponding to said first signal, said second signal coupling means serve as signal inputting means for inputting a local oscillation signal corresponding to said second signal, and said first signal coupling means serve as signal outputting means for outputting said high-frequency output signal corresponding to said third signal.
Claim 8
Dependent Claim
128 words
A mixer circuit according to claim 1, wherein said 1/2 wavelength line is formed of a conductor having a length equal to one half of the wavelength of a high-frequency output signal corresponding to said third signal, and wherein said third signal coupling means serve as signal inputting means for inputting a low-frequency input signal which corresponds to said first signal and is a modulating wave, said second signal coupling means serve as signal inputting means for inputting a high-frequency input signal which corresponds to said second signal and is subjected to modulation, and said first signal coupling means serve as signal outputting means for outputting said high-frequency output signal which corresponds to said third signal and is said high-frequency input signal modulated by said low-frequency input signal.
Claim 9
Dependent Claim
46 words
A mixer circuit according to claim 2, wherein a parallel-coupled band stop filter for attenuating a signal having an image frequency is coupled to at least one of said first, second and third signal coupling means and means having a low impedance at an intermediate frequency.
Claim 10
Dependent Claim
241 words
A mixer circuit formed of a strip line comprising: (a) a 1/2 wavelength line formed of a conductor having a length equal to one half of the wavelength of a high-frequency input signal; (b) a series circuit of two diodes connected between both ends of said 1/2 wavelength line, said diodes being arranged with the same polarity; (c) signal inputting means connected between ground and one of first and second connecting points for inputting said high-frequency input signal, said first and second connecting points being defined by the junction point of said diodes and one end of said 1/2 wavelength line, respectively; (d) signal inputting means connected between ground and the other of said first and second connecting points for inputting a local oscillation signal; (e) signal outputting means for outputting an intermediate-frequency output signal, said signal outputting means having an open-circuit impedance for said high-frequency input signal and said local oscillation signal and being connected between ground and one of said first connecting point and a third connecting point or a given point on a conductor connected to said one of said first and third connecting points, said third connecting point being defined by the middle point of said 1/2 wavelength line; and (f) means having a low impedance at an intermediate frequency and connected between ground and the other of said first and third connecting points or a given point on a conductor connected to said other connecting point.
Claim 11
Dependent Claim
241 words
A mixer circuit formed of a strip line comprising: (a) a 1/2 wavelength line formed of a conductor having a length equal to one half of the wavelength of a high-frequency input signal; (b) a series circuit of two diodes connected between both ends of said 1/2 wavelength line, said diodes being arranged with the same polarity; (c) signal inputting means connected between ground and one of first and second connecting points for inputting said high-frequency input signal, said first and second connecting points being defined by the junction point of said diodes and one end of said 1/2 wavelength line, respectively; (d) signal inputting means connected between ground and the other of said first and second connecting points for inputting a local oscillation signal; (e) signal outputting means for outputting an intermediate-frequency output signal, said signal outputting means having an open-circuit impedance for said high-frequency input signal and said local oscillation signal and being connected between ground and one of said first connecting point and a third connecting point or a given point on a conductor connected to said one of said first and third connecting points, said third connecting point being defined by the middle point of said 1/2 wavelength line; and (f) means having a low impedance at an intermediate frequency and connected between ground and the other of said first and third connecting points or a given point on a conductor connected to said other connecting point.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |