Patent US4457022A successfully refreshed from Google Patents.
US4457022A
Expired / Lapsed
US
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Two diode image rejection and pseudo-image enhancement mixer
Assignee: Motorola Solutions Inc
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Filing: 1982-04-28
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Granted: 1984-06-26
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Expires: 2002-04-28
Abstract
Abstract An image rejection and pseudo-image enhancement mixer wherein mixer diodes are coupled to a signal source through a power divider without resistor, to a local oscillator through directional filters and to mixer outputs through a quadrature coupler. A 90° phase shifter coupled between one diode and the power divider without resistor provides for phase cancellation of the pseudo-image signal, while the image signal is terminated at one output port and the desired signal is obtained at another output port of the quadrature coupler.
Inventors
- 👤 Michael Dydyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:22
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/16; H03D7/165; H03D7/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A mixer comprising: a modified power divider having an input suitable for application of an RF signal having a first output and having a second output; a phase shifter coupled to said first output of said modified power divider; a first directional filter coupled to said phase shifter; a second directional filter coupled to said second output of said modified power divider; means for dividing the power of a local oscillator signal coupled to said first directional filter and coupled to said second directional filter; a first diode coupled to said first directional filter; a second diode coupled to said second directional filter; and a quadrature coupler coupled to said first diode and coupled to said second diode, said quadrature coupler having an output suitable for supplying a signal.
Claim 2
Dependent Claim
129 words
A mixer comprising: a modified power divider having an input suitable for application of an RF signal having a first output and having a second output; a phase shifter coupled to said first output of said modified power divider; a first directional filter coupled to said phase shifter; a second directional filter coupled to said second output of said modified power divider; means for dividing the power of a local oscillator signal coupled to said first directional filter and coupled to said second directional filter; a first diode coupled to said first directional filter; a second diode coupled to said second directional filter; and a quadrature coupler coupled to said first diode and coupled to said second diode, said quadrature coupler having an output suitable for supplying a signal.
Claim 3
Dependent Claim
43 words
The mixer as recited in claim 1 wherein said means for dividing the power of a signal comprises a Wilkinson power divider having a first output coupled to said first directional filter and having a second output coupled to said second directional filter.
Claim 4
Dependent Claim
43 words
The mixer as recited in claim 1 wherein said means for dividing the power of a signal comprises a modified power divider having a first output coupled to said first directional filter and having a second output coupled to said second directional filter.
Claim 5
Dependent Claim
61 words
The mixer as recited in claim 1 wherein said means for dividing the power of a signal comprises: a quadrature coupler having a first output coupled to said first directional filter and having a second output; and a phase shifter coupled to said second output of said quadrature coupler, said phase shifter having an output coupled to said second directional filter.
Claim 6
Dependent Claim
25 words
The mixer as recited in claim 1 wherein said mixer further comprises: an equalizing network coupled between said first directional filter and said first diode.
Claim 7
Dependent Claim
25 words
The mixer as recited in claim 1 wherein said mixer further comprises: an equalizing network coupled between said second directional filter and said second diode.
Claim 8
Dependent Claim
39 words
The mixer as recited in claim 1 wherein said mixer further comprises: an equalizing network coupled between said first directional filter and said first diode; and an equalizing network coupled between said second directional filter and said second diode.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |